The Ring,retaining, cataloged under National Stock Number 5325-01-042-9841, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-042-9841 |
| Primary Part Number | 9M187-156 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Usage Design | EXTERNAL |
| Strength Rating | ERR-060 |
| Material Document and Classification | SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE |
| Cross-Sectional Shape Style | DOUBLE OVAL |
| Outside Diameter | 1.692 INCHES NOMINAL IN |
| Major Thickness | 0.064 INCHES NOMINAL IN |
| Inside Diameter | 1.456 INCHES MINIMUM AND 1.476 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | SPIRAL |
| Surface Treatment | CADMIUM AND CHROMATE |
| Material | STEEL |
| 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 |
|---|---|
| 9M187-156 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| RST156C | 5/2 Secondary reference U.S. Government activity |
NSN 5325-01-042-9841 is a Ring,retaining, manufactured by The Boeing Company Div Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-042-9841 has 1 manufacturer part number on file: 9M187-156 (The Boeing Company Div Defense).
Key specifications for 9M187-156: Usage Design: EXTERNAL; Strength Rating: ERR-060; Material Document and Classification: SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE; Cross-Sectional Shape Style: DOUBLE OVAL. 11 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.