M1.6 Shoulder Bolts | McMaster-Carr

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51 Products

Performance

Precision

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

23 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

12 products

Wear Resistant

Withstand repeated friction without breaking down

12 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	Specs. Met		1-4	5-Up
Black-Oxide Alloy Steel







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

				4	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A941	00000	00000


				5	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A942	0000	0000
				6	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A943	0000	0000
				8	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A944	0000	0000
				10	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A945	0000	0000
				12	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A946	0000	0000
				14	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A947	0000	0000
				16	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A948	0000	0000
				18	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A949	0000	0000
				20	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A950	0000	0000
				25	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A951	0000	0000


				30	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	92981A952	0000	0000

Stainless Steel Slotted Precision Shoulder Screws

Use these slotted screws in assemblies that require smooth, accurate movement. They're 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. 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, mm				Certificate			Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Tensile Strength	Specs. Met	Type	Form		1-4	5-Up
18-8 Stainless Steel







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

				0.5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A211	00000	00000


				1	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A212	0000	0000
				1.5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A213	0000	0000
				2	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A214	0000	0000
				2.5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A215	0000	0000
				3	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A216	0000	0000
				4	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A217	0000	0000
				5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A218	0000	0000
				6	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	Material Certificate	Digital	90270A219	0000	0000
				8	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A221	0000	0000
				10	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	—	90270A222	0000	0000


				12	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	Material Certificate	Digital	90270A223	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.

				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







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

				2.5	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A711	00000	00000


				3	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A712	0000	0000
				4	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A713	0000	0000
				6	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A714	0000	0000
				8	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A715	0000	0000
				10	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A716	0000	0000
				12	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A717	0000	0000
				16	M1.6 × 0.35 mm	3	4	2	1.5	70,000	90278A718	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, mm				Certificate			Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Tensile Strength, psi	Specs. Met	Type	Form		1-4	5-Up
18-8 Stainless Steel







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

				2	M1.6 × 0.35 mm	2.5	4	1	70,000	DIN 923	Material Certificate	Digital	97307A111	00000	00000


				4	M1.6 × 0.35 mm	2.5	4	1	70,000	DIN 923	—	—	97307A112	0000	0000
				5	M1.6 × 0.35 mm	2.5	4	1	70,000	DIN 923	—	—	97307A113	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, mm				Certificate			Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Type	Form		1-4	5-Up
18-8 Stainless Steel







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

				4	M1.6 × 0.35 mm	4	5	2	2	70,000	—	—	90265A101	00000	00000


				5	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90265A102	0000	0000
				6	M1.6 × 0.35 mm	4	5	2	2	70,000	—	—	90265A103	0000	0000
				8	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90265A104	0000	0000


				Highly Corrosion-Resistant 316 Stainless Steel







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

								4	M1.6 × 0.35 mm	4	5	2	2	70,000	—	—	90269A452	0000	0000


								5	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A456	0000	0000
								6	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A431	0000	0000
								8	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A434	0000	0000
								10	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A437	00000	0000


								Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel







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

												4	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A443	0000	0000


												5	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A446	00000	0000
												6	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A449	00000	0000
												8	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A453	00000	00000
												10	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	90269A457	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				Certificate			Each
	Choose a Shoulder Length, mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Type	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	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	93856A111	000000	000000	00000


				50.00 to 99.75	M1.6 × 0.35 mm	4	5	2	2	70,000	Material Certificate	Digital	93856A121	00000	00000	0000