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Geith|SKU:AK12L015

Geith Auto-Klamp Mechanical Thumb (AK) — AR400 Steel, 12–22 Ton Excavators, No Hydraulics Required

Fits 12-22 Ton

The thumb that does the job your bucket can't — bolted on in an hour, no hydraulic headaches.

Elevate your excavator’s capability with the Geith Auto-Klamp Mechanical Thumb, engineered for professionals who demand seamless efficiency and uncompromising durability. Its innovative auto-slide system enables rapid deployment without extra hydraulics, while the AR 400 steel construction ensures unwavering performance in the toughest conditions.

No hydraulics needed — Mechanical auto-slide delivers consistent grip without extra circuits
AR400 steel frame — Outlasts mild-steel thumbs on rocky demolition jobsites
Deploys in seconds — Auto-storage saves time between grabs, shift after shift
12–22 ton fitment — Weight-class configs matched to your exact excavator
Grips logs, rock, debris — One attachment handles clearing, demo, and excavation
  • FREE Freight -- Ships assembled from US warehouse. Tracking emailed the day it ships.
  • FREE Fit-Check Call -- Verify weight class and coupler fit with a real operator before you buy.
  • Price Match Guarantee -- Send us an authorized US dealer quote — we'll beat it.

Price range: $6,088.97 through $9,584.97

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Geith Auto-Klamp Mechanical Thumb (AK)
$6,088.97 – $9,584.97Price range: $6,088.97 through $9,584.97

60-day money back · No restocking fee

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4.9/5 Stars 2,400+ verified reviews.

In the box

  • Geith Auto-Klamp Mechanical Thumb (AK)
  • Mounting hardware and pivot pins
  • Installation guide
geith-auto-klamp-mechanical-thumb-ak-HERO
Geith Auto-Klamp Mechanical Thumb (AK) — AR400 Steel, 12–22 Ton Excavators, No Hydraulics Required
$6,088.97 – $9,584.97Price range: $6,088.97 through $9,584.97

The thumb that does the job your bucket can't — bolted on in an hour, no hydraulic headaches.

Every operator who's tried to move a mixed pile of logs, concrete, and rock with just a bucket knows the frustration. You're making 10 passes where one should do. The Geith Auto-Klamp Mechanical Thumb closes that gap. Its patented auto-slide system stores flush when you don't need it and swings into position the moment you do — no extra lever, no rerouted hydraulic line, no $1,200 kit sourced from a seller you'll never find again. AR400 steel construction means the tines take the abuse your jobsite dishes out and come back for more. Available in three weight classes (12–15T, 16–18T, 20–22T) to match your rig exactly. This is operator-grade craftsmanship, not a catalog filler.

FREE SHIPPING ON QUALIFYING ORDERS60-DAY MONEY-BACK GUARANTEEGUARANTEED FIT OR WE PAY RETURN FREIGHTUS-BASED EXPERT SUPPORTAFFIRM FINANCING AVAILABLEFREE SHIPPING ON QUALIFYING ORDERS60-DAY MONEY-BACK GUARANTEEGUARANTEED FIT OR WE PAY RETURN FREIGHTUS-BASED EXPERT SUPPORTAFFIRM FINANCING AVAILABLEFREE SHIPPING ON QUALIFYING ORDERS60-DAY MONEY-BACK GUARANTEEGUARANTEED FIT OR WE PAY RETURN FREIGHTUS-BASED EXPERT SUPPORTAFFIRM FINANCING AVAILABLEFREE SHIPPING ON QUALIFYING ORDERS60-DAY MONEY-BACK GUARANTEEGUARANTEED FIT OR WE PAY RETURN FREIGHTUS-BASED EXPERT SUPPORTAFFIRM FINANCING AVAILABLEFREE SHIPPING ON QUALIFYING ORDERS60-DAY MONEY-BACK GUARANTEEGUARANTEED FIT OR WE PAY RETURN FREIGHTUS-BASED EXPERT SUPPORTAFFIRM FINANCING AVAILABLEFREE SHIPPING ON QUALIFYING ORDERS60-DAY MONEY-BACK GUARANTEEGUARANTEED FIT OR WE PAY RETURN FREIGHTUS-BASED EXPERT SUPPORTAFFIRM FINANCING AVAILABLE
AR400 Steel Construction
Mechanical Auto-Slide
Lifetime Frame Warranty
Ships from USA
3×
harder than mild steel — AR400 grade
0
extra hydraulic circuits required
12–22T
excavator weight class coverage
geith-auto-klamp-mechanical-thumb-ak-HERO

No Extra Hydraulics. No Guesswork. Just Bolt It On and Get Back to Work.

You've seen the other listings — mechanical thumbs that require rerouting your auxiliary circuit, or worse, a kit sourced separately from a seller you'll never find again. That's the enemy. The Geith Auto-Klamp's patented auto-slide mechanism works without tapping your hydraulic system at all. Our Fitment Checker matches this thumb to your exact excavator make, model, and weight class before it ships — so there's no "this better fit my machine" moment at the jobsite. If it doesn't bolt on correctly, we pay the freight both ways. No restocking fee. No runaround.

geith-auto-klamp-mechanical-thumb-ak-Alt-1

AR400 Steel That Takes a Beating Shift After Shift.

AR400 abrasion-resistant steel is 3–4 times harder than the mild steel used in off-brand thumbs. That gap matters when you're gripping concrete rubble, ripping through root balls, or sorting rip-rap on a land-clearing site. Geith forged this thumb to take the punishment that makes mystery-metal forks and buckets fold. Replaceable wear parts mean you're not buying a new thumb every season — you're swapping a bolt-on part and getting back on the jobsite the same afternoon. Built for the long haul. Like every piece of steel we carry.

geith-auto-klamp-mechanical-thumb-ak-HERO

Demo, Clearing, Excavation — One Thumb Handles Every Pile Your Crew Throws at It.

The Auto-Klamp isn't a specialty tool for one job. Grip and haul logs on a land-clearing site Monday. Sort broken concrete from a slab demo Tuesday. Move pallet-size rocks on a pond excavation Wednesday. The auto-slide design stores flush against the arm when you don't need it, so your bucket still works clean without fighting the thumb. Three weight-class configurations with coupler and no-coupler options mean this fits the machines your crew actually runs — not just the ones listed on a spec sheet.

Will it fit your excavator?

The Geith Auto-Klamp is available in three weight-class configurations with coupler and no-coupler length options. Select the spec that matches your machine's operating weight and quick-coupler setup.

  • 12–15 Ton excavators (Coupler Length or No Coupler Length)
  • 16–18 Ton excavators (Coupler Length or No Coupler Length)
  • 20–22 Ton excavators (Coupler Length or No Coupler Length)

One Thumb. Every Pile Your Jobsite Throws at You.

From demo rubble to land-clearing logs — the Auto-Klamp grips what your bucket alone can't.

Log & brush clearing
Rock & rip-rap sorting
Demolition debris handling
Excavation & backfill
Scrap & salvage sorting

Full specifications

At a glance

Surface
AR400 Abrasion-Resistant Steel
Warranty
Lifetime
Full specifications12 data points across 4 categories

Dimensions

Excavator Weight Class12–15 Ton, 16–18 Ton, 20–22 Ton
Attachment StyleCoupler Length / No Coupler Length

Power & Performance

Operation TypeMechanical (Geith Auto-Klamp auto-slide system)
Hydraulics RequiredNone — no auxiliary circuit needed
DeploymentAutomatic storage and rapid clamping deployment

Materials

Frame MaterialAR400 Abrasion-Resistant Steel
Wear PartsBolt-on replaceable

Compliance & Warranty

Frame WarrantyLifetime
Wear Parts Warranty1 year parts & labor
Fit GuaranteeMoney-back, return freight paid both ways
ManufacturerGeith
Ships FromUS-based warehouse, ships assembled

Our Promise

Every attachment we carry is one we'd bolt to our own rig. Honest specs, real support, a guarantee that means something.

Guaranteed FitWrong size for your machine? We pay return freight both ways. No restocking fee, no runaround.
Ships Assembled from the USArrives ready to bolt on from a US warehouse. Tracking emailed the day it ships.
Lifetime Frame WarrantyThe AR400 steel frame is backed for life. Wear parts are bolt-on replaceable, not throwaway.
★★★★★
“Bolted this onto my CAT 323 in under an hour — the auto-slide is exactly what they say it is. No fighting it between grabs, no hydraulic lines to run. Moved mixed demo rubble all week without a single hangup. My old thumb was a nightmare to store. This one just disappears when you don't need it. Worth every dollar.”
M
Marcus T.Nashville, TN

Geith Auto-Klamp Mechanical Thumb (AK)

Maximize your excavator’s versatility and on-site productivity with the Geith Auto-Klamp Mechanical Thumb (AK)—a premium attachment engineered for professionals who demand precision, durability, and efficiency. Designed to eliminate downtime and streamline material handling, this mechanical thumb allows you to grip, sort, and move debris, rocks, and logs with ease. Whether you are tackling demolition, site clearing, or excavation, the Geith Auto-Klamp delivers a seamless, hassle-free experience that keeps your projects moving forward.

Key Features

  • Innovative Auto-Slide System: The patented auto-slide mechanism allows for rapid thumb deployment and automatic storage, saving valuable time on the job site. No need for extra hydraulics or complex controls—just simple, reliable operation.
  • Ultra-Tough AR 400 Steel Construction: Built from abrasion-resistant AR 400 steel, this thumb is engineered to withstand the most demanding heavy-duty applications, ensuring long-lasting performance and minimal wear.
  • Hassle-Free Operation: Eliminate the complexity of hydraulic systems. The mechanical design provides consistent clamping force without additional maintenance, making it ideal for high-volume work environments.
  • Easy Installation: Designed for fast setup with automatic storage features, the Geith Auto-Klamp integrates quickly with your excavator, so you spend less time configuring and more time working.
  • Versatile Compatibility: Available in multiple weight class configurations to match your specific excavator, ensuring optimal balance and performance across a range of tasks.

Specifications

  • Excavator Weight Class: 12–15 Tons, 16–18 Tons, 20–22 Tons
  • Attachment Style: Coupler Length, No Coupler Length
  • Material: AR 400 Abrasion-Resistant Steel
  • Operation Type: Mechanical (Auto-Klamp system)
  • Price: $6,088.97

Why Choose Geith Auto-Klamp Mechanical Thumb (AK)

The Geith Auto-Klamp Mechanical Thumb (AK) stands apart as the premier choice for construction and excavation professionals who refuse to compromise on quality or efficiency. Unlike traditional hydraulic thumbs that require costly add-ons and complex maintenance, the Auto-Klamp’s mechanical design offers a straightforward, cost-effective solution that delivers instant results. Its auto-slide feature not only accelerates deployment but also enhances safety by reducing manual handling. Crafted from AR 400 steel, it provides unmatched durability in the toughest environments, from rocky terrain to scrap handling. Backed by Geith’s reputation for engineering excellence, this thumb is a smart investment that boosts your excavator’s capability, reduces operational costs, and delivers consistent, reliable performance job after job. Choose the Geith Auto-Klamp and experience the difference that premium design and rugged construction make on every worksite.

Additional information

Excavator Weight Class

12-15 Tons, 16-18 Tons, 20-22 Tons
Attachment Style

Coupler Length, No Coupler Length

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Frequently Asked Questions

The thumb ships as a complete unit ready for installation. No major assembly is required beyond mounting it to your excavator’s existing pin-on setup. Always refer to the included installation guide for proper attachment and safety checks.
This thumb is designed for use with excavators that have a standard pin-on coupler system. Compatibility depends on machine size and pin spacing; verify your excavator’s specifications against the thumb’s dimensions before purchase to ensure a proper fit.
It is constructed from ultra-tough AR 400 steel, which provides exceptional durability and wear resistance for heavy-duty applications. This material choice ensures reliable performance in demanding construction and excavation environments.
The auto-slide system allows the thumb to deploy and retract quickly without requiring additional hydraulic lines or controls. It uses a mechanical spring and slide mechanism that engages automatically, saving time and simplifying operation.
Routine maintenance includes inspecting the slide mechanism and pivot points for wear, keeping them clean and lubricated. Check all bolts and mounting hardware periodically for tightness. No hydraulic maintenance is needed due to the mechanical design.
Returns are subject to the store’s standard policies; contact customer support for authorization and details. For installation or operation questions, reach out to the support team with your order information and machine specs for assistance.
This product is intended for professional operators and contractors in construction, excavation, and demolition who need a durable, easy-to-use thumb for picking, sorting, and holding materials. It suits those seeking a mechanical solution without hydraulic complexity.
SKU: geith-auto-klamp-mechanical-thumb-ak Categories: , Brand:

Our Promise

Every attachment we carry is one we'd bolt to our own rig. Honest specs, real support, a guarantee that means something.

Guaranteed Fit Wrong size for your machine? We pay return freight both ways. No restocking fee, no runaround.
Ships Assembled from the US Arrives ready to bolt on from a US warehouse. Tracking emailed the day it ships.
Lifetime Frame Warranty The AR400 steel frame is backed for life. Wear parts are bolt-on replaceable, not throwaway.

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About Geith Mechanical Thumb

Geith manufactures professional-grade buckets, hydraulic thumb, mechanical thumb, quick coupler, and pallet forks for skid steers, excavators, and compact equipment. Shop 15 Geith attachments at Iron Attachments with competitive pricing and fast US shipping.
View all Geith products →

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