The Bolt,machine, cataloged under National Stock Number 5306-01-553-4203, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Phillips Research Corp Dba Sea Systems Division Div Sea Systems Division of Phillips Research Corp.. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-553-4203 |
| Primary Part Number | 505001-000 ITEM 21 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Phillips Research Corp Dba Sea Systems Division Div Sea Systems Division of Phillips Research Corp. |
| Status | ACTIVE |
| Fastener Length | 0.875 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 505001-000 ITEM 21 PRIMARY | Phillips Research Corp Dba Sea Systems Division Div Sea Systems Division of Phillips Research Corp. (USA) |
| 0.312-18UNC-2AX0.875 NICU | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 505001-000 ITEM 21 | 5/9 Secondary reference Phillips Research Corp |
NSN 5306-01-553-4203 is a Bolt,machine, manufactured by Phillips Research Corp Dba Sea Systems Division Div Sea Systems Division of Phillips Research Corp., classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-553-4203 has 2 manufacturer part numbers on file: 505001-000 ITEM 21 (Phillips Research Corp Dba Sea Systems Division Div Sea Systems Division of Phillips Research Corp.), 0.312-18UNC-2AX0.875 NICU (Naval Inventory Control Point Mechanicsburg).
Key specifications for 505001-000 ITEM 21: Fastener Length: 0.875 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES IN; Thread Direction: RIGHT-HAND; Special Features: LOCKING FEATURE MATERIAL, PLASTIC ACRYLIC. 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.