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 18

Approved Vendor 1/4-20x5/8" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17237 $0.51
Approved Vendor 1/4-20x5/8" Alloy Socket Head Cap Screws Zinc Clear SKU 17238 $0.34
Approved Vendor 1/4-20x5/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 922 $0.27
Approved Vendor 1/4-20x5/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2565 $0.24
Approved Vendor 1/4-20x7/16" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17250 $0.16
Approved Vendor 1/4-20x7/16" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17251 $0.70
Approved Vendor 1/4-20x7/16" Stainless Steel Cup Point Allen Socket Set Screw SKU 920 $0.20
Approved Vendor 1/4-20x7/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2671 $0.29
Approved Vendor 1/4-20x7/8" 18-8 Stainless Steel Socket Head Cap Screws USA Made SKU 17252 $3.01
Approved Vendor 1/4-20x7/8" Alloy Button Head Socket Cap Screws Black Oxide SKU 17254 $0.25
Approved Vendor 1/4-20x7/8" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17255 $0.39
Approved Vendor 1/4-20x7/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17256 $0.29
Approved Vendor 1/4-20x7/8" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17257 $0.37
Approved Vendor 1/4-20x7/8" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17258 $0.33
Approved Vendor 1/4-20x7/8" Alloy Socket Head Cap Screws Black Oxide SKU 17259 $0.20
Approved Vendor 1/4-20x7/8" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 17260 $0.56
Approved Vendor 1/4-20x7/8" Alloy Socket Head Cap Screws Zinc Clear SKU 17261 $0.40
Approved Vendor 1/4-20x7/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 924 $0.46
Approved Vendor 1/4-20x7/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2567 $0.29
Approved Vendor 1/4-28x1" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2732 $0.60
Approved Vendor 1/4-28x1" Alloy Button Head Socket Cap Screws Black Oxide SKU 17268 $0.34
Approved Vendor 1/4-28x1" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17269 $0.46
Approved Vendor 1/4-28x1" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17271 $0.39
Approved Vendor 1/4-28x1" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17272 $0.34
Approved Vendor 1/4-28x1" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17273 $0.46
Approved Vendor 1/4-28x1" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17274 $0.84
Approved Vendor 1/4-28x1" Alloy Socket Head Cap Screws Black Oxide SKU 17275 $0.35
Approved Vendor 1/4-28x1" Alloy Socket Head Cap Screws Zinc Clear SKU 17276 $0.47
Approved Vendor 1/4-28x1'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2617 $0.48
Approved Vendor 1/4-28x1-1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2733 $0.89
Approved Vendor 1/4-28x1-1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 17283 $0.91
Approved Vendor 1/4-28x1-1/2" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17285 $0.67
Approved Vendor 1/4-28x1-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17286 $0.54
Approved Vendor 1/4-28x1-1/2" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17287 $0.71
Approved Vendor 1/4-28x1-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 17288 $0.48
Approved Vendor 1/4-28x1-1/2" Alloy Socket Head Cap Screws Zinc Clear SKU 17289 $0.66
Approved Vendor 1/4-28x1-1/2" Stainless Steel Cup Point Allen Socket Set Screw SKU 990 $0.92
Approved Vendor 1/4-28x1-1/2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2618 $0.79
Approved Vendor 1/4-28x1-1/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17295 $0.75
Approved Vendor 1/4-28x1-1/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17297 $0.52
Approved Vendor 1/4-28x1-1/4" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17298 $1.01
Approved Vendor 1/4-28x1-1/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 989 $0.80
Approved Vendor 1/4-28x1-3/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2734 $0.95
Approved Vendor 1/4-28x1-3/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17304 $1.01
Approved Vendor 1/4-28x1-3/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17305 $0.90
Approved Vendor 1/4-28x1-3/4" Alloy Socket Head Cap Screws Black Oxide SKU 17306 $0.53
Approved Vendor 1/4-28x1-3/4" Alloy Socket Head Cap Screws Zinc Clear SKU 17307 $0.73
Approved Vendor 1/4-28x1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2728 $0.39

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