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DC31KB1 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, POLYETHYLENE (PP), design_type: THREADED, thread_class: 2B, overall_diameter: 0.188 INCHES NOMINAL IN, inside_diameter_length: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN, round_cap_outside_surface_condition: RIBBED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-178-7855, 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
DC31KB1
NSN: 5340-01-178-7855
FSC: 5340
CAGE: 99017 — CAPLUGS LLC DBA MOKON DIV CAPLUGS (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
design_typeTHREADED
thread_class2B
overall_diameter0.188 INCHES NOMINAL IN
inside_diameter_length0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator0.3750-28 UNS
NSN5340-01-178-7855
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: DC31KB1 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
•
THREAD CLASS: 2B
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
•
OVERALL DIAMETER: 0.188 INCHES NOMINAL IN
•
DESIGN TYPE: THREADED
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.3750-28 UNS
•
INSIDE DIAMETER LENGTH: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
MATERIALPLASTIC, POLYETHYLENE (PP)
OVERALL DIAMETER0.188 INCHES NOMINAL IN
DESIGN TYPETHREADED
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.3750-28 UNS
INSIDE DIAMETER LENGTH0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
519-111-001-603Interchangeable
interchangeable cross-reference
interchangeable
M34AICInterchangeable
interchangeable cross-reference
interchangeable
166137-501Interchangeable
interchangeable cross-reference
interchangeable
845-1889863 PC176Interchangeable
interchangeable cross-reference
interchangeable
DC-3Interchangeable
interchangeable cross-reference
interchangeable
08843041Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is DC31KB1?
DC31KB1 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace DC31KB1?
There are 7 known substitutes for DC31KB1: 519-111-001-603, M34AIC, 166137-501 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for DC31KB1?
DC31KB1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-178-7855. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026