Sawing 14-inch joints through hot-mix asphalt is a race between the cut you need and the slurry that is quietly destroying your blade. The MK Diamond MK-710W Supreme grade blade is built for exactly that job: paving contractors, utility crews and municipal street departments running high-powered walk-behind saws who need full-depth cuts in asphalt and green concrete without pulling the blade off the arbor every few hundred feet. Part number 139071 is the 14-inch diameter on a .250 kerf and a 1-inch arbor.
Built for
- Full-depth utility and trench cuts through asphalt pavement
- Street and parking-lot repair, patch outlines and pavement removal
- Green concrete that is still soft and abrasive, typically cut within hours of placement
- Expansion and control joints where a clean, straight edge matters more than speed alone
- High-production crews who would rather buy one blade that lasts than three that do not
Why an asphalt-rated blade instead of a general-purpose one
Asphalt is soft, but the sand and rock it carries are not. As you cut, water turns that grit into a slurry that runs along the kerf and scours the steel core right at the point where the diamond segments are welded on. That erosion is called undercutting, and it is what actually kills most blades used on pavement: the segments are still full of diamond when the core beneath them gives up and lets them go. MK builds undercut protection into its asphalt line so the core survives as long as the segments do.
The second half of the equation is bond hardness, and it runs opposite to intuition. Soft, abrasive material wants a hard bond that holds each diamond in place until it is fully worn; hard, dense material wants a soft bond that releases spent diamonds and keeps exposing fresh ones. Asphalt and green concrete sit firmly at the soft-and-abrasive end, which is why running a cured-concrete blade in pavement wears it out so fast, and why this blade is bonded the way it is.
Specifications
- MK Diamond part number 139071, MK-710W series, Supreme grade
- Diameter 14-inch (356mm)
- Segment width (kerf) .250-inch
- Arbor 1-inch
- Segment height 12mm
- Laser-welded segmented rim
- Horsepower range 12 - 25 hp
- Wet cutting only
- Material: asphalt and green concrete
Getting the life the blade is capable of
Experienced sawyers are blunt about this: the fastest way to ruin an expensive blade is to force it. Pushing the cut faster than the saw wants to go, letting the blade bind in the kerf, plunging into the subgrade below the pavement, or cutting asphalt laid over a concrete base will all cost you segments in a hurry. Keep water volume up on both sides of the blade, let the machine set the feed rate, and cut one material at a time where you can. Inspect before every shift and pull the blade from service if you see missing or cracked segments, heat discoloration on the core, cracks radiating from the arbor, or visible undercutting at the segment line.
Frequently asked questions
Can the MK-710W be run dry?
No. This is a wet-cutting blade. Water cools the steel core, carries slurry out of the kerf and keeps segment temperature in range. Running it dry risks warping the core and losing segments, and it puts respirable silica into the air.
What is undercut protection and why does an asphalt blade need it?
Cutting pavement produces an abrasive sand-and-rock slurry that flows along the kerf and erodes the steel core directly beneath the diamond segments. Once that junction is worn away the segments lose their bond and can be thrown, even though they still hold diamond. Asphalt-rated blades are built to protect that area so the core lasts as long as the segments.
Will it cut green concrete as well as asphalt?
Yes. MK groups asphalt and green concrete together because both are soft and highly abrasive, and the same bond suits them. Cured concrete is a different job and calls for a blade bonded for cured concrete instead.
What saw does part number 139071 fit?
It has a 1-inch arbor and a 14-inch diameter, and MK rates the MK-710W for saws in the 12 - 25 hp range. Check the blade capacity and arbor of your machine before ordering, and confirm the saw can take a 14-inch blade at full depth.
How do I know when to take the blade out of service?
Inspect it before each shift and retire it if you find missing or cracked segments, heat discoloration, cracks in the core, or visible undercutting where the segments meet the core. A blade in that condition is a safety problem, not just a worn tool.
Discount Cleaning Products is an authorized dealer for the brands we carry, and we sell to paving crews, concrete cutters, tile and stone shops, facility maintenance departments and building service contractors across the United States. Orders ship from the manufacturer or its regional warehouse, and our US-based staff can confirm sizing, arbor fit and grade against your saw before you buy. If you are not sure which grade suits the material you are cutting, call or email us with the machine model and the mix you are working in and we will point you at the right part number.
