Crystal Sine Bar for Industrial & Tool Room Use — AA-60101

A sine bar is a precision tool used in engineering and tool rooms to measure angles very accurately or to set up workpieces at a precise angle for machining. It consists of a hardened steel bar with two precision cylinders (rollers) fixed at a known distance.

To measure an angle, the sine bar is placed on a level surface plate. One roller rests on the plate, and the other is elevated by a stack of gauge blocks. The angle is calculated using the sine formula: sin(θ) = height of gauge blocks / center distance between rollers.

Crystal Sine Bars are made from high-quality, hardened, and ground steel. This ensures they are durable, resistant to wear, and maintain their accuracy over a long service life in a workshop environment.

C.D. stands for the Center Distance between the two rollers on the sine bar. This is a critical dimension used in the angle calculation. Our Crystal sine bars are available in 100mm, 200mm, and 300mm center distances.

Yes, all our products come with a standard manufacturer's warranty against manufacturing defects. We provide a GST invoice, and our products are available for pan-India delivery.

Machinists and quality control inspectors working with small, high-precision components should choose the 100mm model. Its compact size is ideal for intricate angle verification and setup where space is limited.

The 200mm sine bar is the most versatile and popular choice, suitable for a wide range of general workshop applications. It offers a great balance between precision and the capacity to handle medium-sized workpieces.

Engineers and technicians working on large-scale industrial machining, fabrication, or inspection should opt for the 300mm model. Its longer center distance provides greater stability and accuracy when measuring or setting angles on large components.

The primary difference is the center distance (C.D.) between the rollers, which dictates the size of the workpiece they can effectively handle and the scale of the measurement. A longer C.D. (300mm) is better for larger parts, while a shorter C.D. (100mm) is suited for smaller, more intricate parts.

The 200mm Crystal AA-60102 model is generally considered the best value for most users due to its versatility for a wide range of tasks. However, the 'best value' depends on your specific application needs—the 100mm is essential for small parts, and the 300mm is necessary for large ones.

A longer center distance can amplify precision over a larger angle, but it also requires more stable and precise gauge block stacks. For a given angle, a longer sine bar requires a taller stack of gauge blocks, which can introduce its own errors if not done carefully. The choice of size should always be matched to the workpiece.