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Channel nuts feature cold-rolled zinc-plated or stainless steel coil springs welded to their rear surface. Regular spring nuts are specifically sized for standard 41×41mm (1-5/8" deep) channels, providing spring back-pressure to hold the nut in position vertically while bolts are threaded. Long spring nuts are designed for double deep or back-to-back channels (41×62mm or 41×82mm). No-spring or short-spring nuts are used in shallow 41×21mm channels where a standard spring would bottom out against the channel base before engaging the inward lips.

Yes. Our channels and fittings strictly follow the globally recognized MFMA-4 dimensional standard. Our accessories feature standardized 20.6mm (13/16") hole spacings, 53.5mm hole centers, and 14.3mm (9/16") hole diameters designed for standard M10, M12, 3/8", and 1/2" bolts. They integrate without modification into existing Unistrut®, B-Line®, Superstrut®, or generic 41mm strut framing installations.

Pull-out load resistance measures the vertical force required to deform the channel lips outward until the nut slips out, typically rated between 6.5 kN and 11.0 kN depending on channel gauge (2.5mm vs 1.5mm) and bolt diameter (M12 / 1/2"). Slip load resistance measures resistance against sliding down a vertical strut channel under load. Longitudinal slip load depends on the mechanical biting of case-hardened nut serrations and bolt installation torque (e.g., 68 Nm for 1/2" hardware yields ~4.5 kN to 6.0 kN slip resistance with a 3:1 engineering safety factor).

Electro-galvanizing deposits a smooth, bright zinc coating of 5 to 12 microns, which is ideal for dry indoor commercial spaces, computer server rooms, and standard clean environments (ISO 12944 C1-C2 categories). In contrast, Hot-Dip Galvanizing (HDG) immerses completed steel fittings in molten zinc at 450°C, forming a metallurgical alloy layer 65 to 100 microns thick. HDG is required for outdoor rooftop equipment racks, solar arrays, coastal installations, wastewater facilities, and heavy industrial plants exposed to atmospheric moisture and chemicals (C3-C5 corrosive categories).

Absolutely. Shanghai Qiongkai operates in-house tooling and die design shops. We manufacture customized multi-angle connection plates, seismic swivel hinges, bespoke cantilever arm lengths, and reinforced pipe clamps based on client CAD/BIM drawings. Custom part numbers, corporate branding logos, and load ratings can be coined or laser-etched directly onto bracket faces during stamping.

Every export consignment is accompanied by comprehensive documentation: Mill Test Certificates (MTC) conforming to EN 10204 Type 3.1 stating chemical melt composition and mechanical tensile results; third-party coating thickness inspection reports (HDG/Zinc); salt-spray test certificates (ASTM B117); container loading photographic logs; and Certificates of Origin (CO / Form E) for preferential customs duty treatment.