T38 Spline Shank Adapter: Technical Specifications, Material Selection, and Best Application Practices

The T38 spline shank adapter is a critical component of heavy-duty rock drilling rigs, used to transmit high torque and impact energy between the rock drilling piston and the drill rod. As a professional manufacturer of rock drilling tools, Yanggu Henglong Machinery Equipment Co., Ltd. has optimized the design and manufacturing process of this adapter to withstand harsh mining and tunneling environments. This article details its technical parameters, material science, and field-proven application guidelines to help operators maximize drilling efficiency and extend component life.

• Spline Configuration: 6 external splines, nominal diameter 38mm, standard length 159mm (custom lengths available according to customer drawings)
• Material: 23CrNi3Mo alloy steel, surface carburized, hardness HRC 40-45 (carburized layer depth 5-8μm)
• Fit Tolerance: Clearance with drill sleeve ≤0.5mm; perpendicularity of cross-section to axis ≤0.02mm
• Heat Treatment: Quenching + tempering to achieve core toughness (HRC 30-35) and surface wear resistance
• Certification: ISO 9001 and CE certified

Henglong's T38 spline shank adapter uses high-quality 23CrNi3Mo alloy steel and undergoes a rigorous multi-step process: forging → precision CNC machining → carburizing → heat treatment → straightening. The forging process improves material density and avoids internal defects; precision CNC machining ensures the accuracy of all dimensions; the overall carburizing treatment forms a wear-resistant surface layer, while the tough core effectively absorbs impact fatigue. Compared to standard carbon steel adapters, our T38 spline shank adapter has a 40% longer service life, reducing replacement frequency and thus lowering overall operating costs for customers.

1. Matching: Specifically designed for T38 drill rods. Before installation, verify the number of splines, thread pitch, and flushing hole position to ensure a tight fit and avoid energy loss during operation. Suitable for high-torque heavy-duty rail-mounted rotary rock drilling machines.
2. Inspection: Before each use, please check the flatness of the end face and inspect for cracks or wear on the surface. If the wear exceeds 0.3 mm, please replace it promptly to prevent safety hazards during operation.
3. Maintenance: After use, please clean the adapter surface, remove dust and debris, and apply lubricating oil for maintenance; store it in a dry and ventilated environment to prevent corrosion.

The correct selection and maintenance of the T38 spline shank adapter directly affects drilling speed and operational stability. Henglong's T38 spline shank adapter can increase drilling efficiency by up to 25% and minimize premature failures, thus reducing downtime. For medium-hard to hard rock formations (f>10), this adapter outperforms flange/lug-type adapters in terms of torque transmission stability, making it an ideal choice for mining, quarrying, tunneling, and other heavy-duty rock drilling projects.