DIN 7504 Self-Tapping Screw with Countersunk Head and Drill Point, Form O

Self-tapping screws with countersunk head and drill (drill point) are manufactured to DIN 7504 — this tip allows drilling holes in the material while screwing in.

Form O features a round head: it is not recessed into the material and sits above the surface. The head has a cross recess for ease of driving. The fastener is used for attaching sheet metal to various frames and is widely used in construction. The special thread eliminates the need to pre-drill a hole in the material.

Materials and specifications

The base material is carbon steel St, protected from corrosion with a zinc or nickel coating. Screws of this type are also made from austenitic stainless steel A2 and A4: it is not subject to corrosion and can be used in chemically aggressive environments. The screws self-tap a metric thread, which ensures quick installation.

Technical characteristics:

• Standard length of the metal shank is from 9.5 to 50 mm.
• Drill diameter is from 2.3 to 5.8 mm.
• Thread variants: ST2.9, ST3.5, (ST3.9), ST4.2, ST4.8, ST5.5, ST6.3.
• The closest analogues are manufactured to the international standards ISO 7049 – ISO 7051.

Fasteners of this type are used in construction and finishing of buildings: for installing siding and cladding façades, for fastening profiled sheet, metal roof tiles and other materials. They ensure secure fixation with minimal hole size.

Supply

FLOK supplies fasteners in a wide range of sizes, in wholesale quantities of any volume.