Steel Bolster Plates | Precision Grinding, Inc.

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Steel Bolster Plates

Cutting, Grinding & Machining

Bolster plates normally have t-slots or scribed lines running in parallel the length of the bolster plate. There are many variations in size, dimension, and functionality for steel bolster plates. Engineers and tool makers custom design bolsters to meet specific end-use applications.

These plates are normally thicker than 2″. We flame cut, then stress relieve A36 steel plate in order to improve the grinding and machining processes. Though, often times specifications suggest a Blanchard ground to ± 0.005″ thickness tolerance and a ± 0.005 – 0.010″ parallelism tolerance, relaxing tolerance levels may save time and money.

T-Slotted Steel Bolster Plates Large

Large Steel Bolster Plate

Machining Bolster Plate

Machining Bolster Plate


This custom t-slotted plate is 6′ x 4′ large standing on one of our Mill Tables.

Bolster Plate

Bolster Plate

Vertical Machining Centers

Our precision machine shop runs four CNC Vertical Machining Centers.  Maximum capacity for our Johnford Vertical Bridge Mill is 42” height x 110” wide x 162” long at 26,500 lbs. We installed a new Doosan Hybrid Bridge Mill in in June 0f 2020. It’s capacity is 98.5″ Y-Axis x 167″ X-Axis x 31.5″ Z-Axis and can handle up to 30,000 lbs. Our two Takumi CNC Machines are 31″h x 78″ x 122″ at 22,000 lbs. Our CNC machinists average over 5 years experience at PGI Steel. We have three CAD Programming specialists and extensive machining operations ready to bring your prints to life.

Most of these plates require a high-level of expertise when it comes to finishing reamed holes, cutting grooves, beveling or chamfering edges, and end milling or face milling. We can also provide a detailed inspection report using our Renishaw probing system.  In addition, our Takumi is also capable of Horizontal milling edges upon the same piece with the installation of the 90° right-angle head.

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