The Screw,close Tolerance, cataloged under National Stock Number 5305-01-284-8378, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies Llc Dba PB Fasteners Div PB Fasteners. Government technical data includes 14 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-284-8378 |
| Primary Part Number | PBF1166-5-28 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 2.251 INCHES NOMINAL IN |
| Thread Length | 0.501 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.750 INCHES NOMINAL IN |
| Grip Diameter | 0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| 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 | 24 |
| Material | STEEL COMP H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.429 INCHES MINIMUM AND 0.479 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 |
|---|---|
| PBF1166-5-28 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| H185-5-28 | Huck International, Inc (USA) |
| 121558-5-A28P | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VT1694F5-28 | Howmet Global Fastening Systems Inc (USA) |
| AIC985-5-28 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| C7985-5-28 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 121558-5-A28P | 5/2 Secondary reference U.S. Government activity |
| C7985-5-28 | 7/2 Vendor item drawing reference U.S. Government activity |
| C7985-5-28 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| VT1694F5-28 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-284-8378 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-284-8378 has 5 manufacturer part numbers on file: PBF1166-5-28 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), H185-5-28 (Huck International, Inc), 121558-5-A28P (Sps Technologies, Llc Dba PB Fasteners), VT1694F5-28 (Howmet Global Fastening Systems Inc), AIC985-5-28 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for PBF1166-5-28: Fastener Length: 2.251 INCHES NOMINAL IN; Thread Length: 0.501 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES IN; Head Style: FLAT COUNTERSUNK. 14 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.