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HT Allen Socket Cap Screws – UNC Series provide high‑strength 12.9 grade fasteners with a 12.9 black finish and BS 18.3 (1936) thread standard. They are available in a range of sizes from 1/2″ to 1″, with lengths up to 10″, and can be ordered with either full or half thread. This selection supports a variety of industrial fastening applications requiring a robust, hex‑socket cap design.

HT Allen Socket Cap Screw - UNC Series

66 products

HT Allen Hex Socket Cap Screw:1/2" x 1 1/2"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/2" x 1 1/2"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/2 1 1/2 C FT

HT Allen Hex Socket Cap Screw:1/2" x 1 1/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/2" x 1 1/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/2 1 1/4 C FT

HT Allen Hex Socket Cap Screw:1/2" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/2" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/2 1 C FT

HT Allen Hex Socket Cap Screw:1/2" x 2 1/2"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1/2" x 2 1/2"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121/2 2 1/2 C HT

HT Allen Hex Socket Cap Screw:1/2" x 3 1/2"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1/2" x 3 1/2"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121/2 3 1/2 C HT

HT Allen Hex Socket Cap Screw:1/2" x 3/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/2" x 3/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/2 3/4 C FT

HT Allen Hex Socket Cap Screw:1/2" x 5"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1/2" x 5"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121/2 5 C HT

HT Allen Hex Socket Cap Screw:1/2" x 6"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1/2" x 6"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121/2 6 C HT

HT Allen Hex Socket Cap Screw:1/4" x 1 1/2"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/4" x 1 1/2"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/4 1 1/2 C FT

HT Allen Hex Socket Cap Screw:1/4" x 1 1/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/4" x 1 1/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/4 1 1/4 C FT

HT Allen Hex Socket Cap Screw:1/4" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/4" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/4 1 C FT

HT Allen Hex Socket Cap Screw:1/4" x 2 1/2"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1/4" x 2 1/2"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121/4 2 1/2 C HT

HT Allen Hex Socket Cap Screw:1/4" x 3/8"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/4" x 3/8"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/4 3/8 C FT

HT Allen Hex Socket Cap Screw:1/4" x 5/8"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/4" x 5/8"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/4 5/8 C FT

HT Allen Hex Socket Cap Screw:1/8" x 1/2"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/8" x 1/2"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/8 1/2 C FT

HT Allen Hex Socket Cap Screw:1/8" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

1/8" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09121/8 1 C FT

HT Allen Hex Socket Cap Screw:1" x 10"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1" x 10"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121 10 C HT

HT Allen Hex Socket Cap Screw:1" x 4"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1" x 4"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121 4 C HT

HT Allen Hex Socket Cap Screw:1" x 6"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1" x 6"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121 6 C HT

HT Allen Hex Socket Cap Screw:1" x 8"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

1" x 8"UNC - BS 18.3 (1936)/12.9/Black/Half Thread

High-tensile steel · 09121 8 C HT

HT Allen Hex Socket Cap Screw:3/16" x 1 1/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

3/16" x 1 1/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09123/16 1 1/4 C FT

HT Allen Hex Socket Cap Screw:3/16" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

3/16" x 1"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09123/16 1 C FT

HT Allen Hex Socket Cap Screw:3/16" x 3/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

3/16" x 3/4"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09123/16 3/4 C FT

HT Allen Hex Socket Cap Screw:3/16" x 3/8"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

3/16" x 3/8"UNC - BS 18.3 (1936)/12.9/Black/Full Thread

High-tensile steel · 09123/16 3/8 C FT