8 mm Axles | McMaster-Carr

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DFARS Specialty Metals

25 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.

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.

Highly Corrosion-Resistant 316 Stainless Steel—More corrosion resistant than 303 and 304 stainless steel shafts. They stand up to salt water and harsh chemicals, such as bleach, chlorine, and phosphoric acid.

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







				8 mm Diameter

				50	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N78	000000


				100	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N79	00000
				200	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N81	00000
				400	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N82	00000
				1,000	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N83	00000
				2,000	0.3 mm/300 mm	-0.051 mm to 0 mm	Brinell 197	Medium	4138N84	00000


				Corrosion-Resistant 303 Stainless Steel







								8 mm Diameter

								100	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N17	00000


								200	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N18	00000
								400	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N19	00000
								600	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N21	00000
								800	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N22	00000
								1,000	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	4143N23	00000


								Highly Corrosion-Resistant 316 Stainless Steel







												8 mm Diameter

												200	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	1265K64	00000


												400	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	1265K66	00000
												600	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	1265K67	00000
												800	0.18 mm/300 mm	-0.005 mm to 0 mm	Rockwell B83	Medium	1265K68	00000

Ball Screw/Splines and Bearings

From one compact system, transmit linear or rotary motion or both at once (sometimes called spiral motion). Because of these different motions, these ball screw/splines and bearings create efficient, fluid movements in complex automated applications, such as pick-and-place robots.

The ball bearings move smoothly and precisely, even at high speeds. They're powered independently, so you can drive one bearing at a time or both together to coordinate movements.

The ball screw/splines are hardened on the surface, so they stand up to repeated motion. They’re also hollow, so you can run electrical wiring, compressed air tubing, coolants, or lubricant through their center.

	Spline		Thread						Ball Screw Bearing				Ball Spline Bearing
	Lg., mm	No. of	Lg., mm	Direction, ° F	Thread Direction	ID, mm	Lg., mm	Root Dia., mm	OD, mm	Overall Lg., mm	Dynamic Load Cap., lb.	Static Load Cap., lb.	OD, mm	Overall Lg., mm	Dynamic Load Cap., lb.	Static Load Cap., lb.	Max. Dynamic Torque, in·lbf		Each
1055 Carbon Steel







				8 mm Dia. (Tolerance: -0.015 mm to 0 mm)

				200	4	180	5 to 176	Right Hand	3	200	7.44	19	28.5	240	400	16	25	330	580	17	4049N11	000000000

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



		8	9	28	15	M6 × 1 mm	8	0.733	6.35	2.56	Chamfered	Medium	Rockwell B84	2435K35	00000

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



		8	9	24	28	M6 × 1 mm	6.6	7	20	4	3	Straight	Medium	Rockwell B84	2435K31	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.

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







				8 mm Diameter

				300	300 mm	2 mm	1.2 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K211	000000


				500	500 mm	2 mm	1.2 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K221	00000
				1,000	1,000 mm	2 mm	1.2 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K231	00000
				1,200	1,200 mm	2 mm	1.2 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K241	00000
				1,500	1,500 mm	2 mm	1.2 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K251	00000
				1,800	1,800 mm	2 mm	1.2 mm	No	0.33 mm/300 mm	-0.0635 to 0	Rockwell B95	Medium	1439K11	00000