Rusan Thread Adapter M46 to M52 for Thermal Scopes
By Professor Optiken - Zieloptiken, Ferngläser & Reflexvisiere | Published: 2026-10-19
Category: Buying Guides
Learn when the Rusan M46x0.75 to M52x0.75 thread adapter is the right choice for connecting Nitehog or Lahoux front attachments to standard scope mounts, and when it is not.
Quick answer
The Rusan thread adapter M46x0.75 to M52x0.75 lets you mount Nitehog or Lahoux front attachments with an M46x0.75 external thread into standard Rusan clamp adapters that have an M52x0.75 internal thread.
Why thread pitch matters
Thermal and night vision front attachments often use fine metric threads to ensure secure, repeatable alignment. The M46x0.75 designation means a 46 mm diameter with a 0.75 mm pitch. Using the wrong pitch can cross-thread the adapter or damage the device housing.
The Rusan adapter ring preserves the exact 0.75 mm pitch on both ends, so the connection stays tight without additional shims or modification.
Trade-off: added length and stack height
Every adapter ring adds a few millimeters to the overall optical length. This can shift the balance point on a rifle or affect eye relief when used with a clip-on system. Measure your available rail space and clearance before ordering.
The ring itself is compact, but the combination of a clamp adapter plus the thread adapter may push the front attachment farther forward than a direct-thread solution.
Decision rules for the Rusan M46 to M52 adapter
- Check your device thread: Measure the external thread on your Nitehog or Lahoux front attachment. If it is M46x0.75, this ring fits. If the thread is a different diameter or pitch, you need a different adapter.
- Confirm your clamp adapter thread: The ring requires a Rusan clamp adapter with M52x0.75 internal thread. If your clamp uses a different internal thread (e.g., M48 or M50), the ring will not thread in.
- Account for added length: The ring adds roughly 5 mm to the optical stack. Verify that your rail has enough space and that the front attachment still clears the handguard or barrel. If space is tight, consider a direct-thread adapter that skips the clamp step.
Product facts
- Professor Optiken Gewindering M46x0,75 mm auf M52x0,75 mm (Nitehog, Lahoux): The Professor Optiken Gewindering has M46x0.75 external thread and fits into clamp adapters with M52x0.75 internal thread, compatible with Nitehog and Lahoux front attachments. It converts the standard clamp adapter to accept devices that use the less common M46 thread, so you don't need a dedicated clamp for each thread size.
Professor Optiken Gewindering M46x0,75 mm auf M52x0,75 mm (Nitehog, Lahoux)
Who should use this adapter
Best for
- Shooters who already own a Rusan clamp adapter with M52x0.75 internal thread and want to attach a Nitehog or Lahoux device
- Users who need to switch between multiple front attachments with different thread sizes without buying separate clamps
Not ideal for
- Anyone whose front attachment uses a thread other than M46x0.75
- Users who want the shortest possible optical length and can use a dedicated direct-thread adapter
