The Ring,retaining, cataloged under National Stock Number 5325-01-147-2491, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-147-2491 |
| Primary Part Number | 9M187-275 |
| 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-416, TYPE 2, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE |
| Strength Rating | ERR-060 |
| Material Document and Classification | AISI 1020 ASSN STD 1ST MATERIAL RESPONSE OR SAE 1020 ASSN STD 1ST MATERIAL RESPONSE OR AISI 1025 ASSN STD 2ND MATERIAL RESPONSE OR SAE 1025 ASSN STD 2ND MATERIAL RESPONSE OR AISI 1040 ASSN STD 3RD MATERIAL RESPONSE OR SAE 1040 ASSN STD 3RD MATERIAL RESPONSE OR AISI 1060 ASSN STD 4TH MATERIAL RESPONSE OR SAE 1060 ASSN STD 4TH MATERIAL RESPONSE OR FED STD 66 FED STD ALL MATERIAL RESPONSES OR MIL-S-46049, COMP 1074 OR 1085 MIL SPEC ALL MATERIAL RESPONSES |
| Cross-Sectional Shape Style | DOUBLE OVAL |
| Outside Diameter | 3.080 INCHES NOMINAL IN |
| Major Thickness | 0.090 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN |
| Inside Diameter | 2.574 INCHES MINIMUM AND 2.604 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Ring Style | SPIRAL |
| Surface Treatment | CADMIUM AND CHROMATE |
| Material | STEEL COMP 1020 OR STEEL COMP 1025 OR STEEL COMP 1040 OR STEEL COMP 1060 OR STEEL COMP 1074 OR STEEL COMP 1085 |
| 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 |
|---|---|
| 9M187-275 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| RST275CD-M9 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-147-2491 is a Ring,retaining, manufactured by The Boeing Company Div Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-147-2491 has 1 manufacturer part number on file: 9M187-275 (The Boeing Company Div Defense).
Key specifications for 9M187-275: Usage Design: EXTERNAL; Surface Treatment Document and Classification: QQ-P-416, TYPE 2, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE; Strength Rating: ERR-060; Material Document and Classification: AISI 1020 ASSN STD 1ST MATERIAL RESPONSE OR SAE 1020 ASSN STD 1ST MATERIAL RESPONSE OR AISI 1025 ASSN STD 2ND MATERIAL RESPONSE OR SAE 1025 ASSN STD 2ND MATERIAL RESPONSE OR AISI 1040 ASSN STD 3RD MATERIAL RESPONSE OR SAE 1040 ASSN STD 3RD MATERIAL RESPONSE OR AISI 1060 ASSN STD 4TH MATERIAL RESPONSE OR SAE 1060 ASSN STD 4TH MATERIAL RESPONSE OR FED STD 66 FED STD ALL MATERIAL RESPONSES OR MIL-S-46049, COMP 1074 OR 1085 MIL SPEC ALL MATERIAL RESPONSES. 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.