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

This step drill bit has 9 steps for drilling diameters from 4 to 20 mm.

What type of shank does this bit have?

It features a 1/4" hexagonal shank (HEX) suitable for drill chucks and bit holders.

Do you need to centre-punch before drilling?

No, the split-point tip allows for an easy and precise start without centre-punching.

Which materials is this HSS drill bit suitable for?

It is suitable for sheet metals, profiles, non-ferrous metals, plastics, and wood.

What is the overall length of this drill bit?

The total length of the bit is 70.5 mm.

BOSCH 2608597524 step drill HSS 4-20 1/4", 70.5 mm

Name: BOSCH 2608597524 step drill HSS 4-20 1/4", 70.5 mm
Brand: BOSCH
SKU: 02222426
Price: 47.8 EUR
Availability: PreOrder

Supplier number: BOSCH 2608597524 | EAN 3165140107396

Recommended Retail Price €112.72

47.80 tax incl.

€39.50 excl. VAT (incl. all environmental contributions)

On order: delivered from 16/10/2026

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Ordered before 20:00 - delivered as of 16/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

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Smooth drilling without prepunching

Practical benefits

Nine diameters in one: You drill and deburr clean holes from 4 to 20 mm using a single Bosch HSS step bit.
Immediate and accurate starting: The split-point tip prevents wandering so you start drilling directly without needing a center punch.
Reduced vibration during cuts: A spiral flute provides optimal chip clearing, while the 1/4" hex shank ensures maximum torque transfer in your chuck.

In a nutshell

The right choise for

With the Bosch hss step drill bit 4-20 mm, you can drill and deburr multiple hole sizes without the hassle of changing bits. The split-point tip allows for an accurate start in thin sheet metal, profiles, or electrical enclosures without any need for centre-punching. Its spiral flute ensures smooth chip removal and reduces vibrations for clean, controlled drilling. Equipped with a 1/4" hex shank, the bit locks securely into your chuck or bit holder for maximum torque transfer without slipping. This lets you work faster and achieve neat, accurate results across metal and plastic materials.

Product information FAQ

€47.80

tax incl.

Key features according to our expert

Smallest diameter: 4 mm
Largest diameter: 20 mm
Shank size: 1/4 inch

Product description

Step drill bit HSS 4-20 1/4", 70.5 mm
Smooth drilling of various diameters with one drill bit
HSS step drill bit can make smooth drillings of various diameters with one drill bit
Pre-punching is unnecessary as the split point enables easy drilling

Advantages

Drilling various diameters - The HSS step drill bit can make smooth, burr-free holes of various diameters with a single drill bit.
The drill bit is ideal for deburring, drilling round holes and enlarging existing holes.
Pre-punching is unnecessary as the split tip allows easy drilling.
The CNC ground spiral groove offers optimised chip removal and reduced vibration for uniform drilling.
Axial and radial back grinding ensure excellent cutting performance and absolute smoothness.
This step drill is suitable for use on thin materials, such as non-ferrous metals, sheet plastic, sheet steel, plastic and stainless steel.
The step drill is made of HSS (High-Speed Steel) and will last a long time if coolant is used.
Using laser, the hole diameters in both spiral grooves are clearly visible and durably marked.
Hexagonal shank for maximum power transfer in standard three-claw drill chucks and drill/screw machine holders.

All Features

Smallest diameter: 4 mm
Largest diameter: 20 mm
Shank size: 1/4 inch
Implementation: HSS
Overall length mm: 70,5
Shaft diameter in.: 1/4
Stair height mm: 4
Stair diameter (range) mm: 4-20
Stair diameter (all) mm: 20 / 6 / 8 / 10 / 12 / 14 / 16 / 18 / 20

Brand BOSCH
02222426
EAN 3165140107396
Supplier number BOSCH 2608597524

Frequently asked questions about this product

Answered by specialists

Which hole diameters can you drill with this Bosch step drill bit?: This step drill bit has 9 steps for drilling diameters from 4 to 20 mm.
What type of shank does this bit have?: It features a 1/4" hexagonal shank (HEX) suitable for drill chucks and bit holders.
Do you need to centre-punch before drilling?: No, the split-point tip allows for an easy and precise start without centre-punching.
Which materials is this HSS drill bit suitable for?: It is suitable for sheet metals, profiles, non-ferrous metals, plastics, and wood.
What is the overall length of this drill bit?: The total length of the bit is 70.5 mm.