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Grand Logarithmic Grit Chart

Knife Sharpeners and Stone Formats Compatibility Chart

Venev Celectial Family

Hapstone K1 Knife Sharpener

HAPSTONE-K1D-BASIC

Stone bundle
 
#
Number of stones in the stone set or the sharpener bundle ,
# * 2
means dual-sided stone with different grits ,
# + 1
means one stone out of the main series .

Description

Hapstone K1 Precision Knife Sharpener is the new premium segment knife sharpener from Hapstone, the supplier of successful Hapstone V7 and Hapstone M2. Based on the cutting-edge rotating clamp technology, Hapstone K1 delivers high precision of knife sharpening and ease of use to knife sharpening enthusiasts. 

Features

  • Rotating dual clamp system
  • Upgradable to triple clamp configuration
  • CNC milled superelastic duralumin alloy jaws
  • Compact design and mobility 
  • Pivot unit with the 360° rotation
  • Universal stone holder
  • Full compatibility with Edge Pro and KME format stones
  • Suitable for sharpening stones up to 6 inches (160 mm)
  • Any sharpening angle in a range from 14° to 28° degrees (*)
  • All basic parts including thumbs are made of metal
  • Light-alloy horizontal shaft for better pressure control during the sharpening process
  • Fast assembly
  • Parking hook for horizontal shaft
  • Metal pivot unit with PTFE insert provides smooth shaft movement and requires no lubrication or cleaning
  • Wooden handle to make time-consuming work a little easier
  • Suitable for both desktop work and clamping to a table
  • Max blade length 9.85", max thickness 0.2"
  • Rubber coated supporting legs that can be used on any surface

* The sharpening angle range varies between different blades.

Warranty

The manufacturer provides the 5-year warranty on Hapstone K1 knife sharpeners. You can be sure of the reliability of the devices and support from the manufacturer for the entire period of use.

Gritomatic handles warranty support for Hapstone sharpeners in the USA.

Stone bundles

You can purchase a Hapstone K1 in a bundle with one of our stone sets. If you already have a collection of sharpening stones, or if you plan to purchase stones of your choice in the future, choose the Basic bundle.

Each of the recommended stone bundles includes stones with evenly incremented grit (grain size). You can check our recommendation, depending on the steel hardness of your knives.

Basic

Hapstone 220
Hapstone 400
Hapstone 1200
Simple silicon carbide stones for learning knife sharpening and familiarizing with the sharpener. All stones are mounted on blanks and are easy to use. For all steels. To be used with water.
Venev Dog
Venev 4" Dog Series Dual Side Diamond Set Venev Industrial Diamonds $17.00 USD

(Procyon Stone Set)
Venev Diamond 100 + 240
Venev Diamond 400 OCB + 800 OCB
Inexpensive but powerful diamond set. 4" resin-bonded dual-sided diamonds. Four grits 100 to 800 FEPA. For all steels. To be used with water.
Venev Centaur
Venev 6" x 1" Centaur Series Dual Side Diamond Set Venev Industrial Diamonds from $100.00 USD

(3Centauri Stone Set)
Venev Diamond 80 + 150 (100%)
Venev Diamond 240 + 400 OCB (25%)
Venev Diamond 800 OCB + 1200 OCB (25%)
Mid range diamond set for all users. 6" resin-bonded dual-sided diamonds. Six grits 80 to 1200 FEPA. For all steels. To be used with water.
Venev Orion
Venev Orion Series Diamond Set for Edge Pro Venev Industrial Diamonds from $200.00 USD

(Rigel Stone Set)
Orion 80 (100%)
Orion 150 (100%)
Orion 240 (100%)
Orion 400 (OCB 25%)
Orion 800 (OCB 25%)
Orion 1200 (OCB 25%)
Premium resin-bonded diamond set. All diamonds are mounted on aluminum blanks and easy to use. To be used with water.
Silicon Carbide

Gritomatic Silicon Carbide 120
Gritomatic Silicon Carbide 240
Gritomatic Silicon Carbide 600
Gritomatic Silicon Carbide 1000
Gritomatic Silicon Carbide 2500
Silicon carbide stone set for hard steels (over 58 hRC). All stones are pre-lapped, mounted on aluminum blanks, and easy to use. To be used with water.
Boride
Boride Stone Set for Edge Pro Boride from $55.00 USD

Boride T2 150
Boride T2 220
Boride T2 400
Boride T2 800
Boride T2 1200
Hard bonding aluminum oxide stone set for experienced users. For all steels. Can be used with water or oil.
Chosera

Gritomatic Silicon Carbide 120
Chosera 400
Chosera 1000
Chosera 3000
Chosera 10000
Premium japanese stone set for all steels. Includes complimentary 120 grit silicon carbide stone. All stones are pre-lapped, mounted on aluminum blanks, and easy to use. To be used with water.
Shapton Pro

Shapton Pro 120
Shapton Pro 320
Shapton Pro 1000
Shapton Pro 2000
Shapton Pro 5000
Shapton Pro 12000
Premium japanese stone set for all steels. All stones are pre-lapped, mounted on aluminum blanks, and easy to use. To be used with water.
Matrix


Edge Pro Matrix 80
Edge Pro Matrix 250
Edge Pro Matrix 650
Edge Pro Matrix 1100
Edge Pro Matrix 2300
Edge Pro Matrix 4000

Premium resin-bonded diamond set. All diamonds are mounted on aluminum blanks and easy to use. To be used with water.

Hints

Here is a brief guideline for stone bundle choosing.

  • Do you own a sharpening stone collection compatible with Hapstone? Choose Basic Bundle.
  • You have EDC / Hunting / Tactical / Traditional Japanese knives made of powder steel (ZDP-189, ZDP-247, S30V, S35VN, S90V, S110V, 154CM, D2, YXR7, Cowry, S290, S390, K294, K390, M390, Elmax) or traditional hard steels (154CPM, ATS-34, 440C, AUS-8, AUS-10, A2, BG-42)? Choose Silicon Carbide Bundle.
  • You have Kitchen / EDC knives made of soft carbon or stainless steel (1095, 1080, 1070, 1050, 420, 440A, 440B, 3Cr13, 8Cr13MoV, 8Cr14MoV, 9Cr14MoV, AUS-4, AUS-6)? Choose Aluminum Oxide Bundle or Boride Bundle.
  • Diamonds have substantial advantages to traditional abrasives: they are universal, can be used dry, and have a long life. Unfortunately, there are disadvantages too: microchipping and deep scratching (especially on powder steels), weaker feedback. It's recommended to flatten and lap diamonds, so we don't recommend diamond bundle to inexperienced users. If you consider it a good compromise, choose Diamond Bundle.

Hapstone Series Comparison

Hapstone R1
Stones up to 210 mm
Sharpening Angles from 9° to 33° (*)
Target Precision 0.1°
Auto-Adjustable Universal Stone Holder 
Rotating Triple Clamp System
Stainless Steel Jaws with Flat Springs
Linear Ball Bearing Pivot Unit
Pivot Unit with Full 360° Rotation
Spring Assisted Stopper Rings
Fine-Tuning Adapter
Option: Scissors Module (**)
Option: Chisel Module (**)
Option: Extendable Table Module (**)
Option: Convex Rod
Max blade length 19", max thickness 0.25"
5-years Warranty
Hapstone K1
Stones up to 160 mm
Sharpening Angles from 14° to 28°
Target Precision 0.1°
Universal Stone Holder
Upgradeable Dual Rotating Clamp System
CNC Milled Duralumin Jaws
PTFE Pivot Unit
Pivot Unit with 360° Rotation
Option: Spring Assisted Stopper Rings
No Fine-Tuning Adapter
No scissors support
No chisel support
No three-point guide
No convex support
Max blade length 9.85", max thickness 0.2"
5-years Warranty
Hapstone V7
Stones up to 210 mm
Sharpening Angles from 11° to 47°
Target Precision 0.1°
Auto-Adjustable Universal Stone Holder 
Discontinued Option: Rotating Clamp System
No clamping
PTFE Pivot Unit
Pivot Unit with 120° Rotation
Spring Assisted Stopper Rings
Option: Fine-Tuning Adapter
No scissors support
No chisel support
Standard Three-Point Guide
Option: Convex Rod
No max blade length, no max thickness
5-years Warranty
 

* The sharpening angle range varies between different blades and sharpening modules:
15° - 33° for narrow blades with the rotating clamp system.
9° - 32 ° for wide blades with the rotating clamp system.
9° - 41° with the extendable table module.

How to use Hapstone K1 Sharpener

Hapstone K1 knife sharpener is shipped disassembled and requires assembling.

Attention! There is no printed User's Guide. PDF version will be available soon.

How to use bundled stones

Basic

Basic stones are made of silicon carbide. Water is required to use. Immerse all stones in water for 10 minutes before use and keep them wet during the work. Do not keep the stones in water for a long time.

Silicon Carbide

Bundled stones are made of silicon carbide. Water is required to use. Immerse all stones in water for 10 minutes before use and keep them wet during the work. Do not keep the stones in water for a long time.

Stone set is optimized for sharpening knives made of hard steels. You can use 120 and 240 grit stones on soft steel knives. Using 600, 1000 and 2500 grit stones with steels with hardness less than 58 hRC is not recommended.

Aluminum Oxide and Boride

Bundled stones are made of aluminum oxide. Water is required to use. Immerse all stones in water for 10 minutes before use and keep them wet during the work. Do not keep the stones in water for a long time.

Stone set is optimized for sharpening knives made of soft steels. Using the stones with steels with hardness more than 59 hRC is not recommended.

Diamond

Bundled diamonds are dual-sided, one side is coarser than others. Three stones have a total of six grits. It is a little bit tricky to identify grits. You can find identification marks on the side face. The mark is grit specified in FEPA-F scale with arrow symbol facing to the corresponding surface. A finer side is always copper colored.

All diamonds are bonded, not coated. It means you can clean, refresh, flatten and lap your diamonds like any other synthetic stone.

It's recommended to use water as a lubricant to prevent stone loading.

Information for Wicked Edge users

Do you have Wicked Edge knife sharpening system and a large collection of stones? Migrating to Hapstone or owning multiple sharpening systems will be very easy for you. With the Guide Rod, you can use all your Wicked Edge stones and paddles with Hapstone knife sharpener. Wicked Edge owners will get FREE Guide Rod when purchasing Hapstone knife sharpener on Gritomatic. The time you make an order, send us a photo of your Wicked Edge unit with a paper sheet with the current date.

Questions and answers

If you have a question regarding this product, please feel free to ask.

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