Pin specifications for standard tenpins are set by the United States Bowling Congress. Pins are 4. 75 inches wide at their widest point and 15 inches (380 mm) tall. They weigh 3 lb, 6 oz, although in 1998 pins weighing 3 lb 10 oz (1. 6 kg) were approved.
Specifications set by the United States Bowling Cogress sitpulate pins should weigh 3lbs. 6oz. However pins weighing 3lbs 6oz. However 3lbs. 10oz. pins were approved in 1998.
The weight of a single pin must be at least 3 pounds, 6 ounces (1. 47 kg) and no more than 3 pounds, 10 ounces (1. 64 kg). The top of the pin shall have a uniform arc with a radius of 1. 273 inches (32. 3 mm), ± 1/32 inch (31. 5 – 33 mm).