A Sheet metal screw with a self drilling point. Hex Bolts Bolts with a hexagonal head with threads for use with a nut or tapped hole. Guide to Fastener Size s. Understanding Standard Size Dimensions. The Size Dimension pertains to diameter of screws, bolts, pins and inner diameter of nuts and washers. You may search for your product based on diameter by selecting a measurement on the Size dropdown. Metric External ( Fastener s) Thread and Fastener Size s M20 - M50; ANSI/ ASME EXTERNAL Screw Thread Size Chart. All units are in inches. Unified Screw Threads per. ANSI/ASME B1.1-1989 (R2001), R2001) Nomenclature, are used. Acceptability criteria are described in ANSI/ASME B1.3M-1992 (R2001).

Fastener Size Charts to show fastener dimensions such as hex and heavy hex bolts, hex and heavy hex cap screws, machine screws, socket head cap screws, hex nuts, jam nuts, slotted nuts, acorn nuts, flat washers, split lock washers, fender washers, tooth lock washers, split pins, clevis pins and eye bolts. Use this chart to determine the head size , and therefore the wrench or socket size required, for any hex bolt , heavy hex bolt , lag screw or square bolt you’re using. Bolt Thread Size s. The thread equations given previously for tensile stress area and for minor area were used in constructing the table. The thread size designation for metric thread is given as M [dia] x [pitch]. For example, a thread with a nominal diameter of 6 mm and a pitch of 1 mm is designated as M6 x 1..

The diameter refers to the major diameter, or outside edge, of the threads. If the screw size includes a dash with a number following it, that is the number of threads per inch (tpi). Usually tpi is only shown with machine screws or other fasteners with machine screw threads. So, a 1/4-20 screw has a 1/4 diameter (.250) with 20 threads per inch. These to-scale 'lay-over' chart s let you quickly identify dimensions by simply matching up your fastener with the printout. The printable fastener tools series also includes general chart s and tools for identifying and measuring fasteners, including a ruler and thread gauge.