M20 Shoulder Bolts | McMaster-Carr

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59 Products

About Shoulder Screws

Comparable to Class 12.9 steel, these alloy steel shoulder screws are the strongest we offer. They have a standard shoulder with an undersized tolerance to fit most machinery and equipment. Also known as stripper bolts, they're commonly used in punch and die assemblies, and as an axle or pivot point.

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

											Each
Shoulder Lg., mm	Thread Size	Thread Pitch, mm	Thread Lg., mm	Head Dia., mm	Head Ht., mm	Finish	Tensile Strength, psi	Drive Size, mm	Specifications Met		1-4	5-Up
24 mm Shoulder Dia.—Standard Fit (-0.072 to -0.01 mm Dia. Tolerance)
40	M20	2.5	27	36	16	Black Oxide	140,000	12	ISO 7379	000000000	000000	000000
45	M20	2.5	27	36	16	Black Oxide	140,000	12	ISO 7379	000000000	00000	00000
50	M20	2.5	27	36	16	Black Oxide	140,000	12	ASME B18.3.3M	000000000	00000	00000
55	M20	2.5	27	36	16	Black Oxide	140,000	12	ISO 7379	000000000	00000	00000
60	M20	2.5	27	36	16	Black Oxide	140,000	12	ASME B18.3.3M	000000000	00000	00000
80	M20	2.5	27	36	16	Black Oxide	140,000	12	ASME B18.3.3M	000000000	00000	00000
90	M20	2.5	27	36	16	Black Oxide	140,000	12	ASME B18.3.3M	000000000	00000	00000
100	M20	2.5	27	36	16	Black Oxide	140,000	12	ASME B18.3.3M	000000000	00000	00000
120	M20	2.5	27	36	16	Black Oxide	140,000	12	ASME B18.3.3M	000000000	00000	00000

Metric 18-8 Stainless Steel Shoulder Screws

Made from 18-8 stainless steel, these shoulder screws have good chemical resistance and may be mildly magnetic. A standard shoulder with an undersized tolerance allows them to fit most machinery and equipment. They’re often used to guide or align components, and as an axle or pivot point.

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

Made-to-Order Shoulder Screws

For made-to-order shoulder screws, please specify the shoulder length in 0.25 mm increments.

									Each
Thread Size	Thread Pitch, mm	Thread Lg., mm	Head Dia., mm	Head Ht., mm	Tensile Strength, psi	Drive Size, mm	Choose a Shoulder Lg., mm		1-4	5-9	10-Up
20 mm Shoulder Dia.—Standard Fit (-0.072 to -0.01 mm Dia. Tolerance)
M20	2.5	22	30	14	70,000	10	13-49.75	000000000	000000	000000	000000
M20	2.5	22	30	14	70,000	10	50-99.75	000000000	00000	00000	00000
24 mm Shoulder Dia.—Standard Fit (-0.072 to -0.01 mm Dia. Tolerance)
M20	2.5	27	36	16	70,000	12	13-49.75	000000000	00000	00000	00000
M20	2.5	27	36	16	70,000	12	50-99.75	000000000	00000	00000	00000

Same-Size Thread 18-8 Stainless Steel Shoulder Screws

Uncoated

With threads the same diameter as the shoulder, these screws can handle heavy loads. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. A standard shoulder with an undersized tolerance allows them to fit most machinery and equipment. They’re often used to guide or align components, and as an axle or pivot point.

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

Metric

								Uncoated
									Each
Shoulder Lg., mm	Thread Size	Thread Pitch, mm	Thread Lg., mm	Head Dia., mm	Head Ht., mm	Tensile Strength, psi	Drive Size, mm		1-4	5-Up
20 mm Shoulder Dia.—Standard Fit (-0.04 to -0.01 mm Dia. Tolerance)
15	M20	2.5	27	30	14	70,000	10	000000000	000000	000000
20	M20	2.5	27	30	14	70,000	10	000000000	00000	00000
25	M20	2.5	27	30	14	70,000	10	000000000	00000	00000
45	M20	2.5	27	30	14	70,000	10	000000000	00000	00000
55	M20	2.5	27	30	14	70,000	10	000000000	00000	00000
70	M20	2.5	27	30	14	70,000	10	000000000	00000	00000
110	M20	2.5	27	30	14	70,000	10	000000000	000000	000000

Metric 316 Stainless Steel Shoulder Screws

More corrosion resistant than 18-8 stainless steel shoulder screws, these have excellent resistance to chemicals and salt water. They may be mildly magnetic. A standard shoulder with an undersized tolerance allows them to fit most machinery and equipment. They’re often used to guide or align components, and as an axle or pivot point.

Black-oxide stainless steel screws have a matte black finish.

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

Shoulder Screws with a Black-Oxide Finish

										Each
Shoulder Lg., mm	Thread Size	Thread Pitch, mm	Thread Lg., mm	Head Dia., mm	Head Ht., mm	Tensile Strength, psi	Drive Size, mm	Specifications Met		1-4	5-Up
24 mm Shoulder Dia.—Standard Fit (-0.072 to -0.01 mm Dia. Tolerance)
12	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	000000	000000
16	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
20	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
25	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
30	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
35	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
40	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
45	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
50	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
55	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
60	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
70	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
80	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
90	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
100	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
110	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
120	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
130	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
140	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
150	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
160	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	00000	00000
170	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	000000	00000
180	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	000000	00000
190	M20	2.5	27	36	16	70,000	12	ISO 7379	000000000	000000	000000

Metric Steel Hex Head Shoulder Screws

Also known as wheel and axle bolts, these metric screws have an unthreaded shoulder that acts as a shaft, so material attached to the threaded end can rotate. Made of steel, they are strong enough to withstand pulling and stretching without breaking. They are often used with bearings, pulleys, valves, and pumps. The hex head lets you tighten these screws with a wrench, and keeps them in place once they are installed. All of these screws meet DIN 609, which is an international standard for shoulder screw dimensions.

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

									Each
Shoulder Lg., mm	Thread Size	Thread Pitch, mm	Thread Lg., mm	Head Wd., mm	Head Ht., mm	Tensile Strength, psi	Specifications Met		1-4	5-Up
21 mm Shoulder Dia.—Standard Fit (0.002 mm to 0.015 mm Dia. Tolerance)
17.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	000000	000000
25.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000
35.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000
45.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000
55.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000
65.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000
85.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000
105.5	M20	2.5	30.5	30	13	120,000	DIN 609	000000000	00000	00000

Eyebolts—For Lifting

With Shoulder

Also known as machinery eyebolts.

Zinc-plated steel eyebolts offer good corrosion resistance.

Galvanized steel eyebolts have a hot-dipped finish for more corrosion resistance than zinc-plated steel.

304 stainless steel eyebolts are more corrosion resistant than galvanized steel.

316 stainless steel are the most corrosion resistant eyebolts.

Note: Capacities listed are for vertical lifting only. Eyebolts with shoulder can be used for angular lifting up to 45°, but the capacities will be significantly reduced. For angular lifting, we recommend Hoist Rings.

Warning: Never use to lift people or items over people.

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

Metric Thread

Thread								With Shoulder
Size	Pitch, mm	Lg., mm	Shank Lg., mm	Overall Lg., mm	Eye Dia., mm	Vertical Capacity, lbs.	Specifications Met		Each
Steel
M20	2.5	40	40	135	41	6,275	__	0000000	000000
Zinc-Plated Steel
M20	2.5	30	30	101	40	2,625	DIN 580	0000000	00000
Galvanized Steel
M20	2.5	57	57	152	43	6,275	__	0000000	00000
304 Stainless Steel
M20	2.5	30	30	101	40	2,625	DIN 580	0000000	00000
316 Stainless Steel
M20	2.5	30	30	101	40	2,625	DIN 580	0000000	00000

Rotating Eyebolts—For Lifting

Eyebolt

Unlike conventional eyebolts, you can rotate the eye 360° to match the angle of your load.

Powder-coated steel eyebolts are impact resistant, but less corrosion resistant than stainless steel eyebolts. They include a removable key for tightening the bolt.

Warning: Never use to lift people or items over people.

Metric Thread

Thread								With Shoulder
Size	Pitch, mm	Lg., mm	Shank Lg., mm	Overall Lg., mm	Eye Dia., mm	Vertical Capacity, lbs.	Color		Each
Powder-Coated Steel
M20	2.5	30	30	104	40	5,050	Pink	0000000	0000000

Nylon-Coated Eyebolts—For Lifting

With Shoulder

Route wire and cable through the smooth eye without snagging.

Warning: Never use to lift people or items over people.

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

Metric Thread

Thread							With Shoulder
Size	Pitch, mm	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vertical Capacity, lbs.	Temperature Range, °F	Overall Lg., mm		Each
Nylon-Coated Steel
M20	2.5	40	40	43	6,275	30° to 275°	135	0000000	000000

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About Shoulder Screws

Metric Alloy Steel Shoulder Screws

Metric 18-8 Stainless Steel Shoulder Screws

Same-Size Thread 18-8 Stainless Steel Shoulder Screws

Metric 316 Stainless Steel Shoulder Screws

Metric Steel Hex Head Shoulder Screws

Eyebolts—For Lifting

Rotating Eyebolts—For Lifting

Nylon-Coated Eyebolts—For Lifting