M1.6 Shoulder Bolts | McMaster-Carr

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51 Products

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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

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Withstand heavy loads and high stress without breaking

12 products

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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	000000000	00000	00000


				5	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				6	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				8	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				10	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				12	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				14	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				16	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				18	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				20	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000
				25	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	0000	0000


				30	M1.6 × 0.35 mm	3	5	2	1.5	Not Rated	ASTM A108	000000000	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						Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Tensile Strength	Specs. Met	Material Certificate 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	—	000000000	00000	00000


				1	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				1.5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				2	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				2.5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				3	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				4	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				5	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				6	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	Digital	000000000	0000	0000
				8	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000
				10	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	000000000	0000	0000


				12	M1.6 × 0.35 mm	3.2	3	1	Not Rated	DIN 923	—	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.

				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	000000000	00000	00000


				3	M1.6 × 0.35 mm	3	4	2	1.5	70,000	000000000	0000	0000
				4	M1.6 × 0.35 mm	3	4	2	1.5	70,000	000000000	0000	0000
				6	M1.6 × 0.35 mm	3	4	2	1.5	70,000	000000000	0000	0000
				8	M1.6 × 0.35 mm	3	4	2	1.5	70,000	000000000	0000	0000
				10	M1.6 × 0.35 mm	3	4	2	1.5	70,000	000000000	0000	0000
				12	M1.6 × 0.35 mm	3	4	2	1.5	70,000	000000000	0000	0000
				16	M1.6 × 0.35 mm	3	4	2	1.5	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, mm					Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Tensile Strength, psi	Specs. Met		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	000000000	00000	00000


				4	M1.6 × 0.35 mm	2.5	4	1	70,000	DIN 923	000000000	0000	0000
				5	M1.6 × 0.35 mm	2.5	4	1	70,000	DIN 923	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, 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)

				4	M1.6 × 0.35 mm	4	5	2	2	70,000	—	000000000	00000	00000


				5	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
				6	M1.6 × 0.35 mm	4	5	2	2	70,000	—	000000000	0000	0000
				8	M1.6 × 0.35 mm	4	5	2	2	70,000	—	000000000	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	—	000000000	0000	0000


								5	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
								6	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
								8	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	0000	0000
								10	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	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	Digital	000000000	0000	0000


												5	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	00000	0000
												6	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	00000	0000
												8	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	00000	00000
												10	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	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						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	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	000000	000000	00000


				50.00 to 99.75	M1.6 × 0.35 mm	4	5	2	2	70,000	Digital	000000000	00000	00000	0000