ESCO® Ultralok® U25 Teeth & Adapters

U25 System Definition

The U25 size defines the engineered interface between tooth and adapter within the ESCO® Ultralok® system.

Fitment: Selection is determined exclusively by the stamped “U25” marking on the worn part.
Reference class: U25 is typically used on 10–14 tonne excavators.
Note: Machine weight and bucket width are reference values only, not a primary identifier.

Locking: The lock is integrated into the tooth. No separate locking pins are required.

Position within the Ultralok® System Hierarchy

For correct parts identification, U25 is positioned between the adjacent sizes:

• U20: typical range 6–10 tonnes

• U25: typical range 10–14 tonnes

• U30: typical range 15–20 tonnes

Choosing the wrong system size can lead to tolerance issues, misalignment, and premature wear.

→ Other sizes: [U20] | [U30] | [U35] | [U40] | [U45] | [U55] | [U60]

U25 Tooth Geometries in Use

Depending on ground conditions and application, the following shapes are available:

• U25S (Standard): general earthmoving

• U25C (Chisel): improved penetration in heavy/binding soils

• U25P (Pick): increased penetration for harder material

• U25F (Flare): wider profile for trench bottoms and grading

• U25AP (Abrasion): increased wear volume for abrasive conditions

• U25T (Twin): corner and ripping positions

U25 Adapter Variants & Cutting Edges (25 mm / 30 mm)

The adapter transfers forces into the bucket lip via a form-fit connection.
In addition to system size U25, the cutting edge thickness is the key selection criterion.

Typical cutting edge/lip thickness for U25:

• 25 mm

• 30 mm

Available variants:

• Single strap weld-on adapters

• 1-1/2 strap variants

• Corner adapters

• Bolt-on adapters

Technical Identification Before Ordering

To avoid incorrect orders, please verify:

• Is “U25” clearly stamped on the worn part (tooth and/or adapter)?

• What is the cutting edge thickness (25 mm or 30 mm)?

• Which adapter type is installed (single strap, corner, bolt-on, etc.)?

• Which tooth geometry matches your application?

If in doubt, LIS® technical support will assist you.

Note: ESCO® and Ultralok® are registered trademarks of their respective owners.