198-71-21850

The 198-71-21850 is a Komatsu-compatible 1-3/8" countersunk plow bolt with 1-3/8"-6UNC threading. At 114 mm (4-1/2") overall length, this Grade 10.9 fastener is manufactured by AzuLong Wear Parts from 40Cr Alloy Steel with black oxide finish. Designed as a direct replacement for Komatsu OEM parts, it secures cutting edges and wear plates on Komatsu ground engaging equipment including grader blades, loader bucket cutting edges, and dozer end bits.

Grade 10.9, Strength & Performance

Grade 10.9 (Class 10.9) plow bolts provide a tensile strength of approximately 1040 MPa and yield strength of 940 MPa. The higher strength rating makes these bolts essential for heavy-duty cutting edge and ground engaging equipment where bolts must resist shearing forces from rock and compacted material. Manufactured from 40Cr alloy steel with controlled heat treatment to achieve consistent mechanical properties.

1-3/8" Diameter, Size & Application

The 1-3/8" diameter is the largest common plow bolt size, reserved for the heaviest mining and earthmoving equipment. Used on large bulldozer end bits, mining truck body wear plates, and heavy-duty grader cutting edges where bolt failure would cause dangerous equipment damage.

Equipment Compatibility

The countersunk head sits flush with the cutting edge surface, keeping the bolt head out of the material flow path where it would wear fast. Contact rocky@azulong.com or WhatsApp +86-13777046128 for pricing and availability.

• Komatsu Motor Graders (GD655, GD675)
• Komatsu Wheel Loaders (WA380, WA470)
• Komatsu Bulldozers (D65, D85, D155)