Cart Stainless Steel Nipples Stainless Steel nipples are schedule 40 or class 150. We offer 316 and 304 stainless steel. View cart “1-1/4″ x 3-1/2″ 316 Stainless Steel Nipple” has been added to your cart. 1/4" Stainless Steel Nipples (11) 1/2" Stainless Steel Nipples (11) 3/4" Stainless Steel Nipples (11) 1" Stainless Steel Nipples (10) 1-1/4" Stainless Steel Nipples (10) 1-1/2" Stainless Steel Nipples (10) 2" Stainless Steel Nipples (9)