Rusan Screw for bases UNS 8-40 (L=6 mm)

• Correct thread specification: The UNS 8-40 thread pattern is made for compatible scope-mount bases, helping maintain proper fit and reducing the risk of thread mismatch during installation.
• 6 mm screw length: The 6 mm length suits base mounting where correct engagement matters, giving secure fastening without unnecessary protrusion.
• Mount-focused spare part: Built as a dedicated Rusan mounting accessory, this screw is a practical replacement for worn, lost or damaged base screws in scope-mount setups.
• Black finish: The black surface matches most mounts and hardware, keeping the installation visually discreet on hunting optics and rifle mounting systems.
• Simple service item: As a small but essential fastening component, it supports reliable maintenance of mounts and helps keep the optic-to-rifle interface properly secured.

About the Rusan Accessories Series

Rusan Accessories covers the supporting parts that keep the company’s mounting and adapter systems working as intended. The series is closely associated with Rusan-Mikron’s adapter and mounting ecosystem, which includes parts for attaching night-vision and thermal clip-on devices to riflescopes, as well as conventional and modular solutions for different rifle and optic combinations. A key idea behind the range is practical interchangeability: modular components allow one clip-on device to be shared across multiple rifles or paired with different riflescopes without replacing the entire setup.

Alongside the larger adapter bodies and rails, the series also includes small hardware, spare parts and accessory components that matter in day-to-day use. These parts support installation, replacement and upkeep of mounts and related systems, which is especially important when an optic setup must remain mechanically consistent after repeated handling. Within the broader Rusan lineup, the accessories range serves shooters who need dependable mounting support for hunting optics, thermal attachments and scope-mount assemblies, with an emphasis on compatibility, straightforward servicing and durable metal construction.

About the Rusan Screw for bases UNS 8-40 (L=6 mm)

The Rusan Screw for bases UNS 8-40 (L=6 mm) is a dedicated mounting accessory for scope-mount bases that use the UNS 8-40 thread standard. Although it is a simple component, it plays an important role in the overall stability of the optic mounting system. A correctly specified base screw helps the mount seat properly on the rifle, keeps fastening pressure where it belongs and supports consistent alignment between the base and the optic above it.

The 6 mm length is important in practice because base screws need enough thread engagement for secure retention while still matching the dimensions of the mounting interface. Using the correct screw size helps avoid common fitting problems such as shallow engagement, poor clamping or unnecessary protrusion. For shooters maintaining existing mounts, replacing lost hardware or keeping spare parts on hand, this Rusan screw is a straightforward way to preserve the integrity of a mounting setup.

Its black finish keeps the hardware visually unobtrusive and in line with the appearance of most modern mounts. As part of the Rusan mounting-accessory range, it is best suited to users who want a proper replacement part rather than a generic fastener, especially in rifle setups where secure optic mounting is essential for dependable field use.

About Rusan

Rusan-Mikron is a Croatian manufacturer based in Marija Bistrica, with roots in the Rusan family’s metalworking business dating to 1983. Željko Rusan opened a gunsmith shop in 1986, and the company began producing scope mounts in 1993. This background in gunsmithing and metalworking remains central to the brand’s focus on precisely made mounting components and related firearm accessories.

Today, Rusan produces scope mounts, scope rings, Picatinny rails and firearm tuning products, and it is also well known for adapters for night-vision and thermal-imaging devices. The company introduced its clip-on sight adapter clamp in 2009, a product area that became an important part of its international profile. That combination of traditional mount-making and practical adapter design makes Rusan especially relevant in the field of hunting optics and mounting systems.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Accessory type: Screw for bases
• Thread: UNS 8-40
• Length: 6 mm
• Accessories for: Mounts
• Color: Black

Warranty

This Rusan mounting accessory is covered by a 2-year warranty, providing defined manufacturer support for this component.