A gunmsith or machinist should be able to help.
what does a standard thread gauge measure
To read thread size accurately, use a thread pitch gauge to measure the distance between threads. Match the gauge to the threads on the fastener to determine the size. Additionally, use a thread pitch chart to cross-reference the measurements for accuracy.
A thread gauge is a tool used for identifying the particular thread on a bolt or screw. The gauge will have several blades with saw like teeth of different sizes. You match a particular gauge to the thread which will then tell you what size thread it is. gauges come in various pitches to match different screw threads. UNF, UNC, Whitworth, Metric etc. Each has a different pitch angle and thread per inch or millimetre.An image of a thread gauge can be seen HERE
To determine the size of a thread, you can use a thread gauge tool or a caliper to measure the diameter of the thread. The size is typically expressed in terms of the thread's pitch and diameter, which can help you identify the thread size.
A "screw pitch gauge" is used to measure screw pitch. Typically, the gauge has a number of indented templates for each standard pitch. Matching a particular template to the screw or nut gives the pitch. You can also use a measuring device (ruler, micrometer, etc.) to measure a group of threads and then "do the math" to estimate pitch. Accuracy depends on your ability to accurately measure length and count threads.
Pitch is the distance from the crest of one thread to the next. the displacement of the circular scale due to a complete rotation of the screw, along the main scale is called screw pitch..
Some limitations of screw pitch gauges include the potential for human error in accurate measurement due to variation in pitch angle, difficulty in measuring worn or damaged threads, and limits in the range of thread sizes that can be accurately measured by a single gauge.
pitch = 1/Threads per Inch So for a 1/2 - 20 thread the pitch is .1
A pitch of three means three threads per inch so, one thread every .333 inches.
Our laboratory screw gauge has a pitch of 1 millimeter.
A thread guide is a tool to measure the number and pitch of threads on a bolt
The only cars that I am positive have 1.25 thread pitch is the following; 350z, 370z, G35, G37, and sti's.