M2 Shoulder Bolts | McMaster-Carr

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Export Control Classification Number (ECCN)

EAR99

Relative Thread Length

Short

Standard

Minimum Shear Strength

REACH

DFARS Specialty Metals

144 Products

Performance

Precision

Twice as precise as standard-fit for smooth, accurate movement

41 products

Made-to-Order

Request the exact shoulder length you're looking for

4 products

Performance

High Strength

Withstand heavy loads and high stress without breaking

20 products

Wear Resistant

Withstand repeated friction without breaking down

20 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







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

				3	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	00000	00000


				3	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				4	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				4	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				6	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				6	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				8	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				8	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				10	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				10	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				12	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000


				12	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				16	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				16	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				20	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				20	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				25	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				25	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000
				30	M2 × 0.4 mm	3	5	2	1.5	140,000	—	000000000	0000	0000
				30	M2 × 0.4 mm	4	5	2	1.5	140,000	ASTM A108	000000000	0000	0000

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.

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.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but they won't hold up to the harsh chemicals that 316 stainless steel can.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these screws won't degrade when exposed to harsh weather, salt water, and most chemicals.

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	Material Certificate Form		1-4	5-Up
18-8 Stainless Steel







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

				3	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	00000	00000


				4	M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
				5	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				6	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				8	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				10	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				20	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				25	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				30	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
				40	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	00000	00000
				50	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	00000	00000




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

						4	M2 × 0.4 mm	5	6	3	2	70,000	—	000000000	0000	0000


						5	M2 × 0.4 mm	5	6	3	2	70,000	—	000000000	0000	0000
						6	M2 × 0.4 mm	5	6	3	2	70,000	—	000000000	0000	0000
						10	M2 × 0.4 mm	5	6	3	2	70,000	—	000000000	00000	00000


						Black-Oxide 18-8 Stainless Steel







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

										12	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000


										16	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
										25	M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	00000	0000
										30	M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	00000	00000
										40	M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	00000	00000




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

												8	M2 × 0.4 mm	5	6	3	2	70,000	—	000000000	00000	00000


												Highly Corrosion-Resistant 316 Stainless Steel







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

			3										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000


			4										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			5										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			6										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			7										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			8										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			9										M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
			10										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			12										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			14										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			15										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000


			16										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			18										M2 × 0.4 mm	4	5	2	2	70,000	—	000000000	0000	0000
			20	M2 × 0.4 mm									4	5	2	2	70,000	Digital	000000000	00000	0000
			22	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	0000
			25	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	00000
			30	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	00000
			35	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	00000
			40	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	00000
			45	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	00000
			50	M2 × 0.4 mm	4								5	2	2	70,000	—	000000000	00000	00000




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

					4	M2 × 0.4 mm							5	6	3	2	70,000	—	000000000	0000	0000


					5	M2 × 0.4 mm	5						6	3	2	70,000	Digital	000000000	0000	0000
					6	M2 × 0.4 mm	5						6	3	2	70,000	Digital	000000000	00000	0000
					8	M2 × 0.4 mm	5	6					3	2	70,000	Digital	000000000	00000	00000
					10	M2 × 0.4 mm	5	6	3				2	70,000	—	000000000	00000	00000


					Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel







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

									3				M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	0000	0000


									4	M2 × 0.4 mm	4		5	2	2	70,000	Digital	000000000	0000	0000
									5	M2 × 0.4 mm	4		5	2	2	70,000	Digital	000000000	0000	0000
									6	M2 × 0.4 mm	4		5	2	2	70,000	Digital	000000000	0000	0000
7									M2 × 0.4 mm	4	5		2	2	70,000	Digital	000000000	0000	0000
8									M2 × 0.4 mm	4	5		2	2	70,000	Digital	000000000	0000	0000
9									M2 × 0.4 mm	4	5		2	2	70,000	Digital	000000000	0000	0000
10									M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
12	M2 × 0.4 mm								4	5	2	2	70,000	Digital	000000000	0000	0000
14	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	0000	0000
15	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	0000


16	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	0000
18	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	0000
20	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
22	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
25	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
30	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
35	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
40	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
45	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000
50	M2 × 0.4 mm	4							5	2	2	70,000	Digital	000000000	00000	00000




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

		4							M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	0000


		5							M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	00000
		6							M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	00000
		8							M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	00000
		10							M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	00000

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 4 mm Diameter Shoulder

				0.005"	M4	10	000000000	000000


				0.01"	M4	10	000000000	00000
				0.031"	M4	10	000000000	00000


				Highly Corrosion-Resistant 316 Stainless Steel







								For 4 mm Diameter Shoulder

								0.005"	M4	10	000000000	00000


								0.01"	M4	10	000000000	00000
								0.031"	M4	10	000000000	0000

Stainless Steel Low-Profile Hex-Drive Precision Shoulder Screws

Fit into tight spaces in corrosive environments. The head on these screws is about one-half to two-thirds the height of standard-profile screw heads, so they're not suited for high-strength fastening. They are engineered to tight tolerances for assemblies that require smooth and accurate movement, with shoulder diameters twice as precise as those on standard-fit screws.

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







				3 mm Diameter Shoulder (-0.025 mm to 0 mm Tolerance)

				2	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	00000	00000


				3	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				4	M2 × 0.4 mm	4	5	1.3	1.5	85,000	Digital	000000000	0000	0000
				5	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				6	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				7	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				8	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				10	M2 × 0.4 mm	4	5	1.3	1.5	85,000	Digital	000000000	0000	0000
				12	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				14	M2 × 0.4 mm	4	5	1.3	1.5	85,000	Digital	000000000	0000	0000
				16	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000


				18	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				20	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000
				25	M2 × 0.4 mm	4	5	1.3	1.5	85,000	—	000000000	0000	0000

Stainless Steel Ultra-Low-Profile Hex-Drive Precision Shoulder Screws

Fit into the tightest spaces with screws that won't rust. The head on these screws is about one-third the height of standard-profile screw heads to prevent snags on nearby components. However, they're not suited for high-strength fastening. They are engineered to tight tolerances for assemblies that require smooth and accurate movement, with shoulder diameters twice as precise as those on standard-fit screws.

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		1-4	5-Up
18-8 Stainless Steel







				3 mm Diameter Shoulder (-0.03 mm to 0 mm Tolerance)

				2.5	M2 × 0.4 mm	4	5	0.7	1.5	95,000	000000000	00000	00000


				3	M2 × 0.4 mm	4	5	0.7	1.5	95,000	000000000	0000	0000
				4	M2 × 0.4 mm	4	5	0.7	1.5	95,000	000000000	0000	0000
				5	M2 × 0.4 mm	4	5	0.7	1.5	95,000	000000000	0000	0000
				6	M2 × 0.4 mm	4	5	0.7	1.5	95,000	000000000	0000	0000
				8	M2 × 0.4 mm	4	5	0.7	1.5	95,000	000000000	0000	0000

Stainless Steel Hex-Drive Precision Shoulder Screws

Our go-to choice for assemblies that require smooth, accurate movement. These screws are engineered for tight tolerances, with shoulder diameters twice as precise as those on standard-fit screws. They're made of stainless steel, so they won't rust, though they're not as strong as their alloy steel counterparts.

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.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these screws won't degrade when exposed to harsh weather, salt water, and most chemicals.

				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







				3 mm Diameter Shoulder (-0.038 mm to -0.013 mm Tolerance)

				2	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	00000	00000


				3	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				4	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				5	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				6	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				7	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				8	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				10	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				12	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				14	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				16	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000


				18	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				20	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
				25	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000


				Highly Corrosion-Resistant 316 Stainless Steel







								3 mm Diameter Shoulder (-0.025 mm to 0 mm Tolerance)

								2	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000


								3	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
								4	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
								5	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	0000	0000
								6	M2 × 0.4 mm	4	5	2	1.5	70,000	Digital	000000000	0000	0000
								8	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	00000	0000
								10	M2 × 0.4 mm	4	5	2	1.5	70,000	—	000000000	00000	0000

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







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

				4.00 to 49.75	M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	000000	000000	00000


				50.00 to 99.75	M2 × 0.4 mm	4	5	2	2	70,000	Digital	000000000	00000	00000	0000




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

						4.00 to 49.75	M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	00000	0000


						50.00 to 99.75	M2 × 0.4 mm	5	6	3	2	70,000	Digital	000000000	00000	00000	00000