KOIHO HUB-05A and HUZ-05A: Alternative Road Milling Picks for Wirtgen W7 Applications

Selecting a Suitable 20 mm-Shank Pick by Application, Toolholder Fit, and Cutting Design

Quick Answer

KOIHO HUB-05A and HUZ-05A can be considered as alternative road milling picks for Wirtgen W7-type applications when the toolholder system, 20 mm shank interface, cutting requirement, and jobsite conditions are suitable. They do not need to duplicate every W7 design detail to serve as a practical replacement option.

The correct replacement decision should be based on the complete working system—not only a single catalog dimension or the original model name. Relevant checks include shank diameter, holder condition, washer configuration, installed projection, carbide-tip geometry, and the material being milled.

What Are HUB-05A and HUZ-05A?

Both KOIHO models are road milling picks designed for asphalt milling and stabilizing applications and are shown with a 20 mm shank.

• HUB-05A uses a classic steel body with a 19 mm flat-bottom reinforced carbide tip. Its stated weight is 308 g per pick.

• HUZ-05A uses a comprehensive steel body with a 19 mm cap-shaped carbide tip. Its stated weight is 350 g per pick.

These products offer two different cutting-tool configurations within the same 20 mm-shank family. This gives contractors and distributors a choice based on their holder system and milling application rather than forcing every W7 replacement requirement into one identical design.

Why “Replacement” Does Not Always Mean “Identical”

A road milling pick is part of a working system that includes the milling drum, toolholder, washer, retaining components, machine setup, and pavement material. A replacement pick therefore does not need to match every visual feature or every isolated dimension of the original part to be useful in a Wirtgen W7-type application.

A practical alternative must first meet the critical fitment requirements. It should seat correctly in the holder, maintain suitable clearance and projection, and use a carbide-tip design appropriate for the milling task. After that, the selection should consider wear behavior, impact loading, aggregate type, milling depth, and the contractor’s operating preferences.

For this reason, KOIHO HUB-05A and HUZ-05A should be evaluated as application-based alternatives, not merely as copies of an original part.

HUB-05A for Asphalt Milling

HUB-05A combines a classic steel body with a 19 mm flat-bottom reinforced carbide tip and a 20 mm shank. The product information recommends it for asphalt and stabilizing applications.

The flat-bottom tip configuration can be relevant for contractors seeking a pick intended for asphalt-layer milling. Its geometry is designed around the cutting and material-flow requirements of this type of work, while the reinforced tip design provides an additional option within KOIHO’s flat-bottom carbide range.

HUB-05A may be an appropriate choice when the existing W7-type holder system accepts the 20 mm shank configuration and the job calls for a flat-bottom tip style.

HUZ-05A for More Diverse Milling Conditions

HUZ-05A uses a 19 mm cap-shaped carbide tip, a comprehensive steel body, and a 20 mm shank. It is also listed for asphalt and stabilizing applications.

A cap-shaped carbide-tip design may be considered where the contractor prefers this cutting profile for a particular combination of asphalt condition, stabilization work, impact loading, or operating practice. The HUZ-05A is therefore not simply another version of HUB-05A; it provides a different carbide-tip and steel-body configuration for the same general 20 mm-shank tool family.

HUB-05A vs. HUZ-05A

Compatibility Checklist for W7-Type Applications

Before selecting HUB-05A or HUZ-05A as a Wirtgen W7 alternative, confirm the following:

• Toolholder bore: Verify that the system is designed for a 20 mm shank.

• Washer and holder interface: Check washer thickness, outside diameter, sleeve arrangement, and the condition of the holder face.

• Installed projection: Compare pick length and installed cutting position with the existing drum setup.

• Carbide-tip preference: Select a flat-bottom reinforced tip or cap-shaped tip based on pavement material and expected operating load.

• Original reference: Share the original W7 part number, machine model, drum type, and clear photos of the used pick and holder.

• Field conditions: Consider asphalt hardness, aggregate abrasiveness, milling depth, water supply, and tooth rotation.

Which Model Should You Choose?

Choose HUB-05A when your W7-type application requires a compatible 20 mm-shank pick and a flat-bottom reinforced carbide-tip configuration is preferred for the asphalt-milling task.

Choose HUZ-05A when the same 20 mm-shank interface is required but a cap-shaped carbide-tip configuration and comprehensive steel body are more suitable for the operating conditions.

If the original pick is heavily worn, damaged, or incomplete, do not select a replacement only by its external appearance. Measure the shank, washer, overall projection, and holder bore, then send this information to KOIHO for application-based selection support.

Frequently Asked Questions

Can HUB-05A and HUZ-05A replace Wirtgen W7 picks?

They can be evaluated as alternatives for Wirtgen W7-type applications when their 20 mm shank, holder fit, installed geometry, and selected tip design are appropriate for the machine and jobsite.

Must a KOIHO replacement have exactly the same parameters as the original W7 pick?

No. A suitable replacement should meet the critical installation and application requirements. Exact duplication of every non-critical design detail is not always necessary for a pick to perform effectively in a compatible milling system.

What is the main difference between HUB-05A and HUZ-05A?

HUB-05A has a classic steel body and a 19 mm flat-bottom reinforced carbide tip, while HUZ-05A has a comprehensive steel body and a 19 mm cap-shaped carbide tip. Both use a 20 mm shank and are listed for asphalt and stabilizing.

Which pick is better for asphalt milling?

Neither model should be described as universally better. Both are listed for asphalt and stabilizing; the suitable choice depends on the holder system, tip preference, pavement condition, and project requirements.

What details should I provide for a replacement recommendation?

Provide the original W7 reference or part number, machine and drum model, holder photo, old-pick photo, shank diameter, washer dimensions, and the material being milled.

Request a W7 Replacement Check

KOIHO Better Carbide provides road milling picks for asphalt milling and stabilizing, including the HUB-05A and HUZ-05A 20 mm-shank configurations. For a practical Wirtgen W7-type replacement recommendation, send your original tool details and application information for compatibility review.