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METRIC THREAD

Metric thread charts provide essential data for selecting, machining, and assembling threaded fasteners in pumps, valves, and process equipment. This table lists standard thread sizes, pitches, depths, and recommended drill diameters for tapping and clearance holes, helping engineers achieve accurate and consistent fits in fluid handling applications.

METRIC THREAD CHART mm

Nominal
M
Pitch Depth Tap
Drill
Clearance
Drill
1.60.350.2151.251.65
20.40.2451.62.05
2.20.450.2761.752.25
2.50.450.2762.052.6
30.50.3072.53.1
3.50.60.3682.93.6
40.70.4293.34.1
4.50.750.463.84.6
50.80.4914.25.1
610.61356.1
81.250.7676.88.2
101.50.928.510.2
121.751.07410.212.2
1421.2271214.25
1621.2271416.25
182.51.53415.518.25
202.51.53417.520.25
2431.842124.25
303.52.14726.530.5
3642.4543236.5
424.52.7637.542.5
454.52.7640.545.5
4853.0674348.75
5253.0674752.75
565.53.37450.556.75
605.53.37454.560.75
6463.6815864.75
6863.6816268.75

Values shown are nominal. Units in millimetres (mm).

Using the correct thread dimensions ensures secure and leak-free connections in mechanical joints. Precision in pitch and depth prevents stripping, galling, or loosening under vibration or pressure. By following metric standards, designers and technicians can maintain compatibility between components sourced from different suppliers.

In food and industrial environments, proper thread sizing also contributes to hygienic and serviceable equipment design. Threads that are too tight can trap residues, while oversized clearances may compromise sealing or structural strength. Using accurate drill and tap data ensures optimal assembly and long-term reliability.

Metric threads follow standardized profiles under ISO norms, allowing universal interchangeability. Engineers use these values during fabrication, maintenance, and retrofitting to ensure mechanical integrity. For critical joints, always verify tolerances and material compatibility to meet operational and safety requirements.

This reference simplifies the process of selecting and machining threads for use in pumps, fittings, and structural assemblies. Adhering to metric thread standards enhances precision, durability, and maintainability across all types of fluid handling and process systems.

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DISCLAIMER: The information provided by AxFlow Holding AB ('we', 'us', or 'our') on https://www.axflow.com (site 'Site') is for general information purposes only.
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