Imperial hex head bolt UNC/UNF – full thread

Inch bolts

Imperial hex head bolt UNC/UNF – full thread

0,95 – 2,92 €

In stock — 263 pieces, ship immediately

The fully threaded imperial hex head bolt has a hexagonal head and a thread along its entire length, right up to the head. It is made in inch (imperial) sizes …

Available variants

DIN933 bolt 1/2"-UNFx3 FE 8.8 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 34254 · Catalogue number: DIN933-1/2UNFx3-FE8.8

Thread: 1/2"-UNF Length: 76.2 mm Pitch: 1.27 Strength grade: 8.8 Material: FE
2,79 € 7 pcs

DIN933 bolt 1/2"-UNFx2 1/2 FE 8.8 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 34218 · Catalogue number: DIN933-1/2UNFx2 1/2-FE8.8

Thread: 1/2"-UNF Length: 63.5 mm Pitch: 1.27 Strength grade: 8.8 Material: FE
1,99 € Out of stock

DIN933 bolt 1/2"-UNFx2 FE 8.8 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 26906 · Catalogue number: DIN933-1/2UNFx2-FE8.8

Thread: 1/2"-UNF Length: 50.8 mm Pitch: 1.27 Strength grade: 8.8 Material: FE
1,99 € 26 pcs

DIN933 bolt 3/8"-UNCx2 FE 8.8 hex head, fully threaded, UNC thread (Unified National Coarse)

ERP code: 15683 · Catalogue number: DIN933-3/8UNCx2-FE8.8

Thread: 3/8"-UNC Length: 50.8 mm Pitch: 1.587 Strength grade: 8.8 Material: FE
1,31 € Out of stock

DIN933 bolt 3/8"-UNCx1 1/2 FE 8.8 hex head, fully threaded, UNC thread (Unified National Coarse)

ERP code: 42444 · Catalogue number: DIN933-3/8UNCx1 1/2-FE8.8

Thread: 3/8"-UNC Length: 38.1 mm Pitch: 1.587 Strength grade: 8.8 Material: FE
0,95 € 1 pcs

DIN933 bolt 3/8"-UNCx1 FE 8.8 hex head, fully threaded, UNC thread (Unified National Coarse)

ERP code: 49595 · Catalogue number: DIN933-3/8UNCx1-FE8.8

Thread: 3/8"-UNC Length: 25.4 mm Pitch: 1.587 Strength grade: 8.8 Material: FE
0,95 € 28 pcs

DIN933 bolt 5/16"-UNFx3/4 FE 8.8 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 14288 · Catalogue number: DIN933-5/16UNFx3/4-FE8.8

Thread: 5/16"-UNF Length: 19 mm Pitch: 1.058 Strength grade: 8.8 Material: FE
1,32 € 43 pcs

DIN933 bolt 7/16"-UNCx2 FE 10.9 hex head, fully threaded, UNC thread (Unified National Coarse)

ERP code: 16556 · Catalogue number: DIN933-7/16UNCx2-FE10.9

Thread: 7/16"-UNC Length: 50.8 mm Pitch: 1.814 Strength grade: 10.9 Material: FE
1,99 € 21 pcs

DIN933 bolt 7/16"-UNCx1 1/2 FE 10.9 hex head, fully threaded, UNC thread (Unified National Coarse)

ERP code: 16555 · Catalogue number: DIN933-7/16UNCx1 1/2-FE10.9

Thread: 7/16"-UNC Length: 38.1 mm Pitch: 1.814 Strength grade: 10.9 Material: FE
2,79 € 99 pcs

DIN933 bolt 7/16"-UNFx1 1/2 FE 8.8 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 25591 · Catalogue number: DIN933-7/16UNFx1 1/2-FE8.8

Thread: 7/16"-UNF Length: 38.1 mm Pitch: 1.27 Strength grade: 8.8 Material: FE
2,92 € 14 pcs

DIN933 bolt 7/16"-UNFx1 1/4 FE 10.9 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 42912 · Catalogue number: DIN933-7/16UNFx1 1/4-FE10.9

Thread: 7/16"-UNF Length: 31.8 mm Pitch: 1.27 Strength grade: 10.9 Material: FE
1,59 € 24 pcs

DIN933 bolt 7/16"-UNFx1 FE 8.8 hex head, fully threaded, UNF thread (Unified National Fine)

ERP code: 42682 · Catalogue number: DIN933-7/16UNFx1-FE8.8

Thread: 7/16"-UNF Length: 25.4 mm Pitch: 1.27 Strength grade: 8.8 Material: FE
1,59 € Out of stock

The fully threaded imperial hex head bolt has a hexagonal head and a thread along its entire length, right up to the head. It is made in inch (imperial) sizes with UNC coarse or UNF fine thread to ASME B1.1. Its design corresponds to the metric DIN 933 bolt, and in British terminology it is also known as a hex set screw.

It is used in the maintenance and repair of machinery, vehicles, marine engines, agricultural and construction equipment, and any equipment built to inch dimensions, where a metric bolt is not a substitute.

When to choose a full thread?

  • The nut can be tightened at any point along the bolt, so one bolt suits joints of different thickness.
  • Suited to thin plates, tapped holes and joints that are taken apart often.
  • For joints subject to lateral (shear) loads, choose the partially threaded imperial hex head bolt.

UNC or UNF – what is the difference?

  • UNC (Unified National Coarse) – coarse thread with fewer threads per inch. Faster assembly and lower risk of thread damage; suited to general use and softer materials such as cast iron and aluminium.
  • UNF (Unified National Fine) – fine thread with more threads per inch and a smaller pitch. Better vibration resistance and a slightly larger tensile stress area; common in automotive, hydraulic and thin-walled applications.

Both threads have a 60° profile, but UNC and UNF bolts of the same diameter are not interchangeable.

How to read an imperial bolt designation

1/4"-20 UNC means: nominal diameter 1/4 inch (6.35 mm), 20 threads per inch (TPI), coarse thread. The same diameter with a fine thread is designated 1/4"-28 UNF.

Threads per inch (TPI) – UNC / UNF

  • 1/4" – 20 / 28
  • 5/16" – 18 / 24
  • 3/8" – 16 / 24
  • 7/16" – 14 / 20
  • 1/2" – 13 / 20
  • 5/8" – 11 / 18
  • 3/4" – 10 / 16
  • 1" – 8 / 12

Before ordering, check the diameter, threads per inch and bolt length. Select the size in the table below, and contact us if you need help choosing.

If you need more, please contact us

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