2-56 Shoulder Bolts | McMaster-Carr

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Tensile Strength

60,000 psi to 80,999 psi

100,000 psi or greater

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1/16"

5/64"

Finish

Black Oxide

DFARS Specialty Metals

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Unified Standard Class 2A

Unified Standard Class 3A

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Compliant

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Compliant

Export Control Classification Number (ECCN)

EAR99

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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	91259A455	00000	00000


				3/16"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	91259A456	0000	0000
				1/4"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	91259A504	0000	0000
				5/16"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	91259A458	0000	0000
				3/8"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	91259A459	0000	0000
				1/2"	2-56	1/8"	3/16"	1/8"	5/64"	140,000	ASTM A108	91259A505	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				Certificate			Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Type	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	—	—	97832A231	00000	00000


				3/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A232	0000	0000
				1/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97832A233	0000	0000
				5/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A234	0000	0000
				3/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A235	0000	0000
				7/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97832A236	0000	0000
				1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A237	0000	0000
				9/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A238	0000	0000
				5/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97832A239	0000	0000
				3/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A240	0000	0000
				7/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A241	0000	0000


				1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A242	0000	0000
				5/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A243	0000	0000
				3/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A244	0000	0000
				7/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97832A245	0000	0000
				1"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97832A246	0000	0000
				1 1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A247	0000	0000
				1 1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97832A248	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	Material Certificate	Digital	97345A110	0000	0000


								3/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A130	0000	0000
								1/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A136	0000	0000
								5/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A150	0000	0000
								3/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A152	0000	0000
								7/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A156	0000	0000
								1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A175	0000	0000
								9/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A179	0000	0000
								5/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A198	0000	0000
								3/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A199	0000	0000
								7/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A200	0000	0000


								1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A210	0000	0000
								5/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A214	0000	0000
								3/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A218	0000	0000
								7/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A230	0000	0000
								1"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A235	0000	0000
								1 1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	97345A239	0000	0000
1 1/2"								2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	97345A255	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	Material Certificate	Digital	8077A151	0000	0000


								3/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A141	00000	00000
								1/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A149	0000	0000
								5/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A142	00000	00000
								3/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A154	0000	0000
								7/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A143	00000	00000
								1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A148	00000	0000
								9/32"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A144	00000	00000
								5/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A156	00000	0000
								3/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A153	00000	0000
								7/16"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A158	00000	0000


								1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A147	00000	0000
								5/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A155	00000	0000
								3/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	—	—	8077A152	00000	0000
								7/8"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A157	00000	00000
								1"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A139	00000	00000
								1 1/4"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A146	00000	00000
								1 1/2"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	8077A145	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				Certificate			Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Type	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	—	—	94035A111	00000	00000


				3/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A112	0000	0000
				1/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Material Certificate	Digital	94035A113	0000	0000
				5/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A114	0000	0000
				3/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Material Certificate	Digital	94035A115	0000	0000
				7/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A116	0000	0000
				1/4"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A117	0000	0000
				5/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A118	0000	0000
				3/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Material Certificate	Digital	94035A119	0000	0000
				7/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A121	0000	0000
				1/2"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Material Certificate	Digital	94035A122	0000	0000


				5/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A123	0000	0000
				3/4"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	94035A124	0000	0000
				1"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	Material Certificate	Digital	94035A125	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	—	—	96126A111	0000	0000


								3/32"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A112	0000	0000
								1/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A113	0000	0000
								3/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A114	0000	0000
								1/4"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A115	0000	0000
								5/16"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A116	0000	0000
								3/8"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A117	0000	0000
								1/2"	2-56	1/8"	3/16"	1/8"	5/64"	70,000	—	—	96126A118	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				Certificate			Each
	Shoulder Lg.	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Type	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	—	—	90337A151	00000	00000


				3/32"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A152	0000	0000
				1/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	Material Certificate	Digital	90337A153	0000	0000
				5/32"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A154	0000	0000
				3/16"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	Material Certificate	Digital	90337A155	0000	0000
				1/4"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A156	0000	0000
				5/16"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	Material Certificate	Digital	90337A157	0000	0000
				3/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A158	0000	0000
				1/2"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A353	0000	0000
				5/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A354	0000	0000
				3/4"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	Material Certificate	Digital	90337A355	0000	0000


				7/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A356	0000	0000
				1"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A357	0000	0000
				1 1/8"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A358	0000	0000
				1 1/4"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A359	0000	0000
				1 1/2"	2-56	1/8"	3/16"	1/16"	5/64"	70,000	—	—	90337A361	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	90318A101	00000	00000


				3/16"	2-56	1/8"	3/16"	1/32"	5/64"	70,000	90318A560	0000	0000
				1/4"	2-56	1/8"	3/16"	1/32"	1/16"	70,000	90318A102	0000	0000
				5/16"	2-56	1/8"	3/16"	1/32"	5/64"	70,000	90318A570	0000	0000
				3/8"	2-56	1/8"	3/16"	1/32"	1/16"	70,000	90318A103	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	92381A101	00000	00000


				1/4"	2-56	1/8"	3/16"	1/32"	70,000	92381A102	0000	0000
				3/8"	2-56	1/8"	3/16"	1/32"	70,000	92381A103	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	99154A391	00000	00000


				3/32"	2-56	1/8"	3/16"	1/16"	70,000	99154A392	0000	0000
				1/8"	2-56	1/8"	3/16"	1/16"	70,000	99154A301	0000	0000
				5/32"	2-56	1/8"	3/16"	1/16"	70,000	99154A393	0000	0000
				3/16"	2-56	1/8"	3/16"	1/16"	70,000	99154A394	0000	0000
				1/4"	2-56	1/8"	3/16"	1/16"	70,000	99154A306	0000	0000
				5/16"	2-56	1/8"	3/16"	1/16"	70,000	99154A395	0000	0000
				3/8"	2-56	1/8"	3/16"	1/16"	70,000	99154A313	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				Certificate			Each
	Choose a Shoulder Length	Thread Size	Thread Lg.	Dia.	Ht.	Drive Size	Tensile Strength, psi	Type	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	Material Certificate	Digital	92183A112	000000	000000	00000


				2.00" to 3.99"	2-56	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	92183A122	00000	00000	0000