The Screw,close Tolerance, cataloged under National Stock Number 5305-00-151-8668, 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 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-151-8668 |
| Primary Part Number | HT260LB3-7 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Fastener Length | 0.861 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN |
| Thread Length | 0.313 INCHES MINIMUM AND 0.363 INCHES MAXIMUM IN |
| Material Document and Classification | NAS621,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 26512-GB510F MANUFACTURERS STANDARD |
| Grip Length | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 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 | 32 |
| Material | TITANIUM ALLOY UNS R54520 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.325 INCHES MINIMUM AND 0.387 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 |
|---|---|
| GB510CH3V7LE | Northrop Grumman Systems Corporation (USA) |
| HT260LB3-7 PRIMARY | Hi-Shear Corporation (USA) |
| HT260LB3-7 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| GB510CH3V7LE | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| HT8100-3-7 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| GB510CH3V7LF | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| GB510CH3V7LE | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| T150-3-7 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM19024-3-7 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT8100-3-7 | 5/9 Secondary reference U.S. Government activity |
| 66584-3-7 | 3/2 Design control — primary reference U.S. Government activity |
| T150-3-7 | 5/9 Secondary reference U.S. Government activity |
| 66584-3-7 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BM19024-3-7 | 5/9 Secondary reference U.S. Government activity |
| GB510F3-7 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5305-00-151-8668 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-151-8668 has 4 manufacturer part numbers on file: GB510CH3V7LE (Northrop Grumman Systems Corporation), HT260LB3-7 (Hi-Shear Corporation), HT260LB3-7 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), GB510CH3V7LE (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 6145-01-520-6022. Verify interchangeability with system specifications before substitution.
Key specifications for HT260LB3-7: Surface Finish: 63.0 MICROINCHES GRIP; Fastener Length: 0.861 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN; Thread Length: 0.313 INCHES MINIMUM AND 0.363 INCHES MAXIMUM IN; Material Document and Classification: NAS621,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V. 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.