BosScrew™ Product Details PDF
BosScrew™ Info Sheet PDF

BosScrew Figure 1

The ITW Shakeproof BosScrew™ is the only screw for plastics that is designed not to loosen. Its unique thread form, designed with the patented WERCS® technology, works directly with the creeping aspect of plastic to interlock with the boss. The BosScrew™ utilizes standard head diameters and has the highest drive-to-strip ratio in the industry. This is the maximum performance fastener for most plastic applications. Time, temperature, and vibration only strengthen the joint.

  • Reduce parts in an assembly; no more inserts
  • Permits the design of shorter bosses-save material
  • No spring components needed in the joint
  • Savings in service issues due to fasteners
  • SEMS - add a washer under the head to span larger holes, protect fragile surfaces, and distribute load.
    WERCS® Technology:
  • ITW’s new WERCS® Technology is revolutionizing the design and manufacturing of threaded products. This technology allows the formation of unique geometries on the thread. Utilizing the WERCS® Technology, ITW has developed a suite or platform of innovative threaded products — products designed to dramatically advance fastening performance, increase manufacturing efficiency and reduce overall installed cost.
BosScrew Figure 2

Boscrew Hole Size Info

Boscrew Hole Size Info 2
Typical Mean Pilot Hole
Screw Size Inches (in.) Millimeters (mm)
#4 0.090 2.30
M3 0,093 2.37
#6 0.122 3.10
M3.5 0.122 3.10
#8 0.132 3.36
#10 0.154 3.92
M4 0.132 3.50
M5 0.154 3.90
M5.7 0.170 4.32
M6 0.186 4.80
1/4 0.210 5.33
M6.3 0.209 5.31
M8 0.248 6.30
5/16 0.265 6.73
3/8 0.286 7.27
* Approved recommendations with Acetal Nylon ABS and PBT or equivilant materials