The Screw,close Tolerance, cataloged under National Stock Number 5305-01-458-4851, 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 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-458-4851 |
| Primary Part Number | PBF1570-5-20L |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 1.817 INCHES MINIMUM AND 1.847 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.532 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN |
| Material Document and Classification | SMD 584 NATIONAL SPEC 15TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 132000 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 | 24 |
| Material | COBALT COMP MP-35-N OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.573 INCHES MINIMUM AND 0.630 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 |
|---|---|
| HR257-5-20L | Hi-Shear Corporation (USA) |
| PBF1570-5-20L PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 03A415-5-20L | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| HR257-5-20L | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| 125300-5-20L | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-458-4851 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-458-4851 has 4 manufacturer part numbers on file: HR257-5-20L (Hi-Shear Corporation), PBF1570-5-20L (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 03A415-5-20L (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), HR257-5-20L (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for PBF1570-5-20L: Fastener Length: 1.817 INCHES MINIMUM AND 1.847 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.532 INCHES MINIMUM AND 0.582 INCHES MAXIMUM IN; Material Document and Classification: SMD 584 NATIONAL SPEC 15TH MATERIAL RESPONSE OVERALL. 18 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.