The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-01-185-5857, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Honeywell Intl Inc Defense Avionics Systems. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-185-5857 |
| Primary Part Number | 2797921-2 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Honeywell Intl Inc Defense Avionics Systems |
| Status | ACTIVE |
| Head Height | 0.223 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN |
| Fastener Length | 1.387 INCHES MINIMUM AND 1.403 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.372 INCHES MINIMUM AND 0.408 INCHES MAXIMUM IN |
| Hardness Rating | 55.0 ROCKWELL C MINIMUM OVERALL |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.160 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 0.303 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.760 INCHES MINIMUM AND 0.780 INCHES MAXIMUM IN |
| Width Between Flats | 0.555 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.261 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 3 |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 440F OVERALL |
| Third Diameter From Head | 0.995 INCHES MINIMUM AND 1.015 INCHES MAXIMUM IN |
| Thread Series Designator | UNF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2797921-2 PRIMARY | Honeywell Intl Inc Defense Avionics Systems (USA) |
| Reference | Meaning |
|---|---|
| 2797921-2 | 5/9 Secondary reference Leonardo Mw Ltd |
NSN 5306-01-185-5857 is a Bolt,externally Relieved Body, manufactured by Honeywell Intl Inc Defense Avionics Systems, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-185-5857 has 1 manufacturer part number on file: 2797921-2 (Honeywell Intl Inc Defense Avionics Systems).
Key specifications for 2797921-2: Head Height: 0.223 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN; Fastener Length: 1.387 INCHES MINIMUM AND 1.403 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.372 INCHES MINIMUM AND 0.408 INCHES MAXIMUM IN. 21 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.