The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-858-0778, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-858-0778 |
| Primary Part Number | S6165-20266 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Head Height | 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN |
| Fastener Length | 0.406 INCHES NOMINAL IN |
| Thread Length | 0.346 INCHES NOMINAL IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM OVERALL |
| Hole Configuration Style | HEXAGON CORNERS |
| Style Designator | CONCENTRIC HOLE UNTHREADED |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.375 INCHES NOMINAL IN |
| Concentric Hole Diameter | 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 410 OVERALL |
| Hole Quantity | 2 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.032 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 |
|---|---|
| S6165-20266 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S6165-20266 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| S6165-20266 | Hartford Aircraft Products, Inc (USA) |
| S6165-20266 | B. & R. Machine & Tool Corp (USA) |
| Reference | Meaning |
|---|---|
| S6165-20266 | 5/9 Secondary reference Alco Machine Co Inc |
NSN 5306-00-858-0778 is a Bolt,internally Relieved Body, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-858-0778 has 4 manufacturer part numbers on file: S6165-20266 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), S6165-20266 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), S6165-20266 (Hartford Aircraft Products, Inc), S6165-20266 (B. & R. Machine & Tool Corp).
Key specifications for S6165-20266: Head Height: 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN; Fastener Length: 0.406 INCHES NOMINAL IN; Thread Length: 0.346 INCHES NOMINAL IN; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM OVERALL. 20 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.