What Diamond Machining Technology (DMT) does

Diamond Machining Technology (DMT) is a US manufacturer of manual diamond sharpening tools, founded in 1976 and headquartered in Marlborough, Massachusetts. The company designs and produces a comprehensive portfolio of diamond sharpeners organized around three core surface technologies: the signature interrupted polka-dot pattern (Diamond Whetstone), continuous diamond surfaces (Dia-Sharp), and the proprietary Hardcoat diamond surface for ceramic and high-wear applications. The product portfolio spans bench stones, portable and pocket sharpeners, guided sharpening systems, countertop sharpeners, sharpening steels, lapping plates, and specialty items (Flexi-Sharp sheets, Dia-Paste compounds, Crystal Saver, Diamond Wave). Multiple product families — DuoSharp, Diafold, Dia-Flat, Aligner, Mini-Sharp, Burr Doctor — hold registered patents.

The business model is a single revenue stream: one-time hardware sales of physical sharpening products at price points ranging from $12.99 (entry-level countertop consumer sharpeners) to $246.99 (precision industrial lapping plates). DMT does not sell software, subscriptions, consumables at scale, or services. Distribution is multi-channel and long-tail: the company sells through its own direct-to-consumer online store (dmtonlinestore.com), Amazon, major US hardware chains (Ace, True Value, Do It Best), specialty tool distributors (Rockler, Lie-Nielsen, Highland Woodworking, McMaster-Carr, Grainger), cutlery retailers, sport/outdoor stores, and an international dealer network spanning 14 countries. DMT operates as a wholly-owned subsidiary brand of Acme United Corporation (NYSE: ACU), a diversified consumer products company also housing First Aid Only, PhysiciansCare, Westcott, Clauss, and Spill Magic.

Customer segmentation is vertical-driven and spans six end markets: Woodworking & DIY, Home (kitchen knives), Professional & Food Processing/Service, Outdoor Sports, Winter Sports, and Landscaping/Floral/Hydro. The professional and food-service segment plus the woodworking segment are the highest-value primary segments, while home/consumer and outdoor/winter sports are secondary volume segments. No discrete revenue figure, headcount, or growth rate is disclosed in public materials; product activity between 2023 and mid-2025 shows continued SKU expansion, particularly a new EdgeSharp countertop sharpener family targeting entry-level home consumers.

Name

Diamond Machining Technology (DMT)

Legal name

Diamond Machining Technology (DMT)

Website

https://dmtsharp.com

Company type

Private

Founded year

1976

Operating status

Operating

Short description

Diamond Machining Technology (DMT) manufactures manual diamond sharpening tools — bench stones, portable and pocket sharpeners, countertop sharpeners, and lapping plates — for woodworking, culinary, professional food service, outdoor sports, winter sports, and landscaping end markets, selling through US hardware chains, specialty distributors, an international dealer network, and its own online store as a subsidiary brand of Acme United Corporation.

Ownership category

akta.pro rank

Headquarters

HQ city

Marlborough

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Diamond Sharpening Products: DMT generates revenue through the sale of manual diamond sharpening products including bench stones, portable sharpeners, pocket sharpeners, guided sharpening systems, countertop sharpeners, sharpening steels, lapping plates, and specialty products. Products are sold through distribution partners (retailers, hardware chains, specialty stores) and directly through the company's online store. Revenue is primarily one-time product purchases with products designed to last many years.

Pricing tiers

Go-to-market motion1 record

Distribution channels8 records

Marketing channels6 records

Core offering

DMT manufactures and sells manual diamond sharpening products for knives, tools, and industrial edges. The portfolio includes bench stones (Diamond Whetstone, DuoSharp, Dia-Sharp), portable and pocket sharpeners (Diafold, Mini-Sharp), guided sharpening systems (Aligner, Magna-Guide), countertop sharpeners (EdgeSharp, SimpleSharp, Tri-Stone), sharpening steels (Diamond Steel, Ceramic Edge), lapping plates (Dia-Flat), and specialty items (Crystal Saver, Flexi-Sharp, Diamond Wave). Products use proprietary micronized monocrystalline diamond abrasive surfaces.

Product overview

DMT (Diamond Machining Technology) is the leading innovator of manual diamond sharpening technology since 1976, offering a comprehensive portfolio of diamond sharpening products. The core product lines include three bench stone types: Diamond Whetstone™ (signature interrupted polka-dot surface), DuoSharp® (multi-patented double-sided bench stones), and Dia-Sharp® (continuous surface stones). Portable sharpening is delivered through the Diafold® family including double-sided, single-sided, serrated knife, flat file, and chain saw sharpeners. Pocket-sized options include Mini-Sharp®, Diamond Whetstone™ Models, Dia-Sharp® Models, and the Burr Doctor®. Guided sharpening systems include the Aligner™ Easy Edge-Guided System and Diafold® Magna-Guide® Kit. Countertop sharpeners comprise the EdgeSharp line (SharpAdjust, EverSharp, DiamondBench Pro, Pizza Wheel) and SimpleSharp and Tri-Stone Rotator models. Sharpening steels include Diamond Steel™ and Ceramic Edge options. Lapping products feature the Dia-Flat® Lapping Plates in standard and 95-micron versions. Specialty products include Crystal Saver®, Flexi-Sharp® Sheets, Dia-Paste™ and DiaSpray™ compounds, Diamond Wave™ and Honing Cones, and Hardcoat™ Surface Sharpeners. All products feature micronized monocrystalline diamond surfaces and are manufactured in the USA (Marlborough, Massachusetts), with DMT's quality difference defined by diamond coverage, diamond uniformity, and surface flatness.

Differentiator

Problem solved

Functional benefit

Brands

• Diamond Whetstone™: Renowned polka dot pattern diamond surface that facilitates quick precision honing of all tools in every market.
• DuoSharp®
• Dia-Sharp®
• Diafold®
• Aligner™
• Mini-Sharp®
• Dia-Flat®
• Diafold® Magna-Guide®
• Dia-Sharp® Magna-Disc™
• Hardcoat™
• Crystal Saver®
• Flexi-Sharp®
• Dia-Paste™
• DiaSpray™
• Diamond Wave™
• Burr Doctor®

Products and services

• Diamond Whetstone Bench Stones
• DuoSharp Bench Stone
• Dia-Sharp Bench Stone
• Diafold Double-Sided Sharpener
• Diafold Serrated Knife Sharpener
• Diafold Single-Sided Sharpener
• Diafold Flat File
• Diafold Chain Saw Sharpener
• Mini-Sharp Sharpener
• Dia-Sharp Mini-Hone Sharpeners
• Dia-Sharp Magna-Disc Sharpening System
• Aligner Easy Edge-Guided Sharpening System
• Diafold Magna-Guide Sharpening System
• EdgeSharp SharpAdjust Sharpener
• SimpleSharp Diamond Sharpener
• Tri-Stone Rotator Diamond Sharpener
• EdgeSharp Pizza Wheel & Knife Sharpener
• EdgeSharp EverSharp Knife Sharpener
• EdgeSharp DiamondBench Pro Knife & Shear Sharpener
• Diamond Steel Sharpeners
• Ceramic Edge Sharpeners
• Dia-Flat Diamond Lapping Plate
• Crystal Saver Model
• Flexi-Sharp Sheets
• Dia-Paste and DiaSpray Diamond Compounds
• Diamond Wave and Honing Cones
• Hardcoat Surface Sharpeners
• Diamond Whetstone Edger
• Burr Doctor

Quantifiable outcome

• Outlasts conventional paper abrasive discs by more than 50-to-1
• +3 more outcomes

Named customers1 record

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Scale indicators4 records

Recent moves4 records

Expansion highlights4 records

Direct peers

• Work Sharp (Benchmade): Work Sharp manufactures electric and manual knife and tool sharpeners — including the WS2000/WS3000 models that DMT makes Magna-Disc sharpening accessories for. It is the most direct head-to-head competitor in the consumer/prosumer sharpening category, overlapping on countertop sharpeners and sharpening discs.
• Lansky Sharpeners: Lansky is a US-based sharpening-systems company producing guided angle-clamp sharpeners, controlled-angle systems, and diamond sharpeners. It competes with DMT in the guided-sharpening and pocket/pocket-friendly sharpener segments sold through similar hardware, sporting and cutlery retail.
• Smith's Consumer Products (Sharpening): Smith's (a subsidiary of Fortune Brands Innovations) produces a broad portfolio of manual and pull-through sharpeners, diamond sharpening stones and rods sold through mass retail, hardware chains, and sporting goods — directly competing with DMT in kitchen- and outdoor-oriented sharpening SKUs.
• Spyderco: Spyderco is a knife manufacturer that also sells branded sharpening stones, rods, and ceramic/Diamond sharpener systems. It overlaps with DMT in cutlery-store distribution channels and prosumer/knife-enthusiast customer segments and is a frequent substitute at the brand level.
• Tormek: Tormek (Sweden) is a specialist in wet-sharpening and guided-angle sharpening systems for woodworking and culinary tools. It is a direct alternative to DMT's guided-sharpening and bench stone lines for premium woodworking and professional kitchen users.
• Edge Pro: Edge Pro manufactures modular, apex-style guided sharpening systems used by knife enthusiasts and professionals. It competes with DMT's Aligner and Magna-Guide systems in the guided-sharpening enthusiast niche.
• Chef'sChoice (EdgeCraft): Chef'sChoice by EdgeCraft makes electric and manual sharpeners for kitchen knives and household blades. It is a direct competitor in the home/consumer countertop and pull-through sharpener category and overlaps with DMT's EdgeSharp countertop line at similar mass-retail price points.
• Shapton: Shapton is a Japanese sharpening-stone maker focused on high-end ceramic and glass stones for woodworking and culinary knives, distributed through premium woodworking retailers (e.g., Highland Woodworking) where DMT is also present.

Broad incumbents

• Norton Abrasives (Saint-Gobain): Saint-Gobain's Norton Abrasives is a global industrial abrasives manufacturer producing bonded, coated, and diamond abrasive products. As a broad incumbent it competes with DMT in industrial and woodworking channels and supplies many of the alternative waterstones, India stones, and diamond stones DMT positions against.

Emerging players

• Warthog Sharpeners: Warthog Sharpeners produces diamond-impregnated sharpening tools, including replacement blade cartridges marketed for kitchen knives. It is a smaller emerging brand competing with DMT's EdgeSharp and Diafold product lines in the consumer/household segment.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/dmtsharp
• YouTubeyoutube.com/user/DIADMT
• Facebookfacebook.com/dmt-60858033354
• LinkedInlinkedin.com/company/dmt-diamond-machining-technology
• Instagraminstagram.com/dmtsharp
• Pinterestpinterest.com/dmtsharp
• TikToktiktok.com/@dmtsharp

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Diamond Machining Technology (DMT)