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 14

Approved Vendor 1/4" x 2-1/2" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1718 $10.07
Approved Vendor 1/4" x 2-1/4" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1717 $9.54
Approved Vendor 1/4" x 2-3/4" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1719 $11.16
Approved Vendor 1/4" x 3" x #10-24 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16170 $7.31
Approved Vendor 1/4" x 3" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1720 $12.04
Approved Vendor 1/4" x 3/4" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1708 $4.77
Approved Vendor 1/4" x 3/4" x #10-24 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16178 $1.97
Approved Vendor 1/4" x 3/4" x #10-32 Allen Socket Stainless Steel Shoulder Bolts SKU 1709 $5.42
Approved Vendor 1/4" x 3/4" x #10-32 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16179 $2.77
Approved Vendor 1/4" x 3/8" x #10-24 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16198 $1.80
Approved Vendor 1/4" x 3/8" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1702 $3.72
Approved Vendor 1/4" x 3/8" x #10-32 Allen Socket Stainless Steel Shoulder Bolts SKU 1703 $4.22
Approved Vendor 1/4" x 3/8" x #10-32 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16199 $2.54
Approved Vendor 1/4" x 5/16" x #10-24 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16208 $2.19
Approved Vendor 1/4" x 5/16" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1700 $4.36
Approved Vendor 1/4" x 5/16" x #10-32 Allen Socket Stainless Steel Shoulder Bolts SKU 1701 $3.95
Approved Vendor 1/4" x 5/16" x #10-32 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16209 $2.49
Approved Vendor 1/4" x 5/8" x #10-24 Allen Socket Stainless Steel Shoulder Bolts SKU 1706 $4.31
Approved Vendor 1/4" x 5/8" x #10-24 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16217 $1.93
Approved Vendor 1/4" x 5/8" x #10-32 Allen Socket Stainless Steel Shoulder Bolts SKU 1707 $4.89
Approved Vendor 1/4" x 5/8" x #10-32 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 16218 $2.72
Approved Vendor 1/4"-20x1" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2367 $0.83
Approved Vendor 1/4"-20x1" Brass Flat Head Socket Cap Screw SKU 16382 $3.11
Approved Vendor 1/4"-20x1" Brass Socket Head Cap Screw SKU 16385 $4.32
Approved Vendor 1/4"-20x1" Low Socket Head Cap Screws Thermal Black Oxide SKU 16390 $0.58
Approved Vendor 1/4"-20x1-1/2" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2369 $1.13
Approved Vendor 1/4"-20x1-1/2" Brass Flat Head Socket Cap Screw SKU 16404 $4.14
Approved Vendor 1/4"-20x1-1/2" Brass Socket Head Cap Screw SKU 16406 $4.41
Approved Vendor 1/4"-20x1-1/2" Low Socket Head Cap Screws Thermal Black Oxide SKU 16410 $0.78
Approved Vendor 1/4"-20x1-1/4" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2368 $0.98
Approved Vendor 1/4"-20x1-1/4" Brass Flat Head Socket Cap Screw SKU 16419 $3.47
Approved Vendor 1/4"-20x1-1/4" Brass Socket Head Cap Screw SKU 16422 $11.47
Approved Vendor 1/4"-20x1-1/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 16426 $0.67
Approved Vendor 1/4"-20x1-3/4" Brass Socket Head Cap Screw SKU 16435 $13.27
Approved Vendor 1/4"-20x1-3/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 16437 $1.58
Approved Vendor 1/4"-20x1/2" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2364 $0.65
Approved Vendor 1/4"-20x1/2" Brass Button Head Socket Cap Screw SKU 16446 $2.25
Approved Vendor 1/4"-20x1/2" Brass Flat Head Socket Cap Screw SKU 16447 $2.13
Approved Vendor 1/4"-20x1/2" Brass Socket Head Cap Screw SKU 16450 $2.48
Approved Vendor 1/4"-20x1/2" Low Socket Head Cap Screws Thermal Black Oxide SKU 16453 $0.46
Approved Vendor 1/4"-20x2" Brass Socket Head Cap Screw SKU 16472 $4.07
Approved Vendor 1/4"-20x2-1/2" Brass Socket Head Cap Screw SKU 16481 $16.11
Approved Vendor 1/4"-20x3" Brass Socket Head Cap Screw SKU 16493 $15.83
Approved Vendor 1/4"-20x3/4" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2366 $0.72
Approved Vendor 1/4"-20x3/4" Brass Button Head Socket Cap Screw SKU 16512 $3.41
Approved Vendor 1/4"-20x3/4" Brass Cup Point Socket Set Screws SKU 16513 $1.99
Approved Vendor 1/4"-20x3/4" Brass Flat Head Socket Cap Screw SKU 16514 $2.74
Approved Vendor 1/4"-20x3/4" Brass Socket Head Cap Screw SKU 16517 $3.04

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