ISO 4014

Covers — dimensions of metric hexagon head bolts with a partially threaded shank, product grades A and B, including head size, shank/thread lengths, and tolerances.

Does NOT cover (exclusions) — the following are governed elsewhere:

• Fully threaded hex screws → ISO 4017.
• Bolt mechanical properties → ISO 898-1.
• Nut dimensions → ISO 4032; inch-series bolts → ASME B18.2.1.

ISO 4014 = partially threaded metric hex bolt; ISO 4017 = fully threaded equivalent.

ISO 4014 sets minimum requirements for metric hex bolts:

• Dimensions — head width across flats, head height, shank length, and thread length by size.
• Product Grades — A and B tolerance classes.
• Thread — metric coarse (and fine, where specified) with a plain shank under the head.

ISO 4014 is the dimensional standard for partially threaded metric hexagon head bolts — the ISO counterpart of ASME B18.2.1. It defines head size, shank and thread lengths, and tolerances, with a plain shank under the head that distinguishes it from the fully threaded ISO 4017 screw.

Geometry only: the bolt's strength is set by its ISO 898-1 property class, and nuts come from ISO 4032. Partially threaded bolts are chosen where the unthreaded shank should bear shear load across a joint.

Engineering Note: Use ISO 4014 (partially threaded) where the shank must take shear in the joint, and ISO 4017 (fully threaded) where thread engagement to the head is needed — the two are not always interchangeable.