Which hole diameters can you drill with this step drill bit?

This bit features 9 steps for drilling diameters of 4, 6, 8, 10, 12, 14, 16, 18, and 20 mm.

What shank type does the Makita D-40185 have?

It features a standard 1/4" (6.35 mm) hex shank.

Which materials are suitable for this step drill bit?

It is suitable for sheet steel, non-ferrous metals, alloyed steel, and plastics.

What is the advantage of the titanium coating (TiN)?

The titanium nitride coating reduces friction and significantly extends tool life.

Can this step drill bit be used with impact drivers?

No, this step drill bit is not suitable for use in impact drivers.

MAKITA D-40185 spiral staircase drill with titanium coating 4-20 mm

Name: MAKITA D-40185 spiral staircase drill with titanium coating 4-20 mm
Brand: MAKITA
SKU: 02625120
Price: 52.4 EUR
Availability: PreOrder

Supplier number: MAKITA D-40185 | EAN 0088381400381

Recommended Retail Price €84.80

52.40 tax incl.

€43.31 excl. VAT (incl. all environmental contributions)

On order: delivered from 12/10/2026

Ordered before 20:00 - delivered as of 12/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

✆ Talk to a specialist

Clean drilling with the Makita D-40185

Practical benefits

Nine steps in one: You create clean holes from 4 to 20 mm without swapping tools thanks to the nine integrated steps.
Smooth spiral chip removal: The spiral flute design delivers effortless cutting progression and clears metal debris quickly during operation.
Hardened titanium nitride coating: The durable TiN layer minimizes friction and extends service life during regular metalworking tasks.

In a nutshell

The right choise for

With the Makita D-40185 spiral step drill bit, you create clean holes in multiple sizes quickly without constantly swapping tools. Featuring 9 steps ranging from 4 to 20 mm and a cutting length of 53 mm, it allows you to drill, enlarge, and deburr openings in sheet steel, alloyed steel, non-ferrous metals, and plastics with ease. The spiral flute design delivers smooth cutting performance and rapid chip removal, preventing the bit from snagging in thin sheet materials. Furthermore, the durable titanium nitride (TiN) coating minimizes friction and heat build-up to significantly extend service life. The standard 6.35 mm (1/4") hex shank ensures a secure grip in your drill chuck for every installation job.

Product information FAQ

€52.40

tax incl.

Key features according to our expert

Smallest diameter: 4 mm
Largest diameter: 20 mm
Shank size: 6,35 mm
Number of steps: 9
Cutting length: 53 mm

Product description

Step drill spiral-shaped TiN 4 - 20 mm

All Features

Smallest diameter: 4 mm
Largest diameter: 20 mm
Shank size: 6,35 mm
Number of steps: 9
Cutting length: 53 mm
Internal diameter: 4 - 20 mm
Length: 75 mm
Working length: 53 mm

Brand MAKITA
02625120
EAN 0088381400381
Supplier number MAKITA D-40185

Frequently asked questions about this product

Answered by specialists

Which hole diameters can you drill with this step drill bit?: This bit features 9 steps for drilling diameters of 4, 6, 8, 10, 12, 14, 16, 18, and 20 mm.
What shank type does the Makita D-40185 have?: It features a standard 1/4" (6.35 mm) hex shank.
Which materials are suitable for this step drill bit?: It is suitable for sheet steel, non-ferrous metals, alloyed steel, and plastics.
What is the advantage of the titanium coating (TiN)?: The titanium nitride coating reduces friction and significantly extends tool life.
Can this step drill bit be used with impact drivers?: No, this step drill bit is not suitable for use in impact drivers.