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 19

Approved Vendor 1/4-28x1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 17311 $0.23
Approved Vendor 1/4-28x1/2" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17312 $0.31
Approved Vendor 1/4-28x1/2" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17314 $0.19
Approved Vendor 1/4-28x1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17315 $0.28
Approved Vendor 1/4-28x1/2" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17316 $0.37
Approved Vendor 1/4-28x1/2" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17318 $0.37
Approved Vendor 1/4-28x1/2" Alloy Socket Head Cap Screws Black Oxide SKU 17319 $0.27
Approved Vendor 1/4-28x1/2" Alloy Socket Head Cap Screws Zinc Clear SKU 17320 $0.36
Approved Vendor 1/4-28x1/2" Stainless Steel Cup Point Allen Socket Set Screw SKU 985 $0.28
Approved Vendor 1/4-28x1/2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2613 $0.31
Approved Vendor 1/4-28x1/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17325 $0.53
Approved Vendor 1/4-28x1/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17327 $0.14
Approved Vendor 1/4-28x1/4" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17329 $0.23
Approved Vendor 1/4-28x1/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 981 $0.18
Approved Vendor 1/4-28x2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2735 $1.10
Approved Vendor 1/4-28x2" Alloy Button Head Socket Cap Screws Black Oxide SKU 17330 $1.16
Approved Vendor 1/4-28x2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17331 $1.27
Approved Vendor 1/4-28x2" Alloy Socket Head Cap Screws Black Oxide SKU 17332 $0.62
Approved Vendor 1/4-28x2" Alloy Socket Head Cap Screws Zinc Clear SKU 17333 $0.83
Approved Vendor 1/4-28x2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2619 $1.02
Approved Vendor 1/4-28x2-1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 17337 $1.47
Approved Vendor 1/4-28x2-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17338 $1.60
Approved Vendor 1/4-28x2-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 17339 $1.30
Approved Vendor 1/4-28x2-1/2" Alloy Socket Head Cap Screws Zinc Clear SKU 17340 $1.01
Approved Vendor 1/4-28x3" Alloy Button Head Socket Cap Screws Black Oxide SKU 17350 $2.45
Approved Vendor 1/4-28x3" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17351 $2.15
Approved Vendor 1/4-28x3" Alloy Socket Head Cap Screws Black Oxide SKU 17352 $1.61
Approved Vendor 1/4-28x3/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2730 $0.51
Approved Vendor 1/4-28x3/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 17365 $0.27
Approved Vendor 1/4-28x3/4" Alloy Button Head Socket Cap Screws Zinc Clear SKU 17366 $0.37
Approved Vendor 1/4-28x3/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17368 $0.28
Approved Vendor 1/4-28x3/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 17369 $0.29
Approved Vendor 1/4-28x3/4" Alloy Flat Head Socket Cap Screws Zinc Clear SKU 17370 $0.39
Approved Vendor 1/4-28x3/4" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17372 $0.62
Approved Vendor 1/4-28x3/4" Alloy Socket Head Cap Screws Black Oxide SKU 17373 $0.30
Approved Vendor 1/4-28x3/4" Alloy Socket Head Cap Screws Zinc Clear SKU 17374 $0.41
Approved Vendor 1/4-28x3/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 987 $0.40
Approved Vendor 1/4-28x3/4'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2615 $0.40
Approved Vendor 1/4-28x3/8" Alloy Button Head Socket Cap Screws Black Oxide SKU 17380 $0.20
Approved Vendor 1/4-28x3/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17382 $0.16
Approved Vendor 1/4-28x3/8" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17384 $0.30
Approved Vendor 1/4-28x3/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 983 $0.22
Approved Vendor 1/4-28x5/16" Alloy Button Head Socket Cap Screws Black Oxide SKU 17394 $0.48
Approved Vendor 1/4-28x5/16" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 17395 $0.15
Approved Vendor 1/4-28x5/16" Alloy Knurled Cup Point Allen Socket Set Screw Black Oxide SKU 17397 $0.25
Approved Vendor 1/4-28x5/16" Stainless Steel Cup Point Allen Socket Set Screw SKU 982 $0.20
Approved Vendor 1/4-28x5/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2729 $0.44
Approved Vendor 1/4-28x5/8" Alloy Button Head Socket Cap Screws Black Oxide SKU 17398 $0.24

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