bolts › internal wrenching bolts
MS20004-18
Bolt
Description
Bolt
Specifications
| Country of Origin | USA |
|---|---|
| Drive Style | Hexagon |
| Fastener Length | Between 1.610 inches and 1.640 inches |
| Features | Internal Wrenching |
| Grip | 1.125 in |
| Grip Tolerance | ±0.010 in |
| Hardness Rating | 34.0 rockwell c and 40.0 rockwell c |
| Head Diameter | Between 0.428 inches and 0.438 inches |
| Head Height | 0.250 |
| Head Style | Bevel-conical |
| Head Type | Key Locking |
| Industry Standards/Certification | MS20004 |
| Internal Drive Style | Hexagon |
| Material | Steel |
| Material Specification | Mil-s-5626 military specification 1st material response or mil-s-5000 military specification 2nd material response or mil-s-8503 military specification 3rd material response or mil-s-6098 military specification 4th material response or mil-s-6049 military specification 5th material response |
| Min. Tensile Strength (psi) | 160000 pounds per square inch |
| NIIN | 00-206-0847 |
| NSN | 5306-00-206-0847 |
| Suggested Nuts for the Bolts | 42FLW |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416 type 2 cl 3 federal specification all treatment responses |
| Thread Class | 3a |
| Thread Diameter | 0.250 |
| Thread Direction | Right-hand |
| Thread Length | 0.475 |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNF |
| Thread Series Designator | Unf (fine thread) |
| Thread Size | 1/4-28 |
| Total Length | 1.625 in |
| Weight | 0.03 lb |
| Width Across Flats | Between 0.188 inches and 0.190 inches |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS20004-18 — functionally equivalent.
- MS20005-18 Same NSN 1/4-28 · 0.073 in · Bevel-conical · Steel
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Catalog data updated 2026-07-05. Report a data error