The Screw,close Tolerance, cataloged under National Stock Number 5305-01-028-0184, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Eriks Southwest Inc Dba Montclair Enterprises. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-028-0184 |
| Primary Part Number | NAS1203-18D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Eriks Southwest Inc Dba Montclair Enterprises |
| Status | ACTIVE |
| Fastener Length | 1.386 INCHES MINIMUM AND 1.416 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.251 INCHES MINIMUM AND 0.301 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN |
| 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 | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1203 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM 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 | CROSS RECESS TYPE 1 |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| 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) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.259 INCHES MINIMUM AND 1.309 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.328 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 |
|---|---|
| NAS1203-18D PRIMARY | Eriks Southwest Inc Dba Montclair Enterprises (USA) |
| NAS1203-18D PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1203-18D PRIMARY | Hi-Shear Corporation (USA) |
| NAS1203-18D PRIMARY | Apcom Inc (USA) |
| NAS1203-18D | Nor-Cal Supply Co (USA) |
| Reference | Meaning |
|---|---|
| NAS1203-18D | 3/2 Design control — primary reference U.S. Government activity |
| NAS1203-18D | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1203-18D | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS1203-18D | 3/2 Design control — primary reference U.S. Government activity |
| NAS1203-18D | 5/9 Secondary reference U.S. Government activity |
| NAS1203-18D | 5/9 Secondary reference F and C Sales Inc |
| NAS1203-18D | 5/9 Secondary reference Air Industries Co Inc |
| NAS1203-18D | 5/9 Secondary reference Collins Engineering Corp |
NSN 5305-01-028-0184 is a Screw,close Tolerance, manufactured by Eriks Southwest Inc Dba Montclair Enterprises, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-028-0184 has 5 manufacturer part numbers on file: NAS1203-18D (Eriks Southwest Inc Dba Montclair Enterprises), NAS1203-18D (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS1203-18D (Hi-Shear Corporation), NAS1203-18D (Apcom Inc), NAS1203-18D (Nor-Cal Supply Co).
Key specifications for NAS1203-18D: Fastener Length: 1.386 INCHES MINIMUM AND 1.416 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.251 INCHES MINIMUM AND 0.301 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE 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.