The Compass,magnetic,mounted, cataloged under National Stock Number 6605-01-616-4268, 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 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6605-01-616-4268 |
| Primary Part Number | TR-31G |
| Item Name | Compass,magnetic,mounted |
| FSC / FSG | 6605 / 66 — Navigational Instruments |
| Manufacturer | Ritchie E S and Sons Inc |
| Status | ACTIVE |
| Design Type | TOP READING |
| Overall Diameter | 3.000 INCHES NOMINAL IN |
| Mounting Method | BRACKET(S) |
| Supplementary Features | BUILT-IN 12-VOLT GREEN NITE VU LIGHTING |
| Reference Data and Literature | TM 55-1905-223-10 |
| Illuminated Feature | INCLUDED |
| Compensator Type | QUADRANTAL CYLINDERS |
| Compensating Feature | INCLUDED |
| Card Size | 2.250 INCHES IN |
| Fluid Type | ANY ACCEPTABLE |
| Bowl Shape | SPHERICAL |
| Heeling Correctors | NOT PROVIDED |
| Instrument Type | WET |
| Bowl Element Type | CARD |
| Dial Size | 2.250 INCHES IN |
| Smallest Increment in Deg | 5.000 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 |
|---|---|
| TR-31G PRIMARY | Ritchie E S and Sons Inc (USA) |
| Reference | Meaning |
|---|---|
| N299L74 | 5/9 Secondary reference U.S. Government activity |
NSN 6605-01-616-4268 is a Compass,magnetic,mounted, manufactured by Ritchie E S and Sons Inc, classified under FSC 6605, Navigational Instruments. Status: active.
NSN 6605-01-616-4268 has 1 manufacturer part number on file: TR-31G (Ritchie E S and Sons Inc).
Key specifications for TR-31G: Overall Height: 2.875 INCHES NOMINAL IN; Design Type: TOP READING; Overall Diameter: 3.000 INCHES NOMINAL IN; Mounting Method: BRACKET(S). 16 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.