Hobson performance data
Type 17 Washer Head Timber Screw, 18 Gauge Torx Drive: Performance Data
A two-page product data sheet for the DrillX Type 17 washer head self-drilling timber construction screw, 18 gauge with a Torx drive, part T9PWTGO1805. It gives pullout values, mechanical properties, the six lengths and the installation guide.
What this covers
- Applications
- Pullout values
- Mechanical properties
- Sizes and part numbers
- Installation
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- For connecting heavy duty treated timber to timber, for example outdoor pergolas, retaining walls, fencing and gates.
- 18 gauge, 5 TPI, 19mm washer head, T40 Torx drive. Six lengths: 75mm (38mm thread), 100mm (60mm thread), and 125, 150, 200 and 250mm (70mm thread). Part numbers T9PWTGO1805075 to T9PWTGO1805250.
- C1022 hardened steel with a Tykote coating, formulated to resist treated pine chemicals.
- Pullout working load (factor of safety 2.5 for timber included): 1,940N with 29mm of thread embedded, 7,050N with 56mm embedded. These are laboratory values and the sheet does not name the timber used.
- Characteristic tensile strength 23,600N and characteristic shear strength 12,900N (95% of screws expected to exceed these). These are not working loads.
- Drive with a cordless screwdriver set at a maximum of 2,200 to 3,000 RPM using a T40 bit, with firm, steady pressure. Do not over-tighten. Impact drivers are not recommended.
Who it helps: Builders and landscapers fixing treated timber for pergolas, retaining walls, fences and gates.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.