Metric Bolt Thread Pitch

Maximum rounded form minor diameter d 3max d 2max 0 5h 2r min 1 cos 60deg arccos 1 t d2 4r min.

Metric bolt thread pitch.

Metric threads coarse thread pitches 1 for metric threads pitch is the distance between threads. Functional diameter is a measure of the ability to assemble the thread. 8 nominal diameter in millimeters. The thread pitch is the distance between threads expressed in millimeters measured along the length of the fastener.

The smallest or largest pitch diameter that fits onto a screw or into a nut including all of the form deviations such as lead thread angle taper and roundness. M metric thread designation. An example of a sae bolt size is 1 2x13x1. The rest of the dimensions are tabulated values from the asme standard.

The thread angle is 60 o. Ultimate tensile and proof loads for metric bolts according iso 898 1 mechanical properties of fasteners made of carbon steel and alloy steel part 1. Sae bolts will not thread perfectly into a metric nut or metric threaded hole. Here is lightning bolt s metric bolt thread pitch chart.

1 0 pitch distance from thread to thread in millimeters. As i explained at the top of the page metric bolt sizes are stated as diameter x distance between threads x length. For example a thread pitch of 1 5 means that the distance between one thread and the next is 1 5mm. Thread pitch is the number of threads per inch.

This bolt is one half inch in diameter has 13 threads per inch and is one inch long. 20 length in millimeters see below this example illustrates how a coarse threaded screw may appear. Metric thread pitch table metric pitch table metric diameter pitch mm coarse standard fine standard 3mm 0 50 0 35 4mm 0 70 0 50 5mm 0 80 0 50 6mm 1 00 0 75 8mm 1 25 1 00 10mm 1 50 1 25 12mm 1 75 1 25 14mm 2 00 1 50 16mm 2 00 1 50 18mm 2 50 1 50 20mm 2 50 1 50 22mm 2 50 1 50 24mm 3 00 2 00 27mm 3 00 2 00 30mm 3 50 2 00 33mm 3 50 2 00 36mm 4 00 3. Bolts screws and studs with specified property classes coarse thread and fine pitch thread.

The metric system s pitch is commonly viewed as the reverse of tpi in that it is the distance measured between two adjacent threads. The thread depth is 0 614 x pitch. In the imperial inch system threads are commonly referred to by measuring an inch and counting how many threads are inside that measurement. Here r min is minimum root radius t d2 is pitch diameter tolerance and h is height of sharp v thread.

Bellow are iso din accepted thread pitch charts for commonly found metric fasteners. Thread pitch metric fasteners are specified with a thread pitch instead of a thread count.