20mm Axles | McMaster-Carr

Filter by

System of Measurement

Length

End Type

Retaining Ring Groove

Material

For Motion

Mechanical Finish

Edge Type

Thread Size

Keyway Width

Shaft Type

Hardness Rating

REACH

Groove Width

Thread Length

Hardness

Finish

Overall Diameter

Groove Diameter

Thread Pitch

Keyway Length

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

1C999

EAR99

DFARS Specialty Metals

Keyway Depth

RoHS

39 Products

Rotary Shafts

Pair with gears, sprockets, and bearings to transmit rotary motion. Turned, ground, and polished to tight tolerances, these shafts reduce vibration, evenly distribute loads, and improve accuracy.

Carbon Steel—Strong and easy to machine. These shafts work best in dry environments since moisture will cause steel to rust.

High-Strength Alloy Steel—Our strongest steel shafts. However, they're more difficult to machine than carbon steel shafts.

Corrosion-Resistant 303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These shafts are easier to machine than other stainless steel shafts.

				Material
	Lg., mm	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Carbon Steel







				20 mm Diameter

				200	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K34	000000


				400	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K35	00000
				500	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K36	00000
				1,000	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K37	00000
				1,200	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K38	00000
				1,500	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K39	00000
				2,000	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K41	00000


				High-Strength Alloy Steel







								20 mm Diameter

								152	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N51	00000


								305	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N52	00000
								914	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N53	00000
								1,829	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N54	000000


								Corrosion-Resistant 303 Stainless Steel







												20 mm Diameter

												100	0.18 mm/300 mm	-0.01 mm to 0 mm	Rockwell B83	Medium	4143N44	00000


												200	0.18 mm/300 mm	-0.01 mm to 0 mm	Rockwell B83	Medium	4143N45	00000
												400	0.18 mm/300 mm	-0.01 mm to 0 mm	Rockwell B83	Medium	4143N46	000000
												600	0.18 mm/300 mm	-0.01 mm to 0 mm	Rockwell B83	Medium	4143N47	000000
												800	0.18 mm/300 mm	-0.01 mm to 0 mm	Rockwell B83	Medium	4143N48	000000
												1,000	0.18 mm/300 mm	-0.01 mm to 0 mm	Rockwell B83	Medium	4143N49	000000

Thread-Mount Idler Rotary Shafts


Retaining-Ring-Grooves End	Retaining-Ring-Grooves End

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

Retaining-Ring-Grooves End—Shafts with retaining ring grooves come with a retaining ring and spacers to position your component and hold it in place.

			Overall, mm		Thread		Groove, mm
	Dia., mm	Lg., mm	Lg.	Dia.	Size	Lg., mm	Wd.	Dia.	End-to-Groove Lg., mm	Edge Type	Hardness Rating	Hardness		Each
Retaining-Ring-Grooves End—Zinc-Plated 1215 Carbon Steel



		20	15	45	31	M12 × 1.75 mm	16	1.422	14.73	4.06	Chamfered	Medium	Rockwell B84	2435K38	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, mm		Thread				Mounting Holes
	Dia., mm	Lg., mm	Lg.	Dia.	Size	Lg., mm	Flange Thk., mm	Bolt Circle Dia., mm	No. of	Dia., mm	Edge Type	Hardness Rating	Hardness		Each
Threaded End—Zinc-Plated 1215 Carbon Steel



		20	15	46	50	M18 × 2.5 mm	16.56	11	36	4	6	Straight	Medium	Rockwell B84	2435K34	000000

Keyed Rotary Shafts

Match with a machine key to prevent slipping while transmitting torque to gears and other components. Turned, ground, and polished to tight tolerances, these shafts reduce vibration, evenly distribute loads, and improve accuracy.

Fully Keyed

Mount components anywhere along the length of these shafts. For secure torque transmission, slide a component from either end and lock it into place with an ANSI machine key (sold separately).

Carbon Steel—Strong and easy to machine. These shafts work best in dry environments since moisture will cause steel to rust.

Corrosion-Resistant 304 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. However, these shafts are more difficult to machine than carbon steel shafts.

		Keyway						Material
	Lg., mm	Lg.	Wd.	Dp.	ANSI Keys Included	Straightness Tolerance	Dia. Tolerance, mm	Hardness	Hardness Rating		Each
Carbon Steel







				20 mm Diameter

				300	300 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K611	000000


				500	500 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K621	00000
				1,000	1,000 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K631	000000
				1,200	1,200 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K641	000000
				1,500	1,500 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K651	000000
				1,800	1,800 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K15	000000


				Corrosion-Resistant 304 Stainless Steel







								20 mm Diameter

								200	200 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K219	00000


								400	400 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K221	00000
								1,000	1,000 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K222	000000
								2,000	2,000 mm	6 mm	3.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K223	000000

Undersized Rotary Shafts

Slide precision ball bearings (ABEC-3 and above) onto these shafts. The diameter is slightly smaller than listed, so you don't need to use a bearing heater or mechanical press, which can cause damage. Turned, ground, and polished to tight tolerances, these shafts reduce vibration, evenly distribute loads, and improve accuracy.

Corrosion-Resistant 303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These shafts are easier to machine than other stainless steel shafts.

				Material
	Lg., mm	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Corrosion-Resistant 303 Stainless Steel







				20 mm Diameter

				200	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N37	000000


				400	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N38	000000
				600	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N39	000000
				1,000	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N41	000000

Splined Rotary Shafts

Often used in hydraulic and other high-torque applications, these shafts have evenly spaced teeth to transmit heavy rotational loads. They handle more torque and last longer than keyed shafts since they have multiple contact points. Pair them with splined sleeve bushings (sold separately). Compatible bushings and components slide right along the splines, making these shafts a good choice for frequent disassembly and adjustments.

Fully Parallel Splined

The large, straight-sided teeth resemble machine keys and transmit more torque than involute-spline teeth. These shafts are fully splined, so you can mount components anywhere along their length.

Carbon Steel—Strong and easy to machine. These shafts work best in dry environments since moisture will cause steel to rust.

Sleeve Bushings—Transmit rotary motion or position loads along a shaft. These bushings also work as couplers—they can join two splined shafts when welded into place.

Flanged Sleeve Bushings—The flange has mounting holes for attaching your load.

	Shafts							Sleeve Bushings		Flanged Sleeve Bushings
				Material
	Dia., mm	Lg., mm	No. of Splines	Hardness	Hardness Rating		Each		Each		Each
Carbon Steel



		20	1,000	6	Not Rated	Not Rated	61145K404	0000000	61145K157	0000000	61145K337	0000000

D-Profile Rotary Shafts

Lock gears, sprockets, and bearings in place so they won't slip as these shafts turn. The flat length mates with D-shaped bores for a secure connection while giving set screws an even surface to dig into. Turned, ground, and polished to tight tolerances, these shafts reduce vibration, evenly distribute loads, and improve accuracy.

Carbon Steel—Strong and easy to machine. These shafts work best in dry environments since moisture will cause steel to rust.

					Material
	Lg., mm	Flat Wd., mm	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Carbon Steel







				20 mm Diameter

				200	10	0.33 mm/300 mm	-0.05 mm to 0 mm	Brinell 197	Medium	8632T386	000000


				400	10	0.33 mm/300 mm	-0.05 mm to 0 mm	Brinell 197	Medium	8632T387	00000
				1,200	10	0.33 mm/300 mm	-0.05 mm to 0 mm	Brinell 197	Medium	8632T388	00000