2-56 Shoulder Bolts | McMaster-Carr

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35,000 psi

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116 Products

Performance

Precision

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

54 products

Made-to-Order

Request the exact shoulder length you're looking for

2 products

Performance

High Strength

Withstand heavy loads and high stress without breaking

6 products

Wear Resistant

Withstand repeated friction without breaking down

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







				3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				1/8"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	000000000	00000	00000


				3/16"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	000000000	0000	0000
				1/4"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	000000000	0000	0000
				5/16"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	000000000	0000	0000
				3/8"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	000000000	0000	0000
				1/2"	2-56	1/8"	3/16"	1/8"	5/64"	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.

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







				3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				1/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	00000	00000


				3/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				1/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				5/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				3/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				7/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				9/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				5/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				3/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				7/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000


				1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				5/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				3/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				7/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				1"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				1 1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
				1 1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	00000	0000


				Highly Corrosion-Resistant 316 Stainless Steel







								3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

								1/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	0000	0000


								3/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	0000	0000
								1/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	0000	0000
								5/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								3/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								7/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								9/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								5/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								3/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								7/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	0000	0000


								1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								5/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								3/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								7/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								1"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	0000	0000
								1 1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	0000	0000
1 1/2"								2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	000000000	00000	00000


Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel







								3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

								1/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	0000	0000


								3/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								1/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	0000	0000
								5/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								3/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	0000	0000
								7/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	0000
								9/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								5/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	0000
								3/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	0000
								7/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	0000


								1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	0000
								5/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	0000
								3/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	00000000	00000	0000
								7/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								1"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								1 1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000
								1 1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	00000000	00000	00000

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







				3/32" Diameter Shoulder (-0.001" to 0" Tolerance)

				1/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	00000	00000


				3/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				1/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Digital	000000000	0000	0000
				5/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				3/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Digital	000000000	0000	0000
				7/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				1/4"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				5/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				3/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Digital	000000000	0000	0000
				7/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				1/2"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Digital	000000000	0000	0000


				5/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				3/4"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
				1"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Digital	000000000	0000	0000


				Highly Corrosion-Resistant 316 Stainless Steel







								3/32" Diameter Shoulder (-0.001" to 0" Tolerance)

								1/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000


								3/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
								1/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
								3/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
								1/4"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
								5/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
								3/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	000000000	0000	0000
								1/2"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	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.

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					Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi		1-4	5-Up
Highly Corrosion-Resistant 316 Stainless Steel







				3/32" Diameter Shoulder (-0.001" to 0" Tolerance)

				1/8"	2-56	1/8"	3/16"	1/32"	1/16"	70,000	000000000	00000	00000


				3/16"	2-56	1/8"	3/16"	1/32"	5/64"	70,000	000000000	0000	0000
				1/4"	2-56	1/8"	3/16"	1/32"	1/16"	70,000	000000000	0000	0000
				5/16"	2-56	1/8"	3/16"	1/32"	5/64"	70,000	000000000	0000	0000
				3/8"	2-56	1/8"	3/16"	1/32"	1/16"	70,000	000000000	0000	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						Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Material Certificate Form		1-4	5-Up
18-8 Stainless Steel







				3/32" Diameter Shoulder (-0.001" to 0" Tolerance)

				1/16"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	00000	00000


				3/32"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				1/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				5/32"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				3/16"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	Digital	000000000	0000	0000
				1/4"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				5/16"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	Digital	000000000	0000	0000
				3/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				1/2"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				5/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				3/4"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000


				7/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				1"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				1 1/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				1 1/4"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000
				1 1/2"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	000000000	0000	0000

Stainless Steel Ultra-Low-Profile Slotted Precision Shoulder Screws

Fit these slotted screws into the tightest spaces in corrosive environments. The head 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. Hand-tighten with a slotted screwdriver to avoid damaging the drive.

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				Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Tensile Strength, psi		1-4	5-Up
Highly Corrosion-Resistant 316 Stainless Steel







				3/32" Diameter Shoulder (-0.001" to 0" Tolerance)

				1/8"	2-56	1/8"	3/16"	1/32"	70,000	000000000	00000	00000


				1/4"	2-56	1/8"	3/16"	1/32"	70,000	000000000	0000	0000
				3/8"	2-56	1/8"	3/16"	1/32"	70,000	000000000	0000	0000

Stainless Steel Low-Profile Slotted Precision Shoulder Screws

Fit these slotted screws into tight spaces in corrosive environments. The head 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. Hand-tighten with a slotted screwdriver to avoid damaging the drive.

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				Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Tensile Strength, psi		1-4	5-Up
18-8 Stainless Steel







				3/32" Diameter Shoulder (-0.001" to 0" Tolerance)

				1/16"	2-56	1/8"	3/16"	1/16"	70,000	000000000	00000	00000


				3/32"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	0000
				1/8"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	0000
				5/32"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	0000
				3/16"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	0000
				1/4"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	0000
				5/16"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	0000
				3/8"	2-56	1/8"	3/16"	1/16"	70,000	000000000	0000	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						Each
	Choose a Shoulder Length	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Material Certificate Form		1-4	5-9	10-Up
18-8 Stainless Steel







				3/32" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				0.13" to 1.99"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	000000	000000	00000


				2.00" to 3.99"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Digital	000000000	00000	00000	0000