Why is our patented SKT® II Super Screw without Type 17 superior to regular decking screws with Type 17?

This R&D testing report compares Taiwan Shan Yin patented SKT® II Super Screw with regular decking screws in wood crack performance and drilling-in torque. The test helps evaluate how screw design affects wood splitting, drilling resistance, installation efficiency, and fastening performance in oak wood and beech hardwood applications.

The comparison includes regular decking screws with and without Type 17 point, and SKT® II Super Screws with and without Type 17 point. The purpose is to understand whether Type 17 point design improves drilling performance, and whether SKT® II Super Screw can provide better fastening results than regular decking screws.

Test Screw Size and Samples

• Testing screw size: #9 x 3"
• A: Regular decking screw without Type 17, Green Ruspert coating
• B: Regular decking screw with Type 17, Green Ruspert coating
• C: SKT® II Super Screw without Type 17, Silver SKT® Coating
• D: SKT® II Super Screw with Type 17, Silver SKT® Coating

Wood Crack Test

The wood crack test was conducted on oak wood and beech hardwood near the wood edge. The test compares the cracking condition after screws are installed into hardwood, which is an important factor for decking screws, wood screws, construction screws, and fastening applications where wood splitting must be controlled.

• Regular decking screws showed slight to serious wood cracks during the test.
• SKT® II Super Screws, with or without Type 17, showed better wood crack performance than regular decking screws.
• The test observation showed no visible wood crack around the SKT® II Super Screw samples in the demonstrated result.

Drilling-In Torque Test

The drilling-in torque test was performed with SCHATZ drilling-in torsional equipment. Screws were drilled into oak wood to read torsional values. In this test, lower torque values indicate lower drilling resistance and better effort-saving performance during installation.

• Torsional equipment: SCHATZ drilling-in torsional reader
• Wood material: Oak wood
• Test method: Drill screws into oak wood and read torsional values. Lower values indicate better drilling performance.
• Unit: LBS-IN

Average Drilling-In Torque Result

Test Comments

• The test result showed no obvious benefit in drilling-in torque reduction for SKT® II Super Screws with Type 17 compared with SKT® II Super Screws without Type 17.
• SKT® II Super Screws had lower drilling-in torque than regular decking screws, helping reduce drilling power during installation.
• Based on the average torque values, SKT® II Super Screws showed approximately 40% effort-saving performance compared with regular decking screws.
• In the wood crack test, SKT® II Super Screws with or without Type 17 showed better wood crack performance than regular decking screws.

This testing report demonstrates Taiwan Shan Yin's R&D testing capability for patented screws, decking screws, wood screws, and construction fastening applications. Through wood crack testing and drilling-in torque comparison, international buyers can better understand how screw design, point type, thread structure, and coating selection may affect installation performance.