12mm Axles | McMaster-Carr

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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.

For technical drawings and 3-D models, click on a part number.

Metric—1566 Carbon Steel
Lg.	Lg. Tolerance	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
12mm 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—1045 Carbon Steel
12mm Dia. (Tolerance: -0.051mm to 0mm)
50mm	-1.57mm to 1.57mm	0.3 mm per 300 mm	Chamfered	Medium	Brinell 197	0000000	00000
100mm	-1.57mm to 1.57mm	0.3 mm per 300 mm	Chamfered	Medium	Brinell 197	0000000	00000
Metric—4140 Alloy Steel
12mm 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
12mm Dia. (Tolerance: -0.005mm 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	00000
600mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	00000
800mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	00000
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.

For technical drawings and 3-D models, click on a part number.

		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
12mm	12mm	33mm	36mm	M10	1.5 mm	9.9mm	9mm	26mm	4	4mm	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.

For technical drawings and 3-D models, click on a part number.

		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
12mm	12mm	35mm	22mm	M8	1.25 mm	10.66mm	0.99mm	8.71mm	3.12mm	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.

For technical drawings and 3-D models, click on a part number.

	Keyway
Lg.	Lg.	Wd.	Dp.	ANSI Keys Included	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
Metric—1045 Carbon Steel
12mm Dia. (Tolerance: -0.0635mm to 0mm)
300mm	300mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	000000
500mm	500mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	00000
1,000mm	1,000mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	00000
1,200mm	1,200mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	00000
1,500mm	1,500mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	00000000	00000
1,800mm	1,800mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B95	0000000	000000
Metric—304 Stainless Steel
12mm Dia. (Tolerance: -0.0635mm to 0mm)
200mm	200mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	00000
400mm	400mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	00000
1,000mm	1,000mm	4mm	2.5mm	No	0.33 mm per 300 mm	Chamfered	Medium	Rockwell B90	00000000	00000
2,000mm	2,000mm	4mm	2.5mm	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.

For technical drawings and 3-D models, click on a part number.

Metric—1045 Carbon Steel
Lg.	Lg. Tolerance	Flat Wd.	D-Profile Lg.	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
12mm Dia. (Tolerance: -0.05mm to 0mm)
200mm	-1.57mm to 1.57mm	6mm	200 mm	0.33 mm per 300 mm	Chamfered	Medium	Brinell 197	00000000	000000
400mm	-1.57mm to 1.57mm	6mm	400 mm	0.33 mm per 300 mm	Chamfered	Medium	Brinell 197	00000000	00000
1,200mm	-1.57mm to 1.57mm	6mm	1,200 mm	0.33 mm per 300 mm	Chamfered	Medium	Brinell 197	00000000	00000

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.

For technical drawings and 3-D models, click on a part number.

Metric—303 Stainless Steel
Lg.	Lg. Tolerance	Straightness Tolerance	Edge Type	Hardness Rating	Hardness		Each
12mm 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	00000
600mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	00000
1,000mm	-0.25mm to 0.25mm	0.18 mm per 300 mm	Chamfered	Medium	Rockwell B83	0000000	000000

About Shafts

Rotary Shafts

Flange-Mount Idler Rotary Shafts

​Thread-Mount Idler Rotary Shafts

Keyed Rotary Shafts

D-Profile Rotary Shafts

Undersized Rotary Shafts

Thread-Mount Idler Rotary Shafts