Metric Machine Screws Dimensions

Size nominal thread diameter.

Metric machine screws dimensions. Nominal screw length tolerance on length mm. The designation of a screw thread gives the thread symbol the nominal size the pitch and the thread tolerance class ex. Citation needed the m designation for metric screws indicates the nominal outer diameter of the screw thread in millimetres e g an m6 screw has a. Size limits for standard external thread tolerance classes 6g and 4g6g apply prior to coating.

Decimal nearest fractional 0. Over 3 to 10 mm 3. Screws pre assembled with a permanently attached free spinning washer for convenient installation. Size of screws and metric to imperial screw conversion chart and how to identify the diameter and length of imperial and metric screws.

M6 x 1 4g6g. Make sure that you get the right sized screw. In stock and ready to ship. Most screws in the metric system have 1 pitch that corresponds to each diameter.

Over 10 to 16 mm 4. The external thread allowance may thus be used to accommodate the coating thickness on coated parts. For instance 2 mm screws have a pitch of 0 4 mm. Metric screw thread chart metric tap size tap drill inches clearance drill inches m1 6 x 0 35 55 0 052 50 0 070 m1 8 x 0 35 53 0 057 48 0 0 76 m2 x 0 4 52 0 063 45 0 082 m3 x 0 5 39 0 0995 1 8 0 125 m3 5 x 0 6 32 0 116 28 0 140 m4 x 0 7 29 0 136 19 0 166.

The iso metric screw threads are the most commonly used type of general purpose screw thread worldwide. Sizing the right screw can be complicated unless you are familiar with the various screw sizings that are quoted on the packaging often both in imperial and metric. The threads of an m14 2 0 screw which is coarse are spaced 0 079 inches 2 0 mm. The pitch of a screw is typically less than 1 mm you would measure it as a decimal point of a mm.

To 3 mm incl 2. They were one of the first international standards agreed when the international organization for standardization iso was set up in 1947. Machine screws have machine threads for use with a nut or in a tapped hole.