icc-es-logo-green
ESR-5931
European Technical Assessment
ETA-11/0190

Explore

Introducing the new ASSY®4, Würth’s highest-performing wood screw yet. With over 1,400 dimensions and enhanced design features, it delivers superior performance and reliability for timber construction applications.

NEW BIT

The larger contact surfaces on the new RW drive allow for even better torque transmission

NEW Drive

The larger contact surfaces on the new RW drive allow for even better torque transmission

NEW MILLING SHANK

Moving the milling shank up into the thread allows for easier driving in of the screw.

NEW THREAD

The new thread pulls boards together much better.

NEW Tip

The gently expanding tip with a linear rise in the counter thread reduces splitting

FEWER BIT CHANGES

RW 20 drive for screws from 3.5 to 5 mm in diameter. RW 40 for all dimensions from 5 to 10 mm in diameter. In practice, this means: Joiners and carpenters can use a single bit for a wide range of applications.

MORE POWER

The deeper recess of the screw, the broader wing area and the larger contact surfaces of the bit provide for the improved performance of the new RW drive.

HIGHER PERFORMANCE

AW drive and RW drive are compatible in use. However, the new RW drive delivers a better performance.
Before / After

The milling shank integrated in the thread reduces the effort needed to drive in the screw and minimizes the risk of injuries caused by metal chips. Driving in the screw is easier, faster and safer.

THE PERFORMANCE FACTOR
  • Better pulling power when joining two boards
  • No overtightening in the end grain when joining corners
  • Higher level of friction locking in connections of loadbearing structures in timber construction

The new thread geometry joins boards in cabinet building and load-bearing connections in timer construction even better and prevents overtightening, e.g. when joining corners.

A NEW TIP FOR EVEN LESS SPLITTING
THE PERFORMANCE FACTOR
  • Even better positioning and biting
  • Even less splitting

The gently expanding tip with a linear rise in the milling ribs reduces splitting. In addition, the screw bites more quickly and can be driven in the wood with less effort.

COUNTERSUNK ASSY SCREW

Fully Threaded
Special full-thread screw with countersunk head with milling pockets for universal use for high-load-bearing wood-wood, wood-metal connections or reinforcements in structural wood construction, which also require small edge and screw clearances, in indoor dry or wet areas.
Details

CYLINDER HEAD ASSY SCREW

Fully Threaded
Special full-thread screw with small cylinder head for high-load-bearing wood-wood connections or reinforcements in structural wood construction, which also require small edge and screw clearances, in indoor dry or wet areas.
Details

HEX HEAD ASSY SCREW

Fully Threaded
Special full-thread screw with hexagon head and underside shank reinforcement for high-load-bearing metal-wood connections in structural wood construction, which also require small edge and screw clearances, in indoor dry or wet areas.
Details

REVERSE CYLINDER HEAD ASSY SCREW

Special full-thread screw with external lugs head for high-load-bearing reinforcements of hall girders, where small edge and screw clearances are also required, in indoor dry or humid areas.
Details

WASHER HEAD ASSY SCREW

Fully Threaded
Full-thread screw with large washer head for fastening metal parts or thin plywood boards in the packaging area in wood in indoor dry or sheltered areas.
Details

COMBI T TRANSPORTATION ASSY SCREW

Special transport anchor screw with shank-reinforced screw head for safe, clearance-reduced attachment in the matched ball head anchor for transporting wooden elements made of coniferous timber, laminated timber, timber veneer or board plywood.
Details

COUNTERSUNK ASSY SCREW

Partially Threaded
Universal partial-thread screw with washer head for wood-to-wood fastening, 90° or angled screw connection in structural timber construction in indoor dry or sheltered areas.
Details

FLAT WASHER HEAD ASSY SCREW

Partially Threaded
Universal partial-thread screw with washer head or plate head for wood-to-wood fastening, 90° or angled screw connection in structural timber construction in indoor dry or humid areas.
Details

HEX HEAD ASSY SCREW

Partially Threaded
Universal partial-thread screw with washer head for wood-to-wood fastening, 90° or angled screw connection in structural timber construction in indoor dry or sheltered areas.
Details

WASHER HEAD ASSY SCREW

Partially Threaded
High-strength partial-thread screw with shank reinforcement for wood-to-wood fastening with washer or precise 90° metal-to-wood fastening in timber construction in indoor dry or humid areas.
Details

WASHER HEAD A2 ASSY SCREW

Partially Threaded
Partial-thread screw made of high-quality austenitic stainless steel A2 with large washer head for wood-to-wood fastening in exposed outdoor areas.
Details