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B51D — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

B51D: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC LENS, flange_width: 0.250 INCHES NOMINAL IN, overall_height: 1.250 INCHES NOMINAL IN, mounting_method: SNAP RING, overall_diameter: 3.125 INCHES NOMINAL IN, style_designator: CONVEX. This part is cataloged in the U.S.

Government catalog under NSN 6220-00-897-5856, 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
B51D
NSN: 6220-00-897-5856
FSC: 6220 — Electric Vehicular Lights and Fixtures
CAGE: 13226 — BETTS INDUSTRIES, INC. (USA)
SPECIFICATIONS
materialPLASTIC LENS
flange_width0.250 INCHES NOMINAL IN
overall_height1.250 INCHES NOMINAL IN
mounting_methodSNAP RING
overall_diameter3.125 INCHES NOMINAL IN
style_designatorCONVEX
surface_conditionSMOOTH FACE
effective_diameter2.375 INCHES NOMINAL IN
end_item_identificationSEMITRAILER,TANK
mounting_device_quantity1
light_transmission_designTRANSLUCENT LENS
NSN6220-00-897-5856
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAP,PROTECTIVE,DUST AND MOISTURE TITLE COMPONENT PN B51D MFR CAP,PROTECTIVE,DUST AN
KEY FEATURES
•
EFFECTIVE DIAMETER: 2.375 INCHES NOMINAL IN
•
OVERALL DIAMETER: 3.125 INCHES NOMINAL IN
•
MOUNTING METHOD: SNAP RING
•
STYLE DESIGNATOR: CONVEX
•
SURFACE CONDITION: SMOOTH FACE
•
MOUNTING DEVICE QUANTITY: 1
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.250 INCHES NOMINAL IN
EFFECTIVE DIAMETER2.375 INCHES NOMINAL IN
OVERALL DIAMETER3.125 INCHES NOMINAL IN
MOUNTING METHODSNAP RING
STYLE DESIGNATORCONVEX
SURFACE CONDITIONSMOOTH FACE
SURFACE CONDITIONRIBBED BACK
MOUNTING DEVICE QUANTITY1
COLORAMBER LENS
LIGHT TRANSMISSION DESIGNTRANSLUCENT LENS
SUBSTITUTES & CROSS-REFERENCES 5
102881-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
51-132Reference document
Same NSN cross-reference
Reference document — Secondary reference
51-131Reference document
Same NSN cross-reference
Reference document — Secondary reference
51AReference document
Same NSN cross-reference
Reference document — Secondary reference
9265Reference document
Same NSN cross-reference
Reference document — Secondary 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 B51D?
B51D is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace B51D?
There are 5 known substitutes for B51D: 102881-1, 51-132, 51-131 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B51D?
B51D is cataloged in the U.S. Government catalog under NSN 6220-00-897-5856. 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.