Shinwa 6" Rigid Machinist Ruler 4R Graduations with End Grads

One way to up your woodworking game is to upgrade to professional-grade machinist measuring tools. An excellent place to start is to begin using Shinwa precision rulers for measurement and layout tasks. Shinwa is the leading manufacturer of measuring tools in Japan and is quickly becoming the benchmark worldwide. All their rulers are made to strict Japanese Industrial Standards (JIS B7516 Grade 1) for material consistency, hardness, length, thickness, end squareness, finish, flatness and straightness. Shinwa makes a wide range of rulers for machinists, architects, artists, draftsman, engineers, woodworkers and more with various graduations and in numerous lengths. The most common graduation marks used by woodworkers are 4R, which are 1/8”, 1/16”, 1/32” and 1/64” markings.

This 6” 4R machinist ruler is the perfect size for most shop measurement and layout tasks. It slips nicely in the pocket or apron. It has the popular 4R markings with 1/8” and 1/16” graduations on one side and quick-reading 1/32” and 1/64” marks on the reverse. This rule also has very handy 1/32” end graduations on both ends of one face, so when placed on its side it can be as a mini height gauge to measure the height of tenon shoulders or set the height of router bits or table saw blades. The super-fine graduation marks have been precision photo-etched and then black-filled for easy readability. These markings will not wear off even after years of abuse. The rule is made from SUS420J2 stainless steel hardened to HRC-40 and then coated with a smooth, hard, non-glare chrome. This hard chrome makes the rule resistant to scratches and corrosion, but also eliminates glare greatly enhancing readability in bright-light conditions. The edges are ground straight and then smoothed so when scribing along the edge with a pencil or marking knife not even the slightest resistance is encountered. The ends are ground square to within 0.001”. The rule is 3/4” wide and 0.032” thick giving the rule rigidity with just a slight amount of flex. Rule comes with a vinyl sleeve for protection when not in use. You will not find a better or more useful rule for the price anywhere.