UNC, 8-32 x 3/4, Socket Screw, Countersunk, High Tensile/ S/ 10.9, BS 2470, 10 pack.

UNC 8-32 x 3/4", Countersink Head, Socket Screw/ Allen Bolt, High Tensile (10.9), BS 2470 Here at Fixaball, we stock all sizes and lengths of 8-32, UNC socket countersunk fasteners...
£6.49

UNC 8-32 x 3/4", Countersink Head, Socket Screw/ Allen Bolt, High Tensile (10.9), BS 2470

Here at Fixaball, we stock all sizes and lengths of 8-32, UNC socket countersunk fasteners at the best internet prices and free delivery

Orders placed before 2pm are usually dispatched same day (Mon-Fri).

Please make your size and pack quantity selection from the drop down menus at the top of the page.

Socket Countersunk Screws come as 'sets' and 'bolts'. The, ‘SET’, term is used to describe a fastener that is fully threaded in lengths up to and around 1-2 inches, from the underside of the head (widest point of the head). Over 1-2 inches in length the fastener will have a, 'shoulder,' or unthreaded area under the head (plain shank). This space of unthreaded area confirms that the fastener is now a bolt (cap head, bolt in this case) and is shouldered. Some people might simply call them Allen or, 'Allan bolts,' in association with the Allen, Hexagonal Key which is used to tighten and loosen the fastener. So, ‘Socket,’ refers to the hexagon shaped indentation found on the top of the fasteners’ head.

Countersunk Head

The length of a countersunk fixing/ fastener is always from tip to the top.

Material

Material/ Finish

Appearance

Level of Corrosion Resistance

Typical Application

High Tensile Steel (10.9)

Self-Colour (black with no surface treatment)

Low, without further surface treatment

· No exposure to moisture

· Often Greased/ Oiled

 

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) 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.

Image is for illustrative purposes only.