The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-01-298-2438, 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 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-298-2438 |
| Primary Part Number | ST1420-08 |
| 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 | 0.060 INCHES MINIMUM IN |
| Head Height | 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN |
| Fastener Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Thread Length | 0.516 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN |
| First Diameter From Head | 0.222 INCHES MINIMUM AND 0.232 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.312 INCHES NOMINAL IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.099 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| ST1420-08 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| ST1420-08 | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| ST1420-08 | 5/9 Secondary reference M.s. Aerospace Inc. Dba Ms Aerospace Inc |
| 5306PL1498942 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5306-01-298-2438 is a Bolt,externally Relieved Body, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-298-2438 has 2 manufacturer part numbers on file: ST1420-08 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), ST1420-08 (Rtx Corporation Div Pratt & Whitney).
Key specifications for ST1420-08: Extended Washer Thickness: 0.060 INCHES MINIMUM IN; Head Height: 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN; Fastener Length: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN; Extended Washer Diameter: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN. 16 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.