C-type double offset ring spanner

As a China sourcing agent for hardware tools,Falvrco offer C-type double offset ring spanner

Core Parameters of C-type Double Offset Ring Spanner

1. Basic Structural Parameters

‌Inner hole structure‌: Formed by two concentric regular hexagons offset by 30°, with a 12-faced inner wall. The double offset design further optimizes the torque transmission path, preventing the bolt from slipping and damaging the corners of the bolt head.

‌Offset angle‌: The common bend angle ranges from ‌10° to 45°‌. The bolt-engaging part is misaligned with the handle, which adapts to operations in recessed spaces and reserves an operating gap for fingers to avoid abrasion.

2. Specification & Material Parameters

‌Standard sizes‌: Covers a full range of metric across-flat dimensions from 17mm to 100mm, and custom imperial sizes are also available. Some models provide VDE insulated versions.

‌Main material‌: Conventional models are integrally forged from medium carbon steel 45 or 40Cr alloy steel; explosion-proof models adopt beryllium bronze/aluminum bronze alloy; 304 stainless steel versions are suitable for high-corrosion and high-frequency operation scenarios.

3. Performance & Standard Parameters

‌Torque feature‌: The double offset structure amplifies torque through axis misalignment, which can output large torque without extending the handle, complying with the current national standards GB/T 4388-2008 and GB/T 4392-2019.

‌Surface treatment‌: Most products adopt cold forging + black oxide anti-rust process, while high-end models add chemical polishing treatment for significantly improved surface precision and durability.

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