PartsTable
Technical Data Sheet
M681 ✓ Verified by PartsTable
· TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

CYLINDER ASSEMBLY,HYDRAULIC BRAK. Key specifications include focusing_type: ADJUSTABLE, magnification: 7.0 MINIMUM AND 35.0 MAXIMUM, special_features: FOCAL PLANE FIRST; MOUNTING LENGTH 6.6 INCHES; FIELD OF VIEW AT 100 YARDS 7 TIMES 15.0 FEET; IN, optical_device_type: LENS, objective_aperture_diameter: 34.0 MILLIMETERS NOMINAL MM, straight_type_overall_length: 16.1 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-227-3874, 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
M681
NSN: 3110-00-227-3874
FSC: 3110
CAGE: 60380 — TIMKEN AEROSPACE, INC DBA TORRINGTON PRODUCT (USA)
SPECIFICATIONS
focusing_typeADJUSTABLE
magnification7.0 MINIMUM AND 35.0 MAXIMUM
special_featuresFOCAL PLANE FIRST; MOUNTING LENGTH 6.6 INCHES; FIELD OF VIEW AT 100 YARDS 7 TIMES 15.0 FEET; IN
optical_device_typeLENS
objective_aperture_diameter34.0 MILLIMETERS NOMINAL MM
straight_type_overall_length16.1 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyLAND159-M681 7-35X56F1
NSN3110-00-227-3874
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: M681 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
SURFACE FINISH: GROUND
STYLE DESIGNATOR: NON-SEPARABLE, CLOSED END, DRAWN SHELL
ALIGNMENT TYPE: RIGID
OVERALL OUTSIDE DIAMETER: 0.5625 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATION: AFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
MATERIAL: STEEL OVERALL
RETAINER FABRICATION METHOD: PRESSED
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESEXTRA CAPACITY OUTER RING
SURFACE FINISHGROUND
STYLE DESIGNATORNON-SEPARABLE, CLOSED END, DRAWN SHELL
ALIGNMENT TYPERIGID
OVERALL OUTSIDE DIAMETER0.5625 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
MATERIALSTEEL OVERALL
RETAINER FABRICATION METHODPRESSED
OVERALL WIDTH0.5000 INCHES NOMINAL IN
BORE DIAMETER0.3750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
49103HXInterchangeable
interchangeable cross-reference
interchangeable
C21999Interchangeable
interchangeable cross-reference
interchangeable
F681Interchangeable
interchangeable cross-reference
interchangeable
M681Interchangeable
interchangeable cross-reference
interchangeable
2557114Interchangeable
Same NIIN cross-reference
interchangeable
171B617P1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M681?
M681 is a CYLINDER ASSEMBLY,HYDRAULIC BRAK.
What parts can replace M681?
There are 7 known substitutes for M681: 49103HX, C21999, F681 and 4 more. Substitute compatibility should be verified for your specific system.
Is M681 still available?
M681 is currently cancelled.
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