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 36

Approved Vendor M3-0.5x10 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 586 $0.16
Approved Vendor M3-0.5x10 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 587 $0.19
Approved Vendor M3-0.5x12 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 4502500 $159.12
Approved Vendor M3-0.5x12 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2742500 $172.60
Approved Vendor M3-0.5x12 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 588 $0.17
Approved Vendor M3-0.5x12 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 589 $0.19
Approved Vendor M3-0.5x14 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4512500 $174.58
Approved Vendor M3-0.5x14 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 590 $0.20
Approved Vendor M3-0.5x16 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4522500 $180.33
Approved Vendor M3-0.5x16 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 4532500 $171.34
Approved Vendor M3-0.5x16 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2762500 $208.54
Approved Vendor M3-0.5x16 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 591 $0.21
Approved Vendor M3-0.5x16 Class 45H Knurled Cup Point Allen Socket Set Screws Black Oxide SKU 28843 $0.26
Approved Vendor M3-0.5x18 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2772500 $226.62
Approved Vendor M3-0.5x18 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 592 $0.20
Approved Vendor M3-0.5x20 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4542500 $189.79
Approved Vendor M3-0.5x20 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 4552500 $181.70
Approved Vendor M3-0.5x20 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2782500 $279.93
Approved Vendor M3-0.5x20 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 593 $0.23
Approved Vendor M3-0.5x25 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4562500 $209.91
Approved Vendor M3-0.5x25 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 4572500 $204.46
Approved Vendor M3-0.5x25 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2792500 $353.18
Approved Vendor M3-0.5x25 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 594 $0.24
Approved Vendor M3-0.5x25 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 595 $0.26
Approved Vendor M3-0.5x30 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4582500 $255.37
Approved Vendor M3-0.5x30 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2802500 $435.12
Approved Vendor M3-0.5x30 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 596 $0.29
Approved Vendor M3-0.5x35 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2812500 $436.98
Approved Vendor M3-0.5x35 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 597 $0.42
Approved Vendor M3-0.5x5 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4422500 $168.05
Approved Vendor M3-0.5x5 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2702500 $200.09
Approved Vendor M3-0.5x6 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2712500 $166.31
Approved Vendor M3-0.5x6 Class 12.9 Alloy Socket Head Cap Screws Black Oxide SKU 583 $0.15
Approved Vendor M3-0.5x6 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 584 $0.17
Approved Vendor M3-0.5x6 Class 45H Cup Point Allen Socket Set Screws Black Oxide SKU 28872 $0.13
Approved Vendor M3-0.5x8 Class 12.9 Alloy Flat Socket Head Cap Screws Black Oxide SKU 2722500 $166.37
Approved Vendor M3-0.5x8 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 585 $0.18
Approved Vendor M4 x 10MM x M3-0.5 Allen Socket Stainless Steel Shoulder Bolts SKU 1789 $10.58
Approved Vendor M4 x 4MM x M3-0.5 Allen Socket Stainless Steel Shoulder Bolts SKU 1786 $9.63
Approved Vendor M4 x 6MM x M3-0.5 Allen Socket Stainless Steel Shoulder Bolts SKU 1787 $9.91
Approved Vendor M4-0.70x20 Class 10.9 Low Socket Head Cap Screws Thermal Black Oxide SKU 28894 $0.33
Approved Vendor M4-0.70x25 Class 10.9 Low Socket Head Cap Screws Thermal Black Oxide SKU 28893 $0.35
Approved Vendor M4-0.7x10 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4632500 $194.28
Approved Vendor M4-0.7x10 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 4642500 $189.91
Approved Vendor M4-0.7x10 Class 12.9 Alloy Socket Head Cap Screws Zinc Plated SKU 601 $0.19
Approved Vendor M4-0.7x10 Class 45H Knurled Cup Point Allen Socket Set Screws Black Oxide SKU 28842 $0.17
Approved Vendor M4-0.7x12 Class 12.9 Alloy Button Socket Head Cap Screws Black Oxide SKU 4652500 $204.52
Approved Vendor M4-0.7x12 Class 12.9 Alloy Button Socket Head Cap Screws Zinc SKU 4662500 $201.17

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