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 15

Approved Vendor 1/4"-20x3/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 16519 $0.51
Approved Vendor 1/4"-20x3/8" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2363 $0.56
Approved Vendor 1/4"-20x3/8" Brass Button Head Socket Cap Screw SKU 16532 $2.55
Approved Vendor 1/4"-20x3/8" Brass Socket Head Cap Screw SKU 16533 $6.07
Approved Vendor 1/4"-20x3/8" Low Socket Head Cap Screws Thermal Black Oxide SKU 16534 $0.45
Approved Vendor 1/4"-20x5/8" 18-8 Stainless Steel Low Head Socket Cap Screws SKU 2365 $0.67
Approved Vendor 1/4"-20x5/8" Brass Button Head Socket Cap Screw SKU 16551 $2.59
Approved Vendor 1/4"-20x5/8" Brass Cup Point Socket Set Screws SKU 16552 $1.70
Approved Vendor 1/4"-20x5/8" Brass Flat Head Socket Cap Screw SKU 16553 $2.57
Approved Vendor 1/4"-20x5/8" Brass Socket Head Cap Screw SKU 16554 $3.31
Approved Vendor 1/4"-20x5/8" Low Socket Head Cap Screws Thermal Black Oxide SKU 16555 $0.48
Approved Vendor 1/4"-20x7/8" Brass Flat Head Socket Cap Screw SKU 16564 $3.69
Approved Vendor 1/4"-20x7/8" Brass Socket Head Cap Screw SKU 16565 $8.16
Approved Vendor 1/4"-20x7/8" Low Socket Head Cap Screws Thermal Black Oxide SKU 16568 $0.51
Approved Vendor 1/4"-28x5/8" Low Socket Head Cap Screws Thermal Black Oxide SKU 16684 $0.53
Approved Vendor 1/4"-28x7/8" Low Socket Head Cap Screws Thermal Black Oxide SKU 16689 $0.62
Approved Vendor 1/4-20x1" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2672 $0.30
Approved Vendor 1/4-20x1" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 16855 $3.01
Approved Vendor 1/4-20x1" Alloy Button Head Socket Cap Screws Black Oxide SKU 16857 $0.27
Approved Vendor 1/4-20x1" Alloy Button Head Socket Cap Screws Zinc Clear SKU 16858 $0.43
Approved Vendor 1/4-20x1" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 16860 $0.34
Approved Vendor 1/4-20x1" Alloy Flat Head Socket Cap Screws Black Oxide SKU 16861 $0.27
Approved Vendor 1/4-20x1" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 16862 $0.42
Approved Vendor 1/4-20x1" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 16864 $0.71
Approved Vendor 1/4-20x1" Alloy Socket Head Cap Screws Black Oxide SKU 16865 $0.21
Approved Vendor 1/4-20x1" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 16866 $0.60
Approved Vendor 1/4-20x1" Alloy Socket Head Cap Screws Zinc Clear SKU 16867 $0.44
Approved Vendor 1/4-20x1" Stainless Steel Cup Point Allen Socket Set Screw SKU 925 $0.46
Approved Vendor 1/4-20x1'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2568 $0.31
Approved Vendor 1/4-20x1-1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2674 $0.41
Approved Vendor 1/4-20x1-1/2" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 16895 $4.37
Approved Vendor 1/4-20x1-1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 16897 $0.58
Approved Vendor 1/4-20x1-1/2" Alloy Button Head Socket Cap Screws Zinc Clear SKU 16898 $0.60
Approved Vendor 1/4-20x1-1/2" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 16900 $0.52
Approved Vendor 1/4-20x1-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 16901 $0.37
Approved Vendor 1/4-20x1-1/2" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 16902 $0.58
Approved Vendor 1/4-20x1-1/2" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 16904 $2.01
Approved Vendor 1/4-20x1-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 16905 $0.30
Approved Vendor 1/4-20x1-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 16906 $0.75
Approved Vendor 1/4-20x1-1/2" Alloy Socket Head Cap Screws Zinc Clear SKU 16907 $0.61
Approved Vendor 1/4-20x1-1/2" Stainless Steel Cup Point Allen Socket Set Screw SKU 927 $0.75
Approved Vendor 1/4-20x1-1/2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2570 $0.42
Approved Vendor 1/4-20x1-1/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2673 $0.36
Approved Vendor 1/4-20x1-1/4" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 16931 $3.42
Approved Vendor 1/4-20x1-1/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 16933 $0.49
Approved Vendor 1/4-20x1-1/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 16934 $0.46
Approved Vendor 1/4-20x1-1/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 16935 $0.32
Approved Vendor 1/4-20x1-1/4" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 16936 $0.51

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