Arca Swiss Compatible Screw-On Index Stop Bar for M2 Series Rails

The Hejnar Photo M2 Series Index Stop Bar is a specialized precision accessory engineered exclusively for our updated M2 rail architecture. This screw-on type alignment block allows photographers to mechanically register their equipment positions, making it effortless to recreate exact setups for macro stacking or panoramic workflows. Beyond its role as a rail stop, it is designed for compatibility with M2 series camera plates to serve as a high-security anti-twist ridge. Proudly CNC-machined in the USA, this component replaces the older M1 series hardware for users transitioning to the M2 standard.

SAE Technical Specifications

• Compatibility: M2 Series Rails and M2 Series Camera Plates Only.
• Mounting Style: Screw-on type for dedicated M2 tapped holes.
• Material: CNC-machined solid 6061-T6 Aluminum.
• Finish: Black hard-coat anodized surface for professional durability.
• Hardware: Stainless steel mounting screw included.
• Origin: Precision manufactured in the USA.

Quick Overview & Key Features

• M2-Exclusive Fit: Specifically designed to match the geometry and hole patterns of the M2 series, ensuring a flush and secure fit.
• Repeatable Accuracy: Serves as a physical boundary on M2 rails, allowing you to slide Arca Swiss type clamps to the exact same position for every shoot.
• Anti-Twist Ridge Functionality: When used with M2 series camera plates, it provides a mechanical lip that prevents lens foot rotation—critical for single-hole lens feet.
• Modular Stability: Facilitates the conversion of M2 rails into bidirectional systems when used in combination with specialized M2 dovetail plates.
• Professional Finish: The black anodized coating provides high wear resistance and matches the aesthetic of high-end camera rigs.

Detailed Product Description

The Hejnar Photo M2 Series Rail Index Stop Bar is an essential modular component for the modern Arca Swiss based ecosystem. As part of our commitment to precision, the M2 series offers refined tolerances and improved accessory integration. This stop bar allows technical photographers to create a physical "memory" on their rail, significantly reducing setup time for field macro work or multi-row panoramic stitching.

When mounted to an M2 series camera plate, this hardware acts as a robust anti-twist barrier. Single-screw lens feet are prone to shifting under the weight of professional telephoto lenses; this bar provides the unyielding physical contact necessary to lock your gear into place. By distributing rotational torque across the entire aluminum plate, it ensures your focal plane remains perfectly aligned throughout the shoot.

Machined from aircraft-grade aluminum and finished with a durable hard-coat anodize, this M2-specific accessory is built to meet the rigorous demands of professional use. It provides the same high-level stability and accuracy that competitive brands like Really Right Stuff offer, while maintaining the specialized modularity unique to Hejnar Photo hardware.