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Screw Fischer 670178 70 mm 100 pc(s)
FISCHER 670178 screw is a metal wood screw 70 mm long with a 4 mm thread diameter and a thread length of 42 mm. Supplied in a pack of 100, this screw is intended for general woodworking connections where a reliable metal-to-wood fastener is required. The screw’s dimensions and full-metal construction provide secure anchoring in sapwood and most common hardwoods when used with appropriate pilot holes and installation technique.
These 70 mm wood screws offer consistent thread form and dimensional tolerances suitable for repetitive assembly tasks. The 4 mm diameter combined with a 42 mm thread length balances holding strength and material penetration, reducing the risk of splitting in thinner boards when a correct pilot hole is made. A 100-piece pack supports larger projects or repeated maintenance work, ensuring you have matching fasteners on hand for uniform results.
Drill an appropriate pilot hole before installing the screw to reduce the chance of splitting and to ensure correct alignment; pilot hole diameter depends on the wood species and density. Drive the screw using a compatible screwdriver or bit, applying steady axial force and avoiding over-tightening, which can strip threads or compress the wood. For exposed exterior applications, verify corrosion resistance or use additional surface protection as required.
For optimal holding and minimal material stress, select a pilot hole slightly smaller than the thread core diameter for hardwoods and closer to the thread outer diameter for softwoods. Use consistent torque and a suitable bit to prevent cam-out and to maintain screw head integrity during repeated use.
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