TAPTITE® screws were the leap forward in high production assembly using threaded fasteners.  DUO-TAPTITE® screws represent the refinement of the TRILOBULAR® principle for specific demanding applications.

DUO-TAPTITE® screws have generous lobulation at the screw point for easy entry and optimum thread forming action plus reduced lobulation in the screw body holding area.  A stabilizing threaded dog point insures ready, aligned entry, with easy pick-up requiring minimal starting end load.

DUO-TAPTITE® screws & bolts are available in inch and metric sizes, with head style to suit.

Advantages of DUO-TAPTITE® Fasteners

  • High vibrational resistance
  • Good axial alignment
  • Low end load
  • High strip-to-drive ratio
  • High prevailing torque
  • Good torque tension relationship

Better starting stability - Axial Alignment

Less cocking at start of driving operation ... the self-aligning characteristic of DUO-TAPTITE® screws reduces operator fatigue; eliminates interruptions in production; adds speed to every fastening operation. Suitable for automated and robotic assembly.

TYPICAL ANGULARITY
DUO-TAPTITE® COMPETITIVE ROUND-BODIED THREAD-FORMING SCREW

Lower starting end pressure combines with lower driving torque to reduce time and power costs right down the line.

Higher strip-to-drive ratio

The higher, more uniform, strip-to-drive torque ratio of DUO-TAPTITE® screws provides a built-in safety factor against over-driving. Eliminates broken screws, damaged mating threads and inferior fastenings.
 

Higher prevailing torque

Superior elastic action of a DUO-TAPTITE® screw gives it better locking characteristics than many fasteners specifically designed as locking screws! Competitive round-bodied, thread-forming fasteners have no locking torque. Graph shows comparison of DUO-TAPTITE® screw with IFI-124 minimum requirement for self-locking screws.

Torque-tension comparison M8 x 1.25 DUO-TAPTITE® vs. TAPTITE® Fasteners

Superior tension at any given applied torque (with normal clamping pressure) is a major factor in the better holding capability of a DUO-TAPTITE® screw.

Note: This graph represents a linear calculation based on statistical data of the respective screws.

NOTE: All screws were tested in unthreaded weld nuts of uniform hardness (Rockwell B 82-84) having 7.1mm hole diameters. End pressure was manually developed, measured and recorded by an electronic load cell and recorder. Drive, prevailing and strip torque values, and torque-tension values were measured with a GSE torque cell and recorded on a BLH electronic recorder. All test data is based on 5/16-18 or M8 x 1.25 screws.

DUO-TAPTITE® Brochures