DIN 7981 Self-Tapping Screw with Rounded Head and Blunt End, Form F

The DIN 7981 self-tapping screw with rounded head and blunt end (form F) is designed for driving into a pre-made hole without thread: the thread is formed during installation of the fastener.

The fastener is used for joining sheet materials to frames — metal, plywood, or hardboard sheets. The head is cylindrical, rounded, and fitted with a cross recess for driving.

Features and specifications

The self-tapping screws are made from carbon steel grades, with zinc plating available. Stainless steel A2 and A4 versions are also available — these alloys have increased acid resistance and are not subject to corrosion, ensuring a long service life in aggressive environments.

Characteristics of the rounded-head self-tapping screw:

• Thread diameter options: ST2.2, ST2.9, ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, ST6.3.
• Head height: from 1.8 to 4.5 mm.
• Head diameter: from 4.2 to 12.5 mm.

The self-tapping screws are used for joining sheet materials and fastening them to frames, including thread-forming in soft metals (such as aluminium). They are used in exterior and interior finishing work, construction, industry, various branches of mechanical engineering, as well as for fastening siding and roofing materials.

Ordering from FLOK

FLOK supplies fasteners that meet quality standard requirements. Supply is carried out in wholesale batches of various volumes, with both one-time and ongoing cooperation available.