ASSY® 4 Isotop roofing screw Steel zinc plated double thread cylinder head
ASSY 4 Isotop steel zinc plated PT cheese head RW
SCR-CYL-ISOTOP-WO-RW40-(A3K)-8X300/60
ASSY 4 ISOTOP
Register now and access more than 125,000 products
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, one bit for many screw diameters
- Compatibility with previous AW drive
Unobtrusive mounting of wooden components
- Small head diameter for unobtrusive mounting
- Low splitting effect when countersinking the screw head
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
- Reduced splitting 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
Ideal for flexible loads such as insulation on rafters
- Bridging non-load-bearing spaces
- 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
- Do not use for screw applications with direct exposure to the elements or in humid rooms with atmospheres containing chlorine gas
- 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
ETA-11/0190 approved
The requirements of the European Technical Approval (ETA) must be observed
Datasheets(X)
For wood-wood connections designed for anchoring
The double thread with internal shaft area enables a wood-wood connection designed for anchoring. This enables a non-load-bearing layer to be bridged. The larger outer diameter of the upper thread increases the head pull-through value.
For applications in utilisation class 1 and utilisation class 2 (from ∅ > 4 mm)
- High-quality surface protection, zinc, blue-passivated chromium(VI)-free 8 µm layer thickness
- Suitable for use in utilisation class 1 (interior) and from a ∅ > 4 mm in utilisation class 2 (covered outdoor area) according to EN 1995-1-1:2010-12 + DIN SPEC 1052-100:2013-08
- The requirement of classification T2/C2 is fulfilled in accordance with prEN 14592:2017 (D)
- ASSY screws are approved for quasi-static loads
- For optimum use of the screw, the right-size RW bit must be used
- For long screws arranged in a cross shape or in a screw block with narrow edge clearances, it is advisable to drill pilot holes or use a screw-in aid to avoid intersecting of the screws
 | |
Nominal diameter (d) | 8 mm |
Nominal diameter 2 | 10 mm |
Thread length (lg) | 60 mm |
Head thread length | 70 mm |
Length (l) | 300 mm |
Head type | Socket head |
Head diameter (dh) | 11 mm |
Head height (k) | 9 mm |
Internal drive | RW40 |
Thread type | Wood screw thread |
Thread design | Double thread |
Thread form | Coarse thread |
Core diameter | 5.3 mm |
Core diameter of head thread | 6.3 mm |
Angle of the tip | 34 Degree |
Shape of tip | Tip with hilltop milling cutter |
Material | Unhardened steel |
Surface | Zinc plated |
Min./max. screw-in angle | 0-90 Degree |
Product weight (per item) | 85.760 g |
Suitable for use in the following materials | Board ply wood (BSP), Wood, Derived timber product, Hardwood, LVL, Softwood |
Area of application | On rafter insulation, Façade insulation |
Additional accessory | Screw template for ASSY ® ISOTOP chipboard screw |
Additional articles | Data sheets for over-rafter insulation |
Screw requiring approval | Yes |
Approval | ETA-11/0190 |
RoHS-compliant | Yes |
Select RAL-colour code
!! NOTE: On-screen visualisation of the colour differs from real colour shade!!
Last viewed
Monier pliers DIN 5242
Refills for construction markers in impact-resistant magazine
1/4 inch socket wrench insert, metric short
Circlip pliers, shape A for shaft circlips
Wood connector plate
1/4-inch socket wrench insert, TX head For external TX screws
Tiomos Tipmatic Plus Click-on hinge
Combination filter A2P3 RD For breathing protection series 175
Adapter For plug-in tools Plus to Max
Mixer extension WIT-MV, flexible