2026-08-31
Within the photovoltaic mounting system, PV clamps are critical accessories for securing solar modules, categorized into mid‑clamps and end‑clamps. As a professional manufacturer of PV mounting structures and accessories, Zhongtang Group elaborates on core selection parameters and common procurement pitfalls for overseas buyers, assisting clients in sourcing reliable, well‑matched clamp products.
PV clamps fasten solar module frames onto mounting rails via bolt pre‑tension, preventing module displacement or detachment under wind loads. Manufactured from 6063‑T5 aluminum alloy with anodized surface finishing, Zhongtang PV clamps feature light weight, superior corrosion resistance and favorable elasticity, compatible with frame dimensions of most mainstream solar modules.
Mid‑clamps serve to connect and fix two adjacent modules, while end‑clamps secure the outermost side of modules at the edge of the array. Zhongtang supplies PV clamps covering frame‑thickness specifications of 30 mm, 35 mm, 40 mm and more, with custom solutions available against clients’ module models. During procurement, first confirm the module frame thickness to select clamps with matching opening dimensions. Excessively large openings lead to insufficient clamping force; undersized openings cause installation failure or frame crushing. Zhongtang recommends clients share module part numbers or frame section drawings prior to purchase for technical validation of proper clamp specifications.
Bolt configuration represents another key procurement consideration. Zhongtang PV clamps are paired with 304 stainless‑steel bolts and nuts, delivering outstanding rust resistance for diverse outdoor conditions. Bolt length shall be properly selected according to clamp height and rail groove depth: too‑short bolts result in insufficient thread engagement, whereas overly long bolts create unsightly protrusions and potential safety hazards. All Zhongtang PV clamps come pre‑fitted with properly sized bolts for direct on‑site installation without extra component sourcing.
For bulk orders, Zhongtang reminds buyers to inspect surface finish and dimensional consistency. Low‑grade clamps may carry burrs, cracks or uneven anodic films, hampering installation efficiency and risking fracture over long‑term service. Produced on automated production lines, Zhongtang clamps maintain dimensional accuracy within ±0.1 mm. Every batch undergoes hardness testing and salt‑spray testing to guarantee consistent quality. Matching‑ratio packaging for mid‑clamps and end‑clamps is also available, shipped according to project requirements to facilitate field construction.
