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178937 — SWITCH,CODE INDICATING WHEEL

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

178937: SWITCH,CODE INDICATING WHEEL.

The SWITCH,CODE INDICATING WHEEL is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, actuator_type: THUMBWHEEL SINGLE ACTUATOR, overall_width: 1.366 INCHES NOMINAL IN, overall_height: 1.696 INCHES NOMINAL IN, overall_length: 0.500 INCHES NOMINAL IN, mounting_method: BRACKET(S) AND UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-132-0249, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ 178937
NSN: 5331-00-132-0249
NIINs: 001320249, 001340377, 017014718
FSC: 5331 — O-ring
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
actuator_typeTHUMBWHEEL SINGLE ACTUATOR
overall_width1.366 INCHES NOMINAL IN
overall_height1.696 INCHES NOMINAL IN
overall_length0.500 INCHES NOMINAL IN
mounting_methodBRACKET(S) AND UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
style_designatorRECTANGULAR INDICATING
features_providedILLUMINATED
precious_materialGOLD
center_hole_diameter1.165 INCHES MINIMUM AND 1.177 INCHES MAXIMUM IN
cross-sectional_height0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
mounting_facility_patternFOUR POSITION RECTANGULAR SINGLE MOUNTING FACILITY
NSN5331-00-132-0249
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 178937 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 1.165 INCHES MINIMUM AND 1.177 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.165 INCHES MINIMUM AND 1.177 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC
SUBSTITUTES & CROSS-REFERENCES 1
146228Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 178937?
178937 is a SWITCH,CODE INDICATING WHEEL. It is classified as a MRO (MRO_GENERAL).
What parts can replace 178937?
There is 1 known substitute for 178937: 146228. Substitute compatibility should be verified for your specific system.
What is the NSN for 178937?
178937 is cataloged in the U.S. Government catalog under NSN 5331-00-132-0249. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.