The Screw,close Tolerance, cataloged under National Stock Number 5305-00-815-5051, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-815-5051 |
| Primary Part Number | NAS12047D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 0.739 INCHES MINIMUM AND 0.769 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1204 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.613 INCHES MINIMUM AND 0.663 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.449 INCHES MINIMUM AND 0.507 INCHES MAXIMUM 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 |
|---|---|
| NAS12047D PRIMARY | Hi-Shear Corporation (USA) |
| NAS12044D PRIMARY | Apcom Inc (USA) |
| NAS12047D PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS12047D PRIMARY | Eriks Southwest Inc Dba Montclair Enterprises (USA) |
| NAS12047D | Nor-Cal Supply Co (USA) |
| Reference | Meaning |
|---|---|
| NAS12047D | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS12047D | 5/9 Secondary reference F and C Sales Inc |
| NAS12047D | 5/9 Secondary reference U.S. Government activity |
| NAS12047D | 5/9 Secondary reference Collins Engineering Corp |
| NAS12047D | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS12047D | 5/9 Secondary reference Air Industries Co Inc |
| NAS12047D | 3/2 Design control — primary reference U.S. Government activity |
| NAS1204-7D | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-00-815-5051 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-815-5051 has 5 manufacturer part numbers on file: NAS12047D (Hi-Shear Corporation), NAS12044D (Apcom Inc), NAS12047D (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS12047D (Eriks Southwest Inc Dba Montclair Enterprises), NAS12047D (Nor-Cal Supply Co).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-215-5335. Verify interchangeability with system specifications before substitution.
Key specifications for NAS12047D: Fastener Length: 0.739 INCHES MINIMUM AND 0.769 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM IN; Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL. 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.