ASSY® 4 TRH gate hinge screw Steel zinc-nickel black full thread truss head
ASSY 4 TH steel, zinc-nickel, FT, round head RW
SCR-RDHD-WO-RW20-(P3R)-5X40/37
ASSY 4 TRH
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Ideal power transmission thanks to RW recess
- More power due to larger contact area at the bit
- More stability, one-handed working, precise positioning due to the tight-fit recess and perfect fit of the bit
- Fewer bit changes, one bit for many screw diameters
- Compatibility with previous AW drive
Well-designed, flat and visible metal connection
- Precise fit and high power transmission when used in pre-drilled round holes in metal thanks to flattened, semi-circular large truss head with flat contact surface under the head and integrated shank reinforcement
No over-tightening or stripping and high feed
- Higher power transmission in hardwoods due to reinforced, asymmetrical thread flank geometry of the coarse thread
- Better anchoring thanks to higher thread flanks
Smooth thread start ensures optimised recessing and biting of the screw
- Low gap effect due to displacement effect of the dome-shaped milling elements in the tip
- Friction-reduced thread rotation allows for a lower screw-in force
High strength values and ductility
- Adjusted heat treatment guarantees high strength values and high ductility
- We recommend using the Würth software or the corresponding design aids for planning and dimensioning your assembly. Use the Würth timber construction software for dimensioning of ASSY screws from a diameter of 5 mm
- ASSY 4, ASSYplus 4 and ASSYplus 4 FT chipboard screws are optimised for use in wood and wood materials. For applications in plastic anchors where load capacity can also be reduced, use only screws without an optimised thread tip (tip with milling ribs, drill tip, self-clearing groove etc.), such as the ASSY D screws with countersunk head or pan head
For steel-wood connections designed for tensile forces
The full thread starting immediately below the head allows for e.g. fitting-wood or sheet material-wood connections designed for tensile forces with high load-bearing capacity. Greater screw pull-out force is achieved by the maximum thread length.
For applications in utilisation class 1 and utilisation class 2 (from ∅ > 4 mm)
- Five times higher corrosion protection, the zinc-nickel-plated surface chromium(VI)-free 8 µm layer thickness, compared to zinc plated yellow surfaces, 500 h according to the salt spray test according to DIN EN ISO 9227
- Coloured acid protection topcoat protects against natural tannic acids
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, the right-size RW bit must be used
- For cylindrical 90° holes in the metal tab to be fastened, it is recommended to use ASSY screws with shank reinforcement (ASSY 4 Combi, ASSY plus FT 4 combi, ASSY 4 JH joist hanger screw). The gap between the hole and the screw shank should not exceed 1 mm in accordance with DIN EN 1993-1-8
- For a load-bearing wood-metal connection, ASSY screws must be tightened to a specific torque value. Tightening torque = required prevailing torque x 1.2 < 90% of the breaking torque
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