12mm Axles | McMaster-Carr

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Metric

End Type

Plain

Retaining Ring Groove

Length

Material

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Thread Size

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For Motion

Hardness Rating

Overall Length

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Shaft Type

Hardness

DFARS Specialty Metals

Tolerance Rating

REACH

RoHS

Export Control Classification Number (ECCN)

1C999

EAR99

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

Yes

Number of Grooves

Keyway Width

4 mm

Thread Length

9.9 mm

10.66 mm

Straightness Tolerance Rating

Steel Grade

Flat Width

38 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







				12 mm Diameter

				50	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N87	000000


				100	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N88	00000
				200	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K18	00000
				400	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K19	00000
				500	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K21	00000
				1,000	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K22	00000
				1,200	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K23	00000
				1,500	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K24	00000
				2,000	0.3 mm/300 mm	-0.076 mm to 0 mm	Rockwell C25	Hard	1482K25	00000


				High-Strength Alloy Steel







								12 mm Diameter

								152	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N46	00000


								305	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N47	00000
								914	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N48	000000
								1,829	0.3 mm/300 mm	-0.025 mm to 0 mm	Rockwell C28	Hard	2672N49	000000


								Corrosion-Resistant 303 Stainless Steel







												12 mm Diameter

												100	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N31	00000


												200	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N32	00000
												400	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N33	00000
												600	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N34	00000
												800	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N35	00000
												1,000	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N36	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



		12	12	35	22	M8 × 1.25 mm	10.66	0.99	8.71	3.12	Chamfered	Medium	Rockwell B84	2435K37	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



		12	12	33	36	M10 × 1.5 mm	9.9	9	26	4	4	Straight	Medium	Rockwell B84	2435K33	000000

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







				12 mm Diameter

				200	6	0.33 mm/300 mm	-0.05 mm to 0 mm	Brinell 197	Medium	8632T383	000000


				400	6	0.33 mm/300 mm	-0.05 mm to 0 mm	Brinell 197	Medium	8632T384	00000
				1,200	6	0.33 mm/300 mm	-0.05 mm to 0 mm	Brinell 197	Medium	8632T385	00000

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







				12 mm Diameter

				300	300 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K411	000000


				500	500 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K421	00000
				1,000	1,000 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K431	00000
				1,200	1,200 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K441	00000
				1,500	1,500 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K451	00000
				1,800	1,800 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K13	000000


				Corrosion-Resistant 304 Stainless Steel







								12 mm Diameter

								200	200 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K215	00000


								400	400 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K216	00000
								1,000	1,000 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K217	00000
								2,000	2,000 mm	4 mm	2.5 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B90	Medium	7398K218	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







				12 mm Diameter

				200	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N33	000000


				400	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N34	00000
				600	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N35	00000
				1,000	0.18 mm/300 mm	-0.01 mm to -0.005 mm	Rockwell B83	Medium	4149N36	000000