ʻO ka GF Coupling he ʻelua mau pahu kila me nā niho lei aliʻi waho a me ka barreled gear, Oxidation blacked protection, i hoʻopili ʻia e kahi lima resin synthetic. Hana ʻia ka lima mai ka polyamide kiʻekiʻe molecular weight, thermally conditioned a impregnated me ka lubricant paʻa e hāʻawi i kahi ola mālama ʻole lōʻihi. He kūpaʻa kiʻekiʻe kēia lima i ka haʻahaʻa o ka lewa a me kahi pae wela hana o -20˚C a +80˚C me ka hiki ke kū i 120˚C no nā manawa pōkole.