The Exhaust Stack Assembly,heater, cataloged under National Stock Number 4520-01-071-4776, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Pioneer Machine & Tool Co, Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-071-4776 |
| Primary Part Number | R-2787 |
| Item Name | Exhaust Stack Assembly,heater |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Pioneer Machine & Tool Co, Inc |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF A FLANGED ELBOW; A SPARK ARRESTOR; RAIN CAP; MATERIAL CRES ASTM A240 TYPE 321-347 OR 348; MATERIAL THICKNESS 0.065 IN.; FLANGE DIA 3.250 IN.; FLANGE THICKNESS 0.105 IN.; 4 0.312 IN. BOLT HOLES EQUALLY SPACED ON 2.750 IN. BOLT CIRCLE; FLANGE ID 1.381 IN. 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 |
|---|---|
| R-2787 | Pioneer Machine & Tool Co, Inc (USA) |
| Reference | Meaning |
|---|---|
| SM-A-775925 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4520-01-071-4776 is a Exhaust Stack Assembly,heater, manufactured by Pioneer Machine & Tool Co, Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-071-4776 has 1 manufacturer part number on file: R-2787 (Pioneer Machine & Tool Co, Inc).
Key specifications for R-2787: General Characteristics Item Description: CONSISTS OF A FLANGED ELBOW; A SPARK ARRESTOR; RAIN CAP; MATERIAL CRES ASTM A240 TYPE 321-347 OR 348; MATERIAL THICKNESS 0.065 IN.; FLANGE DIA 3.250 IN.; FLANGE THICKNESS 0.105 IN.; 4 0.312 IN. BOLT HOLES EQUALLY SPACED ON 2.750 IN. BOLT CIRCLE; FLANGE ID 1.381 IN. 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.
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.