BS 7419 Square Head Square Neck Bolts
M12 - M48
Steel 4.6Grade 8.8
We supply BS 7419 square head square neck bolts in steel grades 4.6 and 8.8, from M12 to M48. The square under-head neck keys into a matching recess so the bolt cannot turn, and the square head suits a flat spanner or holds against an adjacent face - the traditional bolt of fishplates, gates and heavy timber work.
Also known as: square bolt, square square, coach bolt square, square head coach bolt, square neck bolt.
BS 7419 dimensions
| Diameter | Width of square head | Depth of square head | Standard thread length |
|---|---|---|---|
| M12 | 19mm | 8mm | 112mm |
| M16 | 24mm | 10mm | 116mm |
| M20 | 30mm | 12.5mm | 120mm |
| M22 | 32mm | 14mm | 122mm |
| M24 | 36mm | 15mm | 124mm |
| M27 | 41mm | 17mm | 127mm |
| M30 | 46mm | 18.7mm | 130mm |
| M33 | 50mm | 21mm | 133mm |
| M36 | 55mm | 22.5mm | 136mm |
| M39 | 60mm | 25mm | 139mm |
| M42 | 65mm | 26mm | 142mm |
| M45 | 70mm | 28mm | 145mm |
| M48 | 75mm | 30mm | 148mm |
Need BS 7419 in a non-standard size or material?
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