Selecting turnbuckles requires an analysis of product and performance specifications. Basic measurements include diameter, take up, length, and estimated weight. To determine the extended length, turnbuckle suppliers usually add the amount of the take up to the length in the closed position. For turnbuckle eyes,specifications include: outer diameter (ID), inner diameter (ID), total diameter, eye thickness, and maximum load. Turnbuckle hooks carry specifications such as jaw type, throat opening, jawthickness,maximum load, jaw ID, and total diameter. Measurementssuch as hole-center to jaw-end and hole-center to shank are also important considerations. Dimensions for turnbuckles are measured in English units such as inches and fractions of inches (in), or metric units such as millimeters (mm). Both types of turnbuckles can use either left hand threads or right hand threads. For inch- turnbuckles, thread choices include: 10-32, 1/4-20, 1/4-28, 5/16-18，5/16-24,3/8-16, 3/8-24, 1/2 13, and 1/2-20. Metric turnbuckle carry thread designations such as M5 x 0.50, M6 x 1.00, M8 x 1.25, M10 x 1.50, and M12 x 1.75.