UNC, 8/32, Socket Screw, Countersunk, High Tensile/ S/ 10.9, BS 2470
UNC 8 (32 T.P.I.), Coarse Pitch, High Tensile (Grade 'S'/ 10.9), Self Colour. Allen (hexagon) Socket, Countersunk Head, Allen Screw/ Bolt, ISO 10642, B18.3, BS 2470
Fixaball sells all lengths of 8-32, UNC socket countersunk, 10.9 Grade. High Tensile fasteners.
Socket Countersunk Screws come as 'sets' and 'bolts'. The, ‘SET’, term is used to describe a fastener that is fully threaded. Over a certain length (around 2.5 x the diameter) the 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 (socket countersunk bolt in this case) and is shouldered. Some people might simply call them socket 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.
The length of a countersunk fixing/ fastener is always from tip to the top.
Orders placed before 2pm are dispatched same day (Mon-Fri).
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.
Please make your, 'No. of Items in Pack', 'Length', and pack 'Quantity' selection from the drop down menus.
UNC 8/32, Countersunk Head, Socket Screw/ Allen Bolt Lengths Available
FT - Fully Threaded
PT - Partially Threaded
|#8-32x1/4",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x5/16",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x7/16",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x1/2",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x3/4",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x7/8",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x1",(FT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x1 1/2",(PT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
|#8-32x2",(PT) SOCKET COUNTERSUNK HEAD SCREWS UNC ALLOY SELF COLOUR|
Level of Corrosion Resistance
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.