20mm Axles | McMaster-Carr

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42 Products

About Shafts

Combine these general purpose drive shafts with gears, sprockets, and bearings to transmit rotary motion. All are turned, precision ground, and polished to meet tight diameter and straightness tolerances. This means these shafts evenly distribute loads, reduce vibration, and improve accuracy and stability.

Steel shafts are generally stronger than stainless steel shafts but not as corrosion resistant. Carbon steel shafts balance high strength and good machinability, making them ideal for general purpose use. Alloy steel shafts are good for high-stress applications. They are stronger than carbon steel and hardened for increased wear resistance; however, they are more difficult to machine.

Stainless steel shafts are more corrosion resistant than steel shafts but more difficult to machine. 303 stainless steel shafts have good corrosion resistance and are easier to machine than other types of stainless steel.

Shafts with chamfered edges reduce damage to bearings, housings, and other components during installation.

Metric—1566 Carbon Steel
Lg.	Lg. Tolerance	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
20mm Dia. (Tolerance: -0.076mm to 0mm)
200mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	000000
400mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	00000
500mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	00000
1,000mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	00000
1,200mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	00000
1,500mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	00000
2,000mm	-0.795mm to 0.795mm	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C25	0000000	00000
Metric—4140 Alloy Steel
20mm Dia. (Tolerance: -0.025mm to 0mm)
152mm	0" to 0.005"	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C28	0000000	00000
305mm	0" to 0.005"	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C28	0000000	00000
914mm	0" to 0.005"	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C28	0000000	00000
1,829mm	0" to 0.005"	0.3 mm per 300 mm	Chamfered	Hard	Rockwell C28	0000000	000000
Metric—303 Stainless Steel
20mm Dia. (Tolerance: -0.01mm to 0mm)
100mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	00000
200mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	00000
400mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000
600mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000
800mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000
1,000mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000

Flange-Mount Idler Rotary Shafts

Mount the flange to a machine or wall to support idler sprockets and pulleys in tensioning applications. They include washers and a nut to position your component and hold it in place.

		Overall		Thread					Mounting Holes
Dia.	Lg.	Lg.	Dia.	Size	Pitch	Lg.	Flange Thick.	Bolt Circle Dia.	No. of	Dia.	Edge Type	Hardness Rating	Hardness		Each
Metric—Zinc-Plated 1215 Carbon Steel
20mm	15mm	46mm	50mm	M18	2.5 mm	16.56mm	11mm	36mm	4	6mm	Straight	Medium	Rockwell B84	0000000	000000

Thread-Mount Idler Rotary Shafts

With Retaining Ring Groove

Thread these shafts into a tapped hole to support idler sprockets and pulleys in tensioning applications.

Shafts with retaining ring grooves come with a retaining ring and spacers to position your component and hold it in place.

		Overall		Thread			Groove
Dia.	Lg.	Lg.	Dia.	Size	Pitch	Lg.	Wd.	Dia.	End-to-Groove Lg.	Edge Type	Hardness Rating	Hardness		Each
Metric with Retaining Ring Grooves—Zinc-Plated 1215 Carbon Steel
20mm	15mm	45mm	31mm	M12	1.75 mm	16mm	1.422mm	14.73mm	4.06mm	Chamfered	Medium	Rockwell B84	0000000	000000

Keyed Rotary Shafts

Combine these shafts with a machine key (not included) to transmit torque to gears, sprockets, and other power transmission components. All have an ANSI standard keyway (keys not included; see our selection of key stock). Their edges are chamfered to remove sharp corners, reducing damage to bearings, housings, and other components during installation. All are turned, ground, or polished to tight diameter and straightness tolerances.

Steel shafts are generally stronger than aluminum and stainless steel shafts but not as corrosion resistant. 1045 carbon steel shafts balance high strength and good machinability, making them ideal for general purpose use.

Stainless steel shafts are more corrosion resistant than steel shafts but also more difficult to machine. 304 stainless steel shafts have good corrosion resistance.

	Keyway
Lg.	Lg.	Wd.	Dp.	ANSI Keys Included	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
Metric—1045 Carbon Steel
20mm Dia. (Tolerance: -0.0635mm to 0mm)
300mm	300mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	000000
500mm	500mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	00000
1,000mm	1,000mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	000000
1,200mm	1,200mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	000000
1,500mm	1,500mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	000000
1,800mm	1,800mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	0000000	000000
Metric—304 Stainless Steel
20mm Dia. (Tolerance: -0.0635mm to 0mm)
200mm	200mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	00000
400mm	400mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	00000
1,000mm	1,000mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	000000
2,000mm	2,000mm	6mm	3.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	000000

D-Profile Rotary Shafts

A flat surface area allows set screws to dig into the shaft for securely mounting 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.

Metric—1045 Carbon Steel
Lg.	Lg. Tolerance	Flat Wd.	D-Profile Lg.	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
20mm Dia. (Tolerance: -0.05mm to 0mm)
200mm	-1.57mm to 1.57mm	10mm	200 mm	0.33 mm per 300 mm	Chamfered	Medium	Brinell 197	00000000	000000
400mm	-1.57mm to 1.57mm	10mm	400 mm	0.33 mm per 300 mm	Chamfered	Medium	Brinell 197	00000000	00000
1,200mm	-1.57mm to 1.57mm	10mm	1,200 mm	0.33 mm per 300 mm	Chamfered	Medium	Brinell 197	00000000	00000

Splined Rotary Shafts

Good for hydraulic systems, machine tools, and other high-torque applications, these shafts have teeth that transmit high rotational loads. Compared to keyed shafts, they last longer and handle higher torque. They’re also better than keyed shafts for applications requiring frequent disassembly or adjustments because you can move bushings along their splines.

Parallel splines have large, straight-sided teeth that resemble machine keys and transmit more torque than involute spline teeth. These splines are known as straight splines.

Bushings act as a surface to transmit rotary motion or to position a load along the length of the shaft. If welded into place, these bushings can act as a coupler, connecting two splined shafts. Flanged bushings have a surface with mounting holes for you to attach your load.

Parallel Spline on Both Ends

Sleeve Bushing for Parallel Spline

Shafts										Flanged Bushings		Sleeve Bushings
Dia.	Spline Lg.	No. of Splines	Lg.	Edge Type	Hardness Rating	Hardness	Specifications Met		Each		Each		Each
Metric—1045 Carbon Steel
20mm	1,000mm	6	1,000mm	Chamfered	Not Rated	Not Rated	DIN 5463-B, ISO 14-B	000000000	0000000	000000000	0000000	000000000	0000000

Undersized Rotary Shafts

The diameter of these shafts is slightly smaller than listed, so precision ball bearings (ABEC-3 and above) slide on without any tools. This saves you from having to use a bearing heater or mechanical press, which can cause damage. These rotary shafts are also known as drive shafts because they’re frequently used with a motor to drive power transmission applications. All are turned, ground, and polished to tight diameter and straightness tolerances. This allows them to evenly distribute loads, reduce vibration, and improve accuracy and stability. They’re stainless steel, so they resist corrosion. All have chamfered edges to remove sharp corners, reducing damage to bearings, housings, and other components during installation.

Metric—303 Stainless Steel
Lg.	Lg. Tolerance	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
20mm Dia. (Tolerance: -0.01mm to -0.005mm)
200mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000
400mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000
600mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000
1,000mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000

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.

Bearings have a retaining ring groove, so they can be positioned in your system with a retaining ring (not included). Flanged bearings have a surface with mounting holes for attaching your load.

Ball Splines

Splined on Both Ends

Four Splines

				Spline
Dia., mm	Dia. Tolerance, mm	Lg., mm	Lg. Tolerance, mm	Lg., mm	No. of	Root Dia., mm	Surface Smoothness, microinch	Edge Type	Hardness Rating	Hardness	Heat Treatment		Each
Metric—52100 Alloy Steel
Splined on Both Ends
20	-0.02 to 0	200	-0.05 to 0.05	200	4	17.9	16	Chamfered	Very Hard	Rockwell C60	Case Hardened	000000000	0000000
20	-0.02 to 0	2,000	-0.08 to 0.08	2,000	4	17.9	16	Chamfered	Very Hard	Rockwell C60	Case Hardened	000000000	000000

Flanged Bearings

					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
20	4	63	58	35	Steel	Steel	2,000	929	Yes	4	000000000	0000000