Milwaukee 48-20-3956 SDS-Max M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$229.71
Milwaukee 48-20-3956 SDS-Max MX4 4-Cutter Drill Bit, 1" x 31" x 36"

Milwaukee 48-20-3956 SDS-Max MX4 4-Cutter Drill Bit, 1" x 31" x 36"

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Model: 48-20-3956

In Stock (leaves warehouse same day if ordered before 3pm ET)

$229.71
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Milwaukee 48-20-3956 SDS-Max MX4 4-Cutter Drill Bit, 1" x 31" x 36"

The Milwaukee 48-20-3956 is a professional-grade SDS-Max MX4 drill bit engineered for rotary hammer drilling in concrete and masonry. Featuring a 1" diameter head with Milwaukee's 4-cutter (4CT) MX4 head design, this bit measures 31" in working length by 36" overall, making it well-suited for deep-hole drilling on jobsites that demand extra reach and durability. The SDS-Max shank delivers a secure, tool-free fit in compatible rotary hammers, helping electrical, plumbing, and construction trades work efficiently through demanding concrete drilling tasks.

Key Features

  • Diameter: 1" cutting diameter sized for large SDS-Max rotary hammer applications.
  • Overall Length: 36" overall length with a 31" working length, giving crews the reach needed for deep-hole drilling.
  • MX4 4-Cutter Head: Milwaukee's 4CT four-cutter head design is engineered to help the bit drill faster and last longer than standard 2-cutter designs.
  • SDS-Max Shank: Sized to fit SDS-Max rotary hammer chucks for quick, secure, tool-free bit changes on the jobsite.
  • Jobsite-Ready Sizing: The 1" x 31" x 36" sizing supports demanding concrete and masonry drilling where standard-length bits fall short.

Technical Specifications

  • Model: Milwaukee 48-20-3956.
  • Cutting Diameter: 1".
  • Working Length: 31".
  • Overall Length: 36".
  • Shank Type: SDS-Max.
  • Head Design: MX4 4-Cutter (4CT).

Typical Applications

  • Concrete and Masonry Drilling
  • Rotary Hammer Drilling Applications
  • Deep-Hole Drilling for Anchor Installation
  • Commercial and Industrial Construction
  • Renovation and New Construction Projects

Why Milwaukee?

Milwaukee is a trusted name among professional contractors for durable, high-performance power tool accessories built to keep pace with demanding jobsite conditions. The 48-20-3956 MX4 drill bit reflects Milwaukee's 4-cutter head engineering, designed to help crews drill faster in concrete while getting more usable life out of every bit. With its 1" x 31" x 36" sizing and SDS-Max shank, this bit is built for professional rotary hammer drilling where reliability and reach matter most. Shop Milwaukee SDS-Max drill bits and rotary hammer accessories at ZenSupply.

Manufacturer Resources

Product Specs

list_batch:
MWK-20260922
Product Type:
Masonry Drill Bit
Series:
MX4
Connection Type:
SDS-Max Shank
Department:
Tools
Product Subgroup:
Drill & Driver Bits
Product Size:
1"
Product Group:
Power Tools & Accessories
Product Length:
36 in

Milwaukee 48-20-3956 – Frequently Asked Questions

1) Will the Milwaukee 48-20-3956 bit fit my rotary hammer chuck?
Only if the hammer takes SDS-Max. The 48-20-3956 has an SDS-Max shank, which drops into an SDS-Max rotary hammer chuck tool-free. It will not go into an SDS-Plus or spline-drive chuck, and there is no adapter path that makes a 1 inch bit at 36 inches practical on a smaller SDS-Plus hammer anyway. If your hammer is SDS-Plus, you need an SDS-Plus bit instead.
2) What is the difference between the 31 inch and 36 inch numbers on this Milwaukee SDS-Max bit?
They are working length and overall length. The 48-20-3956 drills to 31 inches of usable depth, and the bit measures 36 inches end to end including the SDS-Max shank. When you are sizing a through-hole, work off the 31 inch figure, not the 36.
3) I need to drill through a thick footing or slab for conduit sleeves. Is this long enough?
For runs up to 31 inches deep, yes. That is the working depth of the 48-20-3956, with a 36 inch overall length, which covers most footings, thick slabs and foundation walls in one pass. Anything deeper than 31 inches needs a longer bit or drilling from both faces.
4) Can a Lenox 12111-10DGHS diamond grit drill bit be used in place of the Milwaukee 48-20-3956 for concrete rotary hammer work?
No. The Milwaukee 48-20-3956 is an SDS-Max shank bit with an MX4 4-cutter carbide head, sized 1 inch diameter by 31 inch working length and 36 inch overall, and it seats directly in an SDS-Max rotary hammer chuck for hammer drilling concrete and masonry. The Lenox 12111-10DGHS is a 5/8 inch diamond grit bit in the D/S-10Dg series, a different cutting technology and a different diameter, so it does not drop into an SDS-Max rotary hammer in place of the Milwaukee bit. If the job is deep-hole concrete drilling for anchor installation, stay with the SDS-Max 48-20-3956.
5) What size hole does the Milwaukee 48-20-3956 drill, and will it work for a 1 inch anchor?
It cuts a 1 inch diameter hole. Anchor diameter and hole diameter are not always the same number, so match the bit to the hole size called out in the anchor manufacturer's instructions rather than to the anchor's bolt diameter. For deep-set anchors it has the reach, with 31 inches of working depth.
6) Is a 4-cutter bit worth it over a standard 2-cutter for concrete?
At 1 inch diameter in reinforced concrete, yes. The MX4 head on the 48-20-3956 carries four carbide cutters instead of two, which Milwaukee builds to drill faster and last longer than a 2-cutter design. The practical benefit shows up on large diameters and long holes where a 2-cutter tip wanders or dulls early. For small-diameter occasional holes the extra cutters matter much less.
7) Can I use this Milwaukee SDS-Max bit to core a hole through a block wall or just solid concrete?
The 48-20-3956 is a rotary hammer bit for concrete and masonry, so block, brick and poured concrete are all in scope. It is a percussion bit, not a core bit, so it makes a single 1 inch hole rather than cutting a large opening. It is not for steel, tile, or glass.
8) What is the Milwaukee part number for the 1 inch x 36 inch SDS-Max MX4 bit?
Milwaukee 48-20-3956. That number covers the 1 inch diameter MX4 4-cutter SDS-Max bit at 31 inch working length and 36 inch overall. One size is sold under it, so there is no diameter or length option to pick.
How fast can I get the Milwaukee 48-20-3956 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Milwaukee 48-20-3956 come with a warranty?
Absolutely. The Milwaukee 48-20-3956 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Milwaukee 48-20-3956?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Milwaukee 48-20-3956 from ZenSupply?
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