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Technical Data Sheet
B251 ✓ 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

The BULB,FLUSH,WATER CLOSET TANK is a the manufacturer industrial component. Key specifications include color: BLUE, COLOR ASSN OF THE US, 65014 OVERALL, diameter: 2.750 INCHES NOMINAL IN, material: RUBBER CHLOROPRENE CLASS CR, user_designator: ENLISTED MAN AND ENLISTED WOMAN, overall_diameter: 1.250 INCHES NOMINAL IN, special_features: WORN W/INSIGNIA,BRANCH OF SERVICE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-392-0800, 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
B251
NSN: 5331-00-392-0800
FSC: 5331 — O-RING
CAGE: 98991 — WORCESTER CONTROLS CORP P O BOX 2609 COOKEVILLE TN 385022609 (USA)
SPECIFICATIONS
colorBLUE, COLOR ASSN OF THE US, 65014 OVERALL
diameter2.750 INCHES NOMINAL IN
materialRUBBER CHLOROPRENE CLASS CR
user_designatorENLISTED MAN AND ENLISTED WOMAN
overall_diameter1.250 INCHES NOMINAL IN
special_featuresWORN W/INSIGNIA,BRANCH OF SERVICE
design_designationINFANTRY
center_hole_diameter0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN
cross-sectional_height0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
department_designationUS ARMY
procurement_group_code13813
nondefinitive_spec/std_dataII TYPE
NSN5331-00-392-0800
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B251 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: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CENTER HOLE DIAMETER: 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CENTER HOLE DIAMETER0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
211020Interchangeable
interchangeable cross-reference
interchangeable
B-2-51Interchangeable
interchangeable cross-reference
interchangeable
MIL-B-43049Interchangeable
interchangeable cross-reference
interchangeable
086454Interchangeable
interchangeable cross-reference
interchangeable
8645Interchangeable
interchangeable cross-reference
interchangeable
7488850699Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B251?
B251 is a BULB,FLUSH,WATER CLOSET TANK.
What parts can replace B251?
There are 9 known substitutes for B251: 211020, B-2-51, MIL-B-43049 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B251?
B251 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-392-0800. This indicates validated use in U.S. government and defense supply chains.
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