4 inch Super-Lock Precision C.N.C Machine Vise. Features a thrust bearing that increases clamping power by 80%. Jaw height: 1.259". Jaw width: 4". Jaw opening: 4.33". Jaw material: 45# steel Body material: ductile cast iron. Wrench material: ductile iron. Vise Height: 3.385". Workpiece Surface Flatness: 0.02/100mm Can be mounted upright or sideways. Excellent to use when you have multiple vise setups. Can not guarantee the exact location of the Keyway Slot. Need Machining the Keyway if they used in pairs.Internal refine grinding treatment, smooth use. No jamming, rust and corrosion resistance. The surface is quenched, turned, and ground, enabling strong toughness, high tensile strength, and wear resistance. Guide rail surface is a refined ground seamless contact surface. Can be used upright without affecting the accuracy of clamping capacity. For CNC milling machines, drilling machines, and precision parts. Accurately ground flat vise connects precisely with the machine tool, thus reaching an accuracy requirement of 0.0008" (0.02 mm) The Accusize Industrial Tools 4 Inch Super-Lock Precision C.N.C. Machine Vise (FA23-5204) is a foundational tool for CNC machining, providing high-strength clamping capabilities enhanced by an 80% increase in power through its specialized thrust bearing. This vise is an excellent choice for machinists looking to achieve secure and precise workholding in a compact design.Offering flexibility in setup, it can be installed either upright or sideways, making it a versatile addition to any machine shop, especially those with spatial constraints or multiple vise setups. Precision is at the forefront of its design with sides squared to the bottom within a 0.0004'' tolerance and parallelism maintained within 0.0008''. These tight tolerances are crucial for precise machining tasks and maintaining high-quality standards in finished products.This model features a 4" jaw width with an opening of 4.331" and a depth of 1.260", tailored for handling a range of small to medium-sized workpieces. With dimensions of 11.811" in length, 3.976" in width, and 3.386" in height, and weighing 26 lbs, it is both sturdy and manageable.Attention to detail is necessary as the exact location of the Keyway slot is variable; machining may be required for accurate alignment when using multiple vises in conjunction. This vise is a critical asset for professional machinists and fabricators who demand precision and reliability in their CNC operations.