M1.4 Nut Dimensions: Thread & Diameter

M1.4 nut dimensions or sizes are critical for high-precision robotics, miniature circuit board assemblies, and optical instrument manufacturing. This size is specifically engineered to mate with fasteners having a 1.40 mm nominal diameter and is available in M1.4 x 0.3 for the coarse series and M1.4 x 0.2 for the fine series where 0.3 and 0.2 represents the thread pitch in millimeters.

This charts is based on (DIN 934 / ISO 4032) standard for a regular series hex nut. The thread dimensions comply with DIN 13-1 (coarse series), DIN 13-21 (fine series) and ISO 68-1 standards to ensure a precise fit and reliable engagement across ultra-fine metric fastening systems.

Disclaimer: Actual dimensions, including the width across flats (spanner or wrench size), nut height, and thread tolerance may vary depending on the specific manufacturing class and material — always verify with the official product datasheet before use or buying.

Nut internal thread diagram depicting major diameter, minor diameter, and pitch diameter
Nut body diagram depicting width across flats, width across corners, diameter, and thickness or height
M1.4 x 0.3 Hex Nut – DIN 13-1/ISO 68-1
DimensionSize (mm)
MinMax
Major Diameter 1.4 1.509
Pitch Diameter 1.27 1.35
Minor Diameter 1.183 1.258
Thread Pitch 0.3
M1.4 x 0.2 Hex Nut – DIN 13-21/ISO 68-1
DimensionSize (mm)
MinMax
Major Diameter 1.4 1.492
Pitch Diameter 1.27 1.333
Minor Diameter 1.183 1.258
Thread Pitch 0.2
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Frequently Asked Questions

What size wrench or spanner do I need for an M1.4 nut?

An M1.4 hex nut typically requires a 3 mm wrench or socket. The standard width across flats (s) for an M1.4 nut is 3.00 mm. Due to the delicate nature of these fasteners, specialized micro-tools are required to avoid rounding the hex corners.

When is the M1.4 nut typically preferred over M1.2 or M1.6?

The M1.4 size is a standard choice in eyeglass repair and small electronics where M1.6 is slightly too bulky, but the load requirements require slightly more thread surface area than an M1.2 fastener can provide.