Editorial Technical Reference

Replaceable clamping arms for hydraulic swing clamps

Power workholding · replaceable swing-clamp lever

The clamping arm is the replaceable lever carried by a swing-clamp plunger. Its contact position, moving mass and mounting interface must suit the cylinder and the fixture’s loading clearance.

Replaceable lever arms for hydraulic swing clamps, including contact-bolt arms and machinable arm blanks. Welding fixtures (4080) cover the locating and restraint arrangement; Toggle-clamp clamping fixture (5215) covers manual toggle hold-downs. Hydraulic clamping system (2785) covers the complete powered fixture circuit, rather than this replaceable arm.

CNFX editorial research · Sources checked October 16, 2026 · 3 sources

Match the arm to the plunger Check reach and swing inertia

Start with your task

Match the arm to the plungerStandard arm or machined blank. Check reach and swing inertiaPressure and flow limits.

Order the arm blank against the actual clamp model

Carr Lane’s KOSMEK arm listing separates hydraulic LZH blanks for LHA swing-clamp models from pneumatic WHZ blanks for WHE models. For example, LZH0400-T corresponds to LHA0400 and has an overall dimension A of 145 mm. This is the listed blank dimension, not a permitted working lever length. [1]

The same listing describes unfinished steel blanks for machining custom profiles, slots and contact geometry. Select by the matching clamp model and its mounting drawing before machining the arm’s workpiece end. A blank from a pneumatic series does not become a hydraulic-series replacement merely because the external profile looks similar. [1]

Longer reach changes the permitted hydraulic settings

Enerpac’s L1717 instruction sheet states that arm length determines the permitted pressure and flow settings for its swing cylinders. As arm length increases, both clamping force and maximum operating pressure are reduced. Use the chart for that cylinder and arm length when setting the circuit. [2]

ROEMHELD B 1.854 separately addresses longer special arms and their increased rotational inertia. Its accessory flow chart and special-arm flow calculations are marked for vertical mounting only. Have the supplier check the arm’s mass distribution, contact-bolt assembly and mounting orientation before assigning a swing flow; the listed accessory-arm setting is not automatically valid for a longer custom arm. [3]

Seat the arm and keep the contact bolt clear of the flange

Enerpac’s mounting procedure places the arm against the plunger’s retaining ring before tightening its arm bolt to the specified lubricated torque. The instruction warns that inadequate tightening allows the arm to slip. Use the procedure for the exact plunger and arm connection. [2]

For Enerpac’s upper-flange body style, the contact bolt must clear the flange as the arm swings down. Check the entire opening and closing path, including the adjusted contact-bolt projection, against the cylinder flange and the loaded workpiece. [2]

Provide the cylinder ordering code, plunger-interface drawing, contact position and height, arm profile and mass properties, contact bolt, opening clearance and mounting orientation. Request the allowed force, pressure, flow and fastening instructions for that arm/cylinder combination.

Send the contact geometry with the cylinder model

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Cylinder: [ordering code; plunger interface]
Arm: [profile; contact position; mass properties]
Contact: [bolt; pad; adjusted height]
Motion: [opening path; orientation; clearances]
Settings: [required force; permitted pressure/flow; fastening]

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Swing-clamp arm suppliers

Manufacturer profiles associated with Clamping Arm.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 October 2026

Buyer questions

Is the blank’s overall length the usable clamp reach?

Carr Lane lists dimension A for each KOSMEK blank. The working contact position must be checked against the matching cylinder’s permitted arm-length and hydraulic settings. [1] [2]

Can the standard swing flow be kept after fitting a longer custom arm?

ROEMHELD requires a special-arm inertia check and reduced flow for its stated configuration; the cited flow calculations are marked for vertical mounting only. [3]

What can interfere even when the arm clears the workpiece?

Enerpac identifies the contact bolt’s clearance past an upper cylinder flange as a separate check during the swing-down movement. [2]

Sources and what still needs a direct check

Sources checked 2026-10-16. Carr Lane identifies model-matched KOSMEK blanks. Enerpac provides an arm mounting and pressure/flow procedure; ROEMHELD supplies a separate special-arm inertia method whose mounting limitation is retained.

Carr Lane Manufacturing — KOSMEK Swing Clamp Arms, hydraulic blank model table ↗ Supplier’s product catalogue Return to text ↑
Enerpac — L1717 Rev. B swing-cylinder instruction sheet, arm mounting and pressure/flow sections ↗ Manufacturer instruction sheet Return to text ↑
ROEMHELD — B 1.854, Issue 7-21 E, p.4 clamping-arm accessories and special-arm flow ↗ Manufacturer technical data sheet Return to text ↑

Still to check yourself

Match the arm and cylinder model.
Distinguish blank size from working reach.
Check pressure, flow and arm inertia.
Verify fastening and the contact bolt’s swept clearance.

Buyer enquiry

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