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 35

Approved Vendor M16-2.0x150 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 792 $9.41
Approved Vendor M16-2.0x25 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 579 $5.32
Approved Vendor M16-2.0x25 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 423250 $278.06
Approved Vendor M16-2.0x30 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 424250 $314.23
Approved Vendor M16-2.0x30 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 425250 $386.47
Approved Vendor M16-2.0x30 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 767 $5.27
Approved Vendor M16-2.0x35 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 426200 $276.19
Approved Vendor M16-2.0x35 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 768 $3.00
Approved Vendor M16-2.0x35 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 769 $5.71
Approved Vendor M16-2.0x40 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 580 $5.65
Approved Vendor M16-2.0x40 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 427200 $306.26
Approved Vendor M16-2.0x40 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 770 $3.17
Approved Vendor M16-2.0x40 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 771 $6.12
Approved Vendor M16-2.0x45 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 581 $6.21
Approved Vendor M16-2.0x45 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 428150 $264.58
Approved Vendor M16-2.0x45 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 429150 $324.63
Approved Vendor M16-2.0x45 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 772 $3.48
Approved Vendor M16-2.0x50 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 582 $6.68
Approved Vendor M16-2.0x50 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 430150 $283.66
Approved Vendor M16-2.0x50 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 431150 $348.40
Approved Vendor M16-2.0x60 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 432150 $323.64
Approved Vendor M16-2.0x60 Class 12.9 Alloy Flat Socket Head Cap Screws Zinc SKU 433150 $398.24
Approved Vendor M16-2.0x65 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 434125 $291.77
Approved Vendor M16-2.0x70 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 435100 $264.96
Approved Vendor M16-2.0x70 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 780 $4.66
Approved Vendor M16-2.0x70 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 781 $9.21
Approved Vendor M16-2.0x80 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 436100 $311.84
Approved Vendor M16-2.0x80 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 782 $5.29
Approved Vendor M16-2.0x80 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 783 $10.10
Approved Vendor M16-2.0x90 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 43775 $254.62
Approved Vendor M16-2.0x90 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 784 $5.70
Approved Vendor M16-2.0x90 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 785 $10.94
Approved Vendor M2-0.4x3 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28878 $0.17
Approved Vendor M2-0.4x5 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28877 $0.35
Approved Vendor M2-0.4x6 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28876 $0.38
Approved Vendor M2.5-0.45x3 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28875 $0.40
Approved Vendor M2.5-0.45x4 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28874 $0.40
Approved Vendor M2.5-0.45x5 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28873 $0.42
Approved Vendor M20 x 100MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26331 $82.00
Approved Vendor M20 x 120MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26332 $87.45
Approved Vendor M20 x 40MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26325 $40.25
Approved Vendor M20 x 50MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26326 $43.81
Approved Vendor M20 x 60MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26327 $47.37
Approved Vendor M20 x 70MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26328 $54.17
Approved Vendor M20 x 80MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26329 $60.46
Approved Vendor M20 x 90MM x M16-2.0 Allen Socket Alloy Shoulder Bolts Black Oxide SKU 26330 $70.43
Approved Vendor M3-0.5x10 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4472500 $169.48
Approved Vendor M3-0.5x10 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2732500 $172.30

More in Fasteners