CMT 543.079.51 - Mortising Chisel & Bit Set - 5/16" Diameter, 3/4" Shank
CMT 543.079.51 - Mortising Chisel & Bit Set - 5/16" Diameter, 3/4" Shank
Delivery usually 2–5 business days.
Answers come from this product's details and the manufacturer's site. Email us instead
The CMT 543.079.51 Mortising Chisel & Bit Set is engineered for woodworkers who refuse to compromise on the strength and accuracy of the classic mortise and tenon joint. While this traditional joint is notoriously difficult to master, CMT’s industrial-grade tooling simplifies the process, ensuring clean, square-walled mortises with every pass. Constructed from premium high-speed steel (HSS), this set is designed to withstand the rigorous friction and heat generated during heavy-duty boring operations in both hard and soft woods.
Engineered for use with standard drill press mortising attachments or dedicated mortising machines, the chisel features a precision-ground edge for effortless wood fiber shearing, while the internal bit efficiently clears chips to prevent clogging. This synergy of design allows for flawless joinery in cabinetry, furniture making, and architectural millwork.
Performance Features
- Industrial High-Speed Steel (HSS): Provides exceptional durability and maintains a razor-sharp edge under high-heat conditions.
- Precision Geometry: The chisel is ground to exacting tolerances to ensure perfectly square corners and vertical walls.
- Efficient Chip Evacuation: The internal drill bit is optimized to pull waste material upwards, reducing heat buildup and preventing bit deflection.
- Universal Compatibility: Fits most standard 3/4" (19mm) shank mortising machines and drill press attachments.
- Vibration Dampening: Balanced construction minimizes chatter, ensuring a smoother finish on internal mortise faces.
Technical Specifications
| SKU | 543.079.51 |
| Cutting Diameter (D) | 5/16" (7.94mm) |
| Shank Diameter (S) | 3/4" (19mm) |
| Rotation | Right Hand (RH) |
| Material | High-Speed Steel (HSS) |
| Number of Cutting Edges | 1 (Z1) |
What's Included
- 1 x Hollow Square Mortising Chisel (5/16")
- 1 x Matching Internal Boring Bit
Shipping & Returns
Shipping & Returns
Free Shipping Canada Wide* on Orders Over $149
Orders over $149 (before tax) that weigh 50 lb or less ship free.
Free Shipping Policy Restrictions
Large or heavy items (over 50 lb) ship at the most economical rate available. Orders shipping to the Northwest Territories, Yukon and Nunavut are not eligible for free shipping. *Our free shipping policy is subject to change without notice.
How long will it take to get my order?
Delivery usually 2–5 business days after dispatch. Expedited shipping is available at extra cost on request.
Most in-stock orders placed by 1:00 PM ET (Monday–Friday) ship the same day. Orders placed after 1:00 PM ET, on weekends or on holidays ship the next business day.
Large, overweight and LTL freight orders may need 1 or more extra business days to prepare.
What shipping carriers do you use?
Most orders are shipped courier via Purolator, UPS, or Canada Post. We will use other carriers at our own descretion depending on Product size and weight.
Do you ship overseas?
We are not currently shipping to the USA. We are currently mainly shipping within Canada, and we are slowly adding Other Countries. Please Contact us if you are unable to Checkout. See more out International Orders HERE
I only received part of my order, where is the rest?
Your order may ship in more than one package depending on the quantity or size of the products purchased. Also, items in your order may ship from either of our 2 locations and arrive in separate deliveries.
Sometimes we place smaller items from your order inside of one box to save on shipping so always open all boxes to confirm what you have recieved.
Can I return my product?
Returns and exchanges follow the manufacturer's satisfaction guarantee for each brand. Please contact us before sending anything back, and we will tell you where to send it.
If a product is defective on arrival and you notice it and contact us within 3 days of delivery, Wise Line Tools will handle it and pay the shipping.
You pay the shipping cost of returning an item, or you can bring it to either of our stores.
See our Returns Policy and Warranty Information for details.
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Shoot our team an email & we’ll get back to you ASAP
How fast will my order ship?
How fast will my order ship?
Most in-stock orders placed before 1 PM ET (Mon–Fri) ship the same day. Delivery usually 2–5 business days after dispatch. You will get a tracking email once your order ships.
Do you ship internationally?
Do you ship internationally?
We mainly ship within Canada and are not currently shipping to the USA. Please contact us about other international orders.
What is your return policy?
What is your return policy?
Returns and exchanges follow the manufacturer's satisfaction guarantee. Please contact us before sending anything back. If a product is defective on arrival and you notice it and contact us within 3 days of delivery, Wise Line Tools will handle it and pay the shipping. You pay return shipping, or you can bring the item to either of our stores. See our Returns Policy and Warranty Information.
