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Wera 840/1 ZBO Hex Pinned Security Bit Extra Tough - 4mm

Wera 840/1 ZBO Hex Pinned Security Bit Extra Tough - 4mm

SKU: 260326124429042 EAN: 4013288038593

Compare 3 prices for Wera 840/1 ZBO Hex Pinned Security Bit Extra Tough - 4mm — from £4.16 to £6.95 across 3 UK sellers including Tool Store Direct, Tooled Up, My Tool Shed. Save up to £2.79 (40%).

£4.16 14h ago
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Compare Prices from 3 Sellers

Prices updated 4 Sep 2026
2
Tooled Up
£6.95 +£2.79
11h
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3
My Tool Shed
£6.95 +£2.79
11h
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#2 Tooled Up
11h ago
£6.95 +£2.79
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#3 My Tool Shed
11h ago
£6.95 +£2.79
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The Wera 840/1 ZBO 4mm Hex Pinned Security Bit is engineered for heavier-duty applications where larger tamper-proof fasteners are required. This 4mm size is commonly specified in machinery assembly, automotive applications, and industrial equipment where both substantial torque transmission and security against unauthorised access are essential. The tough viscous construction provides the durability needed for professional tradespeople working daily with hard materials and demanding fastening applications. Featuring Wera's advanced Hex-Plus technology, this bit delivers superior performance by offering a significantly greater contact surface within the screw head. This innovation reduces the notching effect to a minimum and virtually eliminates screw head damage, ensuring your fasteners remain serviceable throughout their lifetime. The hexagon socket BO screw design, with its characteristic protruding pin in the drive profile, prevents any unauthorised loosening since normal hex tools cannot engage these security fasteners. With its industry-standard 1/4" hexagon drive compatible with Wera connecting series 1, this bit works seamlessly with holders conforming to DIN ISO 1173-D 6.3 and is suitable for use with Bosch, Fein, Holz-Her, Lecreux, and Metabo power tools. Features and Benefits: • Hex-Plus technology maximises contact surface area • Tough viscous construction for hard materials • Security pin prevents unauthorised fastener removal • 1/4" hexagon drive for universal compatibility • Compatible with major professional power tool brands Specifications: Bit Size: 4mm Length: 25mm Drive: 1/4" Hexagon Contents: • 840/1 Z Tamper-proof Hex-Plus BO bits, 4 x 25 mm
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