The Compass,magnetic,mounted, cataloged under National Stock Number 6605-01-554-2638, is classified within Federal Supply Class 6605 (Navigational Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Ritchie E S and Sons Inc. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6605-01-554-2638 |
| Primary Part Number | B81-24V |
| Item Name | Compass,magnetic,mounted |
| FSC / FSG | 6605 / 66 — Navigational Instruments |
| Manufacturer | Ritchie E S and Sons Inc |
| Status | ACTIVE |
| Design Type | TOP READING |
| Illuminated Feature | INCLUDED |
| Compensating Feature | INCLUDED |
| Bowl Shape | SPHERICAL |
| Heeling Correctors | NOT PROVIDED |
| Instrument Type | DRY |
| Bowl Element Type | NEEDLE |
| Dial Size | 3.000 INCHES IN |
| Smallest Increment in Deg | 5.0 DIAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| B81-24V PRIMARY | Ritchie E S and Sons Inc (USA) |
NSN 6605-01-554-2638 is a Compass,magnetic,mounted, manufactured by Ritchie E S and Sons Inc, classified under FSC 6605, Navigational Instruments. Status: active.
NSN 6605-01-554-2638 has 1 manufacturer part number on file: B81-24V (Ritchie E S and Sons Inc).
Key specifications for B81-24V: Design Type: TOP READING; Illuminated Feature: INCLUDED; Compensating Feature: INCLUDED; Special Features: ADJUSTABLE AND REMOVABLE WITH BRACKET AND THUMBSCREWS; MOVEABLE SUN SHIELD; BUILT IN GREEN NITEVU NIGHT ILLUMINATION; HIGH TEMPERATURE COMPOSITE CONSTRUCTION FOR EXTENDED OPERATING RANGE; SCIENTIFICALLY MATCHED SAPPHIRE JEWEL AND HARDENED STEEL PIVOT DIAL. 9 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.