3-48 Shoulder Bolts | McMaster-Carr

Filter by

System of Measurement

Shoulder Diameter

Shoulder Length

Material

Head Diameter

Fastener Head Type

Thread Length

Head Height

Socket Head Profile

Thread Type

Relative Thread Length

Drive Style

Relative Thread Size

Shoulder Fit

Minimum Shear Strength

35,000 psi

RoHS

Compliant

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

Yes

DFARS Specialty Metals

Compliant

Export Control Classification Number (ECCN)

Hardness

Performance

REACH

Thread Fit

Unified Standard Class 3A

Head Texture

Knurled

Tensile Strength

60,000 psi to 80,999 psi

Forward

How can we improve?

41 Products

Performance

Made-to-Order

Request the exact shoulder length you're looking for

4 products

Chemical Resistant

Won't degrade when exposed to most chemicals

23 products

Relative Thread Size

Same Size

Harness superior holding strength compared to other shoulder screws

2 products

Reduced

Fit into nonstandard tapped holes in older or specialized equipment

39 products

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				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







				1/8" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				1/8"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97832A197	00000	00000


				1/4"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97832A199	0000	0000
				5/16"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97832A201	0000	0000
				3/8"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97832A202	0000	0000
				1/2"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97832A203	0000	0000
				3/4"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97832A204	0000	0000
				1"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97832A205	0000	0000


				Black-Oxide 18-8 Stainless Steel







								1/8" Diameter Shoulder (-0.004" to -0.002" Tolerance)

								1/8"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97768A123	0000	0000


								Highly Corrosion-Resistant 316 Stainless Steel







												1/8" Diameter Shoulder (-0.004" to -0.002" Tolerance)

												1/8"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97345A266	0000	0000


												5/32"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97345A269	0000	0000
												1/4"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97345A270	0000	0000
												5/16"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97345A273	0000	0000
												3/8"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97345A275	0000	0000
												1/2"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	—	—	97345A276	0000	0000
												3/4"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97345A277	00000	0000
												1"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97345A285	00000	00000
												1 1/4"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97345A290	00000	00000
												1 1/2"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	97345A291	00000	00000


												Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel







	1/8" Diameter Shoulder (-0.004" to -0.002" Tolerance)

	1/8"														3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A517	0000	0000


	5/32"	3-48													5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A512	0000	0000
	1/4"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A516	00000	0000
	5/16"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A521	00000	0000
	3/8"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A519	00000	00000
	1/2"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A515	00000	00000
	3/4"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A518	00000	00000
	1"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A511	00000	00000
	1 1/4"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A514	00000	00000
	1 1/2"	3-48	5/32"												1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	8077A513	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 1/8" Diameter Shoulder

				0.005"	No. 4	10	94773A606	00000


				0.01"	No. 4	10	94773A647	0000
				0.016"	No. 4	10	94773A679	0000
				0.02"	No. 4	10	94773A706	0000
				0.03"	No. 4	10	94773A737	0000
				0.06"	No. 4	5	94773A766	0000


				Highly Corrosion-Resistant 316 Stainless Steel







								For 1/8" Diameter Shoulder

								0.005"	No. 4	10	90792A209	0000


								0.01"	No. 4	10	90792A309	0000
								0.03"	No. 4	10	90792A409	0000

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				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"	3-48	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	92183A113	000000	000000	00000


				2.00" to 3.99"	3-48	1/8"	5/32"	3/32"	5/64"	70,000	Material Certificate	Digital	92183A123	00000	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				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







				1/8" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				0.13" to 1.99"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	92183A141	000000	000000	00000


				2.00" to 3.99"	3-48	5/32"	1/4"	1/8"	5/64"	70,000	Material Certificate	Digital	92183A151	00000	00000	0000