{"id":259,"date":"2025-11-11T11:16:46","date_gmt":"2025-11-11T11:16:46","guid":{"rendered":"https:\/\/neelamforgeindia.com\/others\/?p=259"},"modified":"2026-07-20T10:26:47","modified_gmt":"2026-07-20T10:26:47","slug":"flange-dimensions-chart-in-mm","status":"publish","type":"post","link":"https:\/\/neelamforgeindia.com\/others\/flange-dimensions-chart-in-mm\/","title":{"rendered":"Flange Dimensions Chart in MM & PDF"},"content":{"rendered":"\n

SS Flange Standard Dimensions Chart in mm & PDF\n<\/h2>\n

Check Flange Dimensions Chart in MM of Class 150<\/strong>, Flange Class 300, Flange Class 600, Class 900 Flange, Class 1500 Flange, Class 2500 Flange Dimensions.<\/p>\n

Flange Dimensions Chart & Standards\n<\/h2>\n

Selecting the right flange is essential for ensuring leak-proof, reliable piping performance. All the critical measurements in our SS Flange<\/a> dimension charts are in millimeters (mm) to enable the engineer, fabricator, and the buyer to make the right choice on the size to be used. We offer description of all standard flanges of steel, Class 150, Table H, and even dimensions of well-known nominal pipe sizes such as 4-inch flanges. You Can Whatsapp us your query at +91 96642 18138<\/a>.<\/p>\n\n\n

A Note on Flange Types vs. Facing Types<\/h3>\n

Weld Neck, Slip-On, Blind, Socket Weld, and Lap Joint describe the body style<\/b> of a flange \u2014 how it connects to the pipe. Raised Face (RF) and Flat Face (FF) describe the facing<\/b> \u2014 the surface finish where the gasket seats \u2014 and can apply to almost any of the body styles above. A flange is typically specified as both together, for example “6-inch Class 150 Weld Neck, Raised Face.”<\/p>\n

\n \n \n \n \n \n \n \n \n \n \n \n
Flange Type<\/th>\n Standard<\/th>\n Nominal Pipe Size (NPS)<\/th>\n Outer Diameter (OD)<\/th>\n Bolt Circle Diameter (BCD)<\/th>\n Number of Bolts<\/th>\n Bolt Hole Diameter<\/th>\n <\/tr>\n
Weld Neck<\/td>\n ANSI<\/td>\n 2\u201d<\/td>\n 6.00\u201d<\/td>\n 4.75\u201d<\/td>\n 4<\/td>\n 0.75\u201d<\/td>\n <\/tr>\n
Slip On<\/td>\n ANSI<\/td>\n 3\u201d<\/td>\n 7.50\u201d<\/td>\n 6.00\u201d<\/td>\n 4<\/td>\n 0.88\u201d<\/td>\n <\/tr>\n
Blind<\/td>\n DIN<\/td>\n 4\u201d<\/td>\n 9.00\u201d<\/td>\n 7.50\u201d<\/td>\n 8<\/td>\n 0.75\u201d<\/td>\n <\/tr>\n
Socket Weld<\/td>\n ANSI<\/td>\n 6\u201d<\/td>\n 11.00\u201d<\/td>\n 9.50\u201d<\/td>\n 8<\/td>\n 0.88\u201d<\/td>\n <\/tr>\n
Lap Joint<\/td>\n JIS<\/td>\n 8\u201d<\/td>\n 13.50\u201d<\/td>\n 11.75\u201d<\/td>\n 8<\/td>\n 1.00\u201d<\/td>\n <\/tr>\n
Threaded<\/td>\n ANSI<\/td>\n 1\u201d<\/td>\n 4.50\u201d<\/td>\n 3.50\u201d<\/td>\n 4<\/td>\n 0.50\u201d<\/td>\n <\/tr>\n
Raised Face<\/td>\n ANSI<\/td>\n 3\u201d<\/td>\n 7.50\u201d<\/td>\n 6.00\u201d<\/td>\n 4<\/td>\n 0.88\u201d<\/td>\n <\/tr>\n
Flat Face<\/td>\n ANSI<\/td>\n 4\u201d<\/td>\n 9.00\u201d<\/td>\n 7.50\u201d<\/td>\n 8<\/td>\n 0.75\u201d<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n<\/div>\n

SS Flange Standard Dimensions Chart in mm<\/h2>\n

Check Flange Dimensions Chart in MM for Class 150<\/strong>, and reference data for Table H flanges and 4-inch nominal bore sizes below.<\/p>\n\n

Class 150 Flange Dimensions (in mm)<\/h2>\n

Class 150 is one of the most widely used pressure ratings in industrial piping. The table below gives outside diameter, flange thickness, and approximate weight for socket weld\/slip-on (SOW\/SW), weld neck (WN), and blind flanges, all in millimetres, per ASME B16.5.<\/p>\n

\n \n \n \n \n
NOMINAL SIZE<\/th>\n DIMENSIONS<\/th>\n WEIGHT (KG)<\/th>\n <\/tr>\n
NPS
(Inches)<\/th>\n 		DN (mm)<\/th>\n FLANGE
MM<\/th>\n 		FLANGE
THICKNESS<\/th>\n 		SOW
SW<\/th>\n 		WN<\/th>\n BLIND<\/th>\n <\/tr>\n
1\/2<\/td>15<\/td>88.9<\/td>11.2<\/td>0.4<\/td>0.5<\/td>0.4<\/td><\/tr>\n
3\/4<\/td>20<\/td>98.6<\/td>12.7<\/td>0.6<\/td>0.7<\/td>0.6<\/td><\/tr>\n
1<\/td>25<\/td>108<\/td>14.2<\/td>0.8<\/td>1<\/td>0.9<\/td><\/tr>\n
1 1\/4<\/td>32<\/td>117.3<\/td>15.7<\/td>1<\/td>1.3<\/td>1.2<\/td><\/tr>\n
1 1\/2<\/td>40<\/td>127<\/td>17.5<\/td>1.3<\/td>1.7<\/td>1.5<\/td><\/tr>\n
2<\/td>50<\/td>152.4<\/td>19.1<\/td>2.1<\/td>2.6<\/td>2.4<\/td><\/tr>\n
2 1\/2<\/td>65<\/td>177.8<\/td>22.4<\/td>3.3<\/td>4.1<\/td>3.9<\/td><\/tr>\n
3<\/td>80<\/td>190.5<\/td>23.9<\/td>3.9<\/td>4.9<\/td>4.9<\/td><\/tr>\n
3 1\/2<\/td>90<\/td>215.9<\/td>23.9<\/td>4.8<\/td>6.1<\/td>6.2<\/td><\/tr>\n
4<\/td>100<\/td>228.6<\/td>23.9<\/td>5.3<\/td>6.8<\/td>7.0<\/td><\/tr>\n
5<\/td>125<\/td>254<\/td>23.9<\/td>6.1<\/td>8.6<\/td>8.6<\/td><\/tr>\n
6<\/td>150<\/td>279.4<\/td>25.4<\/td>7.5<\/td>10.6<\/td>11.3<\/td><\/tr>\n
8<\/td>200<\/td>342.9<\/td>28.4<\/td>12.1<\/td>17.6<\/td>19.6<\/td><\/tr>\n
10<\/td>250<\/td>406.4<\/td>30.2<\/td>16.5<\/td>24<\/td>28.6<\/td><\/tr>\n
12<\/td>300<\/td>482.6<\/td>31.8<\/td>26.2<\/td>36.5<\/td>43.2<\/td><\/tr>\n
14<\/td>350<\/td>533.4<\/td>35.1<\/td>34.6<\/td>48.4<\/td>58.1<\/td><\/tr>\n
16<\/td>400<\/td>596.9<\/td>36.6<\/td>44.8<\/td>60.6<\/td>76.1<\/td><\/tr>\n
18<\/td>450<\/td>635<\/td>39.6<\/td>48.9<\/td>68.3<\/td>93.7<\/td><\/tr>\n
20<\/td>500<\/td>698.5<\/td>42.9<\/td>61.9<\/td>84.5<\/td>122.0<\/td><\/tr>\n
24<\/td>600<\/td>812.8<\/td>47.8<\/td>86.9<\/td>115<\/td>185.0<\/td><\/tr>\n <\/tbody>\n <\/table>\n<\/div>\n\n

Table H Flange Dimensions<\/h2>\n

Table H is a legacy BS10 (British Standard) flange designation, still commonly specified in India and other markets with British-standard piping heritage, particularly for cast iron and lower-pressure applications. It is a separate specification from ASME B16.5, DIN, and JIS, so Table H flanges should not be mixed with those standards on the same piping system without confirming compatibility. Dimensions below are given in inches, matching how Table H is conventionally published; ask our team for a millimetre conversion for any specific size if needed.<\/p>\n

\n \n \n \n \n
Nominal<\/b><\/td>\n Dia. of Flange<\/b><\/td>\n I.D. of Flange<\/strong><\/td>\n Dia. of Bolt Circle<\/b><\/td>\n No. of<\/b><\/td>\n Dia. of Bolt<\/b><\/td>\n Thickness<\/b><\/td>\n <\/tr>\n
Pipe Size<\/b><\/td>\n D<\/strong><\/td>\n d5<\/strong><\/td>\n k<\/strong><\/td>\n Holes<\/b><\/td>\n d2<\/strong><\/td>\n b<\/strong><\/td>\n <\/tr>\n
1\/2″<\/td>3.3\/4″<\/td>7\/8″<\/td>2.5\/8″<\/td>4<\/td>1\/2″<\/td>3\/8″<\/td><\/tr>\n
3\/4″<\/td>4″<\/td>1.3\/32″<\/td>2.7\/8″<\/td>4<\/td>1\/2″<\/td>3\/8″<\/td><\/tr>\n
1″<\/td>4.3\/4″<\/td>1.23\/64″<\/td>3.7\/16″<\/td>4<\/td>5\/8″<\/td>3\/8″<\/td><\/tr>\n
1.1\/4″<\/td>5.1\/4″<\/td>1.45\/64″<\/td>3.7\/8″<\/td>4<\/td>5\/8″<\/td>1\/2″<\/td><\/tr>\n
1.1\/2″<\/td>5.1\/2″<\/td>1.15\/16″<\/td>4.1\/8″<\/td>4<\/td>5\/8″<\/td>1\/2″<\/td><\/tr>\n
2″<\/td>6.1\/2″<\/td>2.7\/16″<\/td>5″<\/td>4<\/td>5\/8″<\/td>5\/8″<\/td><\/tr>\n
2.1\/2<\/td>7.1\/4″<\/td>2.15\/16″<\/td>5.3\/4″<\/td>8<\/td>5\/8″<\/td>5\/8″<\/td><\/tr>\n
3″<\/td>8″<\/td>3.37\/64″<\/td>6.1\/2″<\/td>8<\/td>5\/8″<\/td>5\/8″<\/td><\/tr>\n
3.1\/2″<\/td>8.1\/2″<\/td>4.5\/64″<\/td>7″<\/td>8<\/td>5\/8″<\/td>3\/4″<\/td><\/tr>\n
4″<\/td>9″<\/td>4.37\/64″<\/td>7.1\/2″<\/td>8<\/td>5\/8″<\/td>3\/4″<\/td><\/tr>\n
5″<\/td>11″<\/td>5.43\/64″<\/td>9.1\/4″<\/td>8<\/td>3\/4″<\/td>7\/8″<\/td><\/tr>\n
6″<\/td>12″<\/td>6.23\/32″<\/td>10.1\/4″<\/td>12<\/td>3\/4″<\/td>7\/8″<\/td><\/tr>\n
7″<\/td>13.1\/4″<\/td>7.5\/8″<\/td>11.1\/2″<\/td>12<\/td>3\/4″<\/td>7\/8″<\/td><\/tr>\n
8″<\/td>14.1\/2″<\/td>8.23\/32″<\/td>12.3\/4″<\/td>12<\/td>3\/4″<\/td>1″<\/td><\/tr>\n
9″<\/td>16″<\/td>9.23\/32″<\/td>14″<\/td>12<\/td>7\/8″<\/td>1″<\/td><\/tr>\n
10″<\/td>17″<\/td>10.7\/8″<\/td>15″<\/td>12<\/td>7\/8″<\/td>1″<\/td><\/tr>\n
12″<\/td>19.1\/4″<\/td>12.7\/8″<\/td>17.1\/4″<\/td>16<\/td>7\/8″<\/td>1.1\/8″<\/td><\/tr>\n
14″<\/td>21.3\/4″<\/td>14.9\/64″<\/td>19.1\/2″<\/td>16<\/td>1″<\/td>1.1\/4″<\/td><\/tr>\n
16″<\/td>24″<\/td>16.5\/32″<\/td>21.3\/4″<\/td>20<\/td>1″<\/td>1.1\/4″<\/td><\/tr>\n
18″<\/td>26.1\/2″<\/td>18.3\/16″<\/td>24″<\/td>20<\/td>1.1\/8″<\/td>1.3\/8″<\/td><\/tr>\n
20″<\/td>29″<\/td>20.13\/16″<\/td>26.1\/2″<\/td>24<\/td>1.1\/8″<\/td>1.1\/2″<\/td><\/tr>\n
24″<\/td>33.1\/2″<\/td>24.1\/4″<\/td>30.3\/4″<\/td>24<\/td>1.1\/4″<\/td>1.5\/8″<\/td><\/tr>\n <\/tbody>\n <\/table>\n<\/div>\n\n

4-Inch Flange Dimensions<\/h2>\n

The 4-inch (DN 100) size is one of the most common nominal bores in industrial pipelines. Per the Class 150 table above, a 4-inch ASME B16.5 flange has an outside diameter of 228.6 mm and a thickness of 23.9 mm.<\/p>\n

Note: Class 300\u20132500 dimensions for the 4-inch size are not yet included on this page. Please contact our team via WhatsApp or email for the full pressure-class breakdown at this size, or for a size you don’t see listed above.<\/em><\/p>\n\n

Do you need a specific flange dimension not shown here, or a certified mill test report to match? Contact us<\/a> or email sales@neelamforgeindia.com<\/a> \u2014 we’re happy to confirm exact specs for your project.<\/p>\n","protected":false},"excerpt":{"rendered":"

SS Flange Standard Dimensions Chart in mm & PDF Check Flange Dimensions Chart in MM of Class 150, Flange Class 300, Flange Class 600, Class 900 [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-charts"],"_links":{"self":[{"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/posts\/259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/comments?post=259"}],"version-history":[{"count":21,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/posts\/259\/revisions"}],"predecessor-version":[{"id":436,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/posts\/259\/revisions\/436"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/media\/283"}],"wp:attachment":[{"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/media?parent=259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/categories?post=259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/neelamforgeindia.com\/others\/wp-json\/wp\/v2\/tags?post=259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}