The Screw,externally Relieved Body, cataloged under National Stock Number 5305-00-142-4675, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Unicorp.. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-142-4675 |
| Primary Part Number | 577R005H20 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Unicorp. |
| Status | ACTIVE |
| Head Height | 0.075 INCHES MAXIMUM IN |
| Fastener Length | 0.670 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN |
| Material Document and Classification | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| First Diameter From Head | 0.091 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | PAN |
| Thread Direction | RIGHT-HAND |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.430 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4130 OR STEEL COMP 4140 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.215 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 |
|---|---|
| 577R005H20 PRIMARY | Unicorp. (USA) |
| P81-632-4 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| P81-632-4 | Satair A/s (DNK) |
| 577R005H20 PRIMARY | Fastener Technology Corp (USA) |
| Reference | Meaning |
|---|---|
| 577R005H20 | 7/2 Vendor item drawing reference U.S. Government activity |
| 577R005H20 | 5/9 Secondary reference Helical Lap Company (inc) Dba Helical Lap & Manufacturing Co |
NSN 5305-00-142-4675 is a Screw,externally Relieved Body, manufactured by Unicorp., classified under FSC 5305, Screws. Status: active.
NSN 5305-00-142-4675 has 4 manufacturer part numbers on file: 577R005H20 (Unicorp.), P81-632-4 (Fairchild Fasteners Europe - Vsd Gmbh), P81-632-4 (Satair A/s), 577R005H20 (Fastener Technology Corp).
Key specifications for 577R005H20: Head Height: 0.075 INCHES MAXIMUM IN; Fastener Length: 0.670 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL; Thread Length: 0.235 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN. 19 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.