Weld-On Stiff-Arm Thumb - ACS

ACS Weld-On Thumbs are designed to be universal — one thumb will install on any model excavator within the same class size.  This removes the cost of customization from of the manufacturing process and provides a quality built thumb at significant savings.

Rigid-link connection between the thumb body and stick.  Manually adjustable to three different working angles with a fourth position for stowing out of the way when not in use.  No hydraulics are required for this thumb.

Upgrade to a Direct Connect Hydraulic Thumb.  Field Upgrade Kit to add a hydraulic actuation to your thumb is available.

ACS Thumbs come standard with (2) serrated or smooth teeth crafted from tough, abrasion resistant HX400 material. The teeth can be trimmed to length to match your bucket tooth spacing as well as the bucket tip radius. The Teeth provided are long enough to cover the extended tip radius of coupler equipped machines as well. Full Installation guidelines are included with the ACS Thumb. Extra teeth are available at the time you order the thumb if more than 2 teeth are desired for the application.


Extra tooth or teeth. 

Important Notes

Not compatible with coupler-equipped machines.  Teeth are shipped loose and require field installation and custom length trimming to optimize lacing with existing bucket teeth.  Shipping this way allows ACS to remove the cost of customization and provide a quality built thumb at significant savings.

Tech Specs

  • The Kit

    Kit shown is Weld-On Hydraulic Thumb with loose teeth and gussetsView Larger Your ACS Weld-On Thumb kit ships with the teeth and gussets loose so that you can tailor it on-site to lace with the teeth on your bucket.

Machine Requirements

Weld-On Thumbs are not compatible with coupler-equipped machines. Machine must have third-function hydraulics to actuate thumb cylinder.
Thumb Size Table
Class Thumb Kit Weight
US Pounds
All weights are approximate. Weights are estimated assuming no add-ons, options or payloads.
6-8 Metric Tons
13,200-17,600 lbs
Weld-On Thumb with Bracket and 2 Teeth 425 lbs
Extra tooth 18 lbs
8-14 Metric Tons
17,600-30,800 lbs
Weld-On Thumb with Bracket and 2 Teeth 600 lbs
Extra tooth 30 lbs
14-18 Metric Tons
30,600-39,600 lbs
Weld-On Thumb with Bracket and 2 Teeth 600 lbs
Extra tooth 30 lbs
18-22 Metric Tons
39,600-48,400 lbs
Weld-On Thumb with Bracket and 2 Teeth 1,031 lbs
Extra tooth 30 lbs
22-28 Metric Tons
48,400-61,600 lbs
Weld-On Thumb with Bracket and 2 Teeth 1,031 lbs
Extra tooth 30 lbs


  • Extra Thumb Teeth

    Extra Thumb Teeth Extra teeth and gussets are available.
  • Serrated or Smooth Teeth

    Serrated or Smooth Teeth Serrated teeth provide a more secure grip on the material being handled. Smooth teeth don't mar or cut into the material. We recommend smooth teeth for working with things like logs that will be cut into lumber or stones intended for use in decorative landscaping.

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Dealer Pricing

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1 (330) 678-2511

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