The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-207-6740, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-207-6740 |
| Primary Part Number | 212783 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Extended Washer Thickness | 0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Head Height | 0.334 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN |
| Fastener Length | 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Thread Length | 0.677 INCHES MINIMUM AND 0.757 INCHES MAXIMUM IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | DOUBLE HEXAGON FLATS |
| First Diameter From Head | 0.267 INCHES MINIMUM AND 0.272 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.362 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.628 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 8740 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Hole Type | DRILLED |
| Hole Diameter | 0.062 INCHES NOMINAL IN |
| 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 |
|---|---|
| 212783 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 212783 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-207-6740 is a Bolt,externally Relieved Body, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-207-6740 has 1 manufacturer part number on file: 212783 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 212783: Extended Washer Thickness: 0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN; Head Height: 0.334 INCHES MINIMUM AND 0.354 INCHES MAXIMUM IN; Fastener Length: 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN; Extended Washer Diameter: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN. 22 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.