Details
Brand
Boride
Form Factor
6" Single Sided Edge Pro
Backing
Anodized aluminum blank compatible with Edge Pro
Abrasive
Aluminum oxide
Grit Rating 📊:
Extra Coarse Coarse Medium Fine Extra Fine
Set Composition:
8 items
Grit Scale:
F Grit (FEPA-F)
Description

Boride sharpening stones are used for sharpening knives on Edge Pro sharpeners. Boride offers a wide range of stones with different performance values and different rates of wear. Boride T2 series stones are made of aluminum oxide. All Boride stones are 6mm thick and are mounted on high-quality aluminum blanks. Stones that are 6mm thick offer a longer life cycle than stock Edge Pro stones that are 3mm thick and are becoming a community standard.

Boride stone set comparison

T2
5 stones
T2 150
T2 220
T2 400
T2 800
T2 1200
Aluminum Oxide
Wear-resistant series for all steels.
CS-HD
5 stones
CS-HD 150
CS-HD 220
CS-HD 400
CS-HD 800
CS-HD 1200
Silicon Carbide
High-performance series for hard steels (60-65 hRC).
Full T2
8 stones
T2 150
T2 220
T2 320
T2 400
T2 600
T2 800
T2 1000
T2 1200
Aluminum Oxide
Wear-resistant series for all steels.
Full CS-HD
9 stones
CS-HD 120
CS-HD 150
CS-HD 220
CS-HD 320
CS-HD 400
CS-HD 600
CS-HD 800
CS-HD 1000
CS-HD 1200
Silicon Carbide
High-performance series for hard steels (60-65 hRC).

How to use

Boride stones should be used with one of these lubricants:

  • Water
  • Soapy water
  • Boride Bori-Lube
  • Water solution of dipropylene glycol
  • WD-40 (for experienced users only)
  • Refined olive oil (for experienced users only)
  • Oleic aсid (for experienced users only)

In case of using the water as lubricant, soak the stone in water for 1-2 minutes. In case of using the oil, put a small amount (1-2 drops) of honing oil on the stone’s surface and spread it evenly over the stone with a finger. If the stone absorbs the honing oil, use larger amount of oil.

Boride Stones may have the following minor defects:

  • Saw strokes on the work surface
  • Residues of lacquer
  • Small chips at the corners and along the edges (no larger than 1mm)

All these defects will be eliminated during preparation of the stone. The majority of sharpening stones requires preparation, and Boride stones are no exception. Additional lapping can be performed by customer to improve sharpening quality. We recommend to use loose silicon carbide powder or diamond lapping plate.

FAQ

  • What is the difference between Boride and stock Edge Pro stones?

    There is no difference. Edge Pro stones are Boride 150 x 25 x 3mm (6" x 1" x ⅛") branded as Edge Pro. Boride offers a wide variety of series and sizes, while Edge Pro offers a limited assortment. We buy sharpening stones from Boride and mount the stones to blanks. That's exactly what Edge Pro company does. The difference is we keep the names of the original sharpening stones in the names of the finished products.

  • Can I use Boride stones and stock Edge Pro stones simultaneously?

    Yes, but you must use a thickness compensator because stock Edge Pro stones are 3mm thick, while the Boride stones we offer are 6mm thick. It's highly recommended to own a thickness compensator because the ability to use sharpening stones of different thicknesses allows for a high level of flexibility.

  • What if I buy Boride stones 3mm thick to keep all my collection uniform?

    This is possible but not recommended as a long-term solution. The 6mm thickness is becoming a community standard for Edge Pro sharpening stones. If you keep your entire collection 3mm thick, you will not be able to use many good stones. You will also have to purchase 3mm stones more often than 6mm stones due to their shorter life cycle.

  • Can I buy one CS-HD and use it to sharpen all my knives? If it's okay for hard steel, it should be even better for soft steel, right?

    No, we do not recommend this. CS-HD will wear extremely fast when used on soft steel, making CS-HD uneconomical for this kind of steel. If you own knives of both hard and soft steel, consider buying 2 sets of stones.

  • Can I buy a sharpening stone without a blank?

    Yes, Boride T2 and CS-HD are available without blanks. Check the area "Freehand - All-purpose stones".

  • What are the pros and cons of 6mm and 3mm thicknesses for sharpening stones?

    All stones wear as they are used and thicker stones have longer life cycles as a result. However, it's easier to use thinner stones on Edge Pro sharpeners because of their lower weight. The 6mm thickness offers a perfect balance between life cycle and weight, and has become the community standard for Edge Pro format sharpening stones When made of hard material, 3mm stones are good as ultra-fine sharpening stones, for example alumina ceramic or natural stones.

Boride Series
Boride Series Abrasive Bond / Structure Cutting Speed Wear Resistance Loading / Glazing Resistance Scratch Character Best Steel Range Lubricant Preference Best Use in Progression Main Strength Main Weakness
CS-HD Silicon Carbide Hard vitrified coarse-cut SiC Very High Medium Good Deep, aggressive, harsh Hard wear-resistant steels Water / Dry Heavy reprofiling Fastest Boride stock removal Rough finish, harsh feedback
CS-WX Silicon Carbide Waterstone-like refined SiC bond High Medium Very good Cleaner and shallower than CS-HD High-carbide steels, hard stainless Water Coarse-to-medium difficult steel sharpening SiC speed with smoother finish Still wears faster than premium AlOx
Ruby Friable Aluminum Oxide Fast releasing open bond High Medium-low Excellent Toothy, lively Simple/tough steels Water Fast bevel establishment Very responsive cutter Dishes relatively fast
T2 Premium Aluminum Oxide Premium vitrified universal bond High High Very good Clean and even Universal Water Main sharpening workhorse Best all-around Boride Not as aggressive as SiC on monster steels
Golden Star Premium Aluminum Oxide Refined premium bond High High Very good Slightly smoother than T2 Universal Water Mid/fine sharpening Excellent feedback Less common grit availability
PC Premium Aluminum Oxide Dense finishing vitrified bond Medium High Good Bright semi-polishing Medium-hard and hard steels Water Pre-finish / finish Best conventional Boride finisher Too slow for shaping
AS-9 Aluminum Oxide Dense oil-oriented vitrified Medium-low Very high Moderate Smooth bright Simple steels Oil preferred Slow stable finish Long life Sluggish on water guided use
AM-K Aluminum Oxide Economy vitrified Medium Medium-high Average Basic utilitarian Soft-medium steels Water Budget intermediate Affordable filler No premium traits

Oil Behavior

Tag Short Definition
oil-retentive Retains a stable working oil film on the stone surface
oil-wicking Pulls oil into the stone body and dries the surface quickly

Oil Behavior describes how a sharpening stone interacts with oil during use. The property is especially important for vitrified and resin-bonded stones because oil can either remain on the working surface or be absorbed into the stone body. Oil behavior affects sharpening feel, swarf evacuation, loading tendency, maintenance, and long-term stone cleanliness.

Oil-retentive stones keep a stable lubricating film on the surface during sharpening. This improves swarf mobility, reduces surface drying, and creates a smoother, more consistent sharpening feel. Oil-retentive stones are suitable for long-term use with honing oil.

Oil-wicking stones rapidly absorb oil into the internal structure through capillary action. The working surface dries quickly, swarf removal becomes less efficient, and oil contamination may become difficult or impossible to remove completely. Oil-wicking stones are generally better suited for water-based sharpening.

Customer Reviews
Grand Logarithmic Grit Chart
Questions and Answers