The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-01-312-4948, 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 18 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-312-4948 |
| Primary Part Number | CA21107-6-4HS |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Fastener Length | 1.210 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.780 INCHES MINIMUM AND 0.919 INCHES MAXIMUM IN |
| Style Designator | COUNTERBORE UNTHREADED |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Counterbore Depth | 0.110 INCHES MINIMUM IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Counterbore Diameter | 0.2187 INCHES MINIMUM AND 0.2217 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.263 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 4140 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.505 INCHES MINIMUM AND 0.564 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 |
|---|---|
| CA21107-6-4HS | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| Reference | Meaning |
|---|---|
| TE111-0001-0001 | 3/9 Design control — primary reference The Boeing Company Dba Boeing |
| TE111-0001-0001 | 7/2 Vendor item drawing reference The Boeing Company Div Legacy Am&m |
NSN 5306-01-312-4948 is a Bolt,internally Relieved Body, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-312-4948 has 1 manufacturer part number on file: CA21107-6-4HS (Howmet Global Fastening Systems Inc. Div Tridair Products).
Key specifications for CA21107-6-4HS: Fastener Length: 1.210 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.780 INCHES MINIMUM AND 0.919 INCHES MAXIMUM IN; Style Designator: COUNTERBORE UNTHREADED. 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.