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Timco Heavy Section Self-Drilling Screws 5.5 x 38mm - Steel Cladding Fixings
Timco Heavy Section Self-Drilling Screws 5.5 x 38mm - Steel Cladding Fixings
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Engineered for direct fastening into heavy structural steelwork up to 12mm thick without pilot drilling.
A great choice if you are looking to secure profile sheeting, roofing panels, or brackets directly to heavy steel sections. Equipped with a specialised No. 5 drill tip, a vulcanised 16mm EPDM washer, and a 500-hour salt-spray protective finish, these hard-wearing fasteners provide a dependable, weather-tight hold across demanding agricultural and industrial builds.
Why Choose Sammie’s TIMCO Heavy Section Screws?
- Direct Heavy-Steel Drilling: Fitted with an extended 15mm No. 5 drill tip that effortlessly bores through structural steel purlins and hot-rolled beams up to 12mm thick, saving valuable time on site.
- Dependable Weatherproof Compression: The vulcanised 16mm EPDM washer compresses cleanly against cladding profiles, creating an airtight, watertight seal that stops rainwater ingress at the fixing point.
- Reduced Insertion Torque: Engineered with metric V flutes and a torque-relieving slash along the thread, minimising friction and driving effort to prevent screw binding, sheared heads, or tool strain.
- Tested Corrosion Defence: Finished in a resilient silver organic exterior plating tested to withstand 500 hours of salt spray, offering Class 3 exterior durability in rural, industrial, and coastal-adjacent settings.
- Firm Hex Socket Grip: The flanged 8mm hexagonal head ensures a tight, slip-resistant engagement with standard nut setters, providing maximum driver stability when working at height or under load.
Technical Specification
| Brand | TIMCO |
| Product Type | Heavy Section Self-Drilling Screw (Tek Screw) |
| Dimensions (Gauge x Length) | 5.5 x 38mm (12 Gauge) |
| Point Type & Drill Tip Length | Self-Drilling No. 5 (15mm Drill Tip) |
| Maximum Drilling Thickness (MDT) | Up to 12.0mm Heavy Section Steel |
| Effective Thread Length | 16mm (Fully Threaded) |
| Thread Geometry | Metric with V Flutes & Torque-Relieving Slash |
| Head Type & Dimensions | Flanged Hexagon (12mm Flange Diameter, 5.6mm Height) |
| Drive Method | 8mm (5/16") Hexagonal Socket |
| Washer Specification | 16mm Bonded EPDM Vulcanised Rubber Washer |
| Core Material | Case & Core-Hardened Carbon Steel |
| Finish & Plating | Silver Organic Exterior Plating (500 Hours Salt-Spray Tested) |
| Corrosion Rating | Rating 3 (Urban and industrial areas with a low-salt atmosphere) |
| Standard Compliance | BS EN 10666 / DIN 7504 |
| Compatible Substrates | Heavy Section Steel, Hot-Rolled RSJs, Structural Purlins |
| Pack Quantity & Type | 100 Pieces per Box (0.76kg) |
| Pack Dimensions | 140 x 92 x 60mm |
SKU: SX-H38W16B
MPN: H38W16B
ID: 37800
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