The Ring,retaining, cataloged under National Stock Number 5325-01-157-3665, 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 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5325-01-157-3665 |
| Primary Part Number | 9M187C156 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Usage Design | EXTERNAL |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Strength Rating | ERR-060 |
| Material Document and Classification | FED STD 66, COMP 302 FED STD 1ST MATERIAL RESPONSE AND MIL-S-5059, TYPE 302 MIL SPEC 2ND MATERIAL RESPONSE AND AMS 5519 ASSN STD 3RD MATERIAL RESPONSE AND QQ-S-766, CLASS 302 FED SPEC 4TH MATERIAL RESPONSE |
| Cross-Sectional Shape Style | DOUBLE OVAL |
| Outside Diameter | 1.672 INCHES MINIMUM AND 1.692 INCHES MAXIMUM IN |
| Major Thickness | 0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Inside Diameter | 1.456 INCHES MINIMUM AND 1.476 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | SPIRAL |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 302 OR STEEL COMP 301 |
| 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 |
|---|---|
| 9M187C156 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 9M187C156 | 5/2 Secondary reference U.S. Government activity |
| RST-156-SP-M9 | 5/2 Secondary reference U.S. Government activity |
NSN 5325-01-157-3665 is a Ring,retaining, manufactured by The Boeing Company Div Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-157-3665 has 1 manufacturer part number on file: 9M187C156 (The Boeing Company Div Defense).
Key specifications for 9M187C156: Usage Design: EXTERNAL; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE; Strength Rating: ERR-060; Material Document and Classification: FED STD 66, COMP 302 FED STD 1ST MATERIAL RESPONSE AND MIL-S-5059, TYPE 302 MIL SPEC 2ND MATERIAL RESPONSE AND AMS 5519 ASSN STD 3RD MATERIAL RESPONSE AND QQ-S-766, CLASS 302 FED SPEC 4TH MATERIAL RESPONSE. 12 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.