Engineering Library
Choosing Roofing Screws for Solar: Coating Class vs Corrosion Environment
The cheapest components in a rooftop solar system are also its most numerous corrosion points. A 100 kW metal-roof install can put over a…
Resources
Technical articles, buyer guides, installation guides, material and corrosion references, downloads and warranty terms — written to speed up mounting decisions.
Engineering Library
Why 304 Stainless Fasteners Can Be Slightly Magnetic — and Why That Is Not a Defect
A container of A2-70 stainless bolts arrives, someone touches a magnet to one, it sticks — faintly, but it sticks — and a quality…
Resource
Material Certification — SS304 A2-70 Fasteners to ISO 3506-1 (2025)
Batch quality certificate for SS304 (A2-70) DIN 912 hex socket head cap screws (M8×1.25×25): mechanical properties to ISO 3506-1:2020 — yield strength 584 N/mm²…
Downloads
Corrosion Protection Guide — ISO 12944 / 1461 / 7599 & Fasteners (2026)
23-page engineering reference for specifying corrosion protection on solar mounting structures: aluminium anodizing classes by C1–CX corrosivity category (ISO 7599 / QUALANOD), hot-dip galvanizing…
Resource
Salt Spray 1,000 h — Coated Roofing Screw, No Red Rust (SGS, 2022)
Neutral salt spray test to ASTM B117 (5% NaCl, 35 °C, 1,000 hours) of coated SUS410 hex-washer roofing screws (6.3-10×80) by SGS-CSTC: no visible…
Resource
Pull-Out Test — Self-Tapping Screw ST6.3×80 (SGS, 2021)
Pull-out testing of the ST6.3×80 mm self-tapping screw by SGS-CSTC Xiamen: maximum force 3,130 N in 2.5 mm steel plate and 3,206 N in…
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Compression Test — Punched Aluminum Walkway SR-AWP, 3,101 N (SGS, 2024)
Compression test of the SR-AWP punched (anti-slip) aluminum walkway over a 1,200 mm span by SGS-CSTC Xiamen: maximum force 3,101 N. Report XMIN2312003120ML01, January…
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Compression Test — Aluminum Walkway SR-AWC, 5,599 N (SGS, 2024)
Three-point compression test of the SR-AWC aluminum checker-plate walkway over a 1,000 mm span by SGS-CSTC Xiamen: maximum force 5,599 N. Report XMIN2312003120ML02, January…
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Compression Test — HDG Steel Grating SR-HWG, 7,317 N (SGS, 2024)
Compression test of the SR-HWG hot-dip galvanized steel walkway grating (3000×350×30 mm) over a 1,500 mm support span by SGS-CSTC Xiamen: maximum force 7,317…
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Pull Test — Clamp Rail SR-C406Y, 2,933 N (SGS, 2024)
Tensile pull test to destruction of the SR-C406Y clamp rail (100 mm sample, aluminum 6005-T5) by SGS-CSTC Xiamen: maximum force 2,933 N. Report XMIN2403000515ML02,…
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Pull Test — Kalzip Clamp SR-CKZ, 2.71 kN (SGS, 2025)
Tensile pull test to destruction of the SR-CKZ clamp for Kalzip-type round standing seam roofs (50 mm sample, aluminum 6005-T5, installation torque 15 N·m)…
Downloads
Pull-Out Test — L Bracket SR-LM, mean 6.1 kN (SGS, 2019)
Pull-out testing of the SR-LM L bracket (L-foot) fixing a rail, five samples, by SGS-CSTC Xiamen: maximum forces 5,713–6,601 N, mean approximately 6.1 kN,…
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