The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-873-7844, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-873-7844 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Extended Washer Thickness | 0.113 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN |
| Head Height | 0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN |
| Fastener Length | 3.476 INCHES MINIMUM AND 3.506 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN |
| Thread Length | 0.571 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 2.865 INCHES MINIMUM AND 2.905 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.420 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN |
| Width Between Flats | 0.556 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 2.590 INCHES MINIMUM AND 2.610 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 2 |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Test Data Document | 81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OR STEEL COMP 4340 OVERALL |
| 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 | F |
| Reference | Meaning |
|---|---|
| 204-011-171-003 | 5/2 Secondary reference U.S. Government activity |
| 204-011-171-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-873-7844 is a Bolt,externally Relieved Body, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-873-7844: Extended Washer Thickness: 0.113 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN; Head Height: 0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN; Fastener Length: 3.476 INCHES MINIMUM AND 3.506 INCHES MAXIMUM IN; Extended Washer Diameter: 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN. 23 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.