The Screw,close Tolerance, cataloged under National Stock Number 5305-00-889-2864, 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 23 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-889-2864 |
| Primary Part Number | NAS1143-8 |
| 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 |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.103 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN |
| Fastener Length | 0.761 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.276 INCHES MINIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.192 INCHES IN |
| Head Style | PAN |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1143 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 0.500 INCHES NOMINAL IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.361 INCHES MINIMUM AND 0.385 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 |
|---|---|
| NAS1143-8 | Boeing Distribution Services SAS (FRA) |
| NAS1143-8 PRIMARY | Hi-Shear Corporation (USA) |
| NAS1143-8 PRIMARY | Apcom Inc (USA) |
| NAS1143-8 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| NAS1143-8 | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site (ITA) |
| NAS1143-8 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1143-8 PRIMARY | Plastic and Metal Products Corporation (USA) |
| NAS1143-8 PRIMARY | Nor-Cal Supply Co (USA) |
| Reference | Meaning |
|---|---|
| NAS1143-8 | 5/9 Secondary reference U.S. Government activity |
| NAS1143-8 | 5/9 Secondary reference Klx Aerospace Solutions II SAS |
| NAS1143-8 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1143-8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS1143-8 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1143-8 | 5/9 Secondary reference Air Industries Co Inc |
| NAS1143-8 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1143-8 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1143-8 | 5/9 Secondary reference F and C Sales Inc |
NSN 5305-00-889-2864 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-889-2864 has 8 manufacturer part numbers on file: NAS1143-8 (Boeing Distribution Services SAS), NAS1143-8 (Hi-Shear Corporation), NAS1143-8 (Apcom Inc), NAS1143-8 (Fastener Innovation Technology, Inc. Dba F I T), NAS1143-8 (Leonardo Spa Aeronautics Division - Pomigliano D'arco Site) and 3 more.
Key specifications for NAS1143-8: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.103 INCHES MINIMUM AND 0.118 INCHES MAXIMUM IN. 23 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.