Table 1:
Stress Concentration Factors for Gear Design
Gear Material Type
K
δ
K
T
Cast iron and non-ferrous materials
1.40
1.75
Normalized steels (≤ 300 HVN)
1.50
1.85
Quenched & tempered steels (≤ 450 HVN)
1.60
2.00
Case-hardened steels (> 450 HVN)
1.50
1.85