The Screw,close Tolerance, cataloged under National Stock Number 5305-01-083-2298, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-083-2298 |
| Primary Part Number | BM19045-4A8 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 0.777 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | NAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837,TY 2 CL 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| Thread Length | 0.267 INCHES MINIMUM AND 0.334 INCHES MAXIMUM IN |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| 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 |
| Specification/standard Data | 26512-GB510N MANUFACTURERS STANDARD |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR 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 | 0.447 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 |
|---|---|
| HT326-4A8 | Hi-Shear Corporation (USA) |
| HT326-4A8 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BM19045-4A8 PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| GB510N4A8 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| SFH22D4A8 | 5/9 Secondary reference U.S. Government activity |
| SFH22D4A8 | 5/9 Secondary reference Standard Pressed Steel Co Aircraft Products Div |
| SFH22D4A8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BM19045-4A8 | 5/9 Secondary reference Deutsch Fastener Corp |
| HT8181F4-8 | 5/2 Secondary reference U.S. Government activity |
| BM19045-4A8 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-083-2298 is a Screw,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-083-2298 has 3 manufacturer part numbers on file: HT326-4A8 (Hi-Shear Corporation), HT326-4A8 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BM19045-4A8 (Huck International, Inc).
Key specifications for BM19045-4A8: Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.777 INCHES MINIMUM AND 0.824 INCHES MAXIMUM IN; Surface Treatment Document and Classification: NAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837,TY 2 CL 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL; Thread Length: 0.267 INCHES MINIMUM AND 0.334 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.