The Indicator,angle, cataloged under National Stock Number 6320-01-332-1977, is classified within Federal Supply Class 6320 (Shipboard Alarm and Signal Systems) of the Alarm, Signal, and Security Detection Systems group. The manufacturer of record is Dynalec Corporation. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6320-01-332-1977 |
| Primary Part Number | 4N91N |
| Item Name | Indicator,angle |
| FSC / FSG | 6320 / 63 — Shipboard Alarm and Signal Systems |
| Manufacturer | Dynalec Corporation |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Mounting Arrangement Style | FOUR HOLE/STUD RECTANGULAR/SQUARE |
| Scale Marking | NUMERALS |
| Length | 11.000 INCHES NOMINAL IN |
| AC Voltage Rating | 115.0 VOLTS NOMINAL |
| Current Type | AC |
| Usage Design | RUDDER ANGLE |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 10.375 INCHES NOMINAL IN |
| Scale Range | +0.0 TO 45.0 DEGREES FIRST INDICATOR SINGLE SCALE |
| Scale Range | +0.0 TO 45.0 DEGREES SECOND INDICATOR SINGLE SCALE |
| Mounting Hole Diameter | 0.257 INCHES NOMINAL IN |
| Scale Marking Transparency | NONLUMINOUS |
| Dial Outside Diameter | 6.000 INCHES NOMINAL IN |
| Presentation Type | DIAL |
| Height | 7.120 INCHES NOMINAL IN |
| Frequency Rating | 60.0 HERTZ MINIMUM AND 400.0 HERTZ MAXIMUM |
| Width | 9.000 INCHES NOMINAL IN |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 6.000 INCHES NOMINAL IN |
| Material | ALUMINUM CASE |
| 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 |
|---|---|
| 4N91N PRIMARY | Dynalec Corporation (USA) |
| Reference | Meaning |
|---|---|
| MB4225-1 | 5/9 Secondary reference The Electric Tachometer Corp. |
| 4N91N | 5/9 Secondary reference The Electric Tachometer Corp. |
NSN 6320-01-332-1977 is a Indicator,angle, manufactured by Dynalec Corporation, classified under FSC 6320, Shipboard Alarm and Signal Systems. Status: active.
NSN 6320-01-332-1977 has 1 manufacturer part number on file: 4N91N (Dynalec Corporation).
Key specifications for 4N91N: Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Mounting Arrangement Style: FOUR HOLE/STUD RECTANGULAR/SQUARE; Scale Marking: NUMERALS; Length: 11.000 INCHES NOMINAL IN. 19 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.
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.