The Screw,close Tolerance, cataloged under National Stock Number 5305-00-486-2191, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Qualified Air Components Inc.. Government technical data includes 22 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-486-2191 |
| Primary Part Number | NAS1124-8 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Qualified Air Components Inc. |
| 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 | 0.133 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Fastener Length | 0.801 INCHES MINIMUM AND 0.831 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2403 ASSN STD 1ST TREATMENT RESPONSE AND QQ-P-416,TY 2 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Thread Length | 0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM 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 OR AMS 6300 ASSN STD 6TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | NICKEL AND 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 | 28 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 4037 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.365 INCHES MINIMUM AND 0.375 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 |
|---|---|
| NAS1124-8 PRIMARY | Qualified Air Components Inc. (USA) |
| NAS1124-8 PRIMARY | Hi-Shear Corporation (USA) |
| NAS1124-8 PRIMARY | Huck International, Inc (USA) |
| NAS1124-8 | Nor-Cal Supply Co (USA) |
| NAS1124-8 PRIMARY | Apcom Inc (USA) |
| NAS1124-8 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1124-8 | Plastic and Metal Products Corporation (USA) |
| NAS1124-8 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| NAS1124-8 | 5/9 Secondary reference F and C Sales Inc |
| NAS1124-8 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS1124-8 | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1124-8 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1124-8 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1124-8 | 5/9 Secondary reference U.S. Government activity |
| NAS1124-8 | 3/2 Design control — primary reference U.S. Government activity |
| NAS1124-8 | 5/9 Secondary reference Air Industries Co Inc |
NSN 5305-00-486-2191 is a Screw,close Tolerance, manufactured by Qualified Air Components Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-00-486-2191 has 8 manufacturer part numbers on file: NAS1124-8 (Qualified Air Components Inc.), NAS1124-8 (Hi-Shear Corporation), NAS1124-8 (Huck International, Inc), NAS1124-8 (Nor-Cal Supply Co), NAS1124-8 (Apcom Inc) and 3 more.
Key specifications for NAS1124-8: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.133 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN. 22 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.