Table of Contents
This is an old revision of the document!
REF: Hex Bolt and Socket (Allen) Screw Wrench Sizes
| US Hex Bolt and Socket (Allen) Screw Wrench Size | Metric Hex Bolt and Socket (Allen) Screw Wrench Size | ||||
| Nominal Thread Diameter | Hex Bolt Wrench Size | Hex Socket Wrench Size | Nominal Thread Diameter | Hex Bolt Wrench Size | Hex Socket Wrench Size |
| #6 | 1/4“ | - | M4 | 7mm | 3mm |
| #8 | 1/4” | - | M5 | 8mm | 4mm |
| #10 | 5/16“ | - | M6 | 10mm | 5mm |
| #12 | 5/16” | - | M8 | 13mm | 6mm |
| 1/4“ | 7/16” | 3/16“ | M10 | 17mm | 8mm |
| 5/16” | 1/2“ | 1/4” | M12 | 19mm | 10mm |
| 3/8“ | 9/16” | 5/16“ | M14 | 22mm | 12mm |
| 7/16” | 5/8“ | 3/8” | M16 | 24mm | 14mm |
| 1/2“ | 3/4” | 3/8“ | M18 | 27mm | 14mm |
| 9/16” | 1-3/16“ | 7/16” | M20 | 30mm | 17mm |
| 5/8“ | 1-5/16” | 1/2“ | M22 | 32mm | 17mm |
| 3/4” | 1-1/8“ | 5/8” | M24 | 36mm | 19mm |
| 7/8“ | 1-5/16” | 3/4“ | M30 | 46mm | 22mm |
| 1” | 1-1/2“ | 3/4” | |||
| 1-1/8“ | 1-11/16” | 7/8“ | |||
| 1-1/4” | 1-7/8“ | 7/8” | |||
| 1-3/8“ | 2-1/16” | 1“ | |||
| 1- 1/2” | 2-1/4“ | 1” | |||
| 1-3/4“ | 2-5/8” | 1-1/4“ | |||
| 2” | 3“ | 1-1/2 | |||
