MNJ Machining Ltd. designs and machines custom tooling for industrial and specialty applications from our Toronto facility. Whether you need a one-off boring tool holder, a production run of specialty tooling, or a complete kit for a specific application, we machine it to your drawings with the same precision we bring to every component.
Holders for Indexable Boring Inserts
MNJ specialises in the precision machining of custom holders for indexable inserts used in boring operations. Boring holder geometry is demanding — insert pocket location, angle, and surface finish directly determine cutting performance, insert seating, and the ability to hold bore diameter and finish across a production run. We hold the tight tolerances on pocket geometry and shank concentricity that these tools require, and we have the practical understanding of boring processes that informs good holder design. We work from customer drawings or can collaborate on geometry for specific boring applications.
Bicycle Bearing Press Kits
MNJ produces custom bearing press and removal kits for the consumer bicycle repair industry. Bottom bracket shells, headset cups, and press-fit bearing interfaces demand tooling with precise piloting diameters, controlled press faces, and surface finishes that protect bearing races during installation. We machine complete kits — drivers, adapters, and guides — to exacting tolerances, suitable for professional shop use or retail sale. Short runs and repeat production orders are both welcome.
Other Custom Tooling
• Jigs & fixtures for machining, welding, and assembly operations
• Go/no-go gauges and custom inspection aids
• Replacement tooling reverse-engineered from worn or obsolete originals
• Prototype tooling for product development programs
• Vacuum molds and mold components for composite and forming applications
• Specialty arbors, mandrels, and workholding components
Get a Quote
Send drawings or describe your application to orders@mnjcnc.com or call (416) 419-1651. We respond within 1–2 business days.