The Screw,close Tolerance, cataloged under National Stock Number 5305-00-445-5299, 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 17 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-445-5299 |
| Primary Part Number | HT195-4-6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 0.756 INCHES MINIMUM AND 0.803 INCHES MAXIMUM IN |
| Thread Length | 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| 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 | 0.497 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 |
|---|---|
| HT195-4-6 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| HT195-4-6 PRIMARY | Hi-Shear Corporation (USA) |
| 3M263-4-6 | Howmet Global Fastening Systems Inc (USA) |
| 3M263-4-6 | Howmet Global Fastening Systems Inc (USA) |
| HT195-4-6 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M263-4-6 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT195-4-6 | Satair A/s (DNK) |
| Reference | Meaning |
|---|---|
| 66117H4-6 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HS2623-4Z6 | 5/9 Secondary reference U.S. Government activity |
| HS2623-4Z6 | 5/9 Secondary reference Huck International, Inc |
| 3M263-4-6 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 66117H4-6 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-00-445-5299 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-445-5299 has 7 manufacturer part numbers on file: HT195-4-6 (Fairchild Fasteners Europe - Vsd Gmbh), HT195-4-6 (Hi-Shear Corporation), 3M263-4-6 (Howmet Global Fastening Systems Inc), 3M263-4-6 (Howmet Global Fastening Systems Inc), HT195-4-6 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 2 more.
Key specifications for HT195-4-6: Fastener Length: 0.756 INCHES MINIMUM AND 0.803 INCHES MAXIMUM IN; Thread Length: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Hardness Rating: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL; Nominal Thread Diameter: 0.250 INCHES IN. 17 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.