VDF – Double thread screw for corrugated roofs – curved tiles – corrugated metal roofing – wooden beams

VDF – Double thread screw for corrugated roofs – curved tiles – corrugated metal roofing – wooden beams

The GAMMA double thread screw allows quick and safe installation on all types of pitched roofs covered with corrugated systems, corrugated metal roofing, various types of curved tiles, timber beams, etc. The generous adjustment allows efficient levelling of uneven roofs. The screw is supplied complete with 3 flange nuts with knurled under-head screw lock in Stainless Steel 304 and a high-density EPDM gasket.
The screw is combined with the GAMMA PST-10/12 plate.

TECHNICAL DETAILS

PROPERTIES OF GAMMA ALUMINIUM PROFILE MATERIALS

Material type EN AW 6060
Tensile strength Rm (Mpa) 190
Elastic limit Rp 0.2 (Mpa) 150
Elongation at 50 mm (%) 10
HB hardness 70
Coefficient of linear thermal expansion between 20 oC and 100 oC (1/ oK) 23×10-6
Preparation for surface oxidation treatment Excellent

PROPERTIES OF SUPPORT MATERIALS

Material type AISI 304
Shape Cold-rolled
Finish Heat treatment, pickled and skin-passed
Density kg/dm3 7,9
Tensile strength N/mm2 540 – 750
Elongation at 80mm (%) 45
HRB hardness 82
Material type  AISI 430
Shape Cold-rolled
Finish Heat treatment, pickled and skin-passed
Density kg/dm3 7,7
Tensile strength N/mm2 450 – 600
Elongation at 80mm (%) 20
HRB hardness 85