{"id":1495,"date":"2026-04-10T02:34:38","date_gmt":"2026-04-10T09:34:38","guid":{"rendered":"https:\/\/www.songhaiflanges.com\/?p=1495"},"modified":"2026-04-10T02:37:05","modified_gmt":"2026-04-10T09:37:05","slug":"flange-size-charts-how-to-read-asme-b16-5-dimension-tables","status":"publish","type":"post","link":"https:\/\/www.songhaiflanges.com\/pl\/flange-size-charts-how-to-read-asme-b16-5-dimension-tables\/","title":{"rendered":"Flange Size Charts: How to Read ASME B16.5 Dimension Tables"},"content":{"rendered":"

Flange Size Charts: Complete Guide to ASME B16.5 Dimensions<\/h2>\n

Published:<\/strong> April 10, 2026 | Category:<\/strong> Technical Guide<\/p>\n

Introduction<\/h3>\n

A flange size chart is your roadmap to selecting the right flange. ASME B16.5 organizes dimensions by Nominal Pipe Size (NPS)<\/strong> and Pressure Class<\/strong> (150-2500).<\/p>\n

Key Dimensions<\/h3>\n
    \n
  1. Outside Diameter (OD)<\/strong> – Overall flange diameter<\/li>\n
  2. Bolt Circle Diameter (BCD)<\/strong> – Circle through bolt hole centers<\/li>\n
  3. Number of Bolt Holes<\/strong> – Increases with pressure class<\/li>\n
  4. Flange Thickness<\/strong> – Increases with pressure<\/li>\n
  5. Raised Face Height<\/strong> – 1\/16″ for 150-300#, 1\/4″ for 400#+<\/li>\n<\/ol>\n

    Sample Table (NPS 4″)<\/h3>\n\n\n\n\n\n\n\n
    Class<\/th>\nOD<\/th>\nBCD<\/th>\nBolts<\/th>\nThickness<\/th>\n<\/tr>\n<\/thead>\n
    150#<\/td>\n9.00″<\/td>\n7.50″<\/td>\n8×5\/8″<\/td>\n0.88″<\/td>\n<\/tr>\n
    300#<\/td>\n10.00″<\/td>\n8.50″<\/td>\n8×3\/4″<\/td>\n1.12″<\/td>\n<\/tr>\n
    600#<\/td>\n10.75″<\/td>\n9.25″<\/td>\n12×3\/4″<\/td>\n1.38″<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    How to Use a Flange Chart<\/h3>\n
      \n
    1. Identify pipe size (NPS)<\/li>\n
    2. Determine pressure class<\/li>\n
    3. Look up dimensions<\/li>\n
    4. Cross-check mating components<\/li>\n<\/ol>\n

      Common Mistakes<\/h3>\n