Glossary of Tooling Components for Workholding on Machine Tool Tables


A T-Slot Bolt is a bolt with a “T” shaped head that is designed to slide into the channel of a machine tool table for secure and stable workholding during machining. The T-shape head and shank diameter are specifically sized to fit into machine workholding applications. Multiple sizes are available to accommodate the channels in machine tools. Once fastened to the table with T head of the T Slot Bolts positioned within the channels in the table, it is nearly impossible for the piece to twist or jam ensuring accuracy during the machining process. T slot blots are hot forged from C-1045 steel. Class 3 N.C. and can be heat treated upon request. Also available in metric sizes.
T-Slot Bolt
A fastening nut that is shaped like a “T” and is designed to slide into the channel of a machine tool table for workholding during machining. A Double Ended Steel Stud is usually screwed into the top of the nut thus firmly fastening the device being machined to the workholding table with a mechanical connection that is difficult to nearly impossible to break due to compression from top and bottom as well as channels restricting movement in all three axis’. Machined from cold finished steel bar stock and case hardened for optimal strength. Also available in metric sizes.
T-Slot Nut
A hexagonal fastening nut with a flanged base almost as if a washer and nut were combined (also known as a collar nut or hexagonal collar nut). Commonly used with a T-Slot Bolt or T-Slot Nut/Stud to tighten down work on a machine tool table for a firm hold on products during the machining process. Flanged nuts come in a variety of sizes to accommodate shank diameters and slot restrictions. Machined from 12L14 bar stock and case hardened for optimal strength. Available in metric sizes as well.
Flanged Nut
A hexagonal fastening nut that is extra thick with a washer bearing surface that is usually used with a Washer for workholding applications with a T-Slot Bolt or T-Slot Nut/Stud. Extra thick and machined from cold finished bar stock and case hardened for optimal workholding performance. Also available in metric sizes.
Extra Thick Hex Nut
A stud threaded on both ends to be screwed into a T-Slot Nut on one end and Hex Nut or Flanged Hex Nut on the other end. Ideally suited to facilitate workholding while machining large parts with special setup and jig requirements. Made from high quality C-1038/45 steel with tensile strength Approx. 100,000 lbs. P.S.I. Also available in metric sizes.
Double End Studs
An extra thick flat washer machined from steel bar which has which has a chamfered outside edge. Other edges of the washer are slightly beveled and smooth. Machined from 12L14 cold rolled steel bar. Inside diameter specifications of 1/64 to 1/32 over size of bolt. Extra thick washers are ideal for machine workholding applications due to high strength from increased volume of washer thickness. Also available in metric sizes.
Extra Thick Flat Steel Washer
Also known as an Extension Nut, these are hexagonal shaped fastening nuts with an extended body usually used to couple two studs together for a secure, extra-long extended bolt. Machined from 12L14 cold finished hex bar stock for optimal strength. Also available in metric sizes.
Coupling Nut
A drop forged piece of steel in the shape of a tapered incline used for leveling equipment, flanging pipe, etc. Drop forged steel set-up wedges are manufactured from C-1020/30 steel and are a machine shop necessity for workholding during machining as well as leveling jigs and fixtures.
Forged Steel Setup Wedge
A forged flat bar clamp used for workholding applications in a machine shop. Made from C-1030 steel for extra strength during machining applications. Plain clamps are often used in conjunction with T slot bolts and other jig and fixture components for optimal workholding of parts in machining applications.
Forged Plain Clamp
A forged clamp in the shape of a “U” designed for workholding application in a machine shop. Forged steel U clamps are made from C-1030 steel for optimal strength. U clamps are ideally shaped for machining workholding jigs and fixtures.
Forged Steel U-Clamp
A forged bar clamp with an offset with a ‘gooseneck’ shape which is designed for workholding applications in machining applications. Forged gooseneck clamps are made from C-1030 steel for strength during high stress usage in machine tools. The gooseneck shape is commonly required for securing machined parts during the machining process.
Goose Neck Clamp
A forged bar clamp with a finger like end on one end designed to hold a tooling die in place. Made from C-1030 steel. Commonly used with T slot bolts and nuts and shaped for optimal workholding applications.
Finger Clamp
A curved bar clamp with an adjustable sliding saddle designed for workholding applications. Ideally paired and appropriately sized for use with T slot bolts and nuts for rigid and extra secure workholding during machining applications. Made from C-1030 steel and designed for easy adjustment.
Universal Adjustable Strap Clamp
Shoulder Eye Bolts (round) are forged from C-1030 steel and include a shoulder and short threaded shank with a circular ‘eye’ designed for vertical lifting on vertical lifts. Shoulder eye bolts are a common necessity in machining applications where workholding requires heavy lifting and positioning. Eye bolts have other uses as well but the shoulder incorporated into the bolt makes them ideal for machining and workholding.
Shoulder Eye Bolt
A 2 piece block machined from steel with serrations for adjustable heights used in workholding applications in a machine shop. The serrations are adjustable in 1/8″ increments for secure and accurate positioning and holding on machine work tables.
Step Block
A workholding clamp for machining applications that is machined from heat treated steel bar with black oxide finish. Plain clamps are used as workholding devices as jigs & fixtures for adjustable but secure clamping of pieces being machined. Commonly used with other workholding components such as T-slot bolts and nuts.
Plain Clamp
A serrated step clamp has serrations designed to be used with serrated step blocks for workholding in machining applications. Step clamps have serrations to match those of step blocks and allow for secure positioning of work pieces on machine tables. Adjustable slot allows for ease of setup and positioning of work pieces. Often used in combination with T-slot bolts and other workholding components, jigs, and fixtures.
Serrated Clamps
Often called jigs & fixtures, workholding devices are used to secure billets and workpieces onto machine tables in machining applications. Various components are designed specifically to fit into slots on work tables to ensure a secure fit that will not move during the machining operations. Common components include T-slot bolts, T-slot nuts, coupling nuts, extension nuts, step blocks, gooseneck clamps, extra thick washers, and forged steel clamps.
A generic term common in the machining industry that is often used in conjunction with “fixtures” or “workholding”, and refers to the setup and securing of workpieces on the machine in a manner that will hold the pieces in a specified orientation without allowing for movement of the piece during the machining process. Jigs allow for repeatability of machining operations and are commonly configured by utilizing components such as T-slot bolts, T-slot nuts, shoulder eye bolts, step clamps, serrated blocks, and more which are specifically designed to fit into the slots and holes in machine work tables.