The Screw,close Tolerance, cataloged under National Stock Number 5305-00-902-6645, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Triman Industries Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-902-6645 |
| Primary Part Number | NAS337CPA54 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Triman Industries Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 5.578 INCHES MINIMUM AND 5.625 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.630 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| 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 | 0.437 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS337 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 4.928 INCHES MINIMUM AND 4.948 INCHES MAXIMUM IN |
| Grip Diameter | 0.4358 INCHES MINIMUM AND 0.4367 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| 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 |
| Head Diameter | 0.880 INCHES MINIMUM AND 0.890 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 |
|---|---|
| NAS337CPA54 | Triman Industries Inc (USA) |
| NAS337CPA54 | Bek, Inc. Dba Level 1 Fasteners (USA) |
| Reference | Meaning |
|---|---|
| NAS337CPA54 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-00-902-6645 is a Screw,close Tolerance, manufactured by Triman Industries Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-902-6645 has 2 manufacturer part numbers on file: NAS337CPA54 (Triman Industries Inc), NAS337CPA54 (Bek, Inc. Dba Level 1 Fasteners).
Key specifications for NAS337CPA54: Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 5.578 INCHES MINIMUM AND 5.625 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL; Thread Length: 0.630 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN. 21 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.