The Ring,piston, cataloged under National Stock Number 3040-00-162-2862, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-162-2862 |
| Primary Part Number | M1904AS |
| Item Name | Ring,piston |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| 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 | 0.0570 INCHES MINIMUM AND 0.0670 INCHES MAXIMUM IN |
| Ring Style | CONCENTRIC |
| Surface Treatment | TIN OVERALL |
| Standard Bore Diameter | 1.438 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 |
|---|---|
| M1904AS PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| Reference | Meaning |
|---|---|
| M1904AA TO M1904AZ | D/9 Drawing number reference only Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
NSN 3040-00-162-2862 is a Ring,piston, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-162-2862 has 1 manufacturer part number on file: M1904AS (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
5 possible matches (shared part number, not a government interchangeability claim): 4310-00-276-0015, 4310-00-350-8810, 3040-00-411-9473. Verify interchangeability with system specifications before substitution.
Key specifications for M1904AS: 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: 0.0570 INCHES MINIMUM AND 0.0670 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.