Impact screwdriver bit Tvardy H4 25 mm S2 set (2/10/50/500 pieces)

Tvardy Impact screwdriver bit H4, 25 mm, is a compact driver bit designed for use with impact drivers and screwdrivers. Manufactured from S2 tool steel, this bit offers increased toughness and resistance to shock loads common when fastening H4-type fasteners. Available in multiple pack sizes, it fits standard 1/4" hex chucks and is intended for both professional tradespeople and DIY users who need reliable, repeatable performance when driving H4 screws.

Advantages

The S2 tool steel construction provides enhanced durability and better resistance to wear compared with standard steel bits. The 25 mm length gives a balance between reach and control, reducing wobble during high-torque impact driving. Designed specifically for H4 fasteners, the bit head geometry ensures accurate engagement and helps prevent cam-out. Multiple pack size options allow purchasing to match job scale, from occasional home use to bulk needs for workshops or construction sites.

Suitable for

• Driving H4 screws with impact drivers and cordless screwdrivers
• Professional installation and assembly tasks requiring shock-resistant bits
• DIY projects where durable, repeatable fastening is needed
• Workshops, construction sites, and maintenance operations

Key specifications

• Bit type: H4 screwdriver bit
• Material: S2 tool steel
• Length: 25 mm
• Drive connection: 1/4" hex-compatible
• Intended use: impact-rated (impact driver and impact screwdriver compatible)
• Available pack quantities: small to bulk packs to suit different needs

How to use

Insert the H4 bit into the 1/4" hex chuck of your impact driver or screwdriver until it seats securely. Select appropriate torque and speed settings for the fastener material and size. Apply steady pressure and allow the impact tool to drive the screw, keeping the bit aligned with the fastener to ensure correct engagement. After use, inspect the bit tip for wear or deformation and replace when engagement becomes inconsistent.

Usage recommendations

For longer bit life, avoid excessive side loading and use torque settings suitable for the fastener and substrate. Store bits in a dry place and consider swapping to fresh bits if frequent cam-out or rounding of the fastener head is observed.