The Ring,piston, cataloged under National Stock Number 4310-01-188-3368, 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 4 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-01-188-3368 |
| Primary Part Number | H18-539 |
| Item Name | Ring,piston |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Dresser Industries Inc Leroi Div |
| Status | ACTIVE |
| Radial Wall Thickness | 0.1230 INCHES NOMINAL IN |
| Ring Style | CONCENTRIC |
| Standard Bore Diameter | 4.750 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 |
|---|---|
| H18-539 PRIMARY | Dresser Industries Inc Leroi Div (USA) |
NSN 4310-01-188-3368 is a Ring,piston, manufactured by Dresser Industries Inc Leroi Div, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-01-188-3368 has 1 manufacturer part number on file: H18-539 (Dresser Industries Inc Leroi Div).
1 possible match (shared part number, not a government interchangeability claim): 6750-01-427-8884. Verify interchangeability with system specifications before substitution.
Key specifications for H18-539: Radial Wall Thickness: 0.1230 INCHES NOMINAL IN; Ring Style: CONCENTRIC; Standard Bore Diameter: 4.750 INCHES IN; End Item Identification: LER0I DIV DRESSER INDUSTRIES INC MODEL 5000 AIR COMPRESSOR. 4 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.