Countersunk Head Shoulder Screws

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Fastener Head Type

Flat

Headless

System of Measurement

Shoulder Diameter

Shoulder Length

Thread Size

Thread Length

Drive Style

Thread Type

Head Diameter

Shoulder Fit

Material

Thread Spacing

Head Height

Thread Pitch

Hardness

Thread Fit

Unified Standard Class 3A

Tensile Strength

Drive Size

Thread Direction

DFARS Specialty Metals

Compliant

Exempt

Head Texture

Smooth

Minimum Shear Strength

35,000 psi

Not Rated

Relative Thread Length

Standard

REACH

Compliant

Export Control Classification Number (ECCN)

RoHS

99 Products

Fastener Head Type

Headless

Flush mount for clearance in tight spaces or use as aligning pins

55 products

Flat

Flush mount to prevent snags around moving parts

44 products

Performance

Precision

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

55 products

High Strength

Withstand heavy loads and high stress without breaking

55 products

Steel Headless Slotted Precision Shoulder Screws

With no head, you can flush mount these screws in countersunk holes and tight spaces. You can also use them as pins for aligning parts. 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.

	Shoulder Lg.	Thread Size	Thread Lg.	Tensile Strength	Specs. Met	Pkg. Qty.		Pkg.
Alloy Steel







				1/8" Diameter Shoulder (-0.001" to 0" Tolerance)

				1/8"	4-40	5/32"	Not Rated	—	1	000000000	00000


				1/4"	4-40	5/32"	Not Rated	—	1	000000000	0000
				3/8"	4-40	5/32"	Not Rated	—	1	000000000	0000
				1/2"	4-40	5/32"	Not Rated	—	1	000000000	0000
				5/8"	4-40	5/32"	Not Rated	—	1	000000000	0000
				3/4"	4-40	5/32"	Not Rated	—	1	000000000	0000




						3/16" Diameter Shoulder (-0.001" to 0" Tolerance)

						1/8"	8-32	3/16"	Not Rated	—	1	000000000	0000


						1/4"	8-32	3/16"	Not Rated	—	1	000000000	0000
						3/8"	8-32	3/16"	Not Rated	—	1	000000000	0000
						1/2"	8-32	3/16"	Not Rated	—	1	000000000	0000
						5/8"	8-32	3/16"	Not Rated	—	1	000000000	0000
						3/4"	8-32	3/16"	Not Rated	—	1	000000000	0000




								1/4" Diameter Shoulder (-0.001" to 0" Tolerance)

								1/8"	10-32	1/4"	Not Rated	—	1	000000000	0000


								1/4"	10-32	1/4"	Not Rated	—	1	000000000	0000
								3/8"	10-32	1/4"	Not Rated	—	1	000000000	0000
								1/2"	10-32	1/4"	Not Rated	—	1	000000000	0000
								5/8"	10-32	1/4"	Not Rated	—	1	000000000	0000
								3/4"	10-32	1/4"	Not Rated	—	1	000000000	0000




										5/16" Diameter Shoulder (-0.001" to 0" Tolerance)

										1/4"	1/4"-20	7/16"	Not Rated	—	1	000000000	0000


										3/8"	1/4"-20	7/16"	Not Rated	—	1	000000000	0000
										1/2"	1/4"-20	7/16"	Not Rated	—	1	000000000	0000
										5/8"	1/4"-20	7/16"	Not Rated	—	1	000000000	0000
										3/4"	1/4"-20	7/16"	Not Rated	—	1	000000000	0000
										1"	1/4"-20	7/16"	Not Rated	—	1	000000000	0000




												3/8" Diameter Shoulder (-0.001" to 0" Tolerance)

1/4"	5/16"-18											1/2"	Not Rated	—	1	000000000	0000


3/8"	5/16"-18											1/2"	Not Rated	—	1	000000000	0000
1/2"	5/16"-18	1/2"										Not Rated	—	1	000000000	0000
5/8"	5/16"-18	1/2"	Not Rated									—	1	000000000	0000
3/4"	5/16"-18	1/2"	Not Rated									—	1	000000000	0000
1"	5/16"-18	1/2"	Not Rated									—	1	000000000	0000




		1/2" Diameter Shoulder (-0.001" to 0" Tolerance)

		1/4"	3/8"-16									5/8"	Not Rated	—	1	000000000	0000


		3/8"	3/8"-16									5/8"	Not Rated	—	1	000000000	0000
		1/2"	3/8"-16									5/8"	Not Rated	—	1	000000000	0000
		5/8"	3/8"-16	5/8"								Not Rated	—	1	000000000	00000
		3/4"	3/8"-16	5/8"	Not Rated							—	1	000000000	00000
		1"	3/8"-16	5/8"	Not Rated							—	1	000000000	00000




				4 mm Diameter Shoulder (-0.03 mm to 0 mm Tolerance)

				3 mm	M3 × 0.5 mm							4.5 mm	Not Rated	DIN 927	10	000000000	0000


				4 mm	M3 × 0.5 mm							4.5 mm	Not Rated	DIN 927	10	000000000	00000
				5 mm	M3 × 0.5 mm							4.5 mm	Not Rated	DIN 927	10	000000000	00000
				6 mm	M3 × 0.5 mm							4.5 mm	Not Rated	DIN 927	10	000000000	0000
				8 mm	M3 × 0.5 mm	4.5 mm						Not Rated	DIN 927	10	000000000	0000




						5.5 mm Diameter Shoulder (-0.03 mm to 0 mm Tolerance)

						4 mm	M4 × 0.7 mm					6 mm	Not Rated	DIN 927	5	000000000	0000


						5 mm	M4 × 0.7 mm					6 mm	Not Rated	DIN 927	5	000000000	0000
						6 mm	M4 × 0.7 mm					6 mm	Not Rated	DIN 927	5	000000000	0000
						8 mm	M4 × 0.7 mm					6 mm	Not Rated	DIN 927	5	000000000	0000
						10 mm	M4 × 0.7 mm					6 mm	Not Rated	DIN 927	5	000000000	0000




								6.5 mm Diameter Shoulder (-0.036 mm to 0 mm Tolerance)

								5 mm	M5 × 0.8 mm			7 mm	Not Rated	DIN 927	10	000000000	0000


								6 mm	M5 × 0.8 mm			7 mm	Not Rated	DIN 927	10	000000000	00000
								8 mm	M5 × 0.8 mm			7 mm	Not Rated	DIN 927	5	000000000	0000
								10 mm	M5 × 0.8 mm			7 mm	Not Rated	DIN 927	5	000000000	0000
								12 mm	M5 × 0.8 mm			7 mm	Not Rated	DIN 927	5	000000000	0000




										8 mm Diameter Shoulder (-0.036 mm to 0 mm Tolerance)

										8 mm	M6 × 1 mm	8 mm	Not Rated	DIN 927	5	000000000	0000


										10 mm	M6 × 1 mm	8 mm	Not Rated	DIN 927	5	000000000	0000
										12 mm	M6 × 1 mm	8 mm	Not Rated	DIN 927	5	000000000	0000




										10 mm Diameter Shoulder (-0.07 mm to 0 mm Tolerance)

										16 mm	M8 × 1.25 mm	11 mm	Not Rated	DIN 927	1	000000000	0000

Stainless Steel Flat Head Hex-Drive Shoulder Screws

Create a smooth surface to avoid snags or catches in tight assemblies or around moving machinery. These screws have a flat head that sits flush with your surface or just below it.

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.	Countersink Angle	Dia.	Ht.	Drive Size	Tensile Strength, psi		1-4	5-Up
18-8 Stainless Steel







				1/4" Diameter Shoulder (-0.004" to -0.002" Tolerance)

				1/4"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	00000	00000


				3/8"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	0000	0000
				1/2"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	0000	0000
				5/8"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	0000	0000
				3/4"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	0000	0000
				1"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	00000	0000
				1 1/4"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	00000	00000
				1 1/2"	10-24	3/8"	82°	0.531"	0.161"	5/32"	70,000	000000000	00000	00000




						5/16" Diameter Shoulder (-0.004" to -0.002" Tolerance)

						1/4"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	0000	0000


						3/8"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	0000	0000
						1/2"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	00000	0000
						5/8"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	00000	0000
						3/4"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	00000	0000
						1"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	00000	00000
						1 1/4"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	00000	00000
						1 1/2"	1/4"-20	7/16"	82°	0.656"	0.198"	3/16"	70,000	000000000	00000	00000




								3/8" Diameter Shoulder (-0.004" to -0.002" Tolerance)

								1/4"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	0000	0000


								3/8"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	0000
								1/2"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	0000
								5/8"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	0000
								3/4"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	00000
								1"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	00000
								1 1/4"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	00000
								1 1/2"	5/16"-18	1/2"	82°	0.781"	0.234"	7/32"	70,000	000000000	00000	00000




										1/2" Diameter Shoulder (-0.004" to -0.002" Tolerance)

										3/8"	3/8"-16	5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	0000


										1/2"	3/8"-16	5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	0000
										5/8"	3/8"-16	5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	00000
										3/4"	3/8"-16	5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	00000
										1"	3/8"-16	5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	00000
1 1/4"										3/8"-16	5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	00000
1 1/2"	3/8"-16									5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	00000
2"	3/8"-16									5/8"	82°	0.937"	0.251"	5/16"	70,000	000000000	00000	00000

Shoulder Shims

Shoulder

Lengthening

Shoulder Lengthening—Wiggle over threads to add space or increase travel along the shoulder of screws. Stack these shims to get the exact spacing you need.

		Shoulder Lengthening
	Thk.	For Screw Size	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				For 1/4" Diameter Shoulder

				0.005"	No. 10	50	000000000	000000


				0.016"	No. 10	50	000000000	00000
				0.03"	No. 10	25	000000000	0000




						For 5/16" Diameter Shoulder

						0.005"	1/4"	50	000000000	00000


						0.016"	1/4"	25	000000000	0000
						0.03"	1/4"	25	000000000	0000




								For 3/8" Diameter Shoulder

								0.005"	5/16"	50	000000000	00000


								0.016"	5/16"	25	000000000	00000
								0.03"	5/16"	25	000000000	00000




										For 1/2" Diameter Shoulder

										0.005"	3/8"	25	000000000	00000


										0.016"	3/8"	25	000000000	00000
										0.03"	3/8"	25	000000000	00000