The Ring,piston, cataloged under National Stock Number 4310-00-974-7355, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4310-00-974-7355 |
| Primary Part Number | M1904P |
| Item Name | Ring,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| Cross-Sectional Shape Style | PLAIN RECTANGULAR, STRAIGHT FACE |
| Joint Style | INTERLOCKING JOINT |
| Radial Wall Thickness | 0.0900 INCHES MINIMUM AND 0.1000 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Surface Treatment | TIN OVERALL |
| Standard Bore Diameter | 1.935 INCHES IN |
| Material | IRON 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 |
|---|---|
| 336290R1 | Dressta North America Ltd (USA) |
| 336290R1 | Komatsu America Corp. (USA) |
| M1904P PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| M1904P | Marine & Industrial Transmissions Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 336290R1 | 5/9 Secondary reference U.S. Government activity |
| 336290R1 | 5/9 Secondary reference Komatsu American Intl Co |
NSN 4310-00-974-7355 is a Ring,piston, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-974-7355 has 4 manufacturer part numbers on file: 336290R1 (Dressta North America Ltd), 336290R1 (Komatsu America Corp.), M1904P (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), M1904P (Marine & Industrial Transmissions Ltd).
Key specifications for M1904P: Overall Width: 0.0925 INCHES MINIMUM AND 0.0935 INCHES MAXIMUM IN; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Joint Style: INTERLOCKING JOINT; Radial Wall Thickness: 0.0900 INCHES MINIMUM AND 0.1000 INCHES MAXIMUM IN. 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.