... OEM orders 3, Quick delivery 4, strict quality control 45 degree o-rings mould: 1. Mould for all kinds of ... Cavity number: Single, multi-cavity3. Cavity/core steel: P20, 45#, Cr12MOV etc.4. Products Material: NBR, FPM, CR, EPDM ... can control the mould's hardness within HRC50± 3 degree, it ensure that the service life of mould ... manufacturers and won a good reputation from them. 45 degree o-rings mould