UNF, 1/4", Hex-Set (S/ 8.8), Zinc.
UNF, 1/4", Bolts, Hex Head, High Tensile (S), Zinc Plated.
28 T. P. I. (threads per Inch)
Fixaball.co.uk sells a comprehensive range of 1/4" UNF, zinc, fully threaded hexagon head, sets at the best prices with free, first class post.
Please select length and pack quantity from the drop down menu.
Example: if you need 14, please select 1 pack of 4 and 1 pack of 10.
1/4" UNF lengths availaball as a fully threaded fastener
UNC and UNF high tensile standard is marked with an, 'S'. This is comparable with Metric, High Tensile - 8.8.
Hex Set Screw
A fastener stated as a set is fully threaded and measured from where the thread starts to where it ends.
Bolt vs Screw
A screw is twisted directly into material to create a fastened joint. A bolt joins several components together from both sides of the materials joined. A screw is fully threaded from underneath the head and a bolt is partially threaded has a part-plain shank under the face of the head. The plain shank is to reduce damage to the hole to which it is inserted if the joint is prone to movement. A sets thread may damage or open a hole if the joint is prone to movement.
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.
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