Socket Head Screws

2,000+ products

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 5

Approved Vendor #4-40x1" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9456 $0.22
Approved Vendor #4-40x1" Alloy Socket Head Cap Screws Black Oxide SKU 9457 $0.25
Approved Vendor #4-40x1-1/2" Alloy Button Socket Head Cap Screws Black Oxide SKU 9459 $2.61
Approved Vendor #4-40x1-1/2" Alloy Socket Head Cap Screws Black Oxide SKU 9460 $0.43
Approved Vendor #4-40x1-1/4" 18-8 Button Head Socket Cap Screw Stainless Steel SKU 2536 $0.17
Approved Vendor #4-40x1-1/4" Alloy Button Socket Head Cap Screws Black Oxide SKU 9461 $1.10
Approved Vendor #4-40x1-1/4" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9462 $0.36
Approved Vendor #4-40x1-1/4" Alloy Socket Head Cap Screws Black Oxide SKU 9463 $0.26
Approved Vendor #4-40x1/2" 18-8 Button Head Socket Cap Screw Stainless Steel SKU 2531 $0.06
Approved Vendor #4-40x1/2" 18-8 Stainless Steel Flat Socket Head Cap Screws SKU 2638 $0.07
Approved Vendor #4-40x1/2" Alloy Button Socket Head Cap Screws Black Oxide SKU 9464 $0.13
Approved Vendor #4-40x1/2" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9466 $0.14
Approved Vendor #4-40x1/2" Alloy Socket Head Cap Screws Black Oxide SKU 9468 $0.15
Approved Vendor #4-40x1/2" Brass Flat Head Socket Cap Screw SKU 9470 $2.40
Approved Vendor #4-40x1/2" Brass Socket Head Cap Screw SKU 9471 $1.27
Approved Vendor #4-40x1/2" Low Socket Head Cap Screws Thermal Black Oxide SKU 9472 $1.62
Approved Vendor #4-40x1/4" 18-8 Button Head Socket Cap Screw Stainless Steel SKU 2529 $0.05
Approved Vendor #4-40x1/4" 18-8 Stainless Steel Flat Socket Head Cap Screws SKU 2636 $0.06
Approved Vendor #4-40x1/4" Alloy Button Socket Head Cap Screws Black Oxide SKU 9473 $0.12
Approved Vendor #4-40x1/4" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9475 $0.11
Approved Vendor #4-40x1/4" Alloy Socket Head Cap Screws Black Oxide SKU 9477 $0.15
Approved Vendor #4-40x1/4" Brass Flat Head Socket Cap Screw SKU 9479 $1.78
Approved Vendor #4-40x1/4" Brass Socket Head Cap Screw SKU 9480 $0.81
Approved Vendor #4-40x1/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 9481 $1.22
Approved Vendor #4-40x3/16" Brass Flat Head Socket Cap Screw SKU 9489 $2.60
Approved Vendor #4-40x3/16" Brass Socket Head Cap Screw SKU 9490 $2.17
Approved Vendor #4-40x3/4" 18-8 Button Head Socket Cap Screw Stainless Steel SKU 2533 $0.11
Approved Vendor #4-40x3/4" 18-8 Stainless Steel Flat Socket Head Cap Screws SKU 2640 $0.08
Approved Vendor #4-40x3/4" Alloy Button Socket Head Cap Screws Black Oxide SKU 9493 $0.17
Approved Vendor #4-40x3/4" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9494 $0.17
Approved Vendor #4-40x3/4" Alloy Socket Head Cap Screws Black Oxide SKU 9496 $0.18
Approved Vendor #4-40x3/4" Brass Socket Head Cap Screw SKU 9498 $1.02
Approved Vendor #4-40x3/4" Low Socket Head Cap Screws Thermal Black Oxide SKU 9499 $1.76
Approved Vendor #4-40x3/8" 18-8 Button Head Socket Cap Screw Stainless Steel SKU 2530 $0.06
Approved Vendor #4-40x3/8" 18-8 Stainless Steel Flat Socket Head Cap Screws SKU 2637 $0.07
Approved Vendor #4-40x3/8" Alloy Button Socket Head Cap Screws Black Oxide SKU 9500 $0.13
Approved Vendor #4-40x3/8" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9502 $0.12
Approved Vendor #4-40x3/8" Alloy Socket Head Cap Screws Black Oxide SKU 9504 $0.15
Approved Vendor #4-40x3/8" Brass Flat Head Socket Cap Screw SKU 9506 $1.84
Approved Vendor #4-40x3/8" Brass Socket Head Cap Screw SKU 9507 $0.68
Approved Vendor #4-40x3/8" Low Socket Head Cap Screws Thermal Black Oxide SKU 9508 $1.48
Approved Vendor #4-40x5/16" Brass Flat Head Socket Cap Screw SKU 9513 $1.83
Approved Vendor #4-40x5/16" Brass Socket Head Cap Screw SKU 9514 $2.92
Approved Vendor #4-40x5/8" 18-8 Button Head Socket Cap Screw Stainless Steel SKU 2532 $0.09
Approved Vendor #4-40x5/8" 18-8 Stainless Steel Flat Socket Head Cap Screws SKU 2639 $0.08
Approved Vendor #4-40x5/8" Alloy Button Socket Head Cap Screws Black Oxide SKU 9516 $0.15
Approved Vendor #4-40x5/8" Alloy Flat Socket Head Cap Screws Black Oxide SKU 9518 $0.15
Approved Vendor #4-40x5/8" Alloy Socket Head Cap Screws Black Oxide SKU 9520 $0.17

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