The Piston,valve,shutoff, cataloged under National Stock Number 2995-01-171-7778, is classified within Federal Supply Class 2995 (Miscellaneous Engine Accessories, Aircraft) of the Engine Accessories group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2995-01-171-7778 |
| Item Name | Piston,valve,shutoff |
| FSC / FSG | 2995 / 29 — Miscellaneous Engine Accessories, Aircraft |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY AMS4117,ANODIZED PER MIL-A-8625 TYPE 1,CLASS 1,HARDCOAT PER MIL-A-8625 TYPE 3,CLASS 1 O-RING FLANGES,SHAPE FLANGED TUBE,DIM.,1.830 IN. MIN,1.840 IN. MAX O/A LG,0.665 IN.MIN,0.685 IN. MAX RIGHT FLANGE OD,0.060 IN. MIN,0.061 IN. MAX RIGHT FLANGE THK,0.4780 IN. MIN,0.4790 IN. MAX LEFT END AND CENTER FLANGE OD,0.055 IN. MIN,0.060 IN. MAX FLANGE THK,0.300 IN. MIN,0.320 IN. MAX BODY OD,0.130 IN. MIN,0.150 IN. MAX BODY ID IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 4068T39P02 | 5/2 Secondary reference U.S. Government activity |
| 4068T39P02 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2995-01-171-7778 is a Piston,valve,shutoff, classified under FSC 2995, Miscellaneous Engine Accessories, Aircraft. Status: active.
Key specifications for 2995-01-171-7778: General Characteristics Item Description: ALUMINUM ALLOY AMS4117,ANODIZED PER MIL-A-8625 TYPE 1,CLASS 1,HARDCOAT PER MIL-A-8625 TYPE 3,CLASS 1 O-RING FLANGES,SHAPE FLANGED TUBE,DIM.,1.830 IN. MIN,1.840 IN. MAX O/A LG,0.665 IN.MIN,0.685 IN. MAX RIGHT FLANGE OD,0.060 IN. MIN,0.061 IN. MAX RIGHT FLANGE THK,0.4780 IN. MIN,0.4790 IN. MAX LEFT END AND CENTER FLANGE OD,0.055 IN. MIN,0.060 IN. MAX FLANGE THK,0.300 IN. MIN,0.320 IN. MAX BODY OD,0.130 IN. MIN,0.150 IN. MAX BODY ID IN. 1 specification is 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.
NSN 2995-01-171-7778 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.