KM13 CRAFT lock nut

Locknut KM13 CRAFT – Round Slotted Bearing Nut with M65x2 Fine Metric Thread

Precision bearing locknut KM13 CRAFT (KM series) is a high-grade mechanical fastening and adjustment component, engineered for the axial securing of rolling bearings on shafts, anchoring adapter sleeves, and locating other rotating machine elements. The locknut features a precision-machined metric fine thread and standard lateral slots symmetrically spaced along its outer circumference, enabling dependable tightening and effortless adjustment of internal axial clearance within bearing assemblies.

Manufactured from high-tensile carbon steel, this nut delivers outstanding durability, resistance to thread stripping, and total reliability in harsh industrial and workshop environments. The slotted perimeter is custom-engineered for configuration with standard hook spanners (pin wrenches), allowing technical operators to apply controlled tightening torques. To establish an ironclad locking interface against vibration-induced loosening under dynamic, reversing stresses, the KM13 nut is designed to be paired with an MB13 multi-tang tab washer. Bending one of the washer's exterior tabs into a slot on the nut mechanically locks the entire assembly into place relative to the shaft.

Applications

• axial mounting and structural retention of single and double-row rolling bearings,
• securing industrial adapter sleeves and withdrawal sleeves on straight shafts,
• heavy industrial gearboxes, speed reducers, planetary drives, and right-angle drives,
• agricultural machinery, tractor implements, large harvesters, and heavy-duty field implements,
• manufacturing machinery, assembly automation lines, and process technological setups,
• rotors of high-power electric motors, heavy dynamos, and industrial generators,
• industrial fluid pumps, ventilation extractor units, and screw air compressors,
• powertrain assemblies and machine tool spindles requiring precise bearing clearance adjustment via M65 threading.

Technical specifications

Note: Exact geometric slot configurations, specific thread tolerances, maximum permissible tightening torque values, and axial load capacities should be cross-verified within current CRAFT manufacturer engineering standards.

Features and benefits

• Precision M65x2 Fine-Pitch Threading – the micro-metric thread pitch allows for highly accurate, smooth, and repeatable adjustment of preloads or total elimination of axial play in ball, spherical, and tapered bearings.
• Secure Mechanical Interlocking via MB Washers – the four circumferential slots match standard MB13 lock washers flawlessly, avoiding accidental backing-off during bidirectional rotational cycles and high-vibration periods.
• High-Tensile Structural Steel – engineered from a highly homogenous steel alloy that resists plastic deformation under relentless, massive axial force profiles.
• Optimized Dimension Profile – an outer diameter of 85 mm coupled with a height profile of 11 mm offers an ideal balance between superior stripping resistance and the ability to be fitted in restricted machine spaces.
• Streamlined Hook Spanner Mounting – the optimized depth and width of the structural drive slots avoid tool slippage, shielding the outer face from burring or rounding off during high-torque tightening.
• Excellent Fatigue Resistance – preserves total dimensional accuracy and thread integrity across high-vibration, shock-prone heavy powertrain applications under intense industrial wear.
• Cost-Effective Premium Standards – the CRAFT brand ensures full dimensional compliance with standard DIN 981 regulations, delivering an economical alternative for both industry and aftermarket service sectors.

Why it is worth buying?

The KM13 CRAFT bearing locknut is the definitive cost-effective engineering choice for precision axial clamping of rotating components on shafts with a 65 mm thread diameter. Harnessing its robust steel matrix, precision-cut M65x2 fine thread, and full technical compatibility with standard MB tab-locking security systems, this component stabilizes the operational metrics of your machinery lines. Investing in a genuine CRAFT locknut promises secure installation, quick field service turnarounds, simplified routine maintenance adjustments, and aggressive defense against catastrophic field failures caused by loose rotating assemblies under heavy industrial duties.