# Toe clamps

Low-profile edge restraint, cam and wedge mechanisms, contact choices and the separate meanings of clamp travel, screw torque and holding force.

Reviewed: 2026-11-02

Tags: tooling, workholding, milling

Mitee-Bite's metric T-Slot Toe table lists **17,800 N holding force**, **88 N·m maximum actuation torque**, and **150 N·m mounting-bolt torque**. IMAO's DK2-VT-W instead lists **50 kN clamping force** and **90 N·m allowable screw torque** for the stated M12 mounting arrangement. Keep each value with its assembly and check the force direction, edge contact and support geometry. [Mitee-Bite T-Slot Toe product page, undated](https://www.miteebite.com/products/t-slot-toe-clamps/), [IMAO DK2/FK2 sheet](https://www.imao.com/files/en/pdf/dk2-double_fk2-double-e.pdf).

Use [Choosing workholding](../workholding-and-fixtures.md) to compare location, support and restraint across fixture types.

## What a toe clamp does

Toe clamps leave the upper face accessible by gripping near an edge. Depending on contact geometry, the nose can push toward a locator and seat the part down. [IMAO side-clamp overview, undated](https://www.imao.com/en/products/sideclamp-en.html)

A top strap instead transfers load from a fastener to the workpiece and heel according to their relative positions. [Carr Lane strap-clamp guide, undated](https://www.carrlane.com/engineering-resources/technical-information/manual-workholding/strap-clamps)

## Cam and wedge mechanisms

| Mechanism | Motion and restraint | Important distinction |
| --- | --- | --- |
| Cam or eccentric actuation | Rotation moves a contact through a short working travel. | Working travel is different from the gross positioning of the clamp body. |
| Screw-driven wedge | Screw motion drives angled surfaces, moving one or more jaws outward and, in some designs, downward. | Wedge angle, friction and geometry determine the relationship between input and output force. |

Mitee-Bite describes its Compact Toe as a cam-action clamp providing positive downforce. IMAO's DK2/FK2 double-wedge diagrams separately identify horizontal pressure against the workpieces and vertical pressure preventing lift. These are examples of the mechanisms, not a claim that every side clamp supplies the same downward component. [Mitee-Bite Compact Toe](https://www.miteebite.com/products/compact-toe-clamps/); [IMAO DK2/FK2 sheet](https://www.imao.com/files/en/pdf/dk2-double_fk2-double-e.pdf), both undated.

## Positioning, contact and support

The Compact Toe instruction sheet locates its base in a milled slot and relates the front of the base to the workpiece through dimension E. Slot depth adjusts installed height. Its **24106** row lists **0.05 inch total movement**, **20.8 ft·lbf maximum torque** and **2,000 lbf holding force**. The movement converts to `0.05 × 25.4 = 1.27 mm`; it is not a long positioning stroke. The sheet distinguishes the cam screw from the mounting screws. [Mitee-Bite Compact Toe instructions, sheet code 1021; issue date not stated](https://www.miteebite.com/wp-content/uploads/2021/10/Compact-toe-Instruction-Inch-1021.pdf)

**Engineering synthesis:** side force needs a reaction through stops or opposing restraint, and downward force needs support beneath the part. Contact above an unsupported edge can bend the workpiece rather than seat it. Contact height, engagement area, stock variation and chip contamination affect the actual force path. A clamp below the top face can still interfere with a cutter, holder or toolpath around the edge; low profile is a geometric advantage, not a collision guarantee.

## Hardened, smooth and machinable contacts

IMAO's CP104 toe clamps have an SCM440 body and an induction-hardened sliding-nose contact face, offered serrated or smooth; the smooth nose is precision ground. For example, **CP104-12022** lists **9 kN clamping force** and **26 N·m allowable screw torque**. A smooth contact is therefore not necessarily a soft jaw. The sheet does not promise mark-free contact or give a separate horizontal/downward force pair. [IMAO CP104 sheet, undated](https://www.imao.com/files/en/pdf/cp104-e.pdf)

For a related machinable edge-clamping approach, Mitee-Bite's Machinable Uniforce uses a steel wedge and a **7075-T6 aluminum channel** with extra jaw stock for profiling. The locking plate stabilizes the jaws during machining and is removed for workpiece clamping. Its model 500 metric table identifies **4.6 mm machinable stock**, separately from spacing and mounting dimensions. This is a named wedge-clamp alternative, not permission to machine away a hardened toe clamp's working surfaces. [Mitee-Bite Machinable Uniforce, undated](https://www.miteebite.com/products/machinable-uniforce-clamps/)

## Torque and force are different specifications

Mitee-Bite's T-Slot Toe page lists **88 N·m torque not to exceed** and **17,800 N holding force** in its metric table, with a separate **150 N·m mounting-bolt torque** note. The manufacturer also describes positive downforce. These entries concern different fastener functions; 150 N·m is not the actuation setting. The page provides smooth and serrated faces on a hardened steel clamping element, respectively for machined and rougher work. [Mitee-Bite T-Slot Toe product page, undated](https://www.miteebite.com/products/t-slot-toe-clamps/)

The IMAO DK2-VT-W double wedge instead lists **50 kN clamping force** and **90 N·m allowable screw torque**, using an M12 screw in the specified mounting arrangements. Its jaws are HRC48–52 steel. These figures belong to that wedge assembly; screw size alone does not establish clamp force, nor does the tabulated force automatically become an allowable cutting load. [IMAO DK2/FK2 sheet, undated](https://www.imao.com/files/en/pdf/dk2-double_fk2-double-e.pdf)

**Original contact example:** assume an actual normal contact load of 8,000 N is distributed uniformly across an 80 mm² patch. Mean pressure is `8,000 / 80 = 100 N/mm² = 100 MPa`. Reducing the patch to 20 mm² raises the mean to 400 MPa at the same force. Serration tips can produce much greater local stress than this average. The assumed load and areas are illustrative, not a material indentation limit or a calculation from screw torque.

## Scope and related reference

The cited pages do not provide a universal torque-to-force conversion, friction coefficient, minimum edge engagement or safe cutting-force envelope. Mounting strength, workpiece deformation, contact condition and load direction remain properties of the complete fixture. The arithmetic does not establish a customer's machining capability.

See [Workholding and fixture references](index.md) for the relationship between location, support and restraint.