Metric Bolt Thread Pitch

Here is lightning bolt s metric bolt thread pitch chart.

Metric bolt thread pitch.

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. 1 0 pitch distance from thread to thread in millimeters. Maximum rounded form minor diameter d 3max d 2max 0 5h 2r min 1 cos 60deg arccos 1 t d2 4r min. For example a thread pitch of 1 5 means that the distance between one thread and the next is 1 5mm.

The thread pitch is the distance between threads expressed in millimeters measured along the length of the fastener. The thread depth is 0 614 x pitch. The thread angle is 60 o. Sae bolts will not thread perfectly into a metric nut or metric threaded hole.

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. In the imperial inch system threads are commonly referred to by measuring an inch and counting how many threads are inside that measurement. Thread pitch is the number of threads per inch. Functional diameter is a measure of the ability to assemble the thread.

American or sae bolt sizes are expressed as diameter x thread pitch x length. Here r min is minimum root radius t d2 is pitch diameter tolerance and h is height of sharp v thread. M12 x 25 12 mm diameter coarse thread is assumed 1 75 mm 25 mm long. Metric threads coarse thread pitches 1 for metric threads pitch is the distance between threads.

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. M metric thread designation. Bellow are iso din accepted thread pitch charts for commonly found metric fasteners. The rest of the dimensions are tabulated values from the asme standard.

Bolt depot common metric thread pitches standard fine super fine jis. The metric system s pitch is commonly viewed as the reverse of tpi in that it is the distance measured between two adjacent threads. Bolts screws and studs with specified property classes coarse thread and fine pitch thread. 8 nominal diameter in millimeters.

Thread pitch metric fasteners are specified with a thread pitch instead of a thread count. An example of a sae bolt size is 1 2x13x1.