Value Collection 637-7535 Tool Steel Parallel Set 18 Pc

Product Description

The VALUE COLLECTION 637-7535 is an 18-piece tool steel parallel set designed for layout work, machine setups, and precision workholding applications. The set consists of 9 matched pairs, each 6 inches long and 1/4 inch thick, with heights ranging from 3/4 inch to 1-3/4 inch in 1/8-inch increments. Ground and hardened to 52-58 RC, these parallels hold a parallelism tolerance of 0.0008 inches and an accuracy of 0.0010 inches. Each bar is stress-relieved against distortion and features holes for easier handling and setup. Machinists, toolmakers, and machine shop technicians use these in milling, grinding, and inspection setups. The set ships in a wooden storage case.

This parallel set is suited for production and toolroom environments where consistent, accurate workpiece elevation is required. Typical applications include supporting workpieces on a milling machine table, aligning parts in a vise for grinding operations, and use as reference standards during inspection and layout. The 1/8-inch height increments across all 9 pairs provide a practical range for common setup requirements. The wooden case keeps pairs organized and protects ground surfaces between uses.

Key Features

• 18 pieces (9 matched pairs), each 6 inches long and 1/4 inch thick
• Height range: 3/4 inch to 1-3/4 inch in 1/8-inch increments
• Parallelism tolerance: 0.0008 inches; accuracy: 0.0010 inches
• Tool steel construction, hardened to 52-58 RC and stress-relieved against distortion
• Holes in each bar for easier handling and fixture setups
• Includes wooden storage case to protect and organize all pairs

Compatibility

Designed as a general-purpose parallel set for use in standard milling vises, surface grinders, and inspection fixtures that accommodate parallels 6 inches in length and 1/4 inch in thickness.

Installation Notes

Parallels are installed by machinists and toolmakers during machine setup — no special tools or trade licensing are required, but proper technique is essential for accurate results. Clean the vise ways and parallel surfaces before use to prevent seating errors caused by chips or debris. Never use parallels as pry bars or striking surfaces, as this can damage the ground faces and compromise accuracy. Inspect ground surfaces periodically for burrs and stone lightly if needed to maintain flatness.