3/8" Axles | McMaster-Carr

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113 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.

Black-Oxide Carbon Steel—Typically chosen for their appearance, these shafts have a dark, matte coating for a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Chrome-Plated Carbon Steel—The chrome plating creates a hard, protective barrier that withstands moisture. However, it can chip or flake under repeated impact or shock loads.

Corrosion-Resistant Nitride-Coated Carbon Steel—Combine the strength of steel with the corrosion resistance of stainless steel. The nitride coating resists moisture, oxidation, and mild chemicals, but not salt water or strong acids and alkalis. Unlike chrome plating, it won't flake or chip.

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.

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		Finish
	Lg.	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating	Hardness	Hardness Rating		Each
Carbon Steel







				3/8" Diameter

				12"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K11	000000


				18"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K511	00000
				24"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K12	00000
				36"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K13	00000
				48"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K14	00000
				60"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K15	00000
				72"	0.012"/1 ft.	-0.003" to 0"	Rockwell C25	Hard	—	—	1346K16	00000


				Black-Oxide Carbon Steel







								3/8" Diameter

								12"	0.003"/1 ft.	-0.001" to 0"	Rockwell C20	Hard	Rockwell C19	Medium	1886K11	0000


								18"	0.003"/1 ft.	-0.001" to 0"	Rockwell C20	Hard	Rockwell C19	Medium	1886K12	00000
								24"	0.003"/1 ft.	-0.001" to 0"	Rockwell C20	Hard	Rockwell C19	Medium	1886K13	00000
								36"	0.003"/1 ft.	-0.001" to 0"	Rockwell C20	Hard	Rockwell C19	Medium	1886K14	00000
								48"	0.003"/1 ft.	-0.001" to 0"	Rockwell C20	Hard	Rockwell C19	Medium	1886K15	00000
								60"	0.003"/1 ft.	-0.001" to 0"	Rockwell C20	Hard	Rockwell C19	Medium	1886K16	00000


								Chrome-Plated Carbon Steel







												3/8" Diameter

												12"	0.003"/1 ft.	-0.001" to 0"	Brinell 190	Medium	Rockwell C68	Ultra Hard	5947K12	00000


												18"	0.003"/1 ft.	-0.001" to 0"	Brinell 190	Medium	Rockwell C68	Ultra Hard	5947K24	00000
												24"	0.003"/1 ft.	-0.001" to 0"	Brinell 190	Medium	Rockwell C68	Ultra Hard	5947K36	00000
												36"	0.003"/1 ft.	-0.001" to 0"	Brinell 190	Medium	Rockwell C68	Ultra Hard	5947K48	00000
												48"	0.003"/1 ft.	-0.001" to 0"	Brinell 190	Medium	Rockwell C68	Ultra Hard	5947K61	00000


												Corrosion-Resistant Nitride-Coated Carbon Steel







														3/8" Diameter

		12"												0.003"/1 ft.	-0.001" to 0"	Not Rated	Not Rated	Rockwell C60	Extra Hard	5936K61	0000


		18"	0.003"/1 ft.											-0.001" to 0"	Not Rated	Not Rated	Rockwell C60	Extra Hard	5936K62	00000
		24"	0.003"/1 ft.											-0.001" to 0"	Not Rated	Not Rated	Rockwell C60	Extra Hard	5936K63	00000
		36"	0.003"/1 ft.											-0.001" to 0"	Not Rated	Not Rated	Rockwell C60	Extra Hard	5936K64	00000
		48"	0.003"/1 ft.											-0.001" to 0"	Not Rated	Not Rated	Rockwell C60	Extra Hard	5936K65	00000
		60"	0.003"/1 ft.											-0.001" to 0"	Not Rated	Not Rated	Rockwell C60	Extra Hard	5936K66	00000


		High-Strength Alloy Steel







					3/8" Diameter

					6"										0.0125"/1 ft.	-0.001" to 0"	Rockwell C28	Hard	—	—	2672N15	00000


					12"	0.0125"/1 ft.									-0.001" to 0"	Rockwell C28	Hard	—	—	2672N16	00000
					36"	0.0125"/1 ft.	-0.001" to 0"								Rockwell C28	Hard	—	—	2672N17	00000
					72"	0.0125"/1 ft.	-0.001" to 0"								Rockwell C28	Hard	—	—	2672N18	000000


					Corrosion-Resistant 303 Stainless Steel







																3/8" Diameter

																12"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B83	Medium	—	—	8364T1	00000


								18"	0.0072"/1 ft.							-0.0002" to 0"	Rockwell B83	Medium	—	—	8364T2	00000
								24"	0.0072"/1 ft.							-0.0002" to 0"	Rockwell B83	Medium	—	—	8364T3	00000
								36"	0.0072"/1 ft.							-0.0002" to 0"	Rockwell B83	Medium	—	—	8364T4	00000
								48"	0.0072"/1 ft.	-0.0002" to 0"						Rockwell B83	Medium	—	—	8364T32	00000
								60"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B83					Medium	—	—	8364T42	000000
								72"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B83					Medium	—	—	8364T48	000000


								Highly Corrosion-Resistant 316 Stainless Steel







																3/8" Diameter

												3"	0.0072"/1 ft.			-0.0002" to 0"	Rockwell B83	Medium	—	—	1263K193	00000


4"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K194	00000
5"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K195	00000
6"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K78	00000
9"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K198	00000
12"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K79	00000
18"	0.003"/1 ft.											-0.001" to 0"	Rockwell C20			Hard	—	—	6493K1	00000
18"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K81	00000
24"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K82	00000
36"	0.003"/1 ft.											-0.001" to 0"	Rockwell C20			Hard	—	—	6493K2	000000
36"	0.0072"/1 ft.											-0.0002" to 0"	Rockwell B83			Medium	—	—	1263K84	000000


60"	0.003"/1 ft.											-0.001" to 0"	Rockwell C20			Hard	—	—	6493K3	000000

Wheel Axles

Axle

Replace worn or broken caster axles.

Thread Lg.	Includes		Each







Zinc-Plated Steel

3/8"	2 3/16"	3/8"-16	9/16"	Hex Nut	23595T14	00000


3/8"	2 1/2"	3/8"-16	1"	Hex Nut	23595T15	0000

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	Lg.	Flange Thk.	Bolt Circle Dia.	No. of	Dia.	Edge Type	Hardness Rating	Hardness		Each
Threaded End—Zinc-Plated 1215 Carbon Steel



		3/8"	7/16"	1 3/16"	1 1/4"	5/16"-18	15/32"	9/32"	29/32"	4	5/32"	Straight	Not Rated	Not Rated	2435K12	000000

Tapped Rotary Shafts

Directly connect threaded components to these internally threaded shafts, or secure fan blades and other accessories with a fastener. Turned, ground, and polished to tight tolerances, they evenly distribute loads, reduce vibration, and improve accuracy.

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

		Thread				Material
	Lg.	Size	Lg.	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Carbon Steel







				3/8" Diameter

				6"	10-32	3/8"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B75	Medium	4162N11	000000


				6"	1/4"-20	1/2"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B75	Medium	4162N12	00000
				12"	10-32	3/8"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B75	Medium	4162N13	00000
				12"	1/4"-20	1/2"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B75	Medium	4162N14	00000
				24"	10-32	3/8"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B75	Medium	4162N15	00000
				24"	1/4"-20	1/2"	0.0072"/1 ft.	-0.0002" to 0"	Rockwell B75	Medium	4162N16	00000

Retaining-Ring-Grooved Rotary Shafts

Clip retaining rings into the grooves to position gears, sprockets, and bearings without bulky collars or clamps. 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.

		Groove				No. of Grooves				Material
	Lg.	Wd.	Dia.	End-to-Groove Lg.	Groove-to-Groove Lg.	First End	Second End	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Corrosion-Resistant 303 Stainless Steel







				3/8" Diameter

				3"	0.039"	0.303"	0.063"	0.375"	5	2	0.0096"/1 ft.	-0.0002" to 0"	Rockwell B83	Medium	2025K5	000000


				6"	0.039"	0.303"	0.063"	0.375"	5	2	0.0096"/1 ft.	-0.0002" to 0"	Rockwell B83	Medium	2025K6	00000
				12"	0.039"	0.303"	0.063"	0.375"	5	2	0.0096"/1 ft.	-0.0002" to 0"	Rockwell B83	Medium	2025K8	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.

Lightweight Aluminum—Best for light duty applications, these shafts are one-third the weight of steel shafts, corrosion resistant, and easy to machine.

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







				3/8" Diameter

				3"	3"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K4	00000


				6"	6"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K5	00000
				9"	9"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K6	00000
				12"	12"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K121	00000
				18"	18"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K952	00000
				24"	24"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K21	00000
				36"	36"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K22	00000
				48"	48"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K23	00000
				60"	60"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K24	00000
				72"	72"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B95	Medium	1497K25	00000


				Corrosion-Resistant 304 Stainless Steel







								3/8" Diameter

								3"	3"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K1	0000


								6"	6"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K2	00000
								9"	9"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K3	00000
								12"	12"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K48	00000
								24"	24"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K11	00000
								36"	36"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K31	00000
								48"	48"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K51	00000
								60"	60"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K71	00000
								72"	72"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7398K91	00000


								Highly Corrosion-Resistant 316 Stainless Steel







												3/8" Diameter

												3"	3"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K1	00000


												6"	6"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K2	00000
												9"	9"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K3	00000
												12"	12"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K48	00000
												24"	24"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K11	00000
												36"	36"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K31	00000
48"												48"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K51	00000
72"	72"											3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Rockwell B85	Medium	7405K91	000000


Lightweight Aluminum







												3/8" Diameter

												6"	6"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Brinell 120	Soft	1570K31	00000


												12"	12"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Brinell 120	Soft	1570K32	00000
												24"	24"	3/32"	3/64"	No	0.013"/1 ft.	-0.0025" to 0"	Brinell 120	Soft	1570K33	00000

Partially Keyed

These shafts combine keyed ends with a plain center for versatile assembly. The keyways on the ends lock with the included ANSI machine keys to transmit torque to components such as gears and sprockets. The plain center fits bearings and other round-bore parts.

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

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







				3/8" Diameter

				24"	4", 14"	3/32", 3/32"	3/64", 3/64"	One 2" Long Key, One 4" Long Key	0.003"/1 ft.	-0.002" to 0"	Brinell 190	Medium	6117K121	000000


				36"	4", 14"	3/32", 3/32"	3/64", 3/64"	One 2" Long Key, One 4" Long Key	0.003"/1 ft.	-0.002" to 0"	Brinell 190	Medium	6117K122	00000
				48"	4", 14"	3/32", 3/32"	3/64", 3/64"	One 2" Long Key, One 4" Long Key	0.003"/1 ft.	-0.002" to 0"	Brinell 190	Medium	6117K123	00000
				60"	4", 14"	3/32", 3/32"	3/64", 3/64"	One 2" Long Key, One 4" Long Key	0.003"/1 ft.	-0.002" to 0"	Brinell 190	Medium	6117K124	00000
				72"	4", 14"	3/32", 3/32"	3/64", 3/64"	One 2" Long Key, One 4" Long Key	0.003"/1 ft.	-0.002" to 0"	Brinell 190	Medium	6117K125	00000

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



		3/8"	7/16"	1 7/32"	3/4"	1/4"-20	11/32"	0.039"	0.303"	0.125"	Chamfered	Not Rated	Not Rated	2435K2	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.

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.	Flat Wd.	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Carbon Steel







				3/8" Diameter

				6"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8632T133	00000


				12"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8632T1	00000
				24"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8632T2	00000
				36"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8632T3	00000
				48"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8632T4	00000


				Corrosion-Resistant 303 Stainless Steel







								3/8" Diameter

								6"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B83	Medium	8632T145	00000


								12"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B83	Medium	8632T152	00000
								24"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B83	Medium	8632T155	00000
								36"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B83	Medium	8632T158	00000
								48"	3/16"	0.012"/1 ft.	-0.003" to 0"	Rockwell B83	Medium	8632T162	00000

Tapped D-Profile Rotary Shafts

Directly attach accessories and securely mount power-transmission components. These shafts have threaded ends to connect fan blades, mixer propellers, and other accessories with a fastener. The flat length mates with D-shaped bores and gives set screws an even surface to dig into, so gears, bearings, and sprockets won’t slip as the shaft rotates. Turned, ground, and polished, 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.

			Thread				Material
	Lg.	Flat Wd.	Size	Lg.	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Carbon Steel







				3/8" Diameter

				6"	3/16"	10-32	0.375"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8017T2	000000


				12"	3/16"	10-32	0.375"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8017T8	00000
				24"	3/16"	10-32	0.375"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8017T15	00000
				36"	3/16"	10-32	0.375"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8017T22	00000
				48"	3/16"	10-32	0.375"	0.012"/1 ft.	-0.003" to 0"	Rockwell B90	Medium	8017T28	00000

Sleeve Splines and Bearings

Often used in wet and dirty environments, these sleeve splines and bearings create a compact linear and rotary motion system. The grooves on the splines transmit rotary power as the sleeve bearing moves freely along their length. Sleeve bearings don't have moving parts that can be damaged from dirt and debris. And they don't need to be lubricated, making them overall lower maintenance than ball bearings.

Splines

Splines are PTFE coated to reduce friction, so bearings slide smoothly and last longer. They’re stainless steel, so they won’t rust.

	Spline
	Lg.	No. of	Lg.	Lg. Tolerance	Root Dia.	Material	Edge Type	Hardness Rating	Hardness		Each
3/8" Diameter (Tolerance: -0.002" to 0.002")



		12"	16	12"	0" to 0.25"	0.306"	PTFE-Coated 304 Stainless Steel	Straight	Medium	Rockwell B70	4134N14	000000


		24"	16	24"	0" to 0.25"	0.306"	PTFE-Coated 304 Stainless Steel	Straight	Medium	Rockwell B70	4134N15	000000
		36"	16	36"	0" to 0.25"	0.306"	PTFE-Coated 304 Stainless Steel	Straight	Medium	Rockwell B70	4134N16	000000