Description
UNF 5/16″ (24 T.P.I.), Fine Pitch, High Tensile (Grade 10.9), Self Colour. Allen (hex) Socket, Countersunk Head, Allen Screw/ Bolt, ISO 10642, B18.3, BS 2470
Fixaballsells all lengths of 5/16″, UNF, countersunk socket screw bolts.
Hex/ Allen Socket Countersunk Screw/ Bolts
Countersunk fasteners are designed to fit flush on the connecting surface when fully tightened. They are tightened and loosened with an allen/ hex key drive.
How to measure a countersunkfixing/ fastener
The length of a countersunk fixing/ fastener is always from tip to the top.
Orders placed before 2pm are dispatchedsame 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, ‘Quantity‘ of packs selection from the drop down menus.
UNF, 5/16″Allen Socket, CountersunkScrew/ Bolt lengths at Fixaball:
FT– Fully Threaded
PT– Partially Threaded
| 5/16″-24×1/2″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×3/4″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×7/8″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×1″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×1 1/4″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×1 1/2″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×1 3/4″,(FT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×2″,(PT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×2 1/4″,(PT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
| 5/16″-24×2 1/2″,(PT) SOCKET COUNTERSUNK HEAD SCREWS UNF ALLOY SELF COLOUR |
High Tensile 10.9 Grade.
Available Finish: Plain/ Black/ Self Colour
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Fixaball Specialist Fixings and Fasteners UNC/UNF Countersunk Socket Screw/ Bolt Diameters and T.P.I.’s Conforming toISO 10642, B18.3, BS 2470 |
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Thread Pitch (Threads Per Inch/ T.P.I.) |
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Diameter |
UNC |
UNF |
|
No. 4 |
40 |
48 |
|
No. 5 |
40 |
44 |
|
No. 6 |
32 |
40 |
|
No. 8 |
32 |
36 |
|
No. 10 |
24 |
32 |
|
20 |
28 |
|
|
5/16 |
18 |
24 |
|
3/8 |
16 |
24 |
|
7/16 |
14 |
20 |
|
13 |
20 |
|
|
5/8 |
11 |
18 |
|
10 |
16 |
|
|
7/8 |
9 |
14 |
|
1 |
8 |
12 |
|
1.1/4 |
7 |
12 |
|
1.1/2 |
6 |
12 |
Self Colour, High Tensile 10.9 Material Properties
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Material/ Finish |
Appearance |
Level of Corrosion Resistance |
Typical Application |
|
High Tensile Steel (10.9) |
Self-Colour (black) |
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 (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 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.
Image is for illustrative purposes only.
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