Knives & Prep review
Mac MTH-80 Review: The Sharpest Knife, and a Hardness Dispute
Reviewers keep calling it the sharpest knife they have used. One lab put it on a hardness tester and got a number seven points below what Mac claims.
By Paulo GerchonPublished 2 min read
Illustration, not a photo — we don’t have a licensed image of this product yet.
Mac
Mac Professional Series MTH-80
Good · researched from 4 sources
If you already cook carefully and hand-dry your knives, nothing here cuts better. Buy it for precision rather than as a general-purpose knife, and be aware that the one lab that measured its hardness did not get the number on the box.
- Buy if
- Confident cooks who already maintain their knives properly · Precision work, fine slicing and vegetable prep · Anyone willing to learn whetstone sharpening
- Skip if
- Households where the knife gets left wet in the sink · Cooks with larger hands, given the short handle · Anyone who wants one knife that also handles bones and frozen food
We don’t list prices, because Amazon’s change hourly.
The hardness number does not add up
Mac says 60 HRC. Prudent Reviews reports 59. TechGearLab put the blade on a hardness tester and measured 53.
Seven points is not a rounding error. It is the difference between a hard Japanese blade and something closer to a good European one. TechGearLab also measured the edge at 25 degrees where Mac claims 15.
We cannot resolve this from the outside, and it is worth being clear that it does not appear to hurt the knife. A slightly softer, slightly more obtuse edge is more durable, easier to sharpen and less likely to chip, which happens to match what reviewers report in use. But if you are buying on the specification, one lab that measured it did not find the specification.
It cuts better than almost anything
None of that disagreement touches the part everyone agrees on.
TechGearLab scored cutting performance 9.5 and their reviewer described it as the sharpest knife they had ever used. They rated the factory edge at 187 BESS, which is very keen for a knife straight out of a box. Forbes found it passing the paper test cleanly, without catching or tearing.
The reason is geometry as much as sharpness. TechGearLab measured the spine at 2.10 mm, which is thin, and a thin blade parts food instead of wedging it apart. Combined with about 181 g of weight and a central balance, the knife does fine work with very little effort.
The handle is the real complaint
Prudent Reviews measures it at roughly 4.5 inches and lists it as a downside. TechGearLab reached the same conclusion independently, finding it awkward for larger hands and when working through big ingredients.
This is not a small thing on a knife you will hold for an hour at a time. It is also the most personal variable here, so hold one if there is any way to.
What it asks of you
Hand wash it and dry it straight away. Forbes is explicit about acidic ingredients, and Prudent Reviews warns the high carbon content leaves it open to staining and rust.
Keep it off bones, frozen food and hard squash, which is Mac's own guidance. Prudent describes the edge as prone to chipping with improper use, which is the cost of the geometry that makes it cut so well.
TechGearLab adds a warning that reads oddly until you use a knife this sharp: it is genuinely hazardous for inexperienced cooks, because the edge bites before you expect it to.
None of that is unreasonable for a knife of this type. It does mean this is a second knife in most kitchens rather than the only one.
How it scored
The overall 8.0 is the weighted average of these five criteria — we never adjust it by hand.
Cutting performance
TechGearLab scored cutting 9.5, rated the factory edge at 187 BESS and called it the sharpest knife their reviewer had used. Forbes found it sliced paper without catching.
Value
Every source raises the price. TechGearLab still put it third of thirteen and Forbes ranked it best overall of ten.
Build quality
Seki City made with a Pakkawood handle, but the thin high-carbon blade is the fragile kind. Forbes and Prudent Reviews both flag chipping and staining risk.
Ease of use
Light at about 181 g, but TechGearLab and Prudent Reviews both criticise the short handle, which Prudent measures at 4.5 inches.
Edge retention
TechGearLab reports it holding through months of intensive use. Prudent Reviews puts the sub-zero tempered steel at up to eight weeks between sharpenings.
Pros and cons
What we liked
- TechGearLab's reviewer called it the sharpest knife they had ever used
- Thin at the spine, so it parts food rather than wedging it apart
- Light and centrally balanced, which suits precision work
- Edge retention that survived months of intensive testing at TechGearLab
- Made in Seki City with a triple-riveted Pakkawood handle
What we didn’t
- TechGearLab measured 53 HRC where Mac claims 60, and 25 degrees at the edge where 15 is claimed
- Both TechGearLab and Prudent Reviews find the handle too short, especially for larger hands
- High-carbon steel that Forbes and Prudent both warn will stain or rust if left wet
- Mac advises against bones, frozen food and hard squash, so it is not a one-knife kitchen
- TechGearLab notes the extreme edge is genuinely hazardous for inexperienced cooks
Specifications
| Blade length | 8 in |
|---|---|
| Steel | Molybdenum high-carbon; sub-zero tempered on the Professional series per Prudent Reviews |
| Hardness | 60 HRC claimed; 59 HRC per Prudent Reviews; 53 HRC measured by TechGearLab |
| Edge angle | 15 degrees per side claimed; 25 degrees measured by TechGearLab |
| Spine thickness | 2.10 mm per TechGearLab; up to 2.5 mm per Forbes |
| Weight | 181 g, 6.4 oz per TechGearLab; 6.5 oz per Forbes |
| Handle | Pakkawood, triple riveted, about 4.5 in per Prudent Reviews |
| Factory sharpness | 187 BESS per TechGearLab |
| Made in | Seki City, Japan |
How we researched this
We have not had this unit on the bench. This review synthesises the manufacturer’s published specifications, independent measurements and owner reports listed below. Every figure on this page comes from one of those sources rather than our own measurement.
4
sources reviewed
TechGearLab is the only source that measured the knife rather than repeating its specification, and supplies the hardness, edge angle, spine thickness, weight and BESS sharpness figures along with their category scores. Prudent Reviews contributed the handle measurement, the steel description and the sharpening interval. Forbes covered ordinary kitchen use and the maintenance requirements. Because TechGearLab's measured hardness and edge angle differ substantially from both Mac's claim and Prudent Reviews' figure, the specification table lists all three rather than choosing one.
What we read
Common questions
How hard is the Mac MTH-80 steel really?
Is the handle too small?
Will it rust?
Can I use it for everything?
What do the dimples on the blade do?
The bottom line on the Mac Professional Series MTH-80
If you already cook carefully and hand-dry your knives, nothing here cuts better. Buy it for precision rather than as a general-purpose knife, and be aware that the one lab that measured its hardness did not get the number on the box.
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