About Shafts
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Step-Down Rotary Shafts
A shoulder near the end of the shaft provides a stop for gears, sprockets, and bearings. The edges are chamfered to remove sharp corners, reducing damage to bearings, housings, and other components during installation. All are turned, ground, and polished to tight diameter and straightness tolerances.
1045 carbon steel shafts balance high strength and good machinability, making them ideal for general purpose use. They are stronger than aluminum and stainless steel shafts but not as corrosion resistant. 303 stainless steel shafts are more corrosion resistant than steel shafts but also more difficult to machine.
Step | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Lg. Tolerance | Dia. | Lg. | Straightness Tolerance | Edge Type | Hardness Rating | Hardness | Each | |
Inch—1045 Carbon Steel | |||||||||
3/4" Dia. (Tolerance: -0.001" to 0") | |||||||||
| 6" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 000000 | 000000 |
| 9" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 000000 | 00000 |
| 12" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 000000 | 00000 |
1" Dia. (Tolerance: -0.001" to 0") | |||||||||
| 6" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 000000 | 00000 |
| 9" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 000000 | 00000 |
| 12" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 000000 | 00000 |
Inch—303 Stainless Steel | |||||||||
3/4" Dia. (Tolerance: -0.001" to 0") | |||||||||
| 6" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 160 | 0000000 | 00000 |
| 9" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 160 | 0000000 | 00000 |
| 12" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 160 | 0000000 | 00000 |
1" Dia. (Tolerance: -0.001" to 0") | |||||||||
| 6" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 160 | 0000000 | 00000 |
| 9" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 160 | 0000000 | 00000 |
| 12" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 160 | 0000000 | 00000 |
Step | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Lg. Tolerance | Dia. | Lg. | Straightness Tolerance | Edge Type | Hardness Rating | Hardness | Each | |
Inch—1045 Carbon Steel | |||||||||
3/4" Dia. (Tolerance: -0.001" to 0") | |||||||||
| 12" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 000000 |
| 18" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
| 24" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
1" Dia. (Tolerance: -0.001" to 0") | |||||||||
| 12" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
| 12" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
| 18" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
| 18" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
| 24" | -0.005" to 0.005" | 1/2" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
| 24" | -0.005" to 0.005" | 3/4" | 3" | 0.003" per ft. | Chamfered | Medium | Brinell 150 | 0000000 | 00000 |
Ball Splines and Bearings
Create a compact linear and rotary motion system for applications requiring complex, fast movements, such as robotics. The grooves on the ball splines transmit rotary power as ball bearings move smoothly and precisely along their length, even at high speeds.
Ball splines are alloy steel for high strength and wear resistance. They're hardened on the outside for additional wear resistance while the center is soft enough to absorb stress from shifting loads. Those with a step-down end have a shoulder near the end to stop gears, sprockets, and bearings.
Bearings have a retaining ring groove, so they can be positioned in your system with a retaining ring (not included). Bearings with a keyway include a machine key for attaching your load. Flanged bearings have a surface with mounting holes for attaching your load.
Spline | Step | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dia., mm | Dia. Tolerance, mm | Lg., mm | Lg. Tolerance, mm | Lg., mm | No. of | Root Dia., mm | Dia., mm | Dia. Tolerance, mm | Lg., mm | Surface Smoothness, microinch | Edge Type | Hardness Rating | Hardness | Heat Treatment | Each | |
Metric—52100 Alloy Steel | ||||||||||||||||
Splined End × Step-Down End | ||||||||||||||||
| 18.2 | -0.021 to 0 | 350 | -0.7874 to 0.7874 | 200 | 4 | 16.4 | 15 | -0.018 to 0 | 150 | 16 | Chamfered | Very Hard | Rockwell C60 | Case Hardened | 00000000 | 0000000 |
| 23 | -0.021 to 0 | 350 | -0.7874 to 0.7874 | 200 | 4 | 20.6 | 20 | -0.021 to 0 | 150 | 16 | Chamfered | Very Hard | Rockwell C60 | Case Hardened | 00000000 | 000000 |
| 28 | -0.021 to 0 | 450 | -0.7874 to 0.7874 | 300 | 4 | 24.8 | 25 | -0.021 to 0 | 150 | 16 | Chamfered | Very Hard | Rockwell C60 | Case Hardened | 00000000 | 000000 |
| 37.4 | -0.025 to 0 | 550 | -0.7874 to 0.7874 | 400 | 4 | 33.1 | 30 | -0.021 to 0 | 150 | 16 | Chamfered | Very Hard | Rockwell C60 | Case Hardened | 00000000 | 000000 |
Material | Keyway | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Spline Dia., mm | For No. of Splines | Overall Lg., mm | OD, mm | Bearing | Ball | Dynamic Load Cap., lbs. | Max. Dynamic Torque, in.-lbs. | With Retaining Ring Grooves | Includes | Dp., mm | Lg., mm | Wd., mm | Each | |
| 18.2 | 4 | 60 | 32 | Steel | Steel | 1,750 | 734 | Yes | Machine Key | 2.5 | 26 | 4 | 00000000 | 0000000 |
| 28 | 4 | 80 | 45 | Steel | Steel | 4,150 | 2,557 | Yes | Machine Key | 4 | 41 | 7 | 00000000 | 000000 |
Material | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Spline Dia., mm | For No. of Splines | Overall Lg., mm | Flange OD, mm | OD, mm | Bearing | Ball | Dynamic Load Cap., lbs. | Max. Dynamic Torque, in.-lbs. | With Retaining Ring Grooves | Number of Mounting Holes | Each | |
| 18.2 | 4 | 60 | 51 | 32 | Steel | Steel | 1,750 | 734 | Yes | 4 | 00000000 | 0000000 |
| 23 | 4 | 70 | 60 | 37 | Steel | Steel | 2,750 | 1,433 | Yes | 4 | 00000000 | 000000 |
| 28 | 4 | 80 | 70 | 45 | Steel | Steel | 4,150 | 2,557 | Yes | 4 | 00000000 | 000000 |
| 37.4 | 4 | 100 | 90 | 60 | Steel | Steel | 6,900 | 5,637 | Yes | 4 | 00000000 | 000000 |