The Screw,close Tolerance, cataloged under National Stock Number 5305-01-043-1371, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Valley-Todeco, Inc. Dba Arconic Fastening Systems. Government technical data includes 7 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-043-1371 |
| Primary Part Number | GB510FG4-19 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Treatment Document and Classification | NAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837 TY 2 CL 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| Specification/standard Data | 26512-GB510N MANUFACTURERS STANDARD |
| Surface Treatment | CADMIUM OR CADMIUM AND CHROMATE OVERALL |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Material | STEEL COMP H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| GB510FG4-19 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GB510FG4-19 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT326-4A19 PRIMARY | Hi-Shear Corporation (USA) |
| HT326-4A19 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| GB510N4A19 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| HT8181F4-19 | 3/2 Design control — primary reference U.S. Government activity |
| SFH22D4A19 | 3/2 Design control — primary reference U.S. Government activity |
| SFH22D4A19 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| BM19045-4-19 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM19045-4-19 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-043-1371 is a Screw,close Tolerance, manufactured by Valley-Todeco, Inc. Dba Arconic Fastening Systems, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-043-1371 has 4 manufacturer part numbers on file: GB510FG4-19 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), GB510FG4-19 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), HT326-4A19 (Hi-Shear Corporation), HT326-4A19 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-387-2216. Verify interchangeability with system specifications before substitution.
Key specifications for GB510FG4-19: Surface Finish: 32.0 MICROINCHES GRIP; Surface Treatment Document and Classification: NAS 672 ASSN STD 1ST TREATMENT RESPONSE OR MIL-C-8837 TY 2 CL 2 MIL SPEC 2ND TREATMENT RESPONSE OVERALL; Specification/standard Data: 26512-GB510N MANUFACTURERS STANDARD; Surface Treatment: CADMIUM OR CADMIUM AND CHROMATE OVERALL. 7 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.