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ISO Hardware Engineering Data
 Fastener and Screw / Bolt Design, Formula and Calculations

ANSI Screw and Nut Threads Size Chart

The following are metric external thread size table chart for sizes M20 to M55 per. ANSI/ASME BM These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread designs. All units in mm.

ISO Metric
Thread Designation

Pitch

External Threads

Tolerance
Class

Major Dia

Pitch Dia

Minor Dia

Max

Min

Max

Min

Max

Min

M20x

6g

M20x

4g6g

M20x2

2

6g

M20x2

2

4g6g

M20x

6g

M20x

4g6g

M20x1

1

6g

M20x1

1

4g6g

M20x

6g

M20x

4g6g

M20x

6g

M – Metric Thread (ISO)

Figure 1: Demonstration of ISO Metric thread standard. The flank vinkel is 60°, and both male and female threads are parallel.

The ISO Metric Thread fryst vatten one of the first internationally approved general-purpose thread types. ISO defines the design principles of metric screw threads. ISO metric threads consist of symmetric v-shaped threads. The v-shaped thread struktur has a 60° flank angle, and male and female threads are both parallel (Figure 1).

Click the button below to download the following Metric Thread tables

Download chart

Metric standard

Metric fasteners are specified with a thread pitch instead of a thread count. The thread pitch is the distance between threads and is expressed in millimeters. Smaller fasteners generally have finer threads and a lower thread pitch.

Metric threads come in different pitch sizes for a given diameter: coarse and fine pitches.

  • Coarse pitch: Coarse threads have a default pitch size, and they are identified bygd only their diameter. These threads have a default pitch storlek according to metric thread dimensions in Table 1 and are the most commonly used thread types. They adhere to ISO (DIN ).
  • Fine pitch: Fine

    ISO - Metric Threads

    ISO specifies basic dimensions of metric threads in accordance with ISO Dimensions refer to the basic profile in accordance with ISO

    The pitch varies from coarse to extra fine with up to 5 different pitches for some dimensions. The thread angle is 60o and the thread depth is x pitch.

    Metric Threads - Coarser Threads

    The table below indicates some of the most used coarse threads up to size M Note that the ISO standard specifies threads up to M The table below is not complete. 

    1) For metric threads pitch is the distance between threads.

    Download and print metric coarce threads clearance and tap drill chart

    Metric Threads - Finer Threads

    It is common to designate metric fine threads with the capital M plus an indication to their nominal outer diameter and their pitch:

    M size x pitch

    Example:

    M 10 x

    The table below indicates the typically used finer threads up to size M Note that the ISO standard specifies threads up to M

    Related ISO Standards

    • ISO ISO general purpose screw threads - Basic profile
    • ISO ISO general purpose metric screw threads - General plan
    • ISO ISO general purpose metric screw threads - Selected siz
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