PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M197HMount,optical Transit Square

Brunson Instrument Company Dba Brunson Instrument Co · NSN 4920-00-091-0407 · FSC 4920 · No Item Name Available
Verified by PartsTable
NSN 4920-00-091-0407 — this item is cataloged by the U.S. Government under National Stock Number 4920-00-091-0407. Primary manufacturer part number: M197H.
Features
  • Mount,optical Transit Square — FSC 4920
  • General Characteristics Item Description: O/A DIM. 4.000 IN. OD,2.500 IN.ID,1.045 IN. H IN
  • 4 verified cross-references
  • Primary manufacturer: Brunson Instrument Company Dba Brunson Instrument Co
Applications
  • Maintenance depot operations
  • Field repair and servicing
  • Vehicle maintenance facilities
General Description

The Mount,optical Transit Square, cataloged under National Stock Number 4920-00-091-0407, is classified within Federal Supply Class 4920 (No Item Name Available) of the Maintenance and Repair Shop Equipment group. The primary manufacturer of record is Brunson Instrument Company Dba Brunson Instrument Co. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4920-00-091-0407
Primary Part NumberM197H
Item NameMount,optical Transit Square
FSC / FSG4920 / 49 — No Item Name Available
ManufacturerBrunson Instrument Company Dba Brunson Instrument Co
StatusACTIVE
General Characteristics Item DescriptionO/A DIM. 4.000 IN. OD,2.500 IN.ID,1.045 IN. H IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
9330-00-124-633224-37 INTERCHANGEABLE
Plastic Strip
Cmc of Georgia, Inc.
5998-00-160-11112437 INTERCHANGEABLE
Circuit Card Assembly
Mission Systems Davenport Inc.
5310-00-282-4778 INTERCHANGEABLE
Nut,plain,hexagon
6670-00-303-7700 INTERCHANGEABLE
Scale,weighing
5355-00-667-638824-37 INTERCHANGEABLE
Knob
Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems
5910-00-683-29888909490 INTERCHANGEABLE
Capacitor,variable,ceramic Diele
Us Army Aviation and Missile Command
4140-00-713-9320243-7 INTERCHANGEABLE
Impeller,fan,axial
Industrial Design Laboratories Inc
5320-00-754-026013X37 INTERCHANGEABLE
Rivet,tubular
Napco International Llc Dba Napco International Inc
5920-00-952-9029 INTERCHANGEABLE
Fuseholder,extractor Post
6145-01-012-43765932 INTERCHANGEABLE
Cable,special Purpose,electrical
Mercury Wire Products, Inc. Dba Mercury Wire Products Inc
Cross-Reference Index
Part NumberManufacturer
2437 Brunson Instrument Company Dba Brunson Instrument Co (USA)
M197H PRIMARY Brunson Instrument Company Dba Brunson Instrument Co (USA)
197 Brunson Instrument Company Dba Brunson Instrument Co (USA)
GP530U1 Northrop Grumman Systems Corporation (USA)
Related Parts
9330-00-124-6332INTERCHANGEABLE
PLASTIC STRIP
24-37
5998-00-160-1111INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
2437
5310-00-282-4778INTERCHANGEABLE
NUT,PLAIN,HEXAGON
6670-00-303-7700INTERCHANGEABLE
SCALE,WEIGHING
5355-00-667-6388INTERCHANGEABLE
KNOB
24-37
5910-00-683-2988INTERCHANGEABLE
CAPACITOR,VARIABLE,CERAMIC DIELE
8909490
4140-00-713-9320INTERCHANGEABLE
IMPELLER,FAN,AXIAL
243-7
5320-00-754-0260INTERCHANGEABLE
RIVET,TUBULAR
13X37
5920-00-952-9029INTERCHANGEABLE
FUSEHOLDER,EXTRACTOR POST
6145-01-012-4376INTERCHANGEABLE
CABLE,SPECIAL PURPOSE,ELECTRICAL
5932
5331-01-017-3245INTERCHANGEABLE
O-RING
4820-01-245-0240INTERCHANGEABLE
VALVE,BALL
048980

Frequently Asked Questions

What is NSN 4920-00-091-0407?

NSN 4920-00-091-0407 is a Mount,optical Transit Square, manufactured by Brunson Instrument Company Dba Brunson Instrument Co, classified under FSC 4920 (No Item Name Available). Status: active.

What are the part numbers for NSN 4920-00-091-0407?

NSN 4920-00-091-0407 has 4 cross-referenced part numbers: 2437 (Brunson Instrument Company Dba Brunson Instrument Co), M197H (Brunson Instrument Company Dba Brunson Instrument Co), 197 (Brunson Instrument Company Dba Brunson Instrument Co), GP530U1 (Northrop Grumman Systems Corporation).

What NSN replaces 4920-00-091-0407?

There are 12 known substitutes for 4920-00-091-0407: 9330-00-124-6332, 5998-00-160-1111, 5310-00-282-4778 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M197H?

Key specifications for M197H: General Characteristics Item Description: O/A DIM. 4.000 IN. OD,2.500 IN.ID,1.045 IN. H IN. 1 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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