The Guide,piston, cataloged under National Stock Number 2995-00-085-4538, is classified within Federal Supply Class 2995 (Miscellaneous Engine Accessories, Aircraft) of the Engine Accessories group. The manufacturer of record is Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road). Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 2995-00-085-4538 |
| Primary Part Number | 661029 |
| Item Name | Guide,piston |
| FSC / FSG | 2995 / 29 — Miscellaneous Engine Accessories, Aircraft |
| Manufacturer | Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road) |
| Status | ACTIVE |
| FSC Application Data | REGULATOR,DIFFERENTIAL PRESSURE,ACFT ENGINE PNEUMATIC ACCESSORY |
| General Characteristics Item Description | ALUMINUM ALLOY,ANODIZED,1.400 TO 1.420 IN. OD FLANGE,1.0285 IN. ID,2.280 TO 2.300 IN. LG 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 |
| Part Number | Manufacturer |
|---|---|
| 661029 PRIMARY | Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road) (USA) |
| Reference | Meaning |
|---|---|
| 661029 | 5/9 Secondary reference U.S. Government activity |
| 661029 | 5/9 Secondary reference Alliedsignal Inc Dba Allied-Signal Aerospace Co |
NSN 2995-00-085-4538 is a Guide,piston, manufactured by Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road), classified under FSC 2995, Miscellaneous Engine Accessories, Aircraft. Status: active.
NSN 2995-00-085-4538 has 1 manufacturer part number on file: 661029 (Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)).
2 possible matches (shared part number, not a government interchangeability claim): 5340-00-449-3408, 5999-01-104-5684. Verify interchangeability with system specifications before substitution.
Key specifications for 661029: FSC Application Data: REGULATOR,DIFFERENTIAL PRESSURE,ACFT ENGINE PNEUMATIC ACCESSORY; General Characteristics Item Description: ALUMINUM ALLOY,ANODIZED,1.400 TO 1.420 IN. OD FLANGE,1.0285 IN. ID,2.280 TO 2.300 IN. LG IN; End Item Identification: 2995008977308 392122-1-1 REGULATOR. 2 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.
NSN 2995-00-085-4538 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.