The Insulation Pipe Fitting Covering, cataloged under National Stock Number 5640-01-612-1663, is classified within Federal Supply Class 5640 (Wallboard, Building Paper, and Thermal Insulation Materials) of the Construction and Building Materials group. The manufacturer of record is Armacell Llc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5640-01-612-1663 |
| Primary Part Number | BST41812 |
| Item Name | Insulation Pipe Fitting Covering |
| FSC / FSG | 5640 / 56 — Wallboard, Building Paper, and Thermal Insulation Materials |
| Manufacturer | Armacell Llc |
| Status | ACTIVE |
| Material Density | 3.0 POUNDS PER CUBIC FOOT MINIMUM AND 6.0 POUNDS PER CUBIC FOOT MAXIMUM LBS |
| Nominal Fitting Size Accommodated | 4.125 INCHES IN |
| Insulation Thickness | 0.500 INCHES NOMINAL IN |
| Layer Quantity | 1 |
| Temp Rating | -295.0 FAHRENHEIT MINIMUM AND 180.0 FAHRENHEIT MAXIMUM DEGF |
| Material | RUBBER SYNTHETIC LOCATION NOT OTHERWISE SPECIFIED |
| Fabrication Method | MOLDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 5640-01-612-1663 is a Insulation Pipe Fitting Covering, manufactured by Armacell Llc, classified under FSC 5640, Wallboard, Building Paper, and Thermal Insulation Materials. Status: active.
NSN 5640-01-612-1663 has 2 manufacturer part numbers on file: 44745K46 (Mcmaster-Carr Supply Co), BST41812 (Armacell Llc).
Key specifications for BST41812: Material Density: 3.0 POUNDS PER CUBIC FOOT MINIMUM AND 6.0 POUNDS PER CUBIC FOOT MAXIMUM LBS; Nominal Fitting Size Accommodated: 4.125 INCHES IN; Insulation Thickness: 0.500 INCHES NOMINAL IN; Layer Quantity: 1. 7 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.