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1–8
KC 3.15"
Torque Required to Begin Twisting Metal Hub In Plastic
3,000
2,600
2,200
1,850
1,470
1,100
750
370
0
1
2
3
Test No.
HEX 2.95"
HEX 1.42"
KC 1.57"
Blank Width = 20 mm
Lever Length = 100 mm
KC= Knurled core
Hex= Hex Core
Knurled Metal Core Advantages Over Hexagonal and Notched Metal Core
The knurled core provides better torque transmission and even heat dissipation from the shaft through the metal to the
gear teeth. The knurled core has replaced the hexagonal and notched metal cores in INTECH's manufacturing
procedure. The knurled core also allows a more uniform wall thickness in relation to both bore and root diameter,
especially in borderline cases.
As shown in Figure 1 and 2, tests performed on comparable core sizes determined that the knurled core can withstand
up to 80% higher torque than the hexagonal core.
Breakaway torque is defined as the maximum torque value at which the metal core begins to twist out of the plastic.
Figure 2
Determination of Breakaway Torque
Test No:
Knurled Core 3.15"
Hexagonal Core 2.95"
Knurled Core 1.57"
Hexagonal Core 1.42"
Axial Force (lbf)
Breakaway Torque (lb • ft)
1
2
3
1
2
3
7014
4361
2248
2248
8003
4316
2158
1349
7464
4856
–
–
2301
1431
737.5
737.5
2626
1416
708
443
2449
1593
–
–
Figure 1
INTECH Power-Core™ Gears General Info.
