Rusan adapter locking screw (M4x5)

• Purpose-built spare part: This M4x5 locking screw is made for Rusan thermal clip-on adapters, helping restore secure clamping and proper retention without replacing the full adapter.
• Compact, exact fit: A small fastening part matters in daily use because the correct screw size supports consistent assembly and helps the adapter lock up as intended.
• Made by Rusan: As an original Rusan accessory, it matches the company’s adapter system and is a sensible choice when maintaining compatible clip-on mounting hardware.
• Black finish: The black exterior keeps the part visually discreet on hunting optics and clip-on equipment while fitting the look of surrounding hardware.
• Croatian manufacture: Produced in Croatia, this accessory comes from the same manufacturing background as Rusan’s mounts, rails and adapter components.

About the Rusan Accessories Series

Rusan Accessories is the support range behind the company’s mounting and adapter systems for night-vision and thermal clip-on devices. The series is built around practical parts that keep clip-on equipment adaptable, serviceable and easy to configure for different riflescope and device combinations. A central idea in the range is modularity: Rusan developed accessories and reduction components so one clip-on unit can be matched with multiple rifles or different optics setups without replacing every major part.

Within the broader Rusan lineup, this series sits alongside the company’s mounts, rings and rails, but focuses more directly on the small components that make adapter systems work reliably in the field. It includes dedicated accessories, spare parts and adapter-related hardware for both conventional and modular systems. That makes the series especially relevant for users who rely on clip-on thermal or night-vision equipment and want to maintain a secure, repeatable connection between the device and the riflescope.

About the Rusan adapter locking screw (M4x5)

The Rusan adapter locking screw (M4x5) is a small but important accessory for maintaining a thermal clip-on adapter in proper working order. On an adapter system, the locking screw contributes to the secure engagement of the mechanism, so replacing a worn, damaged or missing part can be the difference between a setup that feels uncertain and one that locks together correctly. For users who depend on clip-on equipment, that kind of basic hardware matters because it supports consistent mounting and helps preserve the intended fit of the adapter assembly.

This model is defined by its M4x5 format, making it suitable where that exact screw size is required in the Rusan system. Rather than being a generic workshop fastener, it is best understood as a dedicated adapter spare part for keeping compatible hardware complete and functional. The black finish gives it a subdued appearance that blends with surrounding adapter components, while the compact design suits the tight spaces typical of clip-on mounting hardware. For owners of Rusan thermal clip-on accessories, this screw is a straightforward maintenance item that helps extend the service life of the adapter and keeps the mounting system ready for regular field use.

About Rusan

Rusan comes from a family metalworking background that dates to 1983, and the company’s firearms-related work expanded when scope mount production began in 1993. Based in Marija Bistrica, Croatia, Rusan-Mikron focuses on precision-made mounting solutions and related components for sporting and hunting firearms. Its range includes scope mounts, rings, Picatinny rails and firearm tuning products, alongside the adapter systems for night-vision and thermal devices that made the brand widely known in this category.

A key part of Rusan’s reputation is its work on clip-on interfaces. The company introduced its clip-on sight adapter clamp in 2009, establishing a product family that remains closely associated with thermal and night-vision attachment systems. That background is directly relevant here: even a small accessory such as a locking screw belongs to a product ecosystem built around precise fit, repeatable attachment and compatibility with modern clip-on optics.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Made in: Croatia
• Accessory for: Thermal Clip-on
• Color: Black

Warranty

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