KS TOOLS 1/2 inch KM4 Lock Nut Wrench Socket, External Pins, Chrome Vanadium (450.5004)

KM4 lock nuts secure bearings and shafts in machinery, but without the right tool, tightening or loosening them risks damage to the nut, the shaft, or your knuckles. This KS TOOLS 1/2" drive lock nut wrench socket eliminates that struggle: it engages the nut's external pin holes precisely, letting you apply controlled torque with a standard ratchet or torque wrench.

Who is it for

Professional mechanics, millwrights, and maintenance technicians who service gearboxes, spindles, and bearing assemblies where DIN 981 KM4 lock nuts are used. If you work on industrial machinery, automotive transmissions, or heavy equipment, this socket belongs in your toolbox.

Main features

• Precision-machined external pins (4 mm diameter, 25 mm spacing) fit KM4 lock nuts perfectly, preventing slippage and nut damage.
• 1/2" square drive connects to any standard ratchet, breaker bar, or torque wrench for accurate tightening.
• Forged from high-quality chrome vanadium steel with a matt chrome finish for corrosion resistance and long service life.
• Compact 55 mm overall length reaches nuts in tight spaces where a traditional hook spanner won't fit.
• Complies with DIN 981 for KM nut dimensions, ensuring compatibility with genuine KM4 lock nuts.

Specifications

• Drive size: 1/2" (12.5 mm) square
• Compatible nut type: KM4 (DIN 981)
• Pin configuration: 2 external pins
• Pin diameter: 4 mm
• Pin spacing (center-to-center): 25 mm
• Material: Chrome vanadium steel
• Finish: Matt chrome plated
• Overall length: 55 mm
• Outer diameter (wrench head): 38 mm
• Inner diameter (engaging groove): 25 mm
• Weight: 0.15 kg

Tips

Always clean the nut's pin holes before use to ensure full pin engagement. For critical applications, use a calibrated torque wrench and follow the manufacturer's torque specification. Store the socket in a dry place to preserve the chrome finish.