Rusan adapter main screw (M5x22 left thread)

• Purpose-built spare part: This main screw is made for Rusan thermal clip-on adapters, helping restore the original fit and function of the mounting system without changing the adapter setup.
• Left-thread design: The M5x22 left thread configuration matches the intended fastening direction, which is important for correct installation and secure operation on compatible clip-on assemblies.
• Compact and practical: As a small replacement component, it is useful for maintenance, repair, or keeping a spare on hand for field equipment that sees regular mounting and removal.
• Made for demanding use: Built by Rusan and finished in black, it suits the robust, low-profile design language typical of hunting optics and thermal clip-on accessories.

About the Rusan Accessories Series

Rusan Accessories covers the supporting parts that keep the company’s mounting and adapter systems working as intended, with a strong focus on equipment for night-vision and thermal clip-on devices. The series includes adapters, reduction rings, accessory parts, and other components used to connect clip-on units to riflescopes in a secure and repeatable way. Within Rusan’s wider lineup, these products sit alongside scope mounts, rings, and rail systems, reflecting the company’s practical approach to firearm and optic integration.

A defining trait of the series is its emphasis on modularity and compatibility. Rusan developed its adapter systems so one clip-on device can be shared across multiple rifles or paired with different riflescopes through the correct interface parts. That makes the series relevant not only for complete adapter assemblies, but also for small replacement items that help maintain the original performance of the system. For users of thermal clip-on equipment, these accessories support reliable attachment, consistent alignment, and straightforward upkeep of field-used mounting hardware.

About the Rusan adapter main screw (M5x22 left thread)

The Rusan adapter main screw (M5x22 left thread) is a dedicated replacement part for a thermal clip-on adapter system. Its role is simple but important: it helps the adapter assembly retain the correct mechanical connection so the clip-on setup can continue to function as intended. On systems that are mounted, removed, and adjusted repeatedly, small hardware parts matter because they directly affect how securely the adapter closes and how consistently it returns to position.

The key detail here is the M5x22 left-thread format. This is not a generic screw chosen by size alone; the thread direction is part of the intended design, so using the correct part helps preserve proper engagement and avoids mismatched fastening behavior. In practical use, that matters for maintenance and repair, especially on clip-on equipment where dependable clamping and repeatable assembly are more important than cosmetic details.

Finished in black and made by Rusan in Croatia, this accessory suits users who want to keep an existing adapter in service with the proper original-style component. For hunters and shooters relying on thermal clip-on optics, a correct replacement screw is a straightforward way to maintain the adapter’s usability without replacing the complete unit.

About Rusan

Rusan-Mikron is a Croatian manufacturer based in Marija Bistrica, and the Rusan family’s metalworking business dates to 1983. The company’s background is closely tied to gunsmithing and precision metalwork; Željko Rusan opened a gunsmith shop in 1986, and the business began producing scope mounts in 1993. That manufacturing history is directly relevant to products such as adapter hardware, rings, and mounting interfaces, where machining accuracy and dependable fit are essential.

Rusan is known for producing scope mounts, scope rings, Picatinny rails, and firearm tuning products, as well as adapter systems for night-vision and thermal-imaging devices. The company introduced its clip-on sight adapter clamp in 2009, a milestone that helped establish its reputation in the field of clip-on optic attachment solutions. Today, Rusan’s product range remains focused on practical mounting components designed for real firearm and optics use.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Product type: Accessory
• Compatibility: Thermal Clip-on
• Thread: M5x22 left thread
• Color: Black
• Made in: Croatia

Warranty

2 years. This accessory is covered by a 2-year warranty.