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 42

Approved Vendor M8-1.25x18 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 675 $0.46
Approved Vendor M8-1.25x20 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 527 $0.55
Approved Vendor M8-1.25x20 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 528 $0.69
Approved Vendor M8-1.25x20 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 3491500 $288.30
Approved Vendor M8-1.25x20 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 3501500 $356.37
Approved Vendor M8-1.25x20 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 676 $0.42
Approved Vendor M8-1.25x20 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 677 $0.75
Approved Vendor M8-1.25x25 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 529 $0.64
Approved Vendor M8-1.25x25 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 530 $0.80
Approved Vendor M8-1.25x25 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 3511000 $236.98
Approved Vendor M8-1.25x25 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 3521000 $291.97
Approved Vendor M8-1.25x25 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 678 $0.48
Approved Vendor M8-1.25x25 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 679 $0.35
Approved Vendor M8-1.25x30 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 531 $0.74
Approved Vendor M8-1.25x30 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 532 $0.93
Approved Vendor M8-1.25x30 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 3531000 $263.94
Approved Vendor M8-1.25x30 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 3541000 $326.76
Approved Vendor M8-1.25x30 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 680 $0.51
Approved Vendor M8-1.25x30 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 681 $0.95
Approved Vendor M8-1.25x30 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28866 $0.91
Approved Vendor M8-1.25x35 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 533 $0.84
Approved Vendor M8-1.25x35 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 534 $1.04
Approved Vendor M8-1.25x35 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 355800 $249.58
Approved Vendor M8-1.25x35 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 356800 $307.77
Approved Vendor M8-1.25x35 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 682 $0.58
Approved Vendor M8-1.25x35 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 683 $1.16
Approved Vendor M8-1.25x35 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28865 $1.02
Approved Vendor M8-1.25x40 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 535 $0.94
Approved Vendor M8-1.25x40 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 536 $1.17
Approved Vendor M8-1.25x40 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 357800 $274.56
Approved Vendor M8-1.25x40 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 358800 $339.20
Approved Vendor M8-1.25x40 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 684 $0.66
Approved Vendor M8-1.25x40 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 685 $1.17
Approved Vendor M8-1.25x45 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 537 $1.03
Approved Vendor M8-1.25x45 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 359700 $264.76
Approved Vendor M8-1.25x45 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 360700 $326.90
Approved Vendor M8-1.25x45 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 686 $0.75
Approved Vendor M8-1.25x45 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 687 $1.43
Approved Vendor M8-1.25x50 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 538 $1.13
Approved Vendor M8-1.25x50 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 361500 $228.38
Approved Vendor M8-1.25x50 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 362500 $281.26
Approved Vendor M8-1.25x50 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 688 $0.81
Approved Vendor M8-1.25x50 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 689 $1.54
Approved Vendor M8-1.25x60 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 539 $1.39
Approved Vendor M8-1.25x60 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 363400 $217.32
Approved Vendor M8-1.25x60 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 690 $0.98
Approved Vendor M8-1.25x60 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 691 $1.81
Approved Vendor M8-1.25x70 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 540 $1.63

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