The Screw,close Tolerance, cataloged under National Stock Number 5305-01-167-2406, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 19 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-167-2406 |
| Primary Part Number | ST3M430V5-21AS |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.0878 INCHES MINIMUM AND 0.0899 INCHES MAXIMUM IN |
| Fastener Length | 1.827 INCHES MINIMUM AND 1.874 INCHES MAXIMUM IN |
| Thread Length | 0.505 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | TITANIUM ALLOY UNS R54520 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.602 INCHES MINIMUM AND 0.634 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 |
|---|---|
| ST3M430V5-21AS | Hi-Shear Corporation (USA) |
| ST3M430V5-21AS | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M430V5-21AS | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| ST3M430V5-21AS | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M430V5-21AS PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| BM33024V5-21U | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT8137-5-21AS | 5/9 Secondary reference U.S. Government activity |
| HT271A5-21 | 5/9 Secondary reference Hi-Shear Corporation |
| 110179-5-21AS | 5/9 Secondary reference U.S. Government activity |
| HT8137-5-21AS | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M430V5-21AS | 5/2 Secondary reference U.S. Government activity |
| 110179-5-21AS | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BM33024V5-21U | 5/9 Secondary reference U.S. Government activity |
| 10115509 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-167-2406 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-167-2406 has 5 manufacturer part numbers on file: ST3M430V5-21AS (Hi-Shear Corporation), ST3M430V5-21AS (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M430V5-21AS (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), ST3M430V5-21AS (Sps Technologies, Llc Dba PB Fasteners), ST3M430V5-21AS (The Boeing Company Div Defense).
Key specifications for ST3M430V5-21AS: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.0878 INCHES MINIMUM AND 0.0899 INCHES MAXIMUM IN; Fastener Length: 1.827 INCHES MINIMUM AND 1.874 INCHES MAXIMUM IN. 19 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.