Ring Spacer Flange Manufacturer Landee supplies ASTM A105 Flat Face Ring Spacer Flange, JIS B2212, BS 3293, PN64, 1/2-24 Inch. Name: Ring Spacer Flange. Type: Spacer Flange. Material: ASTM A105. Grade: F316H, F310, F321. Face: FF. Standard: JIS B2212, BS 3293. Pressure: PN64 (400LB). Size: 1/2-24 Inch (DN15-DN600). Size: 1 1/2 Inch (DN40).