KSI Koei Coupling 
Koei Spring Industry Co.,Ltd

KK-4
KK-6
KK-11
KK-16
KK-20
KK-25
KK-30
KK-40
KK-50
KK-60

KF-6
KF-11
KF-16
KF-20
KF-25
KF-30
KF-40
KF-50
KF-60

FF-6
FF-11
FF-16
FF-20
FF-25
FF-30
FF-35
FF-40
FF-50
FF-60

NS-4
NS-6
NS-10
NS-12
NS-16

NC-4
NC-6
NC-10
NC-12
NC-16