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 16

Approved Vendor 1/4-20x1-1/4" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 16938 $0.97
Approved Vendor 1/4-20x1-1/4" Alloy Socket Head Cap Screws Black Oxide SKU 16939 $0.25
Approved Vendor 1/4-20x1-1/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 16940 $0.66
Approved Vendor 1/4-20x1-1/4" Alloy Socket Head Cap Screws Zinc Clear SKU 16941 $0.51
Approved Vendor 1/4-20x1-1/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 926 $0.68
Approved Vendor 1/4-20x1-1/4'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2569 $0.38
Approved Vendor 1/4-20x1-1/8" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 16965 $3.90
Approved Vendor 1/4-20x1-3/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2675 $0.53
Approved Vendor 1/4-20x1-3/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 16967 $0.67
Approved Vendor 1/4-20x1-3/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 16968 $0.46
Approved Vendor 1/4-20x1-3/4" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 16969 $0.71
Approved Vendor 1/4-20x1-3/4" Alloy Socket Head Cap Screws Black Oxide SKU 16970 $0.34
Approved Vendor 1/4-20x1-3/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 16971 $0.90
Approved Vendor 1/4-20x1-3/4" Alloy Socket Head Cap Screws Zinc Clear SKU 16972 $0.68
Approved Vendor 1/4-20x1-3/4'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2571 $0.50
Approved Vendor 1/4-20x1-3/4'' 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 16990 $4.85
Approved Vendor 1/4-20x1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2668 $0.25
Approved Vendor 1/4-20x1/2" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 16992 $2.24
Approved Vendor 1/4-20x1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 16994 $0.15
Approved Vendor 1/4-20x1/2" Alloy Button Head Socket Cap Screws Zinc Clear SKU 16995 $0.27
Approved Vendor 1/4-20x1/2" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 16997 $0.17
Approved Vendor 1/4-20x1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 16998 $0.19
Approved Vendor 1/4-20x1/2" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 16999 $0.30
Approved Vendor 1/4-20x1/2" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17001 $0.37
Approved Vendor 1/4-20x1/2" Alloy Socket Head Cap Screws Black Oxide SKU 17002 $0.15
Approved Vendor 1/4-20x1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17003 $0.46
Approved Vendor 1/4-20x1/2" Alloy Socket Head Cap Screws Zinc Clear SKU 17004 $0.30
Approved Vendor 1/4-20x1/2" Stainless Steel Cup Point Allen Socket Set Screw SKU 921 $0.20
Approved Vendor 1/4-20x1/2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2564 $0.21
Approved Vendor 1/4-20x1/4" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17024 $2.31
Approved Vendor 1/4-20x1/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17025 $0.33
Approved Vendor 1/4-20x1/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17027 $0.13
Approved Vendor 1/4-20x1/4" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17029 $0.23
Approved Vendor 1/4-20x1/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 917 $0.14
Approved Vendor 1/4-20x2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2676 $0.58
Approved Vendor 1/4-20x2" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17032 $4.85
Approved Vendor 1/4-20x2" Alloy Button Head Socket Cap Screws Black Oxide SKU 17034 $0.75
Approved Vendor 1/4-20x2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17035 $0.52
Approved Vendor 1/4-20x2" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17036 $0.80
Approved Vendor 1/4-20x2" Alloy Socket Head Cap Screws Black Oxide SKU 17037 $0.39
Approved Vendor 1/4-20x2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17038 $0.97
Approved Vendor 1/4-20x2" Alloy Socket Head Cap Screws Zinc Clear SKU 17039 $0.81
Approved Vendor 1/4-20x2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2572 $0.55
Approved Vendor 1/4-20x2-1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2678 $0.74
Approved Vendor 1/4-20x2-1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 17062 $0.94
Approved Vendor 1/4-20x2-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17063 $0.95
Approved Vendor 1/4-20x2-1/2" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17064 $0.85
Approved Vendor 1/4-20x2-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 17065 $0.56

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