bolts › machine bolts
AN5-45A
Aeronautical Standard Machine Bolt
Description
Hex head aircraft bolts are made of high-strength type 4037 or 8740 alloy steel (type 8740 is most commonly used). The bolts are centerless ground and threaded after heat treatment. Minimum tensile strength 125,000 PSI. Cadmium plated per specification QQ-P-416A, Type II, Class 3. Available with shank drilled for cotter pin or undrilled for stop nut application, and with or without drilled head for safety wire. Specify bolts to have undrilled shank by adding letter "A" after the dash number. For bolts with drilled head add letter "H" after the AN number. See illustrated examples. "C" represents Type 431 Stainless Steel (contains iron which is magnetic). The length of AN aircraft bolts is measured from under the head to the end of the shank. The "grip" is the unthreaded portion of the shank. See table for conversion of length and/or grip to proper AN callout. 15% discount on qty of 50-99 20% discount on qty of 100+ Note: Drilled bolts listed above are drilled shank only. To order drilled head only or both drilled head and shank bolts, please use our AN Bolt Selector by clicking the link below
Specifications
| Fastener Length | 4.703 inches minimum and 4.750 inches maximum |
|---|---|
| Features Provided | Finished head |
| Grip Length | 4 3/16, 4.172 inches minimum and 4.203 inches maximum |
| Hardness Rating | 26.0 rockwell c minimum and 32.0 rockwell c maximum |
| Head Height | 0.172 inches minimum and 0.204 inches maximum |
| Head Style | Hexagon Head |
| Length | 4 3/4 |
| Material | Steel |
| Min. Tensile Strength (psi) | 125000 pounds per square inch |
| Nominal Length | 4 23/32 |
| Surface Treatment | Cadmium and dichromate |
| Thread Class | 3a |
| Thread Diameter | 0.312 |
| Thread Direction | Right-hand |
| Thread Length | 0.531 inches minimum |
| Thread Qty | 24 |
| Thread Qty Per Inch (tpi) | 24 |
| Thread Series Designator | UNF |
| Thread Size | 1/4 |
| Width Between Flats | 0.490 inches minimum and 0.502 inches maximum |
Cross-reference
No interchangeable or dimensionally similar parts are on record for AN5-45A. Try the cross-reference lookup to search by a different part number.
Catalog data updated 2026-07-05. Report a data error