VIEW CART Continue shopping

UNF, 1/4", Hex Bolt, High Tensile/ 5/ 8.8, Zinc, DIN 931.

UNF, 1/4", Hexagon Head Bolts, High Tensile (5/ 8.8), Zinc/ BZP/ Cr3. UNF 1/4" has 28 T. P. I (Threads Per Inch) Fixabal sells all lengths of 1/4" UNF Bolts (PT-Partially...
£2.39 £3.59

UNF, 1/4", Hexagon Head Bolts, High Tensile (5/ 8.8), Zinc/ BZP/ Cr3.

UNF 1/4" has 28 T. P. I (Threads Per Inch)

Fixabal sells all lengths of 1/4" UNF Bolts (PT-Partially Threaded) and Sets (FT-Fully threaded) at the best internet prices. Postage Upgrades available at checkout.

Standard, Free Delivery is Royal Mail, 2nd Class (2-5 days, most likely 2 days). For a faster delivery time, select 1st class or courier at checkout. Packs weighing under 250grams are upgraded to 1st class as much as possible,

These bolts have threads as long as their diameters x 2.5 as a rule of thumb (please ask for exact measurement if it's crucial). As the bolt length gets longer the plain shank gets longer and the threaded part stays the same.

If the size you need isn't shown, please make an inquiry.

See images for UNC/ UNF Technical DATA. e.g. Spanner/ Wrench Sizes, How to measure a Hex Bolt.

UNF 1/4", 28 T. P. I (Threads Per Inch) Lengths Available:

1/4"-28x1/2",(FT) HEXAGON SET SCREW GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x5/8",(FT) HEXAGON SET SCREW GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x7/8",(FT) HEXAGON SET SCREW GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x3/4",(FT) HEXAGON SET SCREW GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x1",(FT) HEXAGON SET SCREW GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x1 1/4",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x1 1/2",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x1 3/4",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x2",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x2 1/4",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x2 1/2",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x2 3/4",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x3",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x3 1/2",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x4",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x4 1/2",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x5",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3
1/4"-28x6",(PT) HEXAGON BOLT GRADE 5 UNF MED. CARBON ZINC CR+3

 

High Tensile, Bolt, 5 Grade Steel (8.8)

UNC and UNF high tensile standard is marked with an, '5'. This is comparable with Metric, High Tensile - 8.8.

Bolt vs Set

A Hex Bolt (Part Plain Shank Bolt) is the term used for a partially threaded fastener, with a hexagon head; designed to be used with a nut and washer. A Hex Set (Screw Bolt) is the same, except it is fully threaded.

Bolt vs Screw

A screw screws into something, a bolt joins several things together from both sides of materials joined. A screw is fully threaded from underneath the head and a bolt is partially threaded (has a part-plain shank/ shoulder). There are exceptions to the rules!

 

UNIFIED THREAD STANDARDS 

Thread standards agreed upon by standard bodies of Canada, the United Kingdom, and the United States.  

Unified National Coarse (UNC) is a thread form with a 60 degree flank angle rounded roots and flat crests. For a given diameter it has a larger thread pitch than an equivalent diameter UNF thread. The unified thread is based on inch sizes and was first standardised in 1948 unifying the Whitworth and American standard thread forms

Unified National Extra Fine (UNEF) is a Unified thread form with a very fine (small) pitch that are typically used on instruments and parts requiring a fine adjustment.

Unified National Fine (UNF) is a thread form with a 60 degree flank angle rounded roots and flat crests. For a given diameter it has a smaller thread pitch than an equivalent diameter UNC thread.

Unified National (UN) thread form with a rounded root contour, applies only to external threads. (The UN thread form has a flat, or optionally, a rounded root contour.) The majority of fasteners with a Unified thread form (UNC, UNF) have a rounded root contour i.e. are UNR threads.