The Ring Set,piston, cataloged under National Stock Number 4310-00-005-7628, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Dresser Industries Inc Leroi Div. Government technical data includes 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4310-00-005-7628 |
| Primary Part Number | H204-388 |
| Item Name | Ring Set,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Dresser Industries Inc Leroi Div |
| Status | ACTIVE |
| Ring Set Component Parts | COMPRESSION RING,H18-496,35301,2,EXPANDER RING,H18-498,35301,1; OIL RING,H18-491,35301,1 |
| Piston Accommodation Quantity | 1 |
| Standard Bore Diameter | 4.500 INCHES IN |
| 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 |
|---|---|
| H204-388 PRIMARY | Dresser Industries Inc Leroi Div (USA) |
| Reference | Meaning |
|---|---|
| H18-496--G AND H18-497 | 5/9 Secondary reference Dresser Industries Inc Leroi Div |
| H18-498-H | 5/9 Secondary reference Dresser Industries Inc Leroi Div |
NSN 4310-00-005-7628 is a Ring Set,piston, manufactured by Dresser Industries Inc Leroi Div, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-00-005-7628 has 1 manufacturer part number on file: H204-388 (Dresser Industries Inc Leroi Div).
Key specifications for H204-388: Ring Set Component Parts: COMPRESSION RING,H18-496,35301,2,EXPANDER RING,H18-498,35301,1; OIL RING,H18-491,35301,1; Piston Accommodation Quantity: 1; Standard Bore Diameter: 4.500 INCHES IN. 3 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.