• Screw Thread Pitch

    Posted August 22, 2019 - Updated Dec 3, 2019

    Identifying Thread Pitch The thread pitch can be measured with a steel rule, as illustrated in Figure 44, or a caliper or comparator can be used. The thread pitch is the axial distance from one thread groove to the next. By laying a steel rule down the axis of a screw and counting the number […]

  • Hand of the Thread

    Posted August 22, 2019 - Updated Dec 3, 2019

    Identifying Hand of the Thread The hand of the thread can be easily determined by visual inspection. Simply compare your screw threads with the right hand and left-hand threads illustrated in Figure 48. Most threads are right hand and right hand is assumed if no left-hand designation is specified. Left-hand threads are common on manual […]

  • Pitch Diameter

    Posted August 22, 2019 - Updated Dec 3, 2019

    Identifying Pitch Diameter The pitch diameter is the diameter at which the thread tooth and the thread space are equal. To accurately measure the pitch diameter requires an optical comparator or thread wires. The optical comparator is the easiest to use as the measurement can be directly made and no mathematics is necessary. The disadvantage […]

  • Major & Minor Diameter

    Posted August 22, 2019 - Updated Dec 3, 2019

    Identifying Major Diameter The major diameter can be measured with a micrometer, caliper or steel rule. Major diameters are generally the first numbers found in thread designations. A 1/2-10 Acme thread, for example, has a major diameter of .500 in. Care must be taken to measure the major diameter on a section of the screw […]

  • Screw University

    Posted May 31, 2016 - Updated Dec 4, 2019

    Screw University Screw University is your go-to source for education around Roton’s complete line of power transmission screws and nuts. Each category on the left covers a range of topics to build your expertise in the design and application of our screw systems. We start with the basics, covering thread standards and motions, then introduce […]