The Ring,piston, cataloged under National Stock Number 4310-01-261-6218, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Mersen Usa Ptt Corp Dba Mersen Usa - Salem Branch Div Mersen Usa Bn Corp. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4310-01-261-6218 |
| Primary Part Number | M2-SA28 |
| Item Name | Ring,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Mersen Usa Ptt Corp Dba Mersen Usa - Salem Branch Div Mersen Usa Bn Corp |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT HYDRAULIC SYSTEM |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | VERTICAL JOINT |
| Radial Wall Thickness | 0.6700 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 1.211 INCHES IN |
| Material | GRAPHITE OVERALL |
| 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 |
|---|---|
| M2-SA28 PRIMARY | Mersen Usa Ptt Corp Dba Mersen Usa - Salem Branch Div Mersen Usa Bn Corp (USA) |
| Reference | Meaning |
|---|---|
| M2-SA2B | 5/9 Secondary reference Mersen Usa Ptt Corp Dba Mersen Usa - Salem Branch Div Mersen Usa Bn Corp |
| 27080-26 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4310-01-261-6218 is a Ring,piston, manufactured by Mersen Usa Ptt Corp Dba Mersen Usa - Salem Branch Div Mersen Usa Bn Corp, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-01-261-6218 has 1 manufacturer part number on file: M2-SA28 (Mersen Usa Ptt Corp Dba Mersen Usa - Salem Branch Div Mersen Usa Bn Corp).
Key specifications for M2-SA28: FSC Application Data: AIRCRAFT HYDRAULIC SYSTEM; Overall Width: 0.0890 INCHES MINIMUM AND 0.0990 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: VERTICAL JOINT. 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.