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ASSY® 4 COMBI timber screw Zinc flake surface partial thread hexagon head
Powerful partially threaded screw with shank reinforcement for wood-wood fastening with washer or precisely fitting 90° metal-wood fastening in exterior timber construction.
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Ideal power transmission thanks to RW drive
- 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, 1 bit for many screw diameters
- Compatibility with previous AW drive
Precise fit in metal and very high power transmission combined with variably selectable drive types
- Shank reinforcement integrated on the underside
- Combination of hexagon and RW drive
Significant reduction in the amount of force required when turning the screw
- Less splitting when countersinking the shank due to the displacement milling effect of the milling shank
- Minimised risk of screw breakage due to high breaking torque
- Reduced risk of injury from protruding metal chips due to the integration of the milling shank into the thread
- High protection of the application tools
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 reduction of the screw-in force to be applied
High strength values and ductility
- Adjusted heat treatment guarantees high strength values and high ductility
ETA-11/0190 approved
The requirements of the European Technical Approval (ETA) must be observed
For wood-wood connections designed to pull together
The partial thread starting immediately below the shank allows for wood-wood connections designed to pull together. The screw thread is positioned entirely in the lower component once screwed in.
Can be used for outdoor applications and usage class 3 according to EN 1995-1-1
- Five times higher corrosion protection of the zinc-flake surface, chrome(VI)-free, 20 µm layer thickness, 1000h to salt spray test according to DIN EN ISO 9227
- Usage class C4 according to EN ISO 12944-2
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, use the exact fitting RW bit.
- For cylindrical 90° holes in the metal tab to be fastened, we recommend 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 with a tightening torque. Tightening torque = required prevailing torque x 1.2 < 90% of the breaking torque
- To increase the contraction effect or head pull-through resistance, we recommend combining the precisely fitting washers for ASSY 4
- Partial-thread screws are ideal for connecting wood-wood structures. In order to achieve the best possible component assembly, the thickness of the component to be mounted must not be greater than the length of the shank
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