ERATAC Clamp Ring with Universal Interface – Clamp Ring with Universal Interface for Optic Accessories
Not every rifle scope sits in a mount with an accessory interface.
The ERATAC Clamp Ring with Universal Interface is an ERATAC clamp ring with a universal interface. It is clamped directly to the appropriate tube or objective diameter of the optic to retrofit accessory interfaces such as levels, SWK (Side-Wind Compensation) or attachments.
This is not a mounting ring that attaches the rifle scope to the weapon. It is an additional clamp ring for accessories. The diameter must exactly match the optic, otherwise the clamping may not fit properly or may unnecessarily stress the optic.
Important note for classification:
Check before purchase: measured outside diameter on the optic, position on the main tube/objective area, clearance to turrets and parallax wheel, required universal interface, screw length and whether accessory weight is appropriate at this point.
Variants: Size: 62mm, 57mm, 56mm, 48mm, 36mm, 34mm, 30mm, 1"/26mm.
What makes this product technically special:
✔ Clamp ring function: creates a universal interface without replacing the main mount.
✔ Diameter variants: 1"/26 mm up to large objective/tube areas – exact measurement is mandatory.
✔ Accessory integration: useful for levels, SWK or small attachments close to the optic.
✔ Retrofit logic: helpful if existing mounts do not have an ERATAC universal interface.
✔ Limit: incorrect diameter or incorrect position can impede operation and stress the optic.
Why this product?
The clamp ring exists for setups where accessories need to be attached to the optic, but the main mount does not offer a suitable interface. This can be useful for long range, mountain hunting or precision setups – but only if the ring fits exactly and does not collide with turrets or operating elements.
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Retrofit accessory interface: without having to change the entire rifle scope mount.
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Freely choose position: within the actual free spaces on the optic.
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For level/SWK: accessories can sit close to the line of sight.
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Variety of variants: allows selection according to the actual optic diameter.
Instructor's tip: Measure outer diameter, don't guess nominal tube diameter
A 30mm main tube does not mean that every part of the rifle scope is 30mm. The objective bell, eyepiece area, and main tube have different diameters.
Measure precisely at the point where the clamp ring is to be positioned. Also check that magnification adjustment, parallax, illumination, or turret caps can still be operated freely afterwards.
Our assessment
The ERATAC clamp ring with universal interface is useful if you want to retrofit accessories to an optic whose mount does not offer an interface. It is less useful if a new main mount with an integrated interface would be cleaner or if there is no free, suitable diameter on the optic.
Useful for:
- Rifle scopes without an ERATAC mounting interface
- Long-range setups with level or SWK
- Mountain hunting and steep shooting angles
- Workbench setups where accessory positions are being tested
Less useful for:
- Optics without a suitable free clamping range
- Very heavy attachments on the clamp ring
- Users who do not precisely measure the outer diameter
- Setups where a mount with an integrated interface is better
Direct Classification:
✔ ERATAC Clamp Ring with Universal Interface: useful if accessories are to be retrofitted to the optic.
✔ ERATAC Mount with Universal Interface: cleaner if you are planning a new rifle scope mount anyway.
The clamp ring is worthwhile if the diameter is correct and the position remains free. If measured incorrectly, it is a classic bad purchase.
Application scenarios
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Long Range: Retrofit level or SWK close to the optic.
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Hunting: Supplement angle/position control without changing the main mount.
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Workbench: Plan accessory positions on existing scopes.
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Precision Rifle: Create an additional interface without re-mounting the optic.
Practical tip: Observe accessory weight and clamping tension
A clamp ring on a rifle scope is not the right place for every heavy accessory. The further out and heavier the component, the more leverage is created.
Tighten screws evenly and with appropriate torque. An accessory clamp ring must not strain the optic.
Features & Construction
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Function: Clamp ring for retrofitting an ERATAC universal interface.
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Diameter: Size: 62mm, 57mm, 56mm, 48mm, 36mm, 34mm, 30mm, 1"/26mm – exact outer diameter on the optic is crucial.
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Mounting position: must be free of turrets, parallax wheel, illumination, and eyepiece/objective movement.
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Practical limit: no substitute for main mounting rings.
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Accessories: for compatible ERATAC universal interface attachments.
Technical Data
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Brand: ERATAC / Recknagel.
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Product Type: Clamp ring with universal interface.
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Variants: Size: 62mm, 57mm, 56mm, 48mm, 36mm, 34mm, 30mm, 1"/26mm.
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Size: 62mm, 57mm, 56mm, 48mm, 36mm, 34mm, 30mm, 1"/26mm – determines the suitable version, not just the optic.
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Manufacturer/Item Numbers: 62mm: 03680-5762; 57mm: 03680-5757; 56mm: 03680-5756; 48mm: 03680-5748; 36mm: 03680-5736; 34mm: 03680-5734; 30mm: 03680-5730; 1"/26mm: 03680-5726.
Scope of Delivery
- 1x ERATAC Clamp Ring with Universal Interface in selected variant
Not included:
No rifle scope mount, no rifle scope, no level, no SWK and no mounting plate. Accessories must be selected separately to match the universal interface.
FAQ
Is this a mounting ring for the rifle scope?
No. The clamp ring does not support the main optic on the weapon. It serves to retrofit an accessory interface to the optic.
Which diameter should I choose?
The actually measured outer diameter at the point where the clamp ring is to be placed – not generally the main tube diameter.
Can I mount heavy devices on it?
Only very carefully. The clamp ring is primarily intended for accessories such as levels or SWKs. Heavy devices can increase leverage and stress.
Does the clamp ring interfere with the operation of the optic?
That depends on the position and the scope. Turrets, parallax wheel, illumination, and magnification ring must remain free.
When is the clamp ring not useful?
If there is no suitable free clamping point or if a new mount with an integrated interface would be a cleaner solution.
Conclusion: The ERATAC clamp ring with universal interface is a useful retrofit part for precisely configured optical systems. Exact measurement, free operation, and reasonable accessory weight are crucial.
