Rusan Q-R adapter M52x0.75 for Ø38 mm (ARM52-38)

What it is and what it is for

The Rusan ARM52-38 is a quick-release clamping adapter designed to allow mounting of night-vision and thermal devices with an M52x0.75 thread onto the objective or eyepiece of a day sight. It provides a mechanical interface for installing clip-on/thermal units securely and repeatably.

Main characteristics

The mechanical interface is an M52 x 0.75 thread and the ARM52-38 variant corresponds to a 38 mm diameter. The adapter is made of aircraft aluminium. According to the manufacturer's size table, the typical total length for ARM52 models, including the ARM52-38, is approximately 48 mm and the clamping length is approximately 37 mm; manufacturing tolerance is ±0.2 mm. The official weight listed is 0.164 kg.

Compatibility

This adapter is intended for devices using an M52x0.75 thread; the catalog lists compatible examples such as Dedal models 540/541/542/546/552, Jahnke DJ-8 NSV and Lahoux D-545, LV-81. Reducer ring codes are available to adapt other threads (for example APS22, APS28, ADN33, ADFA75, AF135-F155, ATIR-M35, ATA435) as required for mounting.

Additional notes

The ARM52 series was tested for stability with high-power calibers (.338 Lapua Magnum and .416 TYR). The suffix “-38” in ARM52-38 denotes the 38 mm diameter. The consulted sources do not specify which accessories, if any, are included in the product packaging; any additional items should be confirmed separately.