Sumitomo BM50 to SR81 Modular Reamer Holder 140mm SRA81-56-BM50-140
Overview
The Sumitomo SRA81-56-BM50-140 Modular Reamer Holder is a precision tool holder designed for industrial machining. It is identified by the SRA81-56-BM50-140 part number and provides a BM50 to SR81 modular connection. The holder has a 140mm length, which provides reach for deep hole reaming and difficult to access features. The modular design allows the holder to be used with compatible reamer heads and machine spindles. This type of tooling is common in automotive, aerospace, and general engineering production. The holder is built for accuracy, rigidity, and reliable performance in demanding machining environments.
Modular Tooling Function
Modular tooling systems allow different cutting heads and holders to be combined for specific operations. The SRA81-56-BM50-140 connects a BM50 interface to an SR81 reamer head. This flexibility helps machine shops reduce tool inventory and setup time. The holder transmits rotation and torque to the reamer head. It must maintain alignment and rigidity to achieve accurate hole size and finish. The 140mm length provides reach while maintaining stability. Proper mounting and runout checks are important for good results. The holder is designed for use with compatible Sumitomo modular tooling components.
Design and Construction
The Sumitomo SRA81-56-BM50-140 holder is made from high strength steel for durability and rigidity. The connection interfaces are machined to precise tolerances for secure mounting. The body is designed to resist bending and vibration during machining. Coolant passages may be present to help clear chips and cool the cutting zone. The holder is balanced for smooth rotation at recommended speeds. Proper handling and storage help prevent damage to the connection surfaces. The design supports reliable performance in production and maintenance machining.
Compatibility and Setup
Technicians should confirm that the holder matches the required machine spindle and reamer head interfaces. The BM50 and SR81 references help identify compatibility. The spindle and holder surfaces should be clean and free from damage. The holder should be mounted securely and checked for runout. Cutting speed and feed should be selected according to the workpiece material and reamer head. Coolant should be directed to the cutting zone. After machining, the hole should be measured to confirm size and finish. Following approved setup procedures helps ensure accurate results and long tool life.
Applications
The Sumitomo SRA81-56-BM50-140 Modular Reamer Holder is used in many machining applications. It is common in engine and transmission manufacturing, hydraulic component production, and general precision machining. It is used on machining centers, transfer lines, and specialty reaming machines. The holder is suitable for finishing holes in steel, cast iron, aluminum, and other materials. In production, it helps maintain consistent hole quality and reduce cycle time. In maintenance shops, it supports repair and reconditioning work. For machinists, the modular holder provides flexibility and accuracy.
Maintenance and Care
Regular maintenance helps extend the life of the modular holder. The connection surfaces should be cleaned and inspected before use. The holder should be checked for wear, cracks, and damage. Runout should be measured periodically. The holder should be stored in a protective case. Cutting parameters should be reviewed if hole quality changes. Worn or damaged holders should be replaced promptly. Following these practices helps maintain accurate hole finishing and reduces machining costs. Proper handling also helps prevent injury and tool damage.
Conclusion
The Sumitomo SRA81-56-BM50-140 Modular Reamer Holder with BM50 to SR81 connection and 140mm reach is a precision tool for industrial hole finishing. It provides accuracy, rigidity, and reliable performance. Its modular design supports flexible setup and efficient tool changes. Correct selection, proper setup, and regular maintenance help ensure dependable service. For machine shops and production facilities, this reamer holder is a practical and important part of the machining process.
