The MK Diamond MK Yellow 4-inch (102mm) core bit is a standard grade, segmented wet core bit for drilling concrete and asphalt. It is built for concrete cutting contractors, plumbers, electricians and HVAC installers who want a dependable general-purpose bit that delivers fast drilling and good footage without stepping up to a premium grade. A common size for drain, vent and large conduit penetrations.
Built for
- Plumbing, drain and vent penetrations through concrete slabs and walls
- Electrical conduit and utility runs
- HVAC, duct and pipe sleeves
- General wet drilling in concrete and asphalt on repeat jobs
MK Diamond describes the MK Yellow as an excellent choice for all types of general wet drilling. Because it is a wet bit, it needs a core drill with a water feed. Keep a steady flow of water at the bit, let the segments do the cutting with even feed pressure, and follow your core drill manufacturer guidance for speed at this diameter, since larger bits generally run slower. Confirm your spindle thread and the finished hole size before you order.
MK Yellow or MK Orange?
MK Diamond sells the same range of diameters in two grades. The MK Yellow is the standard grade for general wet drilling, a sensible pick for routine penetrations where you want fast drilling and good footage. The MK Orange is the premium grade with a high diamond concentration for longer bit life, and MK lists it for light to moderate steel reinforcement. Match the grade to how hard and how often you will be coring.
Specifications
- Brand and model: MK Diamond MK Yellow, standard grade
- Part number: 156331
- Diameter: 4-inch (102mm)
- Segment height: 7.5 mm
- Drilling depth: 14"
- Arbor nut: 1-1/4"-7
- Drilling method: wet
- Materials: concrete and asphalt
- Additional diameters and lengths available on request.
Frequently asked questions
Is the MK Yellow core bit for wet or dry drilling?
It is a wet core bit. MK Diamond describes the MK Yellow for general wet drilling, so run it on a core drill with water supplied to the bit to cool the segments and flush slurry.
What arbor thread does the 4-inch MK Yellow use?
Per MK Diamond, MK Yellow bits from 1-5/8 inch up use a 1-1/4 inch, 7 threads per inch arbor nut, so this 4-inch bit fits core drills with a matching 1-1/4 inch-7 spindle thread.
How deep can this bit drill?
The bit has a 14 inch drilling depth with 7.5 mm tall segments. For deeper holes, MK Diamond offers additional lengths and diameters on request.
What materials is the MK Yellow made for?
Concrete and asphalt. It is the standard grade in the MK line. The MK Orange premium grade is the step up when you want longer bit life or need to cut light to moderate rebar.
Which MK Yellow size is this listing?
This listing is the 4-inch (102mm) bit, MK Diamond part number 156331. The MK Yellow line covers 28 diameters from 1 inch to 14 inches.
Discount Cleaning Products is an authorized MK Diamond dealer with US-based customer service. Send us your rig, hole size and material and we will help you match the right core bit.
