The Screw,close Tolerance, cataloged under National Stock Number 5305-01-246-3871, 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 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-246-3871 |
| Primary Part Number | HR204-4-12 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 1.146 INCHES MINIMUM AND 1.193 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | NAS672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837,TYPE 2 CLASS 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| Thread Length | 0.386 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 220000 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 H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.464 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 |
|---|---|
| HR204-4-12 PRIMARY | Hi-Shear Corporation (USA) |
| HR204-4-12 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| PBF1202-4-12 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| SC1779-4-12 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| GB510CE4-12 | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 106706T-4-12 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-246-3871 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-246-3871 has 5 manufacturer part numbers on file: HR204-4-12 (Hi-Shear Corporation), HR204-4-12 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), PBF1202-4-12 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), SC1779-4-12 (Howmet Global Fastening Systems Inc), GB510CE4-12 (Northrop Grumman Systems Corporation).
Key specifications for HR204-4-12: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 1.146 INCHES MINIMUM AND 1.193 INCHES MAXIMUM IN; Surface Treatment Document and Classification: NAS672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837,TYPE 2 CLASS 2 MIL SPEC 2ND TREATMENT RESPONSE 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.