High-Strength Excavator Dozer Grader Bolt and Nut - China Suppliers & Factory for Undercarriage Parts

This high-tensile Tooth Block Screw (also known as an Adapter Bolt or Segment Bolt) is a critical fastening component designed for heavy-duty earthmoving machinery. It is engineered to securely attach cutting edges, blade segments, and adapter tips to excavator buckets and bulldozer blades. Manufactured to meet rigorous industry standards, this bolt ensures maximum stability and safety in extreme operating conditions.

• ★ Superior Material Strength: Forged from high-quality 40Cr Alloy Steel, offering excellent toughness and durability.
• ★ High Hardness Grade: Heat-treated to achieve Grade 12.9 tensile strength, providing exceptional resistance to stretching and deformation.
• ★ Precision Design: Features a specialized head profile (Round/Flat Head with drive slots) designed to sit flush against the blade or adapter, minimizing wear and preventing loosening under high vibration.
• ★ Anti-Corrosion Finish: Treated with a protective coating (black oxide or similar) to resist rust and corrosion in harsh environments.
• ★ Easy Installation: Designed for quick assembly and disassembly, reducing machinery downtime during maintenance.

Widely used in the undercarriage and ground engaging tools of various construction machinery, including:

• ⚙ Excavators: Securing bucket adapters and side cutters.
• ⚙ Bulldozers: Fixing cutting edges and end bits.
• ⚙ Motor Graders: Attaching blade segments.
• ⚙ Loaders: Bucket tooth systems.

• Q What is a Tooth Block Screw (Adapter Bolt) used for?
  A Tooth Block Screw, also called an Adapter Bolt or Segment Bolt, is used to securely fasten cutting edges, blade segments, and adapter tips onto excavator buckets, bulldozer blades, motor grader blades, and loader buckets. It is an essential fastener for ground engaging tools in heavy-duty construction machinery.
• Q What material is this Tooth Block Screw made from?
  This bolt is forged from 40Cr Alloy Steel and heat-treated to achieve a Grade 12.9 tensile strength rating. This combination provides outstanding toughness, high hardness, and excellent resistance to deformation under extreme working loads.
• Q What does Grade 12.9 mean for a bolt?
  Grade 12.9 is one of the highest tensile strength classifications for metric bolts. It indicates a minimum tensile strength of 1220 MPa and a minimum yield strength of 1100 MPa. This grade is specifically chosen for heavy-duty applications where bolts are subjected to intense vibration, shear, and load forces — such as those found in earthmoving equipment.
• Q Is the surface treatment of this bolt customizable?
  Yes. The standard surface treatment options include Black Oxide, Phosphating, and Painted finishes. Custom surface treatments can also be arranged based on specific project requirements or operating environment conditions to enhance corrosion resistance and service life.
• Q Which OEM brands or machine models is this bolt compatible with?
  This Tooth Block Screw is designed to be compatible with standard construction machinery series, including the widely used 114 series and other common size standards. Compatibility depends on the exact thread size and dimensional specifications. Please contact us with your machine model or OEM reference number for precise confirmation.
• Q How do I install or replace the Tooth Block Screw?
  The bolt features a specialized Round/Flat Head with drive slots that allows for quick assembly and disassembly using standard hand tools or impact wrenches. Its precision head design ensures it sits flush against the adapter surface, reducing maintenance time and minimizing machinery downtime during routine servicing or tooth replacement.