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 20

Approved Vendor 1/4-28x5/8" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17399 $0.33
Approved Vendor 1/4-28x5/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17401 $0.22
Approved Vendor 1/4-28x5/8" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17402 $0.26
Approved Vendor 1/4-28x5/8" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17403 $0.35
Approved Vendor 1/4-28x5/8" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17405 $0.42
Approved Vendor 1/4-28x5/8" Alloy Socket Head Cap Screws Black Oxide SKU 17406 $0.28
Approved Vendor 1/4-28x5/8" Alloy Socket Head Cap Screws Zinc Clear SKU 17407 $0.38
Approved Vendor 1/4-28x5/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2614 $0.34
Approved Vendor 1/4-28x7/16" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17413 $0.18
Approved Vendor 1/4-28x7/16" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17415 $0.82
Approved Vendor 1/4-28x7/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2731 $0.55
Approved Vendor 1/4-28x7/8" Alloy Button Head Socket Cap Screws Black Oxide SKU 17416 $0.54
Approved Vendor 1/4-28x7/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17418 $0.39
Approved Vendor 1/4-28x7/8" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17419 $0.45
Approved Vendor 1/4-28x7/8" Alloy Socket Head Cap Screws Black Oxide SKU 17420 $0.33
Approved Vendor 1/4-28x7/8" Alloy Socket Head Cap Screws Zinc Clear SKU 17421 $0.45
Approved Vendor 1/4-28x7/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2616 $0.43
Approved Vendor 3/4-10x1-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21215 $8.69
Approved Vendor 3/4-10x1-3/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21223 $9.17
Approved Vendor 3/4-10x2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21234 $9.15
Approved Vendor 3/4-10x2-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21242 $10.92
Approved Vendor 3/4-10x2-1/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21251 $9.87
Approved Vendor 3/4-10x2-3/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21258 $11.34
Approved Vendor 3/4-10x3" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21265 $11.66
Approved Vendor 3/4-10x3-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21275 $12.92
Approved Vendor 3/4-10x3-1/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21283 $12.79
Approved Vendor 3/4-10x4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 21290 $15.54
Approved Vendor 3/8" x 1" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1739 $9.20
Approved Vendor 3/8" x 1" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22245 $2.71
Approved Vendor 3/8" x 1-1/2" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1741 $11.73
Approved Vendor 3/8" x 1-1/2" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22247 $3.28
Approved Vendor 3/8" x 1-1/4" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22251 $2.97
Approved Vendor 3/8" x 1-3/4" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1742 $12.93
Approved Vendor 3/8" x 1-3/4" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22252 $3.52
Approved Vendor 3/8" x 1-3/8" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1740 $10.43
Approved Vendor 3/8" x 1/2" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1736 $7.09
Approved Vendor 3/8" x 1/2" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22254 $2.14
Approved Vendor 3/8" x 2" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1743 $13.90
Approved Vendor 3/8" x 2" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22280 $4.03
Approved Vendor 3/8" x 2-1/2" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1745 $15.03
Approved Vendor 3/8" x 2-1/2" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22282 $4.81
Approved Vendor 3/8" x 2-1/4" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1744 $14.37
Approved Vendor 3/8" x 2-1/4" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22283 $4.48
Approved Vendor 3/8" x 2-3/4" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1746 $15.47
Approved Vendor 3/8" x 2-3/4" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22284 $5.43
Approved Vendor 3/8" x 3" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1747 $15.91
Approved Vendor 3/8" x 3" x 5/16"-18" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 22291 $5.92
Approved Vendor 3/8" x 3-1/2" x 5/16"-18 Allen Socket Stainless Steel Shoulder Bolts SKU 1748 $19.23

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