Type: SO , SOA , SOS , BSO , BSOA , BSOS , SO4 , BSO4 , TSO , TSOS , TSOAFeatures: 1) Used for applications requiring closed thread ends 2) Blind end limits screw penetration and excludes foreign matter 3) Thread size: #4 to 1/4"and M3 to M6 4) We also make many kinds of non-standard components and heterotypic Parts are processed and manufactured according to customers'' designs, ....