Linear shafts / one-sided, two-sided internal thread
- Order quantities extended (D-JIT)
(i)Remark
- SFAT has been localized according to European needs and requirements. Please have a look on the EU version SFATEU. SFATEU is available in EN 1.1213 (Cf53) and h6.
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- Drawing / Specifications
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Dimensional Drawing
[ ! ]For plated products, the surface roughness of D part is
; and for unplated products, it is 
.[ ! ] L dimension tolerance conforms to JIS B 0405 Class m.
| Type | D Tol. | [M] Material | [H] Hardness | [S]Surface Treatment | |
| One End Tapped | Both Ends Tapped | ||||
| SFAT | SFAW | g6 | EN 1.3505 Equiv. | Induction Hardened EN 1.3505 Equiv. 58HRC~ EN 1.4125 Equiv. 56HRC~ | — |
| SSFAT | SSFAW | EN 1.4125 Equiv. | |||
| RSFAT | RSFAW | EN 1.3505 Equiv. | Low Temperature Black Chrome Plating | ||
Specification Table
| Part Number | — | L | — | M | — | N |
| SFAT20 SFAW15 SF−SSFAT20 | — — — | 80 100 50 | — — — | M6 M6 M8 | — | N10 |
| D Tol. | |
| 6 | −0.004 −0.012 |
| 8 | −0.005 −0.014 |
| 10 | |
| 12 | −0.006 −0.017 |
| 13 | |
| 15 | |
| 16 | |
| 18 | |
| 20 | −0.007 −0.020 |
| Part Number | L 1 mm Increments | M (Coarse), N (Coarse) Selection | C | ||||||||
| Type | D | ||||||||||
| One End Tapped SFAT SSFAT RSFAT | Both Ends Tapped SFAW SSFAW RSFAW | 6 | 20 to 150 | 3 | 0.5 or Less | ||||||
| 8 | 20 to 150 | 3 | 4 | 5 | |||||||
| 10 | 20 to 150 | 3 | 4 | 5 | 6 | ||||||
| 12 | 20 to 150 | 4 | 5 | 6 | 8 | ||||||
| 13 | 25 to 150 | 4 | 5 | 6 | 8 | ||||||
| 15 | 25 to 150 | 4 | 5 | 6 | 8 | 10 | |||||
| 16 | 30 to 150 | 4 | 5 | 6 | 8 | 10 | |||||
| 18 | 30 to 150 | 4 | 5 | 6 | 8 | 10 | 12 | ||||
| 20 | 30 to 150 | 4 | 5 | 6 | 8 | 10 | 12 | 1.0 or less | |||
[ ! ] When M x 2.5 + 4 + N x 2.5 + 4 ≥ L, tap pilot holes may go through and the effective length of the smaller tap part may be shortened.
Alteration Details
* When selecting multiple alterations, the distance between machined areas should be 2 mm or more.
* Alteration may lower hardness.
| Alteration Code | Alteration Details | Fixed Dimension | Applicable Conditions | Ordering Example | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LKC | Precisely change L dimension and tolerance | ·L < 150→L±0.03 | [ ! ]L Dimension can be specified in 0.1 mm increments | SSFAW16-120.5-M8-N10-LKC | ||||||||||||||||||||||||||||||
| MD ND | Changes the effective length of tapped part to M(N) × 3 | — | [ ! ] Applicable to D = 10 to 30 and M (N) = 6 to 20 [!] One End Tapped: MD × 3.5+4 ≤ L [!] Both Ends Tapped: MD × 3.5+4+ND × 3.5+4 ≤ L [NG] Not available in combination with MSC, NSC | SSFAW16-120-MD8-ND10 | ||||||||||||||||||||||||||||||
| MSC NSC | Change Tapped Thread to Fine Thread |
| [ ! ] Applicable to D = 12 or more [NG] (N) dimensions are equal to MSC (NSC). [NG] Not available in combination with MD, ND | SSFAW16-120-MSC8-NSC10 | ||||||||||||||||||||||||||||||
Circularity (M), Straightness (K), L Dimension Tolerance, Perpendicularity
measure shaft runout using a dial indicator.
1/2 of measured runout is defined as the straightness.
Shaft Outer Dia. g6 (Hardening)
| D | Circularity M | |
|---|---|---|
| Over | or Less | |
| 6 | 13 | 0.004 |
| 13 | 20 | 0.005 |
Shaft Outer Dia. g6 (Hardening)
| D | L | Straightness K | |
|---|---|---|---|
| 6 to 20 | L ≤ 100 | 0.01 or Less | |
| L > 100 | (L/100) × 0.01 or Less | ||
Shaft Outer Dia. g6 (Hardening)
| L | L Dimension Tolerance | |
|---|---|---|
| Over | or Less | |
| 19 | 30 | ±0.2 |
| 30 | 120 | ±0.3 |
| 120 | 150 | ±0.5 |
■ Perpendicularity
Notes on Surface Treating
■About hard chrome plating and plating layer of processed part
- Hard chrome plating is applied after surface treatment of the base material, so there is no plating on the processed parts.
- In the example below, only "///" area is treated with hard chrome plating.
/// Part: Plating Remains
Difference Between Shaft and Rotary Shaft
■ Basic Specifications
| Specifications | Shafts | Rotary Shaft | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Material | EN 1.3505 Equiv. EN 1.4125 Equiv. | EN 1.1191 Equiv. EN 1.4301 Equiv. | EN 1.1191 Equiv. EN 1.4301 Equiv. | EN 1.7220 Equiv. | ||||||
| Hardening | Induction Hardened | — | — | Hardness: 30 to 35 HRC | ||||||
| O.D. Tolerance | g6/h5 | f8 | g6/h9/h7 | g6 | ||||||
| Surface Treatment | No Plating Hard Chrome Plating Low Temperature Black Chrome Plating Electroless Nickel Plating (Surface Treatment Fully Plated Type) | Hard Chrome Plating | No Plating Black Oxide Electroless Nickel Plating | Black Oxide Electroless Nickel Plating | ||||||
* Hard chrome plating leaves no plating layer on the machined part.
■ Alteration
| Alterations | Shafts | Rotary Shaft | |||||
|---|---|---|---|---|---|---|---|
| L Dimension Tolerance | L < 200⇒L±0.03 200 ≤ L < 500⇒L±0.05 L ≥ 500⇒L±0.1 | L < 500⇒L±0.05 L ≥ 500⇒L±0.1 Not applicable when L ≥ 800 | |||||
| Wrench Flats | Can be specified up to 2 Locations | Can be specified up to 1 Location | |||||
| Set Screw Flat | Can be specified up to 2 Locations | Can be specified up to 3 Locations | |||||
| 2 Set Screw Flats | Can be specified up to 2 Locations Angle Specified: Fixed | Can be specified up to 1 Location Angle Specified: Configurable in 15 degree Increments | |||||
| V Groove | Can be specified up to 2 Locations | — | |||||
| Keyway | Can be specified up to 2 Locations Processing of Stepped Part: Not Possible | Can be specified up to 4 Locations Processing of Stepped Part: Possible | |||||
| Undercut | M6 to M30 | M3 to M30 | |||||
| Tapped Depth | Possible | Possible | |||||
| Retaining Ring Groove | Can be specified 2 Locations (It will be a retaining ring type instead of alterations) | 2 locations on D part, 1 location each on stepped part can be combined | |||||
| Slit Cam Groove | — | Can be specified up to 1 Location | |||||
| Concentricity | — | Possible | |||||
| Left-hand Thread / Thread | — | Possible | |||||
| Slit Added | — | Can be specified up to 1 Location | |||||
| C Chamfering Width | — | Possible | |||||
Part Number:
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| Part Number |
Standard Unit Price
| Minimum order quantity | Volume Discount | RoHS | Shaft end Shape (Right) | [D] Diameter (Shaft) (mm) | [L] Length (Shaft) (mm) | Material | Surface Treatment | Hardness | [MSC] Size (fine thread - depth 2xMSC) (mm) | [NSC] Size (fine thread - depth 2xN) (mm) | [MD] Size (thread - depth 3xM) | [ND] Size (thread - depth 3xN) | [N] Size (thread - depth 2xN) (mm) | [M] Size (thread - depth 2xM) (mm) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
- | 1 | 12 Days | 10 | Straight | 6 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 3 | ||
- | 1 | 12 Days | 10 | Straight | 8 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 3 ～ 5 | ||
- | 1 | 12 Days | 10 | Straight | 10 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 3 ～ 6 | ||
- | 1 | 12 Days | 10 | Straight | 10 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Straight | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 8 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | - | - | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Straight | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 8 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | - | - | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Straight | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 10 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 10 | - | - | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Straight | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 10 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 10 | - | - | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 18 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 4 ～ 12 | ||
- | 1 | 12 Days | 10 | Straight | 18 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 12 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 18 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 12 | - | - | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 20 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | - | 4 ～ 12 | ||
- | 1 | 12 Days | 10 | Straight | 20 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 12 | - | - | - | ||
- | 1 | 12 Days | 10 | Straight | 20 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 14 | - | - | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 6 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 3 | 3 | ||
- | 1 | 12 Days | 10 | Internal thread | 8 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 3 ～ 5 | 3 ～ 5 | ||
- | 1 | 12 Days | 10 | Internal thread | 10 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 3 ～ 6 | 3 ～ 6 | ||
- | 1 | 12 Days | 10 | Internal thread | 10 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | 6 | - | 3 ～ 6 | ||
- | 1 | 12 Days | 10 | Internal thread | 10 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 | - | 3 ～ 6 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 10 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 | 6 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 4 ～ 8 | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | 6 ～ 8 | - | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 | - | - | - | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 8 | - | 4 ～ 8 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 8 | 6 ～ 8 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 | 6 ～ 8 | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | - | - | - | 4 ～ 8 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | - | - | 6 ～ 8 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 12 | 20 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | 8 | - | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 4 ～ 8 | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | 6 ～ 8 | - | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 | - | - | - | 4 ～ 8 | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 8 | - | 4 ～ 8 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 8 | 6 ～ 8 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 | 6 ～ 8 | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | - | - | - | 4 ～ 8 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | - | - | 6 ～ 8 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 13 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 | 8 | - | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 4 ～ 10 | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | 6 ～ 10 | - | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 ～ 10 | - | - | - | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 10 | - | 4 ～ 10 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 10 | 6 ～ 10 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 ～ 10 | 6 ～ 10 | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 10 | - | - | - | 4 ～ 10 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 10 | - | - | 6 ～ 10 | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 15 | 25 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | 8 ～ 10 | 8 ～ 10 | - | - | - | - | ||
- | 1 | 12 Days | 10 | Internal thread | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | - | 4 ～ 10 | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Internal thread | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | - | 6 ～ 10 | - | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Internal thread | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | 8 ～ 10 | - | - | - | 4 ～ 10 | ||
- | 1 | 12 Days | 10 | Internal thread | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 10 | - | 4 ～ 10 | - | ||
- | 1 | 12 Days | 10 | Internal thread | 16 | 30 ～ 150 | [Alloyed Steel] EN 1.3505 Equiv. | LTBC Plating | Induction Hardening (58HRC~) | - | - | 6 ～ 10 | 6 ～ 10 | - | - |
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Specifications/Overview
Low temp. black chrome plating applied to shafts has highly anti-rusting effect with thin black film (1µ to 2µ thickness).
Additionally, the coating is resistant to cracking and exfoliation from extreme and repeated bending.
Shaft O.D. tolerance remains g6 after low temp. black chrome plating is applied. Works well with linear bushings and suitable for places where rusting is to be avoided.
In addition, low temperature black chrome plated bushings are suitable for places where reflection of light is undesirable.
Shaft after Sliding Test
Alterations See each product page for details.
Sliding Test Conditions Linear Bushing: LMUR12
Shafts: RSFJ12
50km sliding test was conducted on Linear Bushings under 412N load.
| Material | Corresponding Shaft Diameter | Applicable Overall Length |
| EN 1.3505 Equiv. | ⌀3 to ⌀30 | Up to 500 |
| Material | Corresponding Shaft Diameter | Applicable Overall Length |
| EN 1.3505 Equiv. | ⌀6 to ⌀20 | Up to 150 |
High Precision Linear Shafts
| Material | Corresponding Shaft Diameter | Applicable Overall Length |
| EN 1.3505 Equiv. | ⌀4 to ⌀30 | Up to 448 |
| EN 1.4125 Equiv. |
It will change over time in about a month or more, and the color will not fade easily.
(Note 2) Tapped threads will not be coated with Low Temp. Black Chrome Plating.
(Note 3) Low temp. black chrome plated shafts may have centering holes on the ends for surface treatment.
App. Example
Surface Limits / Hardness - Linear Shafts
Limits of hardness and hardening depth
The linear shafts are processed after the base material has undergone inductive hardening. Therefore, the processed surfaces may result in a deviating hardness.
In the following example, you can view the affected areas of the linear shaft, which may be affected after processing by e.g. threads, level surfaces, key surfaces and transverse bores.
_(450x164).jpg)
Cause for deviating hardness
The raw material of the linear shaft is treated via thermal induction before grinding. Thus, a configured linear shaft can be custom-made not only cost-effectively, but also with short delivery times. The linear shaft is hardened at the boundary layer (boundary layer hardening) of the liner shaft. The depth of the hardened boundary layer depends on the material used and the diameter of the linear shaft. The following table shows the hardening depth of linear shafts.
Coatings and plating are applied to the raw material after hardening and grinding. For more information, see Coatings of the Linear Shaft.
.jpg)
Figure of boundary layer hardening: hardened boundary layer in light gray
Effective hardening depth of linear shafts
| Outside diameter (D) | Effective hardening depth | |||
| EN 1.1191 equiv. | EN 1.3505 equiv. | EN 1.4125 equiv. | EN 1.4301 equiv. | |
| 3 | - | +0.5 | +0.5 | Without induction hardening |
| 4 | - | |||
| 5 | - | |||
| 6 - 10 | +0.3 | |||
| 12 - 13 | +0.5 | +0.7 | +0.5 | |
| 15 - 20 | +0.7 | |||
| 25 - 50 | +0.8 | +1 | ||
Overview of the effective hardening depth as PDF
Coatings of the linear shaft
The surface coating is applied to the raw material before machining the linear shaft. Thanks to their coating, the usable surface or work surface of the linear shaft is not only protected against corrosion but also against wear.
Machined positions of the linear shafts, such as plane surfaces or threads, may be uncoated, as they are added afterwards. This can lead to the machined surfaces being corroded in a linear shaft made of steel. If the linear shaft is used in a corrosive environment, it is recommended to use a stainless steel linear shaft.
The following figure shows the areas of the linear shaft that are coated (crosshatched).
_(321x64).jpg)
Figure: Coating of linear shafts
You can find further information on surface treatment and hardness in this PDF .
General Information - Linear Shafts
Linear Shaft Selection Details
- Material: steel, stainless steel
- Coating/plating: uncoated, hard chrome plated, LTBC coated, chemically nickel-plated
- Heat treatment: untreated, inductively hardened
- ISO tolerances: h5, k5, g6, h6, h7, f8
- Precision classes: perpendicularity 0.03, concentricity (with thread and increments) Ø0.02, perpendicularity 0.20, concentricity (thread and stepper) Ø0.10
- Linearity/roundness: depends on diameter, here for the PDF
Description / basics of the linear shaft
Linear shafts are steel shafts that perform guiding tasks in combination with linear bearings, such as plain bearing bushings or linear ball bushings. Linear shaft holding functions can be adopted from shaft holders or linear ball bearing adapters. Most linear shafts are heat-treated (induction hardened) solid shafts. A special design of linear shafts is the hollow shaft, which is also called tubular shaft. Inductively hardened linear shafts have a high surface hardness and a tough core. The achievable surface hardness is approx. 55-58 HRC (see information on hardening depth). Linear shafts made of stainless steels can generally not be hardened. Therefore, these steel shafts should be chrome plated to protect them from wear.
Materials
Linear shafts are mainly hardened steel shafts. In addition to the selected heat treatment, the steel used in particular imparts its properties to the linear shaft, although it is a hollow shaft or a solid shaft. Therefore, special aspects such as hardness, corrosion and wear must be considered when selecting the shaft steel.
Coatings
To protect linear shafts from corrosion, the surface can be chemically nickel-plated. As an alternative to chemical nickel-plating, steel shafts can also be coated with LTBC. The LTBC coating is an anti-corrosive surface coating and it is a low-reflection coating, made of a 5 μm thick film of fluoropolymer, which in essence is a black film. In addition, the LTBC coating is resistant to bursting pressure by extreme or repeated bending. LTBC-coated linear shafts are thus particularly suitable for locations where corrosion or light reflections are undesirable. Linear shafts that require particularly high surface hardness and wear resistance can be hard chrome plated.
Function
The form and function of linear shafts differ from linear guiderails. Linear guiderails are square rails that work in combination with carriers (rotary elements, carriages) according to the rolling or sliding principle. Linear shafts on the other hand are precision-ground round steel shafts that take on a linear guide function in conjunction with linear ball bushings or plain bearing bushings (maintenance-free bushings).
Areas of Application
Linear shafts are intended for axial motion. Whether horizontal or vertical linear motion, all linear motions can be implemented with linear shafts. Common applications are stroke mechanisms and other applications with high demands on smoothness, precision and service life. Linear shafts can therefore be used in almost all industries of plant construction and mechanical engineering. Linear shafts are often found in 3D printers, metering equipment, measuring devices, positioning devices, alignment devices, bending devices and sorting equipment.
Instructions for Use / Installation - Linear Shafts
For product selection, please observe the linear shaft tolerances (e.g. h5, k5, g6, h6, h7, f8) in conjunction with the diameter tolerance of the plain bearing bushing (sliding bearing) after pressing in or the running circle diameter of the linear ball bearing (ball bushing).
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Adjusting rings/clamping rings
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Basic information
| Basic Shape | Solid | Shaft end Shape (Left) | Internal thread | Shaft end Perpendicularity | 0.2 |
|---|---|---|---|---|---|
| Heat Treatment | Induction Hardened | ISO Tolerance | g6 |
Configure
Basic Attributes
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Shaft end Shape (Right)
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Straight -
Internal thread
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[D] Diameter (Shaft)(mm)
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[L] Length (Shaft)(mm)
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Material
- Alloyed Steel
- Stainless Steel (martensitique)
- Alloyed Steel
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Surface Treatment
- No Treatment
- LTBC Plating
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Hardness
- Induction Hardening (56HRC~)
- Induction Hardening (58HRC~)
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[MSC] Size (fine thread - depth 2xMSC)(mm)
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[NSC] Size (fine thread - depth 2xN)(mm)
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[MD] Size (thread - depth 3xM)
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[ND] Size (thread - depth 3xN)
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[N] Size (thread - depth 2xN)(mm)
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[M] Size (thread - depth 2xM)(mm)
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Type
- RSFAT
- RSFAW
- SFAT
- SFAW
- SSFAT
- SSFAW
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Filter by CAD data type
- 2D
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Filter by standard shipping days
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Optional Attributes
- The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .
Frequently Asked Questions (FAQ)
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Question:
What is the difference between a hollow shaft and a solid shaft?
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Answer:
With the same size, there are three differences between a hollow shaft and a solid shaft. Hollow shafts weigh less. The inner cavity of a hollow shaft is suitable for use as a channel (cable channel). Solid shafts are a bit more rigid (higher resistance torque).
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Question:
What is the minimum order of linear shafts from MISUMI?
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Answer:
MISUMI supplies solid shafts, hollow shafts and precision shafts starting at a lot size of 1. This also applies to all other items in our product range.
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Question:
Noises and vibrations occur with a linear shaft. In addition, there are jerky movements. What could cause this?
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Answer:
In general, it may be caused if the steel shaft is not properly lubricated. In addition, an incorrectly selected diameter tolerance of the linear shafts may also make the cycle of motion more difficult. When using MISUMI linear ball bearings, a g6 shaft tolerance is recommended (tolerance recommendations may vary depending on the manufacturer).
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Question:
What is the strength of a solid shaft?
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Answer:
The strength of a linear shaft, although it is a solid shaft, hollow shaft or precision shaft, should always be selected in consideration of the strength of the material used.
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Question:
What are the advantages of a hollow shaft over a solid shaft?
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Answer:
There are various advantages of a hollow shaft compared to a solid shaft. If the outer diameter is the same, the weight of a hollow shaft is lower than that of a solid shaft. However, the cavity of the hollow shaft can also be used as a cable channel or for cooling. A hollow shaft is at the same weight or with the same cross-sectional area more rigid than a solid shaft, because the outer diameter is larger. However, the question that needs to be answered is whether the advantage is a greater room utilization or less weight.
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Question:
Is a hollow shaft stiffer than a solid shaft?
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Answer:
The rigidity of a hollow shaft is slightly lower with the same outer diameter than that of a solid shaft. However, with the same cross-sectional area or with the same weight, the stiffness of a hollow shaft is higher than that of a solid shaft, because the outer diameter of the hollow shaft is larger.
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Question:
Why do I have running grooves on the linear shafts of my 3D printers?
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Answer:
The running grooves on the linear shaft may have been created, for example, by using a linear ball bearing. To prevent grooves from forming on a steel shaft, it should be hardened and hard chromium plated, making it more durable and resistant to the wear and tear from ball bearings.
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Question:
How do the flexure properties of hollow shafts and solid shafts differ?
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Answer:
With an equally large outer diameter, a solid shaft has better flexure properties than an equally large hollow shaft. However, the solid shaft is not much stiffer than a hollow shaft with the same outer diameter, since the outer sections mainly carry the load. Hollow shafts with the same cross-sectional area are more rigid than solid shafts, because they have a larger outer diameter. Therefore, there is physically more material in the outer sections for the bending, which bears the loads.
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Question:
I need a lacquered or matted shaft because reflections cause problems with the optics. Does MISUMI have something like that?
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Answer:
MISUMI LTBC-coated linear shafts are an alternative to painted or matted steel shafts. The LTBC coating is low-reflection and has the same effect as painted and matte shafts. In addition, LTBC-coated linear shafts are more resistant to wear and tear and flaking. You can find further information on LTBC coating here .
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Question:
It has been shown that a hollow shaft is stronger than a solid shaft made of the same material. Why?
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Answer:
A hollow shaft with the same outer dimensions is principally not stronger than a solid shaft. However, a hollow shaft per weight unit is stronger.
Complementary Products
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Plain Bearing Bushes / Flange Selectable / with Housing / Number of Bushes Selectable / Seal Selectable
MISUMI Standard Price : 13.73 € Shipping Days: Same day
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Set collars / stainless steel, steel / wedge clamping / double cross hole, cross thread
MISUMI Standard Price : 5.60 € Shipping Days: Same day
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Linear ball bearings / wide block shape / aluminium / anodised / single double bush
MISUMI Standard Price : 17.08 € Shipping Days: Same day
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Linear Ball Bearings / Stainless Steel, Steel / Chrome-, Nickel-Plated / Double Ring Groove
MISUMI Standard Price : 3.45 € Shipping Days: Same day
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