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Bit Selection Guide

Wiha Bit Quality Overview

In continuous use of screw applications, screwdriver bits are exposed to maximum strains. Depending on the type of application, maximum wear resistance and highest elasticity is of most importance. Wiha provides you with a large assortment of high quality bits and provides the perfect solution for all screw applications.

	Applications	Highlights	Coating and hardness

Standard Bit	For all standard applications	Tough, hard bit, outstanding value for money; available with many different blades and in many sizes	No coating 61 HRC

ZOT Torsion Bit	Ideal for uneven, hard screw applications e.g. in metal	Patented, tough, hard, optimised torsion zone (ZOT) “cushions” the torque peaks after turning the screw and prevents premature breakage of the bit	No coating 61 HRC

ACR Torsion Bit	Ideal for applications where the bit must be held tight; particularly suitable for uneven, hard screw applications e.g. in metal	The Anti Camout Ribs (ACR) hold the bit firmly in the screw and prevent slipping. Patented, tough, hard, optimised torsion zone (ZOT) “cushions” the torque peaks after turning the screw and prevents premature breakage of the bit	No coating 61 HRC

HOT Torsion Bit	Ideal for soft screw applications, e.g. in wood	The extra-hard (63 HRC) optimised torsion zone (HOT) ensures that the optimum force is always transferred when turning the screw without the bit being subject to wear. The colour coating of the entire bit indicates HOT quality and also serves as corrosion protection	The special coating applied via the barrel method makes it easier to differentiate between different colours and also offers corrosion protection Special Hardness of 63 HRC

Inkra Bit	Ideal for screw applications on corners and edges	Awarded top marks in a test conducted by the Stiftung Warentest German consumer magazine; special, patented geometry for working in inclined positions up to 10°	The special coating applied via the barrel method makes it easier to differentiate between different colours and also offers corrosion protection 61 HRC

TiN Torsion Bit	Ideal for industrial applications and production lines	Optimum tool life thanks to very hard Titanium Nitride coating (TiN); combines the advantages of HOT and ZOT bits in a single bit	Titanium nitride coating 61 HRC

Diamond Torsion Bit	Ideal for demanding applications in industry and trade	Finest and wear-resistant diamond and sapphire micro-particles grip in the bit tip and transfer the force straight from the hand to the screw	Tungsten-carbide micro-particles in the tip and the nickel-gold coating of the entire bit ensure extended corrosion-resistance 61 HRC, at the surface approx. 10,000 HV

DuraBit with torsion zone	Finest and wear-resistant diamond and sapphire micro-particles grip in the bit tip and transfer the force straight from the hand to the screw	Hard and wear-resistant, tungsten-carbide micro-particles in the bit tip gain a secure grip of the screw head, prevent the bit from slipping out of the screw and thus not only protect the material surface but also ensure optimum force transfer	Tungsten-carbide micro-particles in the tip and the nickel-gold coating of the entire bit ensure extended corrosion-resistance 61 HRC, at the surface > 10,000 HV

Stainless steel bit	Ideally suitable for fastening and unfastening of stainless steel screws	The bits of high-quality, non-rusting stainless steel are completely vacuum-hardened and are characterised by a high level of fitting accuracy and durability.	No coating 61 HRC