 HI - LO Fastener for:
Plastics, Particle Board, Masonite and Wood
The Hi-Lo fastener, with its unique thread form, designed
and engineered
by Shakeproof, a division of Illinois Tool Works Inc., improves
fastener
performance in a broad range of low density materials such
as plastics,
wood, masonite and particle board.
The fastener is designed with a double lead consisting of
a high and a
low thread. The high thread is flatter and sharper than a
conventional
thread, having a 3Ø0 included angle as compared to
the conventional 60°
included angle. The low thread has the 60° included angle
and has a
height ranging from 40% to 50% of the high thread height.
ADVANTAGES OF THE HI-LO FASTENER
• Reduced cracking or splitting of the workpiece
• Reduced boss breakage
• Greater pull-out strength
• Lower driving torque
• Higher stripping torque
| Thread
Form In Soft or Hard Materials |
The threads of the Hi-Lo Plus fasteners have a unique
bi-level shape that directs the displaced material
upward, flowing it around the threads.
Heads
on Hi-Lo Plus fasteners are made to standard
ANSI/ASME dimensions. |
 |
In
forming mating heads in the work piece, the unique
Hi-Lo Plus Screw accommodates the displaced material
between the widely spaced high threads, actually
increasing thread engagement while minimizing outward
pressure.
The
30° included angle of the high thread displaces
less material when it is driven into the mating
plastic, and therefore, requires lower driving
torques. A greater amount of material remains
between the high threads, increasing the stripping
torque. Low driving torque and high stripping
torque provides maximum protection against stripping
failures. |
Conventional
Thread Form |
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| Hi-Lo
Plus Thread Form |
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|
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