The Screw,close Tolerance, cataloged under National Stock Number 5305-01-485-5818, 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 23 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-485-5818 |
| Primary Part Number | TX1026C4-9F |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Spline Minor Diameter | 0.1570 INCHES MINIMUM AND 0.1600 INCHES MAXIMUM IN |
| Fastener Length | 0.9725 INCHES MINIMUM AND 1.0025 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488, TYPE II, CLASS 3 MIL SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMC 5662, INCONEL 718 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Spline Major Diameter | 0.2195 INCHES MINIMUM AND 0.2225 INCHES MAXIMUM IN |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Grip Length | 0.5525 INCHES MINIMUM AND 0.5725 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM AND CHROMATE OVERALL |
| Internal Drive Style | TORX |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.470 INCHES MINIMUM AND 0.477 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 | Y |
| Part Number | Manufacturer |
|---|---|
| TX1026C4-9F PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| TX1026C4-9F PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| TX1026C4-9F | Howmet Global Fastening Systems Inc (USA) |
| 3M1169C4-9F PRIMARY | The Boeing Company Div Defense (USA) |
| TX1026C4-9F | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1026C4-9F PRIMARY | Hi-Shear Corporation (USA) |
| TX1026C4-9F | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| TX1026C4-9F PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11827C4-9F | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| TX1026C4-9F | 5/9 Secondary reference Sps Technologies Inc |
| TX1026C4-9F | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-485-5818 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-485-5818 has 9 manufacturer part numbers on file: TX1026C4-9F (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), TX1026C4-9F (Sps Technologies, Llc Dba PB Fasteners), TX1026C4-9F (Howmet Global Fastening Systems Inc), 3M1169C4-9F (The Boeing Company Div Defense), TX1026C4-9F (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 4 more.
Key specifications for TX1026C4-9F: Spline Minor Diameter: 0.1570 INCHES MINIMUM AND 0.1600 INCHES MAXIMUM IN; Fastener Length: 0.9725 INCHES MINIMUM AND 1.0025 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488, TYPE II, CLASS 3 MIL SPEC ALL TREATMENT RESPONSES OVERALL; Thread Length: 0.425 INCHES NOMINAL IN. 23 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.