The Screw,close Tolerance, cataloged under National Stock Number 5305-01-512-8274, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Heartland Precision Fasteners Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 19 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-512-8274 |
| Primary Part Number | 3M1170C4-9AF |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Spline Minor Diameter | 0.1105 INCHES MINIMUM AND 0.1125 INCHES MAXIMUM IN |
| Fastener Length | 0.973 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-83488,TYPE II,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Spline Major Diameter | 0.1540 INCHES MINIMUM AND 0.1560 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.553 INCHES MINIMUM AND 0.573 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM 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 | 0.265 INCHES MINIMUM AND 0.272 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 |
|---|---|
| TX1027C4-9AF | Hi-Shear Corporation (USA) |
| TX1027C4-9AF | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027C4-9AF | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1170C4-9AF | Houston Precision Fasteners I Lp (USA) |
| 3M1170C4-9AF PRIMARY | Heartland Precision Fasteners Inc (USA) |
| TX1027C4-9AF | Howmet Global Fastening Systems Inc (USA) |
| TX1027C4-9AF | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| TX1027C4-9AF | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1170C4-9AF PRIMARY | The Boeing Company Div Defense (USA) |
| 3M1170C4-9AF PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M1170C4-9AF PRIMARY | Saturn Fasteners Inc (USA) |
| 11825C4-9AF | Reid Products Inc. Dba Reid Products Inc (USA) |
| GS1014C4-9AF PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M1170C4-9AF PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M1170C4-9AF | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| TX1027C4-9AF | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC1170C4-9AF | West Coast Aerospace, Inc. (USA) |
| TX1027C4-9AF | Huck International, Inc (USA) |
| 11845C4-9AF PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| TX1027C4-9AF | 5/2 Secondary reference U.S. Government activity |
| TX1027C4-9AF | 5/2 Secondary reference U.S. Government activity |
| TX1027C4-9AF | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-512-8274 is a Screw,close Tolerance, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-512-8274 has 19 manufacturer part numbers on file: TX1027C4-9AF (Hi-Shear Corporation), TX1027C4-9AF (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), TX1027C4-9AF (Sps Technologies, Llc Dba PB Fasteners), 3M1170C4-9AF (Houston Precision Fasteners I Lp), 3M1170C4-9AF (Heartland Precision Fasteners Inc) and 14 more.
Key specifications for 3M1170C4-9AF: Spline Minor Diameter: 0.1105 INCHES MINIMUM AND 0.1125 INCHES MAXIMUM IN; Fastener Length: 0.973 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-83488,TYPE II,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.425 INCHES NOMINAL IN. 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.