UNC, 3/8", Hex-Bolt and Hex-Set Screw (8.8), Zinc.

UNC, 3/8", Hexagon Head, Shoulder Bolts and Fully Threaded Sets , High Tensile (5/ 8.8), Zinc. Fixaball.co.uk sells a comprehensive range of bolts with all head, material and thread types, at...
£2.36

UNC, 3/8", Hexagon Head, Shoulder Bolts and Fully Threaded Sets , High Tensile (5/ 8.8), Zinc.

Fixaball.co.uk sells a comprehensive range of bolts with all head, material and thread types, at the best internet prices.

Free Delivery to UK

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).

If the size you need isn't shown, please make inquires (SELF-COLOUR can be treated on request)

High Tensile, Shoulder Bolt.

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 (Shoulder 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!

Table to show the different sizes available in ZINC. Please make inquiries for special sizes.

UNC 3/8” Sizes (16 TPI)

7"

6"

5.3/4”

5.1/2"

5.1/4”

5"

4.3/4”

4.1/2"

4.1/4”

4"

3.3/4”

3.1/2"

3.1/4"

3”

2.3/4”

2.1/2"

2.3/8”

2.1/4"

1.3/4”

1.5/8”

1.1/2"

1.3/8”

1.1/4"

1.1/8”

1”

7/8”

¾”

5/8”

½”

UNIFIED THREAD STANDARDS 

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

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.

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 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 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.

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  • Email: sam@fixaball.co.uk