CORROSHIELD® Fasteners BIMATAPP®
Fix profiled metal roofing sheets to thin-walled steel purlins with confidence. BIMATAPP® combines a stainless steel self tapping screws for aluminum compatible stainless steel shank (SS304/SS316) with a carbon steel drill point for faster drilling performance and strong corrosion resistance where it matters. As a purpose-built solution among bi-metal fasteners, BIMATAPP® is engineered for demanding outdoor roofing and cladding environments where conventional self tapping bolts for aluminum and steel interfaces fall short. Designed as reliable bi-metal self drilling screws, BIMATAPP® delivers the strength needed to bolt aluminum to steel with precision and long-term durability.
Specification
Material: SS304/316 + Carbon Steel Drill Point
Head: Hex Washer Head
Washer Type: Stainless Steel Bonded EPDM Washer
Thread: Full Thread / Double Thread (variant-based)
Drilling Capacity: Up to 5.5mm or 12.5mm steel (variant-based)
What Are Bi-Metal Self Drilling Screws & How Does BIMATAPP® Work?
BIMATAPP® is a bi-metal roofing screw system designed for fixing profiled roofing sheets to thin-walled steel purlins. As a bi-metal self drilling screw, the construction combines:
a stainless steel shank (for corrosion resistance and long-term durability), and
a carbon steel drill point (for drilling performance into steel substrates).
BIMATAPP®’s dual-material design eliminates the trade-off between corrosion resistance and drill-point hardness, outperforming standard stainless steel self-tapping screws across aluminum and steel substrates. It delivers reliable performance whether bolting aluminum to steel cladding frames or securing profiled sheets in composite panel systems. The result is consistent holding, weather-tight sealing, and long-term corrosion protection in demanding outdoor environments.
Where BIMATAPP® is Used?
Use-case:
/1
Fixing profiled metal roofing sheets to thin-walled steel purlins, the core application for bi-metal self drilling screws across PEB, industrial, and commercial roofing projects
/2
Roofing and cladding work where weather sealing and corrosion resistance are critical, including projects specifying self tapping stainless steel screws for aluminum cladding panels in coastal or high-humidity environments
/3
Self-drilling screws requiring bonded EPDM sealing under the head for water-tightness, where bi-metal screws outperform single-material fasteners and standard self tapping bolts for aluminum in joint integrity and long-term seal performance
Optional “Common sectors”:
Pre-Engineered Buildings (PEB), Factories, Manufacturing plants, Warehouses, Solar mounting structures, Cold rooms, Food processing plants, Coastal industrial buildings, Airport hangars, Metro stations, Railway platform shelters
Quality Checks That Support Consistent Performance
For critical construction fasteners, consistency matters across lots. Our supply chain emphasizes verification and testing practices such as:
Corrosion resistance testing
Hardness testing
Positive Material Identification (PMI)
Precision dimensional & profile checks
How to Choose the Right Self Tapping Bolts for Aluminum & Steel Interfaces
Confirm substrate thickness (steel purlin): choose drilling capacity option (up to 5.5mm vs up to 12.5mm).
Calculate clamp thickness: include sheet, insulation/blanket (if any), spacer requirements, and base sheet layers.
Choose length (L): ensure sufficient thread extension beyond the substrate (selection principle aligned to clamp note).
Use washer correctly: bonded EPDM washer must be correctly driven to seal without over-compression.
BIMATAPP® Bi-Metal Screws Installation Guide for Roofing & Cladding
Correct installation improves water-tightness and long-term performance.
3 callouts
Under-driven: may reduce sealing and holding performance
Correctly driven: washer seated properly for reliable seal
Over-driven: may damage washer and increase leakage risk
Get Pricing & Technical Support for BIMATAPP®
Frequently asked questions
It refers to the combination of a stainless steel shank with a carbon steel drill point, designed to balance corrosion resistance with drilling performance.
Yes, BIMATAPP® includes LEVIN® drill point variants with drilling capacity options up to 5.5mm or 12.5mm steel, depending on the variant.
BIMATAPP® is built for roofing applications and includes bonded EPDM washer options to support weather sealing.
Length depends on total clamp thickness (sheet + insulation + supports). Share your stack-up and substrate thickness for the correct recommendation.
