![]() ![]() The thread profile is based on a parameter H, the height of the fundamental triangle. ![]() You’ll notice that many vintage watches are relatively modest in size by modern standards. Use Crown & Calibers watch sizing tool here to ensure your watch fits correctly. The following equations can be used to calculate dimensions for ISO metric threads. A watch size chart can help you find the best fit for your next watch. For example, a thread with a nominal diameter of 6 mm and a pitch of 1 mm is designated as "M6 x 1." The thread size designation for metric thread is given as "M x ". The thread equations given previously for tensile stress area and for minor area were used in constructing the table. Coarse pitch threads are preferred and should be used whenever possible, as stated in ASME B1.13M. The following table of thread sizes for coarse and fine pitch thread was created using the standard sizes from ASME B1.13M. This section contains tables of sizes for metric thread hardware. Type A washers come in 2 series: Narrow and Wide. The following table of flat washer dimensions was adapted from ASME B18.21.1, Table 11 for Type A Plain Washers. The following equations can be used to calculate internal thread dimensions for Unified Inch threads: The following table of hex nut dimensions was adapted from ASME B18.2.2, Table 4, "Dimensions of Hex Nuts and Hex Jam Nuts." The following table of hex nut dimensions was adapted from ASME B18.2.2, Table 1-1, "Dimensions of Square and Hex Machine Screw Nuts." This table is used for smaller size hardware. The following table of hex bolt head dimensions was adapted from ASME B18.2.1, Table 2, "Dimensions of Hex Bolts." The following table of hex bolt head dimensions was adapted from ASME B18.6.3, Table 29, "Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws." This table is used for smaller size hardware. Where L is the total bolt length and d nom is the nominal bolt diameter. Per ASME B18.2.1, the nominal thread length of inch-series bolts can be found by: The following table of clearance holes was adapted from ASME B18.2.8. In the table above, d nom is nominal diameter in inches and TPI is threads per inch. The following equations can be used to calculate dimensions for Unified Inch threads: The following table of thread sizes for coarse and fine thread was adapted from ASME B1.1: Size This section contains tables of sizes for inch thread hardware. ![]() Bolted Joint Calculator Hardware Sizes: Unified Inch Screw Thread. ![]()
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