Description

Hapstone Modular Platform

Maximum configuration. Ready from the start.

Hapstone R2 Ultra is the most complete configuration in the R2 family, combining two clamp types, precise angle adjustment, convex sharpening capability, thickness compensation, and a dedicated storage case in one fully equipped system.

Maximum setup

The most complete R2 configuration.

Hapstone R2 Ultra is the flagship configuration of the R2 family. It brings together the core platform and the most important add-ons in one package, so the system is fully equipped from day one.

Versatility

Two clamp types. Wider knife coverage.

With Universal Angled Clamps for everyday knives and Whole Milled Angled Clamps for fillet and hunting knives, the R2 Ultra is built to handle a broader variety of blade shapes and sharpening tasks.

Precision

Fine angle control built in.

The included Precise Angle Adjuster allows smooth and accurate micro-adjustments of the sharpening angle. It gives the system a more controlled feel in use and makes fine angle tuning easy and repeatable.

Precise Angle Adjuster for Hapstone R2 Ultra

Whole Milled Angled Clamps for Hapstone R2 Ultra

Whole milled clamps

Made for narrow and flexible blades.

Whole Milled Angled (Fillet) Clamps are especially well suited for fillet knives and hunting knives. Their rigid one-piece construction provides stable blade holding and a confident feel during sharpening.

Universal Angled Clamps for Hapstone R2 Ultra

Universal clamps

Flexible for everyday knives.

Universal Angled Clamps are designed for the widest range of common knife types. They offer flexible positioning and make the system more adaptable across different blade lengths, profiles, and geometries.

Why R2 Ultra

Monumental. Ergonomic. Easy to use.

Hapstone R2 Ultra combines a solid mechanical platform with thoughtful ergonomics and simple operation. It is built for users who want the fullest possible configuration without having to assemble it step by step later.

Maximum versatility

Two clamp styles are included in one package for broader compatibility with different knives.

Better control

The Precise Angle Adjuster allows smooth and accurate micro-adjustments during sharpening.

Expanded capability

Includes both the Convex Adapter and Thickness Compensator as part of the standard configuration.

Ready now

This is the most complete R2 system here and now, with no immediate add-ons required.

Storage

Case included in the package.

The included Case for Hapstone R2 keeps the system protected and organized during storage and transport. It is part of what makes the R2 Ultra the most complete configuration in the family.

Clamp comparison

Universal vs Whole Milled

Universal Angled Clamps	Designed for the widest range of everyday knives. They offer flexible positioning and adapt well to different blade lengths, shapes, and common sharpening tasks.
Whole Milled Angled Clamps	Built with rigid one-piece construction and especially well suited for fillet knives, hunting knives, and other narrow or flexible blades where stable clamping is especially important.
Why both matter	Including both clamp styles in one package gives Hapstone R2 Ultra broader real-world versatility and lets you choose the best clamping solution for each knife.

Convex adapter

Convex sharpening included.

The Convex Adapter for Hapstone (Gen 2) expands the system’s capability and allows convex edge geometry without needing to buy an additional module separately.

Thickness compensator

Stable angle across different stones.

The Thickness Compensator helps maintain a more consistent sharpening angle when switching between stones of different thickness.

What’s included

Complete kit. Fully equipped platform.

Hapstone R2 Ultra includes the R2 platform together with two clamp styles, precise angle adjustment, convex capability, thickness compensation, storage case, and essential accessories — making it the most complete configuration in the family.

Base & Rods

1 Platform base
1 Horizontal guide rod
1 Lightweight alloy guide rod with wooden handle

Rotation

Rotating clamp module
Adjustable flipping strength

Clamps

1 pair of Universal Angled Clamps for Hapstone R2
1 pair of Whole Milled Angled (Fillet) Clamps for Hapstone R2

Fine Adjustment

1 Precise Angle Adjuster for Hapstone
1 Thickness Compensator for Precise Angle Adjuster

Adapters & Accessories

1 Convex Adapter for Hapstone (Gen 2)
1 Digital Angle Gauge Hapstone
1 Ball-End Hex Screwdriver 4 mm “Fire Orange” for Hapstone R2
1 Stopper ring
1 Spring-assisted stopper ring

Storage

1 Case for Hapstone R2

Video

See it in action

Watch the video to see how this product works in real sharpening use.

Technical details

Specifications

System	Hapstone R2 Ultra
Platform	Hapstone Modular Platform
Clamp Module	Rotating clamp module with adjustable flipping strength
Included Clamps	Universal Angled Clamps for Hapstone R2 (2 pcs) Whole Milled Angled (Fillet) Clamps for Hapstone R2 (2 pcs)
Included Modules	Precise Angle Adjuster Convex Adapter for Hapstone (Gen 2) Thickness Compensator for Precise Angle Adjuster
Sharpening Angle Range	10° to 40° per side*
Blade Capacity	Up to 320 mm long and up to 8 mm thick
Stone Compatibility	6" (160 mm) stones, Edge Pro & KME formats
Pivot Type	Linear ball-bearing pivot, no lubrication needed
Guide Rod	Lightweight alloy guide rod with wooden handle
Case	Included
Sharpening Stones	Not included
Warranty	5 years

Note: Sharpening stones are not included. Please select compatible stones using the product options above.

Specifications
Dimensions (L x W x H)	11"х5.5"х7.4" (280 х 143 х 188 mm)
Weight	11 lbs (5000 g)
The size of the stone	6" x 1" (150 x 25 mm) / 4" x 1" (100 x 25 mm)