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 29

Approved Vendor 5/8-11x2-1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2715 $9.96
Approved Vendor 5/8-11x2-1/2" Alloy Button Head Socket Cap Screws Black Oxide SKU 26145 $8.78
Approved Vendor 5/8-11x2-1/2" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 26146 $5.16
Approved Vendor 5/8-11x2-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26147 $3.71
Approved Vendor 5/8-11x2-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 26148 $3.85
Approved Vendor 5/8-11x2-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 26149 $7.09
Approved Vendor 5/8-11x2-1/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2714 $9.34
Approved Vendor 5/8-11x2-1/4" Alloy Button Head Socket Cap Screws Black Oxide SKU 26161 $8.02
Approved Vendor 5/8-11x2-1/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26162 $3.80
Approved Vendor 5/8-11x2-1/4" Alloy Socket Head Cap Screws Black Oxide SKU 26163 $3.60
Approved Vendor 5/8-11x2-1/4" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 26164 $7.17
Approved Vendor 5/8-11x2-3/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26173 $6.84
Approved Vendor 5/8-11x2-3/4" Alloy Socket Head Cap Screws Black Oxide SKU 26174 $4.16
Approved Vendor 5/8-11x3" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2716 $12.57
Approved Vendor 5/8-11x3" Alloy Button Head Socket Cap Screws Black Oxide SKU 26181 $10.32
Approved Vendor 5/8-11x3" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 26182 $7.46
Approved Vendor 5/8-11x3" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26183 $5.02
Approved Vendor 5/8-11x3" Alloy Socket Head Cap Screws Black Oxide SKU 26184 $4.45
Approved Vendor 5/8-11x3" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 26185 $8.54
Approved Vendor 5/8-11x3-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26196 $9.02
Approved Vendor 5/8-11x3-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 26197 $5.26
Approved Vendor 5/8-11x3/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 26219 $1.33
Approved Vendor 5/8-11x4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26220 $10.52
Approved Vendor 5/8-11x4" Alloy Socket Head Cap Screws Black Oxide SKU 26221 $5.80
Approved Vendor 5/8-11x5" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26242 $13.12
Approved Vendor 5/8-11x5" Alloy Socket Head Cap Screws Black Oxide SKU 26243 $7.77
Approved Vendor 5/8-11x5-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26269 $15.76
Approved Vendor 5/8-11x5-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 26333 $8.48
Approved Vendor 5/8-11x5/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 28953 $1.13
Approved Vendor 5/8-11x6" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26270 $15.50
Approved Vendor 5/8-11x6" Alloy Socket Head Cap Screws Black Oxide SKU 26334 $9.04
Approved Vendor 5/8-11x7/8" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 31814 $1.58
Approved Vendor 5/8-18x1" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26271 $4.68
Approved Vendor 5/8-18x1" Alloy Socket Head Cap Screws Black Oxide SKU 26335 $3.33
Approved Vendor 5/8-18x1-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26273 $5.43
Approved Vendor 5/8-18x1-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 26337 $4.14
Approved Vendor 5/8-18x1-1/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26272 $5.03
Approved Vendor 5/8-18x1-1/4" Alloy Socket Head Cap Screws Black Oxide SKU 26336 $3.72
Approved Vendor 5/8-18x1-3/4" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26274 $5.84
Approved Vendor 5/8-18x1-3/4" Alloy Socket Head Cap Screws Black Oxide SKU 26338 $4.46
Approved Vendor 5/8-18x2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26275 $6.64
Approved Vendor 5/8-18x2" Alloy Socket Head Cap Screws Black Oxide SKU 26339 $4.90
Approved Vendor 5/8-18x2-1/2" Alloy Flat Head Socket Cap Screws Black Oxide SKU 26276 $8.16
Approved Vendor 5/8-18x2-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 26340 $5.81
Approved Vendor 7/16-14x1" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 31812 $1.20
Approved Vendor 7/16-14x1" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 26341 $2.98
Approved Vendor 7/16-14x1-1/2" Alloy Socket Head Cap Screws Black Oxide USA Made SKU 26343 $3.10
Approved Vendor 7/16-14x1-1/4" Alloy Cup Point Allen Socket Set Screw Black Oxide SKU 31813 $1.52

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