Socket Cap Screws

Socket cap screws are threaded fasteners with recessed socket heads designed for installation with an Allen or hex key. They are used for precision assembly, equipment maintenance, fabrication, repair, and joining compatible threaded components where close tolerances, a compact head profile, or a clean, tooled appearance is important.

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Helpful Buying Guide

Socket Cap Screw Buying Guide

Choose socket cap screws by first matching the thread system, diameter, pitch or thread designation, and length to the components in your assembly. Then compare the listed material, finish, class designation, head profile, and package quantity for the requirements of the job.

Visual Guide

Popular examples in this category

M12 x 1.75 x 80 mm Steel Socket Cap ScrewM12 x 1.75 x 80 mm Steel Socket Cap ScrewWBB2291277M3 x 0.5 x 8 mm 304 Stainless Steel Socket Head Cap ScrewM3 x 0.5 x 8 mm 304 Stainless Steel Socket Head Cap ScrewWBB2298798M5 x 0.8 x 20 mm Steel Socket Cap Screw, Black Oxide, Class 12.9M5 x 0.8 x 20 mm Steel Socket Cap Screw, Black Oxide, Class 12.9WBB2291144M8 x 1.25 x 50 mm 304 Stainless Steel Socket Head Cap Screw, Package of 50M8 x 1.25 x 50 mm 304 Stainless Steel Socket Head Cap Screw, Package of 50WBB2298350
Use Cases

Built for precise threaded fastening

Socket cap screws represented here are used in precision assembly, equipment servicing, maintenance, fabrication, repair, and shop work. They secure compatible components in threaded applications.

How to Choose

Match the thread before anything else

Confirm whether the application requires a metric thread or an inch thread, then match the stated diameter and pitch or designation, such as M5 x 0.8, 1/4-20 UNC, or 10-32 UNF. Select the length specified for the assembly.

Applications

Consider head access and assembly space

The recessed socket head accepts an Allen or hex key. Compact socket-head options can suit assemblies where a compact profile or limited counterbore surface area is important.

Additional Info

Compare material, finish, class, and quantity

Available options include 304 stainless steel, steel, and steel alloy, with black oxide or thermal black oxide finishes on listed steel options. Some metric steel screws carry a Class 12.9 designation, and selected inch sizes are offered in packs of 100.

M2.5–M12Metric sizes represented

Listed metric thread diameters span from M2.5 through M12.

8–80 mmMetric lengths represented

The represented metric screw lengths range from 8 mm to 80 mm.

UNC & UNFInch thread designations

Listed inch-thread options include both UNC and UNF designations.

100Largest stated pack quantity

Selected 1/4-20 socket cap screws are listed in packs of 100.

Comparison Guide

Compare the represented socket cap screw options

Use thread system, construction, and available lengths as a practical starting point for comparing the products represented in this category.

Product typeThread and length examplesListed construction and details
Metric stainless steel socket head cap screwsM2.5 x 0.45 x 16 mm; M3 x 0.5 x 8 mm; M5 x 0.8 x 35 mm; M8 x 1.25 x 30 or 50 mm304 stainless steel; socket head driven with an Allen or hex key; compact M2.5 head profile is listed.
Metric steel socket cap screwsM5 x 0.8 x 20 mm; M10 x 1.5 x 40 mm; M12 x 1.75 x 80 mmSteel; black oxide finish; Class 12.9 designation on listed options; socket drive.
Inch steel alloy socket cap screws8-32 x 1/2 in. UNC; 10-32 x 1 in. UNF; 1/4-20 x 1-1/4 or 1-1/2 in. UNCSteel alloy; thermal black oxide on listed options; selected 1/4-20 options are available in packs of 100.
Planning Guide

Plan the right fit before choosing

1. Confirm thread compatibility

Start with the required size, pitch, and thread family

A socket cap screw must match the threaded hole or compatible component. The category includes metric sizes from M2.5 through M12 with stated pitches, plus inch-thread options including 8-32 UNC, 10-32 UNF, and 1/4-20 UNC.

  • Metric examples include M2.5 x 0.45, M3 x 0.5, M5 x 0.8, M8 x 1.25, M10 x 1.5, and M12 x 1.75.
  • Inch examples include 8-32 UNC, 10-32 UNF, and 1/4-20 UNC.
  • Do not treat UNC and UNF designations as interchangeable; select the designation stated for the compatible application.
2. Select the screw length and construction

Use the listed length and material to narrow the options

Lengths in the represented products range from compact 8 mm and 16 mm metric options to 1/2-inch, 1-inch, 1-1/4-inch, and 1-1/2-inch inch options. Construction choices include 304 stainless steel, steel, and steel alloy.

  • Metric lengths represented include 8, 16, 20, 30, 35, 40, 50, and 80 mm.
  • Inch lengths represented include 1/2 inch, 1 inch, 1-1/4 inches, and 1-1/2 inches.
  • Select 304 stainless steel, steel, or steel alloy according to the construction specified for the compatible assembly.
3. Review installation and listed finish details

Plan for a socket drive and the specified appearance

The socket head design allows installation and removal with an Allen or hex key. Listed black oxide and thermal black oxide finishes provide the specified finished appearance, while certain metric steel options are identified as Class 12.9.

  • Use a compatible Allen or hex key for socket-head installation.
  • Black oxide is listed on selected metric steel screws and a 1/4-20 inch option.
  • Thermal black oxide is listed on selected steel alloy inch-thread options.
  • Class 12.9 is listed on selected M5, M10, and M12 steel socket cap screws.
FAQ

Common questions before buying

What tool is used to install a socket cap screw?

The represented socket cap screws are installed with an Allen or hex key.

Are both metric and inch socket cap screws represented?

Yes. The listed products include metric thread sizes as well as inch-thread options with UNC and UNF designations.

What materials are available in the represented products?

The summaries list 304 stainless steel, steel, and steel alloy constructions.

Which socket cap screws are available in packs of 100?

The represented 1/4-20 steel alloy socket cap screw options in 1-1/4-inch and 1-1/2-inch lengths are listed in packs of 100.

Helpful Buying Guide

Socket Cap Screw Buying Guide

Choose socket cap screws by first matching the thread system, diameter, pitch or thread designation, and length to the components in your assembly. Then compare the listed material, finish, class designation, head profile, and package quantity for the requirements of the job.

Visual Guide

Popular examples in this category

M12 x 1.75 x 80 mm Steel Socket Cap ScrewM12 x 1.75 x 80 mm Steel Socket Cap ScrewWBB2291277M3 x 0.5 x 8 mm 304 Stainless Steel Socket Head Cap ScrewM3 x 0.5 x 8 mm 304 Stainless Steel Socket Head Cap ScrewWBB2298798M5 x 0.8 x 20 mm Steel Socket Cap Screw, Black Oxide, Class 12.9M5 x 0.8 x 20 mm Steel Socket Cap Screw, Black Oxide, Class 12.9WBB2291144M8 x 1.25 x 50 mm 304 Stainless Steel Socket Head Cap Screw, Package of 50M8 x 1.25 x 50 mm 304 Stainless Steel Socket Head Cap Screw, Package of 50WBB2298350
Use Cases

Built for precise threaded fastening

Socket cap screws represented here are used in precision assembly, equipment servicing, maintenance, fabrication, repair, and shop work. They secure compatible components in threaded applications.

How to Choose

Match the thread before anything else

Confirm whether the application requires a metric thread or an inch thread, then match the stated diameter and pitch or designation, such as M5 x 0.8, 1/4-20 UNC, or 10-32 UNF. Select the length specified for the assembly.

Applications

Consider head access and assembly space

The recessed socket head accepts an Allen or hex key. Compact socket-head options can suit assemblies where a compact profile or limited counterbore surface area is important.

Additional Info

Compare material, finish, class, and quantity

Available options include 304 stainless steel, steel, and steel alloy, with black oxide or thermal black oxide finishes on listed steel options. Some metric steel screws carry a Class 12.9 designation, and selected inch sizes are offered in packs of 100.

M2.5–M12Metric sizes represented

Listed metric thread diameters span from M2.5 through M12.

8–80 mmMetric lengths represented

The represented metric screw lengths range from 8 mm to 80 mm.

UNC & UNFInch thread designations

Listed inch-thread options include both UNC and UNF designations.

100Largest stated pack quantity

Selected 1/4-20 socket cap screws are listed in packs of 100.

Comparison Guide

Compare the represented socket cap screw options

Use thread system, construction, and available lengths as a practical starting point for comparing the products represented in this category.

Product typeThread and length examplesListed construction and details
Metric stainless steel socket head cap screwsM2.5 x 0.45 x 16 mm; M3 x 0.5 x 8 mm; M5 x 0.8 x 35 mm; M8 x 1.25 x 30 or 50 mm304 stainless steel; socket head driven with an Allen or hex key; compact M2.5 head profile is listed.
Metric steel socket cap screwsM5 x 0.8 x 20 mm; M10 x 1.5 x 40 mm; M12 x 1.75 x 80 mmSteel; black oxide finish; Class 12.9 designation on listed options; socket drive.
Inch steel alloy socket cap screws8-32 x 1/2 in. UNC; 10-32 x 1 in. UNF; 1/4-20 x 1-1/4 or 1-1/2 in. UNCSteel alloy; thermal black oxide on listed options; selected 1/4-20 options are available in packs of 100.
Planning Guide

Plan the right fit before choosing

1. Confirm thread compatibility

Start with the required size, pitch, and thread family

A socket cap screw must match the threaded hole or compatible component. The category includes metric sizes from M2.5 through M12 with stated pitches, plus inch-thread options including 8-32 UNC, 10-32 UNF, and 1/4-20 UNC.

  • Metric examples include M2.5 x 0.45, M3 x 0.5, M5 x 0.8, M8 x 1.25, M10 x 1.5, and M12 x 1.75.
  • Inch examples include 8-32 UNC, 10-32 UNF, and 1/4-20 UNC.
  • Do not treat UNC and UNF designations as interchangeable; select the designation stated for the compatible application.
2. Select the screw length and construction

Use the listed length and material to narrow the options

Lengths in the represented products range from compact 8 mm and 16 mm metric options to 1/2-inch, 1-inch, 1-1/4-inch, and 1-1/2-inch inch options. Construction choices include 304 stainless steel, steel, and steel alloy.

  • Metric lengths represented include 8, 16, 20, 30, 35, 40, 50, and 80 mm.
  • Inch lengths represented include 1/2 inch, 1 inch, 1-1/4 inches, and 1-1/2 inches.
  • Select 304 stainless steel, steel, or steel alloy according to the construction specified for the compatible assembly.
3. Review installation and listed finish details

Plan for a socket drive and the specified appearance

The socket head design allows installation and removal with an Allen or hex key. Listed black oxide and thermal black oxide finishes provide the specified finished appearance, while certain metric steel options are identified as Class 12.9.

  • Use a compatible Allen or hex key for socket-head installation.
  • Black oxide is listed on selected metric steel screws and a 1/4-20 inch option.
  • Thermal black oxide is listed on selected steel alloy inch-thread options.
  • Class 12.9 is listed on selected M5, M10, and M12 steel socket cap screws.
FAQ

Common questions before buying

What tool is used to install a socket cap screw?

The represented socket cap screws are installed with an Allen or hex key.

Are both metric and inch socket cap screws represented?

Yes. The listed products include metric thread sizes as well as inch-thread options with UNC and UNF designations.

What materials are available in the represented products?

The summaries list 304 stainless steel, steel, and steel alloy constructions.

Which socket cap screws are available in packs of 100?

The represented 1/4-20 steel alloy socket cap screw options in 1-1/4-inch and 1-1/2-inch lengths are listed in packs of 100.

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