The Screw,close Tolerance, cataloged under National Stock Number 5305-01-478-2844, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 18 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-478-2844 |
| Primary Part Number | TX1027C3-23A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.046 INCHES MAXIMUM IN |
| Fastener Length | 1.7725 INCHES MINIMUM AND 1.7925 INCHES MAXIMUM IN |
| Thread Length | 0.335 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Spline Major Diameter | 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.427 INCHES MINIMUM AND 1.447 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 2200 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORX |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.293 INCHES MINIMUM AND 0.301 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 |
|---|---|
| TX1027C3-23A | Hi-Shear Corporation (USA) |
| TX1027C3-23A | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| TX1027C3-23A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| TX1027C3-23A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027C3-23A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11845-D3-23A | Reid Products Inc. Dba Reid Products Inc (USA) |
| TX1027C3-23A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11825-D3-23A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HP1170C3-23A | Heartland Precision Fasteners Inc (USA) |
| TX1027C3-23A | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| TX1027D3-23A | 5/9 Secondary reference Heartland Precision Fasteners Inc |
| 3M1170-D3-23A | 5/9 Secondary reference The Boeing Company Div Defense |
| 3M1170-C3-23A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| TX1027C3-23A | 5/9 Secondary reference Sps Technologies Inc |
| TX1027C3-23A | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-478-2844 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-478-2844 has 10 manufacturer part numbers on file: TX1027C3-23A (Hi-Shear Corporation), TX1027C3-23A (Fairchild Fasteners Europe - Vsd Gmbh), TX1027C3-23A (Sps Technologies, Llc Dba PB Fasteners), TX1027C3-23A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), TX1027C3-23A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 5 more.
Key specifications for TX1027C3-23A: Head Height: 0.046 INCHES MAXIMUM IN; Fastener Length: 1.7725 INCHES MINIMUM AND 1.7925 INCHES MAXIMUM IN; Thread Length: 0.335 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN; Material Document and Classification: AMS 5662 ASSN STD SINGLE 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.