Choosing the Right Rusan Adapter for a HIKMICRO Thunder Clip-On

The HIKMICRO Thunder is one of the most popular thermal clip-ons in Australia — but it doesn't ship ready to bolt onto your rifle. It needs a Rusan adapter matched to your day scope, and picking the right one comes down to a single measurement. This guide shows you exactly how to choose.

Quick answer

A HIKMICRO Thunder clip-on mounts to your day scope through a Rusan adapter sized to your scope's objective housing diameter. Measure the outside diameter of your day scope's objective bell, then pick the matching Rusan adapter — available for the Thunder in 42, 47, 48, 57, 59, 60, 61 and 62mm. Add a Rusan Direct Thread or Modular clamp to connect it to the Thunder's rear thread, and choose a quick-release version so you can remove the clip-on without losing your zero.

How the Thunder mounts

The Thunder sits in front of your day scope and feeds it a thermal image that the scope magnifies optically — so your rifle's zero stays with the day scope. The mounting job is to hold the Thunder concentric with the scope's optical axis, and that's what the Rusan adapter does. Two elements make the connection:

• The rear thread interface — the Thunder's back carries an M52×0.75 thread; a Rusan Clip-On Direct Thread Clamp or Modular Adapter Clamp screws to it.
• The objective ring — clamps over your day scope's objective housing. This is the part that must match your scope, and it's why the adapters come in different millimetre sizes.

Step 1 — Measure your day scope's objective

Using vernier calipers, measure the outside diameter of the objective housing — the metal bell around the front lens of your day scope, not the glass itself. That figure in millimetres is what you match the adapter to. Most hunting scopes land somewhere in the 42–62mm range the Thunder adapters cover.

Step 2 — Match the Rusan adapter

Pick the Rusan adapter that matches your measured diameter:

If your measurement falls between two listed sizes, choose the next size up and use the adapter's clamping range, or contact us with your scope model and we'll confirm the fit. A wrong size is the most common reason a clip-on won't hold alignment.

Step 3 — Choose your clamp and quick-release

To connect the adapter to the Thunder you'll use a Rusan clamp on the M52×0.75 rear thread — the Direct Thread Clamp is the straightforward option, while the Modular Adapter Clamp and connector suit hunters running the clip-on across more than one setup. For removing and refitting the Thunder without disturbing your zero, the Rusan Q-R one-piece quick-release adapter for the HIKMICRO Thunder is the cleanest solution — it indexes back to the same position every time.

Want to use the Thunder handheld?

A Rusan monocular adapter threads onto the Thunder and turns it into a handheld thermal spotter, so the one device scans on foot and clips onto the rifle for the shot — a popular way to get two tools out of one purchase.

FAQ

Which Rusan adapter do I need for my HIKMICRO Thunder?

The one that matches the outside diameter of your day scope's objective housing. Measure it with calipers and pick from the Thunder range — 42, 47, 48, 57, 59, 60, 61 or 62mm. If you're unsure, send us your scope model.

What thread does the HIKMICRO Thunder use?

An M52×0.75 rear thread, which the Rusan Direct Thread and Modular clamps connect to. The objective-side adapter is what varies with your scope.

Will fitting the Thunder change my zero?

Correctly fitted and concentric, no — you still aim through your day scope. A quick-release adapter that returns to the same position each time is what preserves the zero through removal and refitting.

What if my scope's objective is between two adapter sizes?

Size up and use the clamping range, or contact us with the exact measurement and scope model before buying so we can confirm the correct adapter.

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