PartsTable
Technical Data Sheet
3B1688 ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include material: CORK OVERALL, hole_diameter: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 3.500 INCHES NOMINAL IN, aperture_width: 2.750 INCHES NOMINAL IN, overall_length: 4.500 INCHES NOMINAL IN, aperture_length: 3.750 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-641-4105, 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
3B1688
NSN: 5330-00-641-4105
FSC: 5330
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialCORK OVERALL
hole_diameter0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width3.500 INCHES NOMINAL IN
aperture_width2.750 INCHES NOMINAL IN
overall_length4.500 INCHES NOMINAL IN
aperture_length3.750 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
bolt_hole_quantity4
outside_corner_radius0.375 INCHES NOMINAL IN
cross-sectional_thickness0.062 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
inside_corner_inverted_radius0.375 INCHES NOMINAL IN
NSN5330-00-641-4105
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3B1688 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 SHAPE STYLE: SOLID SINGLE OR COMPOSITION
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG LENGTH: 0.625 INCHES NOMINAL IN
INSIDE CORNER INVERTED RADIUS: 0.375 INCHES NOMINAL IN
APERTURE WIDTH: 2.750 INCHES NOMINAL IN
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG WIDTH: 0.375 INCHES NOMINAL IN
BOLT HOLE QUANTITY: 4
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL WIDTH3.500 INCHES NOMINAL IN
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG LENGTH0.625 INCHES NOMINAL IN
INSIDE CORNER INVERTED RADIUS0.375 INCHES NOMINAL IN
APERTURE WIDTH2.750 INCHES NOMINAL IN
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG WIDTH0.375 INCHES NOMINAL IN
OVERALL LENGTH4.500 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
STYLE DESIGNATORNON-CIRCULAR
MATERIALCORK OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
35535Interchangeable
interchangeable cross-reference
interchangeable
H35535Interchangeable
interchangeable cross-reference
interchangeable
SE10E1Interchangeable
interchangeable cross-reference
interchangeable
B107.46Interchangeable
interchangeable cross-reference
interchangeable
A-A-3023Interchangeable
interchangeable cross-reference
interchangeable
4407NInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3B1688?
3B1688 is a GASKET.
What parts can replace 3B1688?
There are 8 known substitutes for 3B1688: 35535, H35535, SE10E1 and 5 more. Substitute compatibility should be verified for your specific system.
Is 3B1688 still available?
3B1688 is currently cancelled.
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