Race Rally Supplies
Imperial UNF Cap Head Bolt – High Tensile 12.9
Imperial UNF Cap Head Bolt – High Tensile 12.9
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Mix & match across our nuts, bolts & fasteners – discount applied automatically in your basket.
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Sold individually – the price shown is for one bolt.
Grade 12.9 high-tensile socket cap head bolts with fine UNF threads. 12.9 is the highest common strength grade for alloy steel bolts, so these suit brackets, mounts and chassis parts where a standard bolt is not strong enough. The compact cylindrical head is tightened with an Allen (hex) key, ideal where there is no room for a spanner.
How to choose
10/32 = 10-32 UNF (approx. 3/16")
1/4 = 1/4"-28 UNF
5/16 = 5/16"-24 UNF
3/8 = 3/8"-24 UNF
7/16 = 7/16"-20 UNF
Lengths are in inches, measured from under the head to the tip. Add up the thickness of everything being clamped, plus the nut, and allow 2–3 threads showing past the nut.
Length conversion
| Listed as | Fraction | Approx. mm |
|---|---|---|
| .375" | 3/8" | 9.5 |
| .500" | 1/2" | 12.7 |
| .625" | 5/8" | 15.9 |
| .750" | 3/4" | 19.1 |
| 1.000" | 1" | 25.4 |
| 1.250" | 1-1/4" | 31.8 |
| 1.500" | 1-1/2" | 38.1 |
| 1.750" | 1-3/4" | 44.5 |
| 2.000" | 2" | 50.8 |
| 2.250" | 2-1/4" | 57.2 |
| 2.500" | 2-1/2" | 63.5 |
| 2.750" | 2-3/4" | 69.9 |
| 3.000" | 3" | 76.2 |
| 3.500" | 3-1/2" | 88.9 |
| 4.000" | 4" | 101.6 |
Not every length is available in every thread – unavailable combinations are greyed out above.
Frequently asked questions
Is the price per bolt or per pack?
Per bolt. Set the quantity to the number you need.
Which nut should I use?
Our AN Quality Nyloc nuts match these UNF threads.
Can I order this if it shows as out of stock?
Yes. We will confirm the expected lead time after you order.
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