The Bolt,internal Wrenching, cataloged under National Stock Number 5306-01-056-6522, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-056-6522 |
| Primary Part Number | CA21037-4-4HS |
| Item Name | Bolt,internal Wrenching |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Width Across Flats | 0.140 INCHES NOMINAL IN |
| Fastener Length | 1.017 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.520 INCHES NOMINAL IN |
| Material Document and Classification | MIL-5626 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 4140 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| CA21037-4-4HS PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| CA21037-4-4HS | Monadnock Company, the Dba Lisi Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 5306PL1635667 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| CA21037-4-4HS | 5/2 Secondary reference U.S. Government activity |
| 120000-4-4 | 5/9 Secondary reference Monadnock Company, the Dba Lisi Aerospace |
| 5306PL0894743 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| C9537-4-4 | 7/2 Vendor item drawing reference U.S. Government activity |
| 5306PL1635673 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5306-01-056-6522 is a Bolt,internal Wrenching, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-056-6522 has 2 manufacturer part numbers on file: CA21037-4-4HS (Howmet Global Fastening Systems Inc. Div Tridair Products), CA21037-4-4HS (Monadnock Company, the Dba Lisi Aerospace).
Key specifications for CA21037-4-4HS: Width Across Flats: 0.140 INCHES NOMINAL IN; Fastener Length: 1.017 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.520 INCHES NOMINAL IN. 14 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.