M20 Shoulder Bolts | McMaster-Carr

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66 Products

Steel Hex-Drive Shoulder Screws

Our strongest standard-fit shoulder screws. With the highest tensile strength, they withstand stress and mechanical loads that would break other materials, such as aluminum, nickel, and stainless steel. However, they do sacrifice corrosion resistance.

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

				Head, mm						Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Specs. Met		1-4	5-Up
Black-Oxide Alloy Steel







				24 mm Diameter Shoulder (-0.072 mm to -0.01 mm Tolerance)

				40	M20 × 2.5 mm	27	36	16	12	140,000	ISO 7379	000000000	000000	000000


				45	M20 × 2.5 mm	27	36	16	12	140,000	ISO 7379	000000000	00000	00000
				50	M20 × 2.5 mm	27	36	16	12	140,000	ASME B18.3.3M	000000000	00000	00000
				55	M20 × 2.5 mm	27	36	16	12	140,000	ISO 7379	000000000	00000	00000
				60	M20 × 2.5 mm	27	36	16	12	140,000	ASME B18.3.3M	000000000	00000	00000
				80	M20 × 2.5 mm	27	36	16	12	140,000	ASME B18.3.3M	000000000	00000	00000
				90	M20 × 2.5 mm	27	36	16	12	140,000	ASME B18.3.3M	000000000	00000	00000
				100	M20 × 2.5 mm	27	36	16	12	140,000	ASME B18.3.3M	000000000	00000	00000
				120	M20 × 2.5 mm	27	36	16	12	140,000	ASME B18.3.3M	000000000	00000	00000

Steel Hex Head Shoulder Screws

Create the tightest hold by generating more torque than you could with a socket head. Make sure there's room to fasten with a wrench or socket driver, as the drive is on the outside.

									Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Head Wd., mm	Head Ht., mm	Tensile Strength, psi	Specs. Met		1-4	5-Up
Steel







				21 mm Diameter Shoulder (0.002 mm to 0.015 mm Tolerance)

				17.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	000000	000000


				25.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000
				35.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000
				45.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000
				55.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000
				65.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000
				85.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000
				105.5	M20 × 2.5 mm	30.5	30	13	120,000	DIN 609	000000000	00000	00000

Stainless Steel Hex-Drive Shoulder Screws

These screws hold up against moisture and chemicals better than their steel counterparts, but they aren't as strong.

Check out our Made-to-Order Stainless Steel Hex-Drive Shoulder Screws if you don't see the shoulder length you need.

Highly-Corrosion-Resistant Black-Oxide 316 Stainless Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. Even if the coating wears off, these screws will hold up against corrosive agents in most environments, including salt water and most chemicals.

				Head, mm							Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Specs. Met	Material Certificate Form		1-4	5-Up
Highly-Corrosion-Resistant Black-Oxide 316 Stainless Steel







				24 mm Diameter Shoulder (-0.072 mm to -0.01 mm Tolerance)

				12	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	000000	000000


				16	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				20	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				25	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	—	000000000	00000	00000
				30	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	—	000000000	00000	00000
				35	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				40	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	—	000000000	00000	00000
				45	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				50	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				55	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				60	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000


				70	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	—	000000000	00000	00000
				80	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				90	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				100	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				110	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				120	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				130	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				140	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000
				150	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	—	000000000	00000	00000
				160	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	00000	00000


				170	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	000000	00000
				180	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	000000	00000
				190	M20 × 2.5 mm	27	36	16	12	70,000	ISO 7379	Digital	000000000	000000	000000

Same-Size Thread Stainless Steel Hex-Drive Shoulder Screws

Harness superior holding power with screws that also won't rust. Threads that match the shoulder diameter create a tighter hold than screws with a standard thread diameter. Use them in thicker materials and larger holes. While more corrosion resistant than alloy steel screws, they're not as strong.

Check out our Made-to-Order Same-Size Thread Stainless Steel Hex-Drive Shoulder Screws if you don't see the shoulder length you need.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

				Head, mm						Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Material Certificate Form		1-4	5-Up
18-8 Stainless Steel







				20 mm Diameter Shoulder (-0.04 mm to -0.01 mm Tolerance)

				15	M20 × 2.5 mm	27	30	14	10	70,000	—	000000000	000000	000000


				20	M20 × 2.5 mm	27	30	14	10	70,000	Digital	000000000	00000	00000
				25	M20 × 2.5 mm	27	30	14	10	70,000	—	000000000	00000	00000
				45	M20 × 2.5 mm	27	30	14	10	70,000	—	000000000	00000	00000
				55	M20 × 2.5 mm	27	30	14	10	70,000	—	000000000	00000	00000
				70	M20 × 2.5 mm	27	30	14	10	70,000	Digital	000000000	00000	00000
				110	M20 × 2.5 mm	27	30	14	10	70,000	—	000000000	000000	000000

Shoulder Shims

Shoulder

Shortening

Shoulder Shortening—Pare down the shoulder on screws or tighten the screw's hold. Stack multiple shims to get the exact spacing you need.

		Shoulder Shortening
	Thk.	For Screw Size	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				For 20 mm Diameter Shoulder

				0.005"	M20	5	000000000	000000


				0.01"	M20	5	000000000	00000
				0.015"	M20	5	000000000	0000
				0.02"	M20	5	000000000	00000
				0.025"	M20	5	000000000	00000
				0.031"	M20	5	000000000	00000
				0.062"	M20	5	000000000	00000

Made-to-Order Same-Size Thread Stainless Steel Hex-Drive Shoulder Screws

Harness superior holding power with custom-shoulder-length screws that also won't rust. These are ideal for replacing fasteners in older machines or for testing prototypes. Threads that match the shoulder diameter give them a tighter hold than screws with a standard thread diameter. Use them in thicker materials and larger holes.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

				Head, mm						Each
	Choose a Shoulder Length, mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Material Certificate Form		1-4	5-9	10-Up
18-8 Stainless Steel







				20 mm Diameter Shoulder (-0.072 mm to -0.01 mm Tolerance)

				13.00 to 49.75	M20 × 2.5 mm	22	30	14	10	70,000	Digital	000000000	000000	000000	000000


				50.00 to 99.75	M20 × 2.5 mm	22	30	14	10	70,000	Digital	000000000	00000	00000	00000

Made-to-Order Stainless Steel Hex-Drive Shoulder Screws

Specify the exact shoulder length you need in screws that won't rust. These are ideal for replacing fasteners in older machines or for testing prototypes.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

				Head, mm						Each
	Choose a Shoulder Length, mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Material Certificate Form		1-4	5-9	10-Up
18-8 Stainless Steel







				24 mm Diameter Shoulder (-0.072 mm to -0.01 mm Tolerance)

				13.00 to 49.75	M20 × 2.5 mm	27	36	16	12	70,000	Digital	000000000	000000	000000	000000


				50.00 to 99.75	M20 × 2.5 mm	27	36	16	12	70,000	Digital	000000000	00000	00000	00000

Eyebolts—For Lifting

Also known as machinery 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. Eyebolts without shoulder are for vertical lifting only.

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

Steel

Closed Eye

With Shoulder

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread						With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Threading	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	40	40	41	6,275	Fully Threaded	135	0000000	000000

Zinc-Plated Steel

Closed Eye

With Shoulder

Zinc-plated steel eyebolts offer good corrosion resistance.

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Specs. Met	Threading	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	30	30	40	2,625	DIN 580	Fully Threaded	101	0000000	000000

Galvanized Steel

Closed Eye

With Shoulder

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

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread						With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Threading	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	57	57	43	6,275	Fully Threaded	152	0000000	000000

304 Stainless Steel

Closed Eye

With Shoulder

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

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Specs. Met	Threading	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	30	30	40	2,625	DIN 580	Fully Threaded	101	0000000	000000

316 Stainless Steel

Closed Eye

With Shoulder

316 stainless steel eyebolts are the most corrosion resistant.

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Specs. Met	Threading	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	30	30	40	2,625	DIN 580	Fully Threaded	101	0000000	000000

Rotating Eyebolts—For Lifting

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

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

Powder-Coated Steel

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

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Threading	Color	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	30	30	40	5,050	Fully Threaded	Pink	104	0000000	0000000

Nylon-Coated Eyebolts—For Lifting

Route wire and cable through the smooth eye without snagging.

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

Nylon-Coated Steel

Closed Eye

With Shoulder

Closed Eye—Closed eyes are stronger than bent-closed eyes.

	Thread							With Shoulder
	Size	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vert. Cap., lb.	Threading	Temp. Range, ° F	Overall Lg., mm		Each
Closed Eye



		M20 × 2.5 mm	40	40	43	6,275	Fully Threaded	30 to 275	135	0000000	000000