Small animals tend to live shorter lives than larger animals. There are a few theories as to why that is, but the one I believe is most popular is: small animals tend to live shorter lives anyway (because of threats from predators), so there are fewer opportunities to evolve to be long-lived.
The American National Standards Institute (ANSI) Class 150 is a system of dimensional standards for weld neck, threaded, slip-on, lap joint, socket weld and blind flanges. Dimensions for facing, bolts and studs are also included in ANSI Class 150. ANSI Class 150 establishes measures for pipe sizes.
Flange/ Clamp For Turbine Outlet S400 - 4.62 S4F/C - 4.62 $99.00 : FLANGE T-6 FT6CNC $145.00 : Stainless Diesel HE351 To HX40 Adapter SDHE3512HX40 $89.00 : S400 Aluminum Cover Side Flange S4ALflange $75.00 : S-400 Flange replacement O-ring S4FBLKoring $8.99 : Hx35 and Hx40 replacement elbow O-ring HXRPOR $8.99 : HX-82 Exhaust outlet flange HX82EOF $75.00 : S-400 Aluminum elbow replacement O-ring S4ALMERORING $8.99 : S-300 Flange replacement O-ring S3FORGoring $8.99 : GT-55 Exhaust outlet flange GT55EOF $75.00 : S-500 Exhaust outlet flange S5EOF $75.00