Rusan M49x0.75 Counter Nut with set screw

• Secure locking ring: The counter nut helps lock a compatible thermal clip-on adapter in place, reducing the chance of unwanted movement once the setup is aligned on the riflescope.
• Integrated set screw: The set screw adds a positive hold, which is useful when a clip-on system needs to stay fixed during repeated mounting, removal, or field use.
• M49x0.75 thread format: This thread specification is intended for matching compatible Rusan adapter components, helping maintain a precise mechanical fit within the mounting system.
• Built for clip-on systems: Designed as an accessory for thermal clip-on equipment, it supports a more stable and repeatable connection between adapter parts.
• Compact metal accessory: Its small, purpose-built form adds the needed locking function without unnecessarily increasing the bulk of the overall clip-on setup.

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 includes adapters, reduction rings, spare parts, and other small but important components that help configure a clip-on setup correctly for a specific riflescope or host platform. A key idea behind the range is flexibility: Rusan offers both conventional and modular adapter systems, allowing one clip-on device to be shared across multiple rifles or matched with different optics through the correct intermediate parts.

The series is especially relevant to users who need a dependable mechanical interface rather than a one-piece fixed solution. Rusan brought its original clip-on adapter to the global market in 2009, and later developed a modular adapter concept that remains central to the lineup. In practice, the Accessories series is defined by precise thread standards, compatibility-focused design, and a broad selection of parts that let hunters and other clip-on users fine-tune how a thermal or night-vision device mounts in front of the day optic.

About the Rusan M49x0.75 Counter Nut with set screw

The Rusan M49x0.75 Counter Nut with set screw is a small but important fitting for a thermal clip-on mounting system. Its job is to secure and stabilize compatible threaded adapter components, helping the assembled interface stay properly positioned once the clip-on device has been fitted. In a clip-on setup, even a minor amount of unwanted rotation can affect alignment and handling, so a dedicated locking part like this contributes to a more dependable overall installation.

The M49x0.75 thread specification makes this accessory suitable for matching components built around that exact thread standard. The addition of a set screw gives the counter nut a more positive locking function than a simple threaded ring alone, which is useful when the adapter may be exposed to repeated mounting cycles, transport, or recoil-related movement in normal field use. Its black finish keeps the appearance consistent with typical adapter hardware, while the compact form means it performs its function without adding unnecessary size to the front-mounted clip-on assembly.

For users building or maintaining a Rusan clip-on adapter system, this accessory is primarily about mechanical security and repeatable positioning. It is not a general-purpose fitting, but a purpose-made part for keeping a compatible adapter arrangement properly locked and ready for use.

About Rusan

Rusan is a Croatian manufacturer with roots in the Rusan family’s metalworking business, which dates to 1983. The company, Rusan-Mikron, is based in Marija Bistrica, Croatia, and developed from gunsmithing and precision metalworking into a specialist maker of firearms mounting solutions. Rusan began producing scope mounts in 1993, and its range now includes scope mounts, rings, Picatinny rails, and firearm tuning products.

The brand is particularly well known for adapter systems used with night-vision and thermal-imaging devices. It introduced its clip-on sight adapter clamp in 2009, reflecting a strong focus on practical mounting solutions for modern hunting optics and observation equipment. That background in precision-machined interfaces is directly relevant to small system parts such as adapter nuts, rings, and locking components, where fit and consistency matter as much as they do in larger mounts.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Made in: Croatia
• Accessory type: Counter nut with set screw
• Thread: M49x0.75
• Compatible with: Thermal Clip-on
• Color: Black

Warranty

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