T spring heavy duty hose clamps
1 Material: W2 & w4 series
2 Bandwidth: 19mm

T-bolt Hose clamp
Bandwidth:19mm
Standard:SAE J 1508 standard
Material:W2, W4

W2 : bolt by galvanized steel, others by 200 or 300 series stainless steel

W4: All in 300 series stainless steel

Unitary hose clamp: It has different bandwidths as per the different sizes. There are 18mm, 20mm, 22mm, 24mm, 26mm bandwidths, the bigger bandwidth is used for bigger sizes. The band thickness is also different for different bandwidths.
Regarding the material, it can be divided into the following three types:
W1-- all of the parts are silvery or golden galvanized steel;
W2-- the bolt, Axis and coupling are galvanized steel, other parts are 300ss stainless steel;
W4-- all of the parts are 304ss stainless steel