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 27

Approved Vendor 5/16-18x3" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2691 $1.42
Approved Vendor 5/16-18x3'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2584 $1.36
Approved Vendor 5/16-18x3/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2682 $0.46
Approved Vendor 5/16-18x3/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 934 $0.51
Approved Vendor 5/16-18x3/4'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2576 $0.45
Approved Vendor 5/16-18x3/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 930 $0.26
Approved Vendor 5/16-18x5/16" Stainless Steel Cup Point Allen Socket Set Screw SKU 929 $0.25
Approved Vendor 5/16-18x5/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2681 $0.45
Approved Vendor 5/16-18x5/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 933 $0.40
Approved Vendor 5/16-18x5/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2575 $0.42
Approved Vendor 5/16-18x7/16" Stainless Steel Cup Point Allen Socket Set Screw SKU 931 $0.30
Approved Vendor 5/16-18x7/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2683 $0.51
Approved Vendor 5/16-18x7/8" Stainless Steel Cup Point Allen Socket Set Screw SKU 935 $0.69
Approved Vendor 5/16-18x7/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2577 $0.48
Approved Vendor 5/16-24x1" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2740 $1.11
Approved Vendor 5/16-24x1'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2623 $1.09
Approved Vendor 5/16-24x1/2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2736 $0.63
Approved Vendor 5/16-24x1/2'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2620 $0.71
Approved Vendor 5/16-24x1/4" Stainless Steel Cup Point Allen Socket Set Screw SKU 991 $0.27
Approved Vendor 5/16-24x2" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2741 $3.05
Approved Vendor 5/16-24x3/4" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2738 $0.94
Approved Vendor 5/16-24x3/4'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2622 $0.97
Approved Vendor 5/16-24x5/16" Stainless Steel Cup Point Allen Socket Set Screw SKU 992 $0.29
Approved Vendor 5/16-24x5/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2737 $0.83
Approved Vendor 5/16-24x5/8'' 18-8 Stainless Steel Button Head Socket Cap Screws SKU 2621 $0.76
Approved Vendor 5/16-24x7/8" 18-8 Stainless Steel Flat Head Socket Cap Screws SKU 2739 $1.08
Approved Vendor 5/8" x 1" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1770 $30.50
Approved Vendor 5/8" x 1" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25663 $10.18
Approved Vendor 5/8" x 1-1/2" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1772 $40.23
Approved Vendor 5/8" x 1-1/2" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25664 $8.84
Approved Vendor 5/8" x 1-1/4" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1771 $33.15
Approved Vendor 5/8" x 1-1/4" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25665 $8.51
Approved Vendor 5/8" x 1-3/4" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1773 $43.23
Approved Vendor 5/8" x 1-3/4" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25666 $10.60
Approved Vendor 5/8" x 1/2" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1767 $28.73
Approved Vendor 5/8" x 1/2" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25675 $9.97
Approved Vendor 5/8" x 2" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1774 $46.24
Approved Vendor 5/8" x 2" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25700 $10.80
Approved Vendor 5/8" x 2-1/2" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1776 $52.77
Approved Vendor 5/8" x 2-1/2" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25701 $12.85
Approved Vendor 5/8" x 2-1/4" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1775 $49.07
Approved Vendor 5/8" x 2-1/4" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25702 $12.77
Approved Vendor 5/8" x 2-3/4" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25703 $14.47
Approved Vendor 5/8" x 3" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1778 $59.84
Approved Vendor 5/8" x 3" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25708 $14.76
Approved Vendor 5/8" x 3-1/2" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1779 $65.50
Approved Vendor 5/8" x 3-1/2" x 1/2-13" Allen Socket Alloy Shoulder Bolts Black Oxide SKU 25709 $17.24
Approved Vendor 5/8" x 3/4" x 1/2"-13 Allen Socket Stainless Steel Shoulder Bolts SKU 1769 $29.62

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