In the fastener world, the tip geometry of a screw is far more than a cosmetic feature — it determines how a screw enters material, how quickly it threads, and how much stress it imparts during installation. The Screws Wood Cutting Point is one of the most significant innovations in self-tapping screw design specifically engineered for wood-based engineered panels.
A Type 17 cutting point features a milled slot or notch at the tip of the screw, oriented transversely across the thread. This slot acts as a blade during installation: as the screw rotates, the notch cuts cleanly through wood fibers and composite particles rather than compressing and displacing them. The result is less resistance, faster drive time, reduced splitting risk, and significantly lower torque demand on the power tool or driver.
Figure 1: Structural comparison of a conventional sharp-point screw tip versus the Type 17 cutting slot. The milled notch removes rather than displaces material, minimizing splitting stress in chipboard and MDF.
The drive recess of a screw — the shape of the slot your screwdriver or bit engages — is critical to installation efficiency, bit lifespan, and torque transfer. The Pozi drive (also written as Pozidriv, ISO 4757) is a cross-shaped recess with additional radial lines at 45° between the primary wings. This distinguishes it from the visually similar Phillips drive.
The Phillips recess was designed with deliberate cam-out — the bit is intended to slip under excessive torque to prevent over-tightening. For production-line woodworking, this can be a liability: cam-out strips both the recess and the bit. The Pozi recess eliminates this by adding four secondary lobes at 45°, creating 8-point contact between bit and screw. The vertical walls of the Pozi recess further resist axial ejection of the bit under load.
For Tuyue's Pozi Drive Countersunk Chipboard Screw Type 17, the recess is machined to a deep profile, extending the available engagement depth and reducing cam-out probability even at high torque settings common in production furniture assembly.
Figure 2: The Pozi drive recess adds four secondary lobes at 45° to the standard cross, creating 8-point engagement that eliminates cam-out and extends bit life during high-volume chipboard assembly.
The head of a chipboard screw serves two functions: providing the bearing surface for the tool bit and seating flush or below the panel surface. A standard single countersunk head produces a flat conical underside. The double countersunk head — also called a double CSK or twin countersunk — adds a second, shallower countersink angle immediately beneath the head.
Tuyue's flagship chipboard screw combining Type 17 cutting point, deep Pozi recess, and double CSK head. Available in carbon steel and stainless steel, full thread or partial thread, multiple lengths.
Thread design is what separates a quality chipboard screw from a commodity fastener. Several geometric parameters define performance in engineered wood:
Chipboard screws use a coarse single-start thread with a high helix angle. The wide pitch between threads accommodates the larger inter-fiber gaps in particleboard and MDF, allowing the thread to bite into the resin-bound wood particles rather than sliding over them. Thread depth — measured from the root diameter to the crest — is typically deeper on chipboard screws than on equivalent machine screws, maximizing the shear area of each thread engagement.
Full-thread chipboard screws carry threading from the tip up to the underside of the head. This design maximizes pull-out resistance because every millimeter of the shaft contributes bearing load. It is ideal for single-panel applications — fastening a back panel, fixing a rail into chipboard, or securing shelf supports.
Partial thread (or twin-fast thread) leaves a smooth unthreaded shank zone below the head. When two panels are being joined, the smooth zone allows the top panel to be drawn tight against the lower panel as the thread pulls into it — eliminating the gap that full-threaded screws can leave between overlapping panels. For furniture carcass assembly and cabinet joining, partial-thread Type 17 screws deliver superior panel pull-together force.
Figure 3: Full-thread maximizes pull-out resistance in single boards. Partial-thread leaves a smooth shank zone that draws two panels together as the threaded section enters the lower panel.
Tuyue manufactures its chipboard screws from C1022A carbon steel wire, a medium-carbon alloy widely used in fastener cold-heading. The 0.18–0.23% carbon content provides an optimal balance: it is formable enough for high-speed cold-forging of the head and tip, yet hardenable to the tensile and torsional strengths required by DIN 7505 and comparable international standards.
After forming, screws undergo a quench-and-temper heat treatment. Quenching in oil or water raises core hardness through martensite formation. Tempering at controlled temperature then draws back brittleness, leaving a tough, impact-resistant core with a case hardness suitable for thread-forming in dense materials. Hardness targets are typically HRC 28–38 on the Rockwell C scale for the core, with thread flanks reaching slightly higher case hardness values.
For exterior applications, marine environments, or where contact with treated timber (ACQ or CCA lumber) is likely, Tuyue also offers the same Type 17 cutting point design in SS304 and SS316 stainless steel. SS304 provides excellent atmospheric corrosion resistance. SS316 adds molybdenum for superior resistance to chloride-induced pitting — critical in coastal construction or high-humidity industrial environments.
The standard surface finish is yellow chromate-passivated zinc electroplating. The zinc layer — typically 5–8 μm thick — provides cathodic (sacrificial) protection: zinc corrodes preferentially, protecting the steel substrate beneath. The yellow chromate conversion coating over the zinc layer seals the plating, blocks moisture ingress, and significantly extends corrosion resistance beyond bare zinc plating, achieving 72–120 hours of salt spray resistance per ASTM B117 testing.
| Parameter | Specification | Standard / Reference |
|---|---|---|
| Drive Type | Pozi Drive (Pozidriv) #1 / #2 / #3 | ISO 4757 |
| Head Style | Double Countersunk Flat Head (with nibs) | DIN 7505A / DIN 7505B |
| Point Type | Type 17 milled wood cutting point | ASME B18.6.1 |
| Thread Form | Coarse single-start chip-board thread | DIN 7505 |
| Thread Options | Full thread / Partial thread | — |
| Diameter Range | 3.0 mm – 6.0 mm | — |
| Length Range | 12 mm – 120 mm | — |
| Material | C1022A Carbon Steel / SS304 / SS316 | ASTM A108 / ASTM A276 |
| Heat Treatment | Quenched & Tempered, HRC 28–38 core | ISO 898-1 |
| Surface Finish | Yellow zinc passivated (std.) / White zinc / Black phosphate | ASTM B117 (salt spray) |
| Corrosion Resistance | ≥ 72 hours salt spray (zinc) · ≥ 500 hr (Geomet) | ASTM B117 |
| Torque (drive) | Per DIN 7505 min. prevailing torque | DIN 7505 |
| Min. Order Qty | 1,000 pieces (standard) · OEM cartons available | — |
The combination of Type 17 cutting tip, Pozi drive, and double-countersunk head makes this screw a versatile workhorse across multiple industries. Key application areas include:
Figure 4: Application map for the Type 17 Pozi Drive Chipboard Screw — from furniture flat-pack to structural timber and flooring installation.
Professional procurement requires documentary proof of compliance. Tuyue's chipboard screws are manufactured to the following key standards:
The German DIN 7505 standard is the primary European reference for chipboard screws. DIN 7505A covers the countersunk-head form, while DIN 7505B addresses raised countersunk (mushroom) head variants. Both specify thread pitch, diameter tolerances, hardness ranges, and pull-out test requirements specific to chipboard and engineered-wood substrates. Products conforming to DIN 7505 are accepted by building control authorities across the EU for structural timber connections documented in NTA 3128 and similar application guidelines.
Drive recess dimensions comply with ISO 4757 (Pozi drive). Tensile and mechanical property testing references ISO 898-1. Salt spray corrosion testing is conducted per ASTM B117. Material certification is issued as EN 10204 Type 3.1 for qualified orders, providing full traceability from raw steel coil to finished fastener.
All surface treatments applied at Tuyue comply with RoHS Directive 2011/65/EU (restriction of hazardous substances) and REACH Regulation (EC) 1907/2006. Hexavalent chromium (Cr VI) is not used in any passivation process, ensuring compliance with EU furniture and construction product chemical regulations.
One of the defining advantages of the Type 17 cutting point is that pre-drilling is optional in most chipboard and softwood applications. The cutting slot self-starts cleanly in material densities up to approximately 700 kg/m³. For dense hardwoods (oak, ash, beech) or when driving near board edges (within 1.5× the screw diameter), pilot drilling with a bit 0.5–1.0 mm smaller than the screw's root diameter is recommended.
Use a PZ2 bit for 3.5–4.5 mm diameter screws and a PZ3 bit for 5.0–6.0 mm. Ensure bit engagement depth is at least equal to the recess depth — a worn or undersized bit generates cam-out, damaging both the screw head and the panel surface. Set power tool torque clutch to approximately 15–25 Nm for standard 4.0 mm chipboard screws; reduce for thin or fragile panels.
Maintain a minimum edge distance of 5× the screw diameter from the panel edge. For chipboard flooring, screw spacing should not exceed 300 mm center-to-center on intermediate supports and 150 mm on supported edges, per BS 8201 and equivalent national standards for flooring construction.
