Sizing & Charts

Bolt Size Chart (SAE & Metric) – Complete Guide

Bolt Size Guide: SAE & Metric Explained Locating the perfect bolt size doesn't need to be challenging. Whether you're choosing between metric or SAE fasteners, a robust bolt size guide can be a game-changer. Here, you will find detailed bolt size charts, conversion methods, and practical advice to ensure you select the right fastener for your specific needs. The Importance of Bolt Size Selecting an incorrect bolt size can lead to unsatisfactory connections, damaged threads, potential structural failure, and unnecessary expenditure of resources. Opting for the correct size guarantees a secure attachment and optimizes longevity in your projects. SAE Bolt Size Overview The chart below lists prevalent SAE bolt sizes commonly utilized in both industrial and general tasks: Diameter (Inch) Coarse Threads Per Inch Fine Threads Per Inch 1/4" 20 28 5/16" 18 24 3/8" 16 24 7/16" 14 20 1/2" 13 20 5/8" 11 18 3/4" 10 16 Understanding Metric Bolt Sizes Metric bolts adhere to a standardized measurement system using millimeters. Below are popular metric sizes readily available: Diameter (mm) Thread Pitch (mm) M6 1.0 M8 1.25 M10 1.5 M12 1.75 M16 2.0 M20 2.5 Conversion from SAE to Metric Utilize this conversion reference to align different systems for approximate equivalents: SAE (Inch) Metric (Approx.) 1/4" M6 5/16" M8 3/8" M10 1/2" M12 5/8" M16 3/4" M20 Note: These are close approximations rather than exact matches. Ensure compatibility for crucial applications. Deciphering Bolt Notations Bolt specifications are neatly presented in a standard format: SAE Example: 1/4"-20 x 2"Metric Example: M8-1.25 x 50mm Explanation: The initial figure denotes diameter, the second figure indicates thread pitch (threads per inch for SAE or millimeters for metric), while the last figure specifies length. Mastering this notation facilitates easy selection of the required bolt. Choosing the Appropriate Bolt The bolt size you need is influenced by several factors: material thickness, load requirements, thread type, and operational environment. If uncertain, always measure against a size chart or consult with a fastener expert from Fastener Fix. Avoiding Common Sizing Errors Ensure not to mix metric and SAE bolts, assume similar sizes are interchangeable, overlook thread pitch variations, or choose incorrect bolt lengths. Such missteps could endanger structural integrity and necessitate expensive corrections. Locating Your Ideal Fastener With a strong understanding of bolt specifications, efficiently find the exact fastener needed for your task. Filter by diameter, length, thread type, and material to identify what perfectly suits your requirements. Refer back to this guide whenever you need quick bolt size verification. Possessing precise sizing data guarantees solid connections and unwavering reliability.