125 mm PLUS support rings (PrimaLuceLab, SKU: PLLANSU125P ) are a pair of lightweight, durable clamps designed for OTAs with a diameter of about 125 mm – typically for 4.5–5″ refractors and 5″ Maksutov catadioptrics. The set uses the PLUS mounting standard, allowing simultaneous screwing of Vixen / Losmandy rails under the telescope and guides or other accessories above the OTA while maintaining perfect alignment.

Key Features of the 125mm PLUS Rings

• Inner diameter 125 mm – fits tubes 124 – 126 mm
• M6 threads in the PLUS system grid: 55 mm (Losmandy) and 20 mm (Vixen)
• hinge and knurled pressure screw – quick opening, secure closing
• CNC machined from 6061-T6 aluminum, hard anodized - high stiffness and corrosion resistance
• possibility of mounting rails or guides under and above the tube – simple expansion of the configuration

Set components

• two 125 mm PLUS support rings

Technical parameters

• Inner diameter: 125 mm
• mounting threads: 6 × M6 (PLUS standard)
• hole spacing: 55 mm (Losmandy) / 20 mm (Vixen)
• material: aluminum 6061-T6, anodized
• compatible tubes: Ø 124 – 126 mm
• manufacturer: PrimaLuceLab – Italy

The 125mm PLUS rings provide stable mounting for small telescopes and full integration with the modular PrimaLuceLab PLUS accessory ecosystem.