The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-01-212-4533, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 25 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-212-4533 |
| Primary Part Number | 2012A41 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| Fastener Length | 2.522 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE SIDES OF HEAD |
| Surface Treatment Document and Classification | MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD |
| Surface Treatment Document and Classification | QQ-C-320,TY1,CL1 MIL SPEC SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD |
| Surface Treatment Document and Classification | QQ-C-320,TY1,CL1 MIL SPEC SINGLE TREATMENT RESPONSE GRIP |
| Concentric Hole Depth | 1.592 INCHES NOMINAL IN |
| Thread Length | 0.640 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN |
| Style Designator | CONCENTRIC HOLE UNTHREADED |
| Material Document and Classification | MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Shoulder Diameter | 0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Concentric Hole Diameter | 0.310 INCHES NOMINAL IN |
| Surface Treatment | PLASTIC SIDES OF HEAD |
| Surface Treatment | PLASTIC TOP OF HEAD |
| Surface Treatment | NICKEL AND CHROMIUM BEARING SURFACE OF HEAD |
| Surface Treatment | NICKEL AND CHROMIUM GRIP |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4130 OR STEEL COMP 4140 OVERALL |
| Shoulder Length | 1.802 INCHES MINIMUM AND 1.812 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.292 INCHES NOMINAL FIRST HOLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5306-01-212-4533 is a Bolt,internally Relieved Body, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-212-4533 has 2 manufacturer part numbers on file: 2012A41 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us), 2012A41 (Goodrich Corporation).
Key specifications for 2012A41: Fastener Length: 2.522 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE SIDES OF HEAD; Surface Treatment Document and Classification: MIL-C-83286 MIL SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD; Surface Treatment Document and Classification: QQ-C-320,TY1,CL1 MIL SPEC SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD. 25 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.