Zinc-Plated Wafer Head Self-Drilling Screws with Wide Wafer Head and Self

Product Specification

Zinc-Plated Wafer Head Self-Drilling Screws for Chipboard

This product is a wafer head self-drilling screw specifically engineered for fastening chipboard (particleboard), MDF, OSB, plywood, and other engineered wood products. The wide wafer head increases surface contact for stronger fastening in weaker materials, while the self-drilling point eliminates the need for pre-drilling in most applications. Manufactured from carbon steel (C1022A) with a zinc-plated finish, the screw features a reduced head height that avoids interference with moving elements and provides an aesthetic, low-profile finish. Available with Phillips, Pozi, square, or Torx recess drives, it is widely used in furniture assembly, cabinetry, sliding doors, inlaid locks, and joining soft materials (wood, plastic, chipboard) to metal substrates.

What dimensional ranges and applicable standards are available for wafer head chipboard screws?

Thread diameters typically range from ST2.5 to ST8.0, with common sizes including 4.2 mm, 4.5 mm, and 5.0 mm. Lengths range from 9 mm to 300 mm, with standard offerings from 13 mm up to 120 mm. Common standards include DIN 7504 for self-drilling wafer head screws, DIN 7505A / DIN 7505B for chipboard/wood screws, and ISO 15480 for hexagon washer head self-drilling screws (similar design with hex head). The wafer head features a head diameter approximately 9.8 mm for 4.2 mm thread size, with a reduced head height of approximately 2.3 mm. Threads are fully threaded along the shank, with coarse pitch (1.4 mm for 4.2 mm diameter) providing maximum grip in wood-based materials.

What material properties and mechanical performance requirements apply?

Carbon steel versions are manufactured from C1022A grade with case hardening heat treatment. Case hardness ranges 500–700 HV (0.3 kg test load), with torsional strength minimum values of 4.3 Nm for 4.5 mm diameter and 6.2 Nm for 5.0 mm diameter. Stainless steel variants are available in 304 (A2) for general corrosion resistance. The zinc-plated finish (clear, yellow, or white passivation) provides reliable corrosion protection for indoor and light outdoor applications. Alternative finishes include Dacromet, Ruspert, phosphate, and black oxide. Recommended installation speed is 2,300–2,500 RPM maximum drill speed.

How does the wafer head design benefit chipboard fastening applications?

The wide wafer head distributes clamping load over a larger surface area, preventing pull-through in softer chipboard and MDF materials. The reduced head height allows flush or near-flush installation, avoiding interference with sliding mechanisms in applications such as sliding doors, drawer slides, and inlaid locks. The self-drilling point drills its own pilot hole and forms the mating thread in a single operation, significantly reducing assembly time. The cone transition between thread and head ensures the screw sits perfectly against the workpiece surface. The design allows the screw to serve as a substitute for rivets in many applications, with the advantage of being removable. For metal-to-wood joints, the self-drilling point drills through thin metal sheets (0.70 mm to 4.40 mm thickness) and then threads into the underlying wood or chipboard. 410 stainless steel variants are specifically recommended for use with aluminium to avoid galvanic corrosion.

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