Thread Rite Screw Products - Fasteners Thread Rite Screw Products - Fasteners Thread Rite Screw Products - Fasteners Thread Rite Screw Products - Fasteners Thread Rite Screw Products - Fasteners
Thread Rite Screw Products - Fasteners Thread Rite Screw Products - Fasteners
Thread Rite Screw Products - Fasteners
Thread Rite Screw Products - Fasteners
Thread-Rite Screw Products - Fasteners
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Hi - Lo Plastic Tapping Screws

Hi Lo ScrewHI - LO Screws 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 HI-LO 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.

HI LO FASTENERS

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
HI LO FASTENERS
Hi-Lo Plus Thread Form
HI LO FASTENERS





Screw Size High Thread Diameter Low Thread Diameter(P) Point Diameter Recommended Pilot Hole Diameter
Max Min.
4-26 .1150 .1090 .096 .072 .086
5-22 .1270 .1200 .108 .078 .099
6-22 .1480 .1420 .129 .099 .110
7-21 .1580 .1520 .135 .099 .120
8-19 .1700 .1640 .145 .105 .128
10-18 .1950 .1890 .168 .122 .144
11-18 .2100 .2000 .183 .137 .162

HI-LO And HI-LO Plus Fasteners Drive Torques VS. Strip Torques

3/8 ABS

Screw Size .120 Hole Diameter .128 Hole Diameter

.136 Hole Diameter

.144 Hole Diameter .152 Hole Diameter
  Drive Strip Diff Drive Strip Diff Drive Strip Diff Drive Strip Diff Drive Strip Diff
7-19 HILO 3.7 24.6 20.9 2.8 20.7 17.9                  
7-21PLUS 5.1 33.3 28.2 4.0 31.0 27.0                  
8-18 HILO 4.1 35.4 31.3 2.8 26.3 23.5 2.3 21.2 18.9 1.5 15.1 13.6      
8-19 PLUS 5.7 40.7 35.0 4.7 41.0 36.3 3.8 35.8 32.0 2.3 24.0 21.7      
10-16HILO                   5.0 36.5 31.5 3.7 32.4 28.7
10-18 PLUS                   8.1 51.8 43.7 6.0 51.1 45.1

3/8 NYLON

Screw Size .128 Hole Diameter

.136 Hole Diameter

.144 Hole Diameter .152 Hole Diameter
  Drive Strip Diff Drive Strip Diff Drive Strip Diff Drive Strip Diff
7-19 HILO 3.6 26.1 22.5 3.0 19.2 16.2            
7-21PLUS 6.7 41.6 34.9 4.3 29.5 25.2            
8-18 HILO 6.6 35.5 28.9 5.2 30.1 24.9 3.5 19.9 16.4      
8-19 PLUS 10.5 54.4 43.9 7.5 48.6 41.1 4.3 33.6 29.3      
10-16HILO             5.0 36.5 31.5 3.7 32.4 28.7
10-18 PLUS             8.1 51.8 43.7 6.0 51.1 45.1

 

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