Product Overview
Wera 840/4 Z bits are a series of bits designed for use with internal hexagon screws. The product is listed on Wera's product page under the 840/4 Z bits family and is described as extra-tough (Zähhart) and equipped with Wera's Hex-Plus profile to increase the contact area in the screw head.
Design and Function
The Hex-Plus profile increases the contact surface between the bit and the screw by transferring force from the flanks rather than from the corners — a feature that, according to the manufacturer, reduces the risk of notching and damage to the screw head. 840/4 Z bits are also specified as extra-tough (Zähhart), which Wera indicates is suitable for universal screw assembly in this bit category.
Application and Compatibility
840/4 Z bits are used for internal hexagon screws and are designed with a 1/4" hexagon drive (Wera connecting series 4). According to the manufacturer, this 1/4" hexagon drive is compatible with holders in accordance with DIN ISO 1173‑F 6.3. The product family includes tip sizes down to 1/16" (0.05") and blade lengths of 50 mm, as stated on the manufacturer's product page.
- Bit series: 840/4 Z bits.
- Profile: Hex-Plus (increased contact surface).
- Hardness type: extra-tough (Zähhart), as specified by the manufacturer.
- Connection: 1/4" hexagon drive, compatible with DIN ISO 1173‑F 6.3.
Specifications
- Product family: 840/4 Z bits (Wera).
- Manufacturer's part number: 05135090001.
- Profile: Hex-Plus.
- Hardness type: extra-tough (Zähhart).
- Connection: 1/4" hexagon drive (Wera connecting series 4), compatible with DIN ISO 1173‑F 6.3.
- Tip sizes: down to 1/16" (0.05").
- Blade length: 50 mm (family information on the manufacturer's page).
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