The Screw,close Tolerance, cataloged under National Stock Number 5305-01-083-2299, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-083-2299 |
| Primary Part Number | HT326-4A9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 0.840 INCHES MINIMUM AND 0.887 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 | 0.268 INCHES MINIMUM AND 0.335 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 | 0.552 INCHES MINIMUM AND 0.572 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 |
|---|---|
| HT326-4A9 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT326-4A9 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| BM19045-4A9 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| GB510N4A9 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| SFH22D4A9 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT8181F4-9 | 5/2 Secondary reference U.S. Government activity |
| BM19045-4A9 | 5/9 Secondary reference U.S. Government activity |
| SFH22D4A9 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-083-2299 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-083-2299 has 2 manufacturer part numbers on file: HT326-4A9 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT326-4A9 (Hi-Shear Corporation).
Key specifications for HT326-4A9: Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.840 INCHES MINIMUM AND 0.887 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: 0.268 INCHES MINIMUM AND 0.335 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.