UNF 1/4", Hex Head, Set Screw, High Tensile/ 8.8, Zinc, DIN 933.
UNF 1/4", Set Screw (fully threaded), Hexagonal Head, High Tensile (S/ 8.8), Zinc,
Fixaball.co.uk, sells all lengths of UNF 1/4", Hex-Sets in zinc at the best internet prices with free, first class post.
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Lengths available: 1/2", 5/8", 3/4", 7/8", 1".
Set Screw, Hex Head is similar to a hex head, bolt and can be used in a similar way. The difference is that a set is fully threaded and a bolt is not. A bolt has a part-plain shank that will reduce damage to a hole where you will expect movement and vibrations. A set might be used to fix something to a permanent position and has better flexibility with fastening with its’ longer threaded area.
UNIFIED THREAD STANDARDS
The basic American standards for fastening screw threads as agreed upon by standard bodies of Canada, the United Kingdom, and the United States. They are a complete and integrated system of threads for fastening purposes. Their outstanding characteristic is general interchangeability of threads achieved through the standardization of thread form, diameter-pitch combinations, and limits of size
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.
Unified National (UN) is a 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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