The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-083-0127, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Apcom Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 10 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-083-0127 |
| Primary Part Number | NAS1189-4T16K |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Apcom Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.792 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1189 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Locking Feature | PELLET OR STRIP THREADS |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.491 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 |
|---|---|
| NAS1189-4T16K | Nor-Cal Supply Co (USA) |
| NAS1189-4T16K PRIMARY | Apcom Inc (USA) |
| NAS1189-4T16K PRIMARY | Hi-Shear Corporation (USA) |
| NAS1189-4T16K PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| NAS1189-4T16K PRIMARY | Long-Lok Llc (USA) |
| NAS1189-4T16K | Plastic and Metal Products Corporation (USA) |
| NAS1189-4T16K | Hardware Specialty Co. Inc. Dba Hardware Specialty Co Inc (USA) |
| NAS1189-4T16K PRIMARY | Huck International, Inc (USA) |
| NAS1189-4T16K PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| NAS1189-4T16K PRIMARY | Nd Industries Inc Div Eastern Division (USA) |
| Reference | Meaning |
|---|---|
| NAS1189-4T16K | 5/9 Secondary reference U.S. Government activity |
| NAS1189-4T16K | 3/2 Design control — primary reference U.S. Government activity |
| NAS1189-4T16K | 5/9 Secondary reference F and C Sales Inc |
| NAS1189-4T16K | 3/2 Design control — primary reference U.S. Government activity |
| NAS1189-4T16L | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| NAS1189-4T16K | 3/2 Design control — primary reference U.S. Government activity |
| NAS1189-4T16K | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| NAS1189-4T16K | 5/9 Secondary reference Lawrence Engineering and Supply Inc |
| NAS1189-4T16K | 5/9 Secondary reference Air Industries Co Inc |
NSN 5305-01-083-0127 is a Screw,cap,socket Head, manufactured by Apcom Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-083-0127 has 10 manufacturer part numbers on file: NAS1189-4T16K (Nor-Cal Supply Co), NAS1189-4T16K (Apcom Inc), NAS1189-4T16K (Hi-Shear Corporation), NAS1189-4T16K (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), NAS1189-4T16K (Long-Lok Llc) and 5 more.
Key specifications for NAS1189-4T16K: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 20 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.