Socket Head Screws

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Expected delivery: Wed, Nov 18

Socket head screws are driven with a hex key, so they fit in tight spaces where a wrench cannot swing. Machine builders, tool and die shops and maintenance crews use them on fixtures, dies, motor mounts and guards. This section includes standard socket head cap screws, low head cap screws, button head and flat head socket screws, shoulder screws and set screws, in UNC, UNF and metric threads.

What to check before you order

Material. Black-oxide alloy steel is heat treated for high strength and is the usual choice for machinery. 18-8 and 316 stainless resist corrosion but are not as strong as alloy.
Head style. Standard heads give the most drive strength. Button heads have a low, rounded profile for guards and panels. Flat heads sit flush in an 82 degree countersink on inch screws and 90 degrees on metric.
Drive size. Check that your hex key set covers the drive. A worn key strips the socket, so replace keys that are rounded.
Set screw point. Cup point is the common choice for gripping a shaft. Flat point is used where the shaft will be adjusted often, and dog point locates in a hole or groove.

Common questions

How is a flat head socket screw measured?

Overall, from the top of the head to the tip, because the head sits flush with the surface.

See the fasteners category, machine screws for slotted and Phillips styles, and our thread sizes guide.

Socket Head Screws: page 21

Approved Vendor 3/8" x 3-1/2" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22292 $6.49
Approved Vendor 3/8" x 3/4" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1738 $7.94
Approved Vendor 3/8" x 3/4" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22300 $2.60
Approved Vendor 3/8" x 4" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1749 $27.29
Approved Vendor 3/8" x 4" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22323 $7.67
Approved Vendor 3/8" x 5" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22324 $14.39
Approved Vendor 3/8" x 5/8" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1737 $7.45
Approved Vendor 3/8" x 5/8" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22331 $2.35
Approved Vendor 3/8" x 6" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1750 $71.17
Approved Vendor 3/8" x 6" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22343 $20.70
Approved Vendor 3/8"-16x1" Brass Button Head Socket Cap Screw SKU 22496 $6.83
Approved Vendor 3/8"-16x1" Brass Cup Point Socket Set Screws SKU 22497 $4.36
Approved Vendor 3/8"-16x1" Brass Flat Head Socket Cap Screw SKU 22498 $6.02
Approved Vendor 3/8"-16x1" Brass Socket Head Cap Screw SKU 22499 $7.41
Approved Vendor 3/8"-16x1" Low Socket Head Cap Screws Thermal Black Oxide SKU 22503 $1.53
Approved Vendor 3/8"-16x1-1/2" Brass Flat Head Socket Cap Screw SKU 22508 $7.81
Approved Vendor 3/8"-16x1-1/2" Brass Socket Head Cap Screw SKU 22509 $7.18
Approved Vendor 3/8"-16x1-1/2" Low Socket Head Cap Screws Thermal Black Oxide SKU 22512 $1.97
Approved Vendor 3/8"-16x1-1/4" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2370 $2.18
Approved Vendor 3/8"-16x1-1/4" Brass Flat Head Socket Cap Screw SKU 22516 $7.12
Approved Vendor 3/8"-16x1-1/4" Brass Socket Head Cap Screw SKU 22517 $10.24
Approved Vendor 3/8"-16x1-1/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 22520 $1.72
Approved Vendor 3/8"-16x1-3/4" Brass Flat Head Socket Cap Screw SKU 22524 $11.78
Approved Vendor 3/8"-16x1-3/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 22526 $2.14
Approved Vendor 3/8"-16x1/2" Brass Cup Point Socket Set Screws SKU 22532 $2.58
Approved Vendor 3/8"-16x1/2" Low Socket Head Cap Screws Thermal Black Oxide SKU 22534 $1.07
Approved Vendor 3/8"-16x2" Brass Flat Head Socket Cap Screw SKU 22541 $10.88
Approved Vendor 3/8"-16x2" Brass Socket Head Cap Screw SKU 22542 $29.65
Approved Vendor 3/8"-16x2" Low Socket Head Cap Screws Thermal Black Oxide SKU 22545 $2.39
Approved Vendor 3/8"-16x2-1/2" Brass Flat Head Socket Cap Screw SKU 22549 $13.15
Approved Vendor 3/8"-16x2-1/2" Brass Socket Head Cap Screw SKU 22550 $33.58
Approved Vendor 3/8"-16x2-1/2" Low Socket Head Cap Screws Thermal Black Oxide SKU 22553 $2.93
Approved Vendor 3/8"-16x3" Brass Socket Head Cap Screw SKU 22569 $34.54
Approved Vendor 3/8"-16x3" Low Socket Head Cap Screws Thermal Black Oxide SKU 22572 $3.44
Approved Vendor 3/8"-16x3/4" Brass Button Head Socket Cap Screw SKU 22584 $5.80
Approved Vendor 3/8"-16x3/4" Brass Flat Head Socket Cap Screw SKU 22585 $5.78
Approved Vendor 3/8"-16x3/4" Brass Socket Head Cap Screw SKU 22586 $6.14
Approved Vendor 3/8"-16x3/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 22588 $1.28
Approved Vendor 3/8"-16x5/8" Brass Cup Point Socket Set Screws SKU 22614 $2.95
Approved Vendor 3/8"-16x7/8" Brass Socket Head Cap Screw SKU 22624 $20.63
Approved Vendor 3/8-16x1" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2694 $0.83
Approved Vendor 3/8-16x1" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 22848 $8.48
Approved Vendor 3/8-16x1" Alloy Button Head Socket Cap Screws Black Oxide SKU 22850 $0.63
Approved Vendor 3/8-16x1" Alloy Button Head Socket Cap Screws Zinc Clear SKU 22851 $1.14
Approved Vendor 3/8-16x1" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 22853 $0.67
Approved Vendor 3/8-16x1" Alloy Flat Head Socket Cap Screws Black Oxide SKU 22854 $0.63
Approved Vendor 3/8-16x1" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 22855 $1.06
Approved Vendor 3/8-16x1" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 22857 $1.32

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