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68-687 ✓ Verified by PartsTable
3M · 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 CHECK,PISTON ROD is a 3M industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOAT, current_type: DC, terminal_type: STUD, overall_length: 72.750 INCHES NOMINAL IN, voltage_rating: 10.0 VOLTS MINIMUM AND 12.0 VOLTS MAXIMUM, mounting_method: BRACKET(S). This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-292-4332, 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
68-687
NSN: 5330-00-292-4332
FSC: 5330
CAGE: 09386 — ALLIEDSIGNAL INC ALLIEDSIGNAL BRAKING SYSTEMS-WHEEL END PRODUCTS (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOAT
current_typeDC
terminal_typeSTUD
overall_length72.750 INCHES NOMINAL IN
voltage_rating10.0 VOLTS MINIMUM AND 12.0 VOLTS MAXIMUM
mounting_methodBRACKET(S)
pressure_rating0.000 POUNDS PER SQUARE INCH (PSI) MINIMUM AND 400.000 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
actuation_methodFLOAT
terminal_quantity4
resistance_in_ohms5.100 PER INCH OF INDICATION
float_effective_travel63.750 INCHES NOMINAL IN
end_item_identification3655-00-288-0309
NSN5330-00-292-4332
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 68-687 MFR: 3M ⚠ 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 SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
STYLE DESIGNATOR: CIRCULAR
•
HOLE DIAMETER: 0.469 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
OUTSIDE DIAMETER: 4.656 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-G-12803,NO. +3002-A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.016 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 6
•
BOLT CIRCLE DIAMETER: 4.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
STYLE DESIGNATORCIRCULAR
HOLE DIAMETER0.469 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
OUTSIDE DIAMETER4.656 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-G-12803,NO. +3002-A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL THICKNESS0.016 INCHES NOMINAL IN
BOLT HOLE QUANTITY6
BOLT CIRCLE DIAMETER4.000 INCHES NOMINAL IN
MATERIALPAPER OVERALL
APERTURE DIAMETER3.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
69-530Interchangeable
interchangeable cross-reference
interchangeable
30554-69-530Interchangeable
interchangeable cross-reference
interchangeable
10580Interchangeable
interchangeable cross-reference
interchangeable
GB105-80Interchangeable
interchangeable cross-reference
interchangeable
110S 31/64Interchangeable
interchangeable cross-reference
interchangeable
10208Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 68-687?
68-687 is a CHECK,PISTON ROD manufactured by 3M.
What parts can replace 68-687?
There are 19 known substitutes for 68-687: 69-530, 30554-69-530, 10580 and 16 more. Substitute compatibility should be verified for your specific system.
Is 68-687 still available?
68-687 is currently cancelled.
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Last verified: July 2026