Bolts screws and studs with specified property classes coarse thread and fine pitch thread.
Metric bolt thread pitch.
The thread pitch is the distance between threads expressed in millimeters measured along the length of the fastener.
For example a thread pitch of 1 5 means that the distance between one thread and the next is 1 5mm.
This bolt is one half inch in diameter has 13 threads per inch and is one inch long.
Sae bolts will not thread perfectly into a metric nut or metric threaded hole.
1 0 pitch distance from thread to thread in millimeters.
Bolt depot common metric thread pitches standard fine super fine jis.
An example of a sae bolt size is 1 2x13x1.
The thread angle is 60 o.
8 nominal diameter in millimeters.
The metric system s pitch is commonly viewed as the reverse of tpi in that it is the distance measured between two adjacent threads.
M metric thread designation.
The rest of the dimensions are tabulated values from the asme standard.
20 length in millimeters see below this example illustrates how a coarse threaded screw may appear.
Metric threads coarse thread pitches 1 for metric threads pitch is the distance between threads.
The thread depth is 0 614 x pitch.
Thread pitch is the number of threads per inch.
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.
Maximum rounded form minor diameter d 3max d 2max 0 5h 2r min 1 cos 60deg arccos 1 t d2 4r min.
M12 x 25 12 mm diameter coarse thread is assumed 1 75 mm 25 mm long.
Thread pitch metric fasteners are specified with a thread pitch instead of a thread count.
Functional diameter is a measure of the ability to assemble the thread.
Bellow are iso din accepted thread pitch charts for commonly found metric fasteners.
American or sae bolt sizes are expressed as diameter x thread pitch x length.
As i explained at the top of the page metric bolt sizes are stated as diameter x distance between threads x length.
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.
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.
