6 inch Machinist Ruler with 4R Graduations

This 6-inch 4R machinist ruler, crafted by Shinwa in Japan, exemplifies precision and durability. Shinwa, renowned as a leading manufacturer of measuring tools in Japan, sets global standards with their meticulous craftsmanship. Each ruler adheres strictly to Japanese Industrial Standards (JIS B7516 Grade 1), ensuring consistent material quality, hardness, length, thickness, end squareness, finish, flatness, and straightness.

Ideal for a variety of shop measurement and layout tasks, this ruler is compact enough to fit conveniently into pockets or aprons. It features popular 4R markings: 1/8” and 1/16” graduations on one side, and quick-reading 1/32” and 1/64” marks on the reverse. Additionally, one face boasts 1/32” end graduations on both ends, enabling it to function effectively as a mini height gauge for measuring tenon shoulders or setting the height of router bits and table saw blades.

The ruler’s super-fine graduation marks are precision photo-etched and filled with black for enhanced readability. Designed for longevity, these markings resist wear even after years of rigorous use. Constructed from SUS420J2 stainless steel hardened to HRC-40 and coated with a smooth, non-glare chrome finish, the ruler is resistant to scratches and corrosion. This hard chrome coating significantly reduces glare, ensuring clear visibility in bright lighting conditions.

Its edges are meticulously ground straight and smoothed to facilitate effortless scribing with a pencil or marking knife, offering minimal resistance. The ends are ground square to within an impressive 0.001” tolerance. With dimensions of 3/4” in width and 0.032” in thickness, the ruler strikes a balance between rigidity and slight flexibility, accommodating various measurement needs with ease.

For added protection when not in use, each ruler comes with a practical vinyl sleeve. Shinwa’s commitment to quality and precision makes this 6-inch machinist ruler a trusted tool among professionals worldwide, delivering accuracy and durability for demanding workshop environments.

product information: