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 17

Approved Vendor 1/4-20x2-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17066 $2.42
Approved Vendor 1/4-20x2-1/2" Alloy Socket Head Cap Screws Zinc Clear SKU 17067 $0.97
Approved Vendor 1/4-20x2-1/2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2573 $0.73
Approved Vendor 1/4-20x2-1/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2677 $0.68
Approved Vendor 1/4-20x2-1/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17083 $1.30
Approved Vendor 1/4-20x2-1/4" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17084 $1.14
Approved Vendor 1/4-20x2-1/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17085 $0.87
Approved Vendor 1/4-20x2-1/4" Alloy Socket Head Cap Screws Black Oxide SKU 17086 $0.49
Approved Vendor 1/4-20x2-1/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17087 $2.33
Approved Vendor 1/4-20x2-1/4" Alloy Socket Head Cap Screws Zinc Clear SKU 17088 $0.88
Approved Vendor 1/4-20x3" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2679 $0.92
Approved Vendor 1/4-20x3" Alloy Button Head Socket Cap Screws Black Oxide SKU 17110 $1.09
Approved Vendor 1/4-20x3" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17111 $1.25
Approved Vendor 1/4-20x3" Alloy Socket Head Cap Screws Black Oxide SKU 17112 $0.66
Approved Vendor 1/4-20x3" Alloy Socket Head Cap Screws Zinc Clear SKU 17113 $1.18
Approved Vendor 1/4-20x3/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2670 $0.28
Approved Vendor 1/4-20x3/4" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17153 $2.60
Approved Vendor 1/4-20x3/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17155 $0.19
Approved Vendor 1/4-20x3/4" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17156 $0.35
Approved Vendor 1/4-20x3/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17157 $0.25
Approved Vendor 1/4-20x3/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17158 $0.22
Approved Vendor 1/4-20x3/4" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17159 $0.34
Approved Vendor 1/4-20x3/4" Alloy Socket Head Cap Screws Black Oxide SKU 17161 $0.18
Approved Vendor 1/4-20x3/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17162 $0.50
Approved Vendor 1/4-20x3/4" Alloy Socket Head Cap Screws Zinc Clear SKU 17163 $0.38
Approved Vendor 1/4-20x3/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 923 $0.32
Approved Vendor 1/4-20x3/4'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2566 $0.26
Approved Vendor 1/4-20x3/8" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17187 $2.13
Approved Vendor 1/4-20x3/8" Alloy Button Head Socket Cap Screws Black Oxide SKU 17188 $0.15
Approved Vendor 1/4-20x3/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17190 $0.15
Approved Vendor 1/4-20x3/8" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17192 $0.29
Approved Vendor 1/4-20x3/8" Alloy Socket Head Cap Screws Black Oxide SKU 17193 $0.23
Approved Vendor 1/4-20x3/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 919 $0.16
Approved Vendor 1/4-20x3/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2563 $0.23
Approved Vendor 1/4-20x5/16" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17220 $2.19
Approved Vendor 1/4-20x5/16" Alloy Button Head Socket Cap Screws Black Oxide SKU 17221 $0.42
Approved Vendor 1/4-20x5/16" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17223 $0.13
Approved Vendor 1/4-20x5/16" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17224 $0.25
Approved Vendor 1/4-20x5/16" Stainless Steel Cup Point Allen Socket Set Screw SKU 918 $0.15
Approved Vendor 1/4-20x5/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2669 $0.26
Approved Vendor 1/4-20x5/8" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17227 $2.60
Approved Vendor 1/4-20x5/8" Alloy Button Head Socket Cap Screws Black Oxide SKU 17229 $0.18
Approved Vendor 1/4-20x5/8" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17230 $0.31
Approved Vendor 1/4-20x5/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17231 $0.21
Approved Vendor 1/4-20x5/8" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17232 $0.19
Approved Vendor 1/4-20x5/8" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17233 $0.30
Approved Vendor 1/4-20x5/8" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17235 $0.40
Approved Vendor 1/4-20x5/8" Alloy Socket Head Cap Screws Black Oxide SKU 17236 $0.18

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