What is the purpose of the bore hole in this bit?

The BO bore hole accommodates safety hexagon socket screws with a central pin for secure fastening.

What drive connection does this bit have?

It features a standard 1/4" hexagon drive suitable for holders conforming to DIN ISO 1173-F 6.3.

What is the advantage of the Hex-Plus profile?

Hex-Plus provides a larger contact surface in the screw head to prevent rounding out and screw damage.

What are the length and tip size of this bit?

The bit has an overall length of 89 mm and a hex tip size of 2 mm.

Is this bit VDE-certified for live electrical work?

No, this bit is not VDE-certified or insulated for use on energized electrical installations.

WERA 840/4 Z Hex-Plus BO hexagonal BO bits with bore, 2 x 89 mm - 05059640001

Name: WERA 840/4 Z Hex-Plus BO hexagonal BO bits with bore, 2 x 89 mm - 05059640001
Brand: WERA
SKU: 02775791
Price: 12.95 EUR
Availability: PreOrder

Supplier number: WERA 05059640001 | EAN 4013288094292

Recommended Retail Price €21.24

12.95 tax incl.

€10.70 excl. VAT (incl. all environmental contributions)

On order: delivered from 22/10/2026

Ordered before 20:00 - delivered as of 22/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

✆ Talk to a specialist

Precise fastening with the Wera bit

Practical benefits

Bore hole for security screws: You effortlessly drive tamper-proof hexagon socket screws with safety pins thanks to the dedicated bore hole.
Protection against screw damage: The Hex-Plus geometry provides a larger contact surface to prevent rounded screw heads during heavy use.
Extended reach for recesses: With an 89 mm length, you easily access deep-set fasteners using your standard 1/4" bit holder.

In a nutshell

The right choise for

Drive and loosen tamper-proof hexagon socket screws with a center safety pin using the Wera 840/4 z Hex-Plus bo 2 x 89 mm bit. Its dedicated bore hole securely engages security fasteners that standard hex bits cannot turn. Engineered with the Hex-Plus geometry profile, it provides a larger contact surface inside the screw head to prevent rounding out and damage during demanding work. The extended 89 mm length gives you direct reach into deep recesses and narrow gaps without requiring an extra bit holder extension. Designed with a standard 1/4" hex drive conforming to din iso 1173-F 6.3, this 2 mm hex bit delivers total control for precision mechanics, maintenance and electronics assembly.

Product information FAQ

€12.95

tax incl.

Key features according to our expert

Length: 89 mm
Blade thickness: Not applicable
Type of drive profile (bit): Hexagon
Connection size (bit): 1/4"
VDE approved: No
Bit profile: HEX 2 mm
Drive profile size (bit): 2 mm
Product Range: Wera Hex-Plus

Scope of delivery

840/4 Z Tamper-proof Hex-Plus BO bits, 2 x 89 mm

Product description

Tough viscous Wera bits for hexagon socket screws for universal use. The Hex-Plus profile offers a greater contact surface in the head of the screw. The notching effect is therefore reduced to a minimum and damage to the screw head more or less eliminated. 1/4" hexagon, suitable for holders as per DIN ISO 1173-F 6.3. Hexagon socket BO screws have a protruding pin in their drive profile. This prevents any unauthorised loosening since the "normal" hex tools cannot move these screws. 1/4" hexagon, suitable for holders as per DIN ISO 1173-F 6.3.

For hexagon socket screws with safety pin (BO = with bore hole)
Hex-Plus allows socket head screws to live longer
Tough for hard materials
1/4" hexagon drive (Wera connecting series 4)

Application

Hexagon socket screws with safety pin (BO = with bore hole)

Drive

1/4" hexagon, suitable for DIN ISO 1173-F 6.3 bit holders

Design

Hex-Plus with bore hole, tough, for universal use

Features and benefits

For hexagon socket screws with safety pin.
Hexagon socket screws are a problem, because the contact surfaces that transfer the force of the tool to the screw are very narrow. The consequence: the head of the screw can be damaged, usually rounding out the recess. Hex-Plus tools have larger contact surfaces to prevent this, driving from the flats of the recess, rather than the corners. Good to know: Hex-Plus tools fit into every standard hexagon socket screw!
Tough Wera bits prevent the tip from breaking prematurely. Z-bits usually are the bit for universal screwdriving applications.

All Features

Length: 89 mm
Blade thickness: Not applicable
Type of drive profile (bit): Hexagon
Connection size (bit): 1/4"
Vde approved: No
Bit profile: HEX 2 mm
Drive profile size (bit): 2 mm
Product range: Wera Hex-Plus

Brand WERA
02775791
EAN 4013288094292
Supplier number WERA 05059640001

Frequently asked questions about this product

Answered by specialists

What is the purpose of the bore hole in this bit?: The BO bore hole accommodates safety hexagon socket screws with a central pin for secure fastening.
What drive connection does this bit have?: It features a standard 1/4" hexagon drive suitable for holders conforming to DIN ISO 1173-F 6.3.
What is the advantage of the Hex-Plus profile?: Hex-Plus provides a larger contact surface in the screw head to prevent rounding out and screw damage.
What are the length and tip size of this bit?: The bit has an overall length of 89 mm and a hex tip size of 2 mm.
Is this bit VDE-certified for live electrical work?: No, this bit is not VDE-certified or insulated for use on energized electrical installations.