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ASSY® 4 TRH gate hinge screw Steel zinc-nickel black full thread truss head
Special black full-thread screw with high corrosion resistance (500 h salt spray test), large round head and underside shank reinforcement for fastening gate fittings or metal units made of flat steel to wood
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RW recess ensures excellent power transmission
- Larger contact surface at the bit increases created power.
- More stability, one-handed working and precise positioning due to the tight-fit recess and perfect fit of the bit.
- Fewer bit changes, 1 bit for multiple screw diameters.
- Is compatible with previous AW recess.
Well-designed, flat and visible metal connection
- Flattened, round large truss head with flat contact surface under the head and integrated shank reinforcement offer a precise fit and high load transmission when used in pre-drilled round holes in metal.
Maximum resistance to over-tightening at high feed rates
- Higher load transmission in compact and hard woods due to coarse thread with reinforced, asymmetrical thread flank geometry.
- Better anchorage due to higher thread flanks.
Smooth thread start ensures optimised piercing and engaging of the screw
- Minimal splitting due to material displacement by the dome-shaped milling elements in the tip.
- Minimal friction when driving in the thread reduces the amount of force required.
High strength values and ductility
- Precise heat treatment guarantees high strength values and high ductility.
- We recommend using the Würth software or corresponding design aids for planning and designing your installation. Dimensioning of the ASSY screws can be carried out in the Würth timber construction software from a dia. of 5 mm.
- ASSY 4, ASSYplus 4 and ASSYplus 4 VG chipboard screws are optimised for use in wood and engineered woods. For applications in plastic fixings where the load 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.
ETA-11/0190 approved
The requirements of the European Technical Approval (ETA) must be observed
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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