Accurate measurements are essential for mechanical, industrial, automotive, home, and sports projects. Our Size Charts category provides clear, high-quality reference guides for bolts, screws, threads, wires, pipes, bearings, automotive components, home appliances, sports equipment, hardware tools, and more. Developed by experienced engineers with over 10 years in measurement systems and dimensional analysis, these charts ensure precision, efficiency, and confidence in every task. Whether you are working on CNC machining, fabrication, repairs, or DIY projects, our size charts are a trusted resource—helping readers select the right components, compare metric and imperial units, avoid errors, and save valuable time.
Choosing the correct screw length is just as important as selecting the right diameter, thread, and head style. A screw that is too short may not provide enough thread engagement, while one that is too long can protrude through the material, interfere with components, or create an installation problem. A screw length chart makes it … Read more
Choosing the correct screw becomes much easier when you understand metric screw sizing. A designation such as M6 × 30 mm tells you important information about the fastener: the nominal thread diameter is 6 mm and the screw length is 30 mm. However, diameter and length are only part of the specification. Thread pitch, head … Read more
Washers look simple, but choosing the correct size involves more than matching the outside diameter. The washer inner diameter (ID) determines whether the washer will fit over the bolt, screw, stud, or other fastener without binding or leaving excessive clearance. This washer inner diameter chart provides a practical reference for common metric and SAE/US flat … Read more
A metric washer size chart makes it easier to identify the correct washer for a metric bolt, screw, or threaded fastener. The washer must have a suitable inside diameter for the fastener while providing enough outside diameter and bearing area for the application. Metric washers are commonly identified by nominal fastener size, such as M3, … Read more
Washers are simple components, but choosing the correct one requires more than matching the bolt diameter. The washer dimensions—including inside diameter (ID), outside diameter (OD), and thickness—determine how well a washer fits and distributes load. This complete washer dimensions chart covers common metric flat washers, standard inch washer sizes, key measurements, washer types, and practical … Read more
An M8 bolt size chart makes it easier to identify the correct diameter, length, thread pitch, and head dimensions for a fastening job. Although “M8” tells you the bolt has an approximately 8 mm nominal thread diameter, it does not describe the bolt’s length, head style, thread pitch, or strength class. This guide covers the … Read more
Choosing the correct fastener becomes much easier when you understand what M5 actually means and how its diameter, thread pitch, length, and head dimensions relate to one another. An M5 bolt has a nominal metric thread diameter of 5 mm, but its overall dimensions depend on the bolt type and applicable standard. This M5 bolt … Read more
An M4 bolt is a metric fastener with a nominal thread diameter of 4 mm. It is widely used in machinery, electronics, automotive components, furniture, brackets, enclosures, appliances, and general mechanical assemblies. However, knowing that a fastener is “M4” is only the starting point. The correct bolt length, thread pitch, head size, drive type, and … Read more
Choosing the correct spring pin starts with understanding its nominal diameter, length, pin type, and mating hole. Unlike a solid dowel pin, a spring pin is designed to flex or compress when installed, allowing it to maintain pressure against the sides of the hole. This spring pin size chart covers common metric and inch sizes, … Read more
A dowel pin is a precision cylindrical pin used primarily to locate, align, and accurately position two or more machine components. Choosing the correct diameter, length, tolerance, and hole fit is important because a dowel that is too loose may allow movement, while one that is too large can damage the mating hole during installation. … Read more
