The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-385-9201, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is M.s. Aerospace Inc. Dba Ms Aerospace Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-385-9201 |
| Primary Part Number | 4037566 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | M.s. Aerospace Inc. Dba Ms Aerospace Inc |
| Status | ACTIVE |
| Fastener Length | 1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN |
| Thread Length | 0.650 INCHES MINIMUM AND 0.754 INCHES MAXIMUM IN |
| Hardness Rating | 34.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS 5708 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.330 INCHES MINIMUM AND 0.331 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.976 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.095 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 175000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 115000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.570 INCHES NOMINAL FIRST HOLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 4037566 | Necchi Spa (ITA) |
| 4037566 | Rtx Corporation Div Pratt & Whitney (USA) |
| 4037566 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 4037566 PRIMARY | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| Reference | Meaning |
|---|---|
| 4037566 | 5/9 Secondary reference Maycor Appliance Parts and Service Co Div of Maytag Corp |
| 4037566 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
| 4037566 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-385-9201 is a Bolt,externally Relieved Body, manufactured by M.s. Aerospace Inc. Dba Ms Aerospace Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-385-9201 has 4 manufacturer part numbers on file: 4037566 (Necchi Spa), 4037566 (Rtx Corporation Div Pratt & Whitney), 4037566 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 4037566 (M.s. Aerospace Inc. Dba Ms Aerospace Inc).
Key specifications for 4037566: Fastener Length: 1.710 INCHES MINIMUM AND 1.730 INCHES MAXIMUM IN; Thread Length: 0.650 INCHES MINIMUM AND 0.754 INCHES MAXIMUM IN; Hardness Rating: 34.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL; Shank Unthreaded Hole Diameter: 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN. 18 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.