... are made of nitrile butadiene rubber(NBR).Thread specificaiton: Metric ,PG,G,NPT.Working Temperature : -40 to 100 centigrade in ... 920924100HSK-M20GHSK-M20BM20X1.56~1220924100HSK-M20G-DHSK-M20B-DM20X1.58~1420102750HSK-M22G-HHSK-M22B-HM22X1.56~1222102750HSK-M22GHSK-M22BM22X1 ... -M24G-HHSK-M24B-HM24X1.56~1224102750HSK-M24GHSK-M24BM24X1.58~1424102750HSK-M25G-HHSK-M25B-HM25X1.511~1625113350HSK-M25GHSK- ...