Precision Linear Shafts - One End Male Thread One End Female Thread Type with Undercut
Caution
Product Description
[Features] One end male thread, one end female thread, shaft with relief groove (linear shaft, hardened shaft, guide shaft, slide shaft). L size standard expanded! You can now purchase from an even more complete lineup.
Precision Linear Shafts, One End Male Thread, One End Female Thread, with Undercut
Linear shafts (hardened, guide and slide shafts) with a male thread with relief groove at one end and a female thread at the other end. Available in bearing steel, stainless steel and S45C with induction hardening and hard chrome or low-temperature black chrome plating options.
- L and F dimensional tolerances conform to JIS B0405 class m.
- D surface roughness differs between plated and non-plated items.
Material, surface treatment and hardness
- Surface roughness of part D differs between plated and unplated items.
- Tolerances of dimensions L and F conform to JIS B 0405 m class.
| Type | Material | Hardness | Surface treatment | ||
|---|---|---|---|---|---|
| D tolerance g6 | D tolerance h5 | D tolerance f8 | |||
| SAFD | SFDU | - | SUJ2 equivalent | Induction hardened (effective hardened depth: see table) SUJ2 equivalent 58HRC min. SUS440C or 13Cr stainless steel 56HRC min. | - |
| SSAFD | SSFDU | - | SUS440C or 13Cr stainless steel | ||
| PSAFD | PSFDU | - | SUJ2 equivalent | Hard chrome plating Plating hardness HV750 min. Plating thickness 5 μm min. | |
| PSSAFD | PSSFDU | - | SUS440C or 13Cr stainless steel | ||
| RSAFD | - | - | SUJ2 equivalent | Low-temperature black chrome plating | |
| RSSAFD | - | - | SUS440C or 13Cr stainless steel | ||
| - | - | PSAGD | S45C equivalent | - | Hard chrome plating Plating hardness HV750 min. Plating thickness 10 μm min. |
| - | - | PSSAGD | SUS304 | ||
- Low-temperature black chrome plated SUS440C or 13Cr stainless steel items have an identification groove.
- Hard chrome plated items are machined after plating, so machined areas are not plated.
Part numbers and dimensions
Ordering example
| Type | - | L | - | F | - | M | - | N |
|---|---|---|---|---|---|---|---|---|
| SAFD20 | - | 277 | - | F25 | - | M10 | - | N12 |
| D tolerance | |||
|---|---|---|---|
| D | g6 | h5 | f8 |
| 8 | -0.005 -0.014 | 0 -0.006 | -0.013 -0.035 |
| 10 | |||
| 12 | -0.006 -0.017 | 0 -0.008 | -0.016 -0.043 |
| 13 | |||
| 15 | |||
| 16 | |||
| 18 | |||
| 20 | -0.007 -0.020 | 0 -0.009 | -0.020 -0.053 |
| 25 | |||
| 30 | |||
| 35 | -0.009 -0.025 | 0 -0.011 | -0.025 -0.064 |
| 40 | |||
| 50 | |||
| Type | 1 mm increments | M (coarse) Selection | N (coarse) Selection | (Y) Max. | C | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | D | L | F | |||||||||||||||||||||||
| D tolerance g6 | D tolerance h5 | 8 | 25–1095 | 5≤F≤M×3 F-g≥Pitch×3 | 5 | 6 | 3 | 4 | 5 | 1100 | 0.5 or less | |||||||||||||||
| SAFD SSAFD PSAFD PSSAFD RSAFD RSSAFD D tolerance f8 PSAGD PSSAGD | SFDU SSFDU PSFDU PSSFDU | 10 | 25–1195 | 5 | 6 | 8 | 3 | 4 | 5 | 6 | 1200 | |||||||||||||||
| 12 | 25–1395 | 5 | 6 | 8 | 10 | (3) | 4 | 5 | 6 | 8 | 1400 | |||||||||||||||
| 13 | 25–1395 | 5 | 6 | 8 | 10 | 12 | (3) | 4 | 5 | 6 | 8 | 1400 | ||||||||||||||
| 15 | 25–1395 | 5 | 6 | 8 | 10 | 12 | (3) | 4 | 5 | 6 | 8 | 10 | 1400 | |||||||||||||
| 16 | 25–1395 | 5 | 6 | 8 | 10 | 12 | 4 | 5 | 6 | 8 | 10 | 1400 | ||||||||||||||
| 18 | 25–1395 | 5 | 6 | 8 | 10 | 12 | 16 | 4 | 5 | 6 | 8 | 10 | 12 | 1400 | ||||||||||||
| 20 | 25–1395 | 5 | 6 | 8 | 10 | 12 | 16 | 4 | 5 | 6 | 8 | 10 | 12 | 1400 | 1.0 or less | |||||||||||
| 25 | 25–1395 | 5 | 6 | 8 | 10 | 12 | 16 | 20 | 24 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 1400 | |||||||||
| 30 | 25–1495 | 6 | 8 | 10 | 12 | 16 | 20 | 24 | 6 | 8 | 10 | 12 | 16 | 20 | 1500 | |||||||||||
| 35 | 25–1492 | 10 | 12 | 16 | 20 | 24 | 30 | 8 | 10 | 12 | 16 | 20 | 24 | 1500 | ||||||||||||
| 40 | 40–1490 | 12 | 16 | 20 | 24 | 30 | 10 | 12 | 16 | 20 | 24 | 30 | 1500 | |||||||||||||
| Low-temperature black chrome plated items: D ≤ 30, Y ≤ 1000. | 50 | 50–1490 | 16 | 20 | 24 | 30 | 12 | 16 | 20 | 24 | 30 | 1500 | ||||||||||||||
- Dimension N ( ) can be selected only with D tolerance g6.
- Overall length L must satisfy N×2.5+4 ≤ L.
| Coarse thread relief dimensions | |||
|---|---|---|---|
| M | Pitch | MC | (g) |
| 5 | 0.8 | 4.1 | 2 |
| 6 | 1.0 | 4.4 | |
| 8 | 1.25 | 6.0 | 3 |
| 10 | 1.5 | 7.7 | |
| 12 | 1.75 | 9.4 | 4 |
| 16 | 2.0 | 13.0 | |
| 20 | 2.5 | 16.4 | 5 |
| 24 | 3.0 | 19.6 | |
| 30 | 3.5 | 25.0 | |
Male thread C chamfer details
| Nominal thread M | Pitch P | Chamfer C (reference) |
|---|---|---|
| 3 | 0.50 | 0.50 |
| 4 | 0.70 | 0.75 |
| 5 | 0.80 | 0.75 |
| 6 | 1.00 | 1.00 |
| 8 | 1.25 | 1.25 |
| 10 | 1.50 | 1.50 |
| 12 | 1.75 | 1.75 |
| 16 | 2.00 | 2.00 |
| 20 | 2.50 | 2.50 |
| 24 | 3.00 | 3.00 |
| 30 | 3.50 | 3.50 |
Alterations
Alterations are available. Refer to the alteration table for applicable codes, dimensional limits and conditions.
For details, please see the PDF catalog.
Technical reference
Straightness measurement
Support both shaft ends on V-blocks, rotate the shaft once and measure the dial gauge amplitude at any point.
Straightness is 1/2 of the measured amplitude.
Roundness M
Shafts with O.D. g6, h5 (hardened)
| D | Roundness M | |
|---|---|---|
| Over | Up to | |
| 7 | 13 | 0.004 |
| 13 | 20 | 0.005 |
| 20 | 40 | 0.006 |
| 40 | 50 | 0.007 |
Unit: mm
Shafts with O.D. f8 (not hardened)
| D | Roundness M | |
|---|---|---|
| Over | Up to | |
| 7 | 10 | 0.011 |
| 10 | 18 | 0.014 |
| 18 | 30 | 0.017 |
| 30 | 50 | 0.020 |
Straightness K
| D | L | Straightness K |
|---|---|---|
| 8–50 | L≤100 | 0.01 or less |
| L>100 | (L/100)×0.01 or less |
| L | Straightness K |
|---|---|
| L≤100 | 0.025 or less |
| L>100 | (L/100)×0.025 or less |
L dimension tolerance
| L | L dimension tolerance | |
|---|---|---|
| Over | Up to | |
| 24 | 30 | ±0.2 |
| 30 | 120 | ±0.3 |
| 120 | 400 | ±0.5 |
| 400 | 1000 | ±0.8 |
| 1000 | 1500 | ±1.2 |
Hardness reduction at machined areas
- Machining is done after hardening, but annealing for machining may reduce hardness.
- *Hardness after reduction: approx. 10–40HRC
Hardness reduction range
- Approx. 10 mm from the machined area
(Example)
Areas with hardness reduced by annealing
- Male thread
• Wrench flats
• Flats
• 90° flats
Hardness reduction at female threads: the conditions depend on material and selection.
SUS440C or 13Cr stainless steel: hardness is reduced at the female thread.
SUJ2 equivalent: under the conditions below, hardness is reduced at the female thread.
- When M ≥ D/2
• RC threads
• 2-hole female thread type
Effective hardened depth: depends on outer dimensions and material.
| O.D. D | Effective hardened depth | |
|---|---|---|
| SUJ2 equivalent | SUS440C / 13Cr stainless steel | |
| 8, 10 | 0.5 or more | 0.5 or more |
| 12, 13 | 0.7 or more | |
| 15–20 | 0.7 or more | |
| 25–50 | 1.0 or more | |
Hard chrome plating on machined areas: hard chrome plated items are machined after plating, so machined areas are not plated.
In the example below, only the "///" area is hard chrome plated.
Example: plating remains on a stepped male-thread shaft with an added flat
Shafts vs. rotary shafts
- Specification comparison: linear shafts and rotary shafts
Basic specifications
| Specifications | Shaft | Rotary shaft | ||
|---|---|---|---|---|
| Material | SUJ2 equivalent SUS440C or 13Cr stainless steel | S45C equivalent SUS304 | S45C equivalent SUS304 | SCM435 |
| Hardening | Induction hardening | - | - | Hardness 30–35HRC |
| 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 (full-length treatment type) | Hard chrome plating | No plating Black oxide Electroless nickel plating | Black oxide Electroless nickel plating |
- *With hard chrome plating, no plating remains on machined areas.
Overview and technical notes
- Shaft end machined area (effective thread length + approx. 10 mm)