The Manufacturers Standardization Society, or MSS, of the Valve and Fittings Inc. created and released the American National Standard. The MSS SP 44 Class 150 Expander Flange Standard Practice addresses things like pressure-temperature ratings, materials, dimensions, tolerances, markings, etc. The standard for Asme B16.47 Series A and Series B (Mss Sp-44) Flanges also addresses testing for steel pipeline flanges in addition to these parameters.
The specification specifies that the welding Carbon Steel MSS SP 44 Class 150 Flanges must be made of forged steel. The blind Mss Sp 44 Steel Pipeline Flanges, however, could be produced from steel plate or from forged steel. For steel pipeline flanges, the ANSI/MSS SP-44-2016 (Reissue 2017) standard practise covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing. According to the paper, forged steel must be used to make welding neck type flanges, while steel plate or forged steel may be used to make blind flanges.
The Mss Sp 44 Standard was updated in 2016. Major updates to the ANSI/MSS SP-44-2016 standard were made, including the definition of chemistry limits for Mss Sp 44 Flanges Weight, clarification of the "lot" definition of Mss Sp 44 Class 150 Flanges, changes to the marking requirements, the addition of a requirement for hardness testing, the requirement to conduct impact testing at -50 °F for grades with Mss Sp 44 Flange Dimensions greater than F42, and clarification of allowable heat treatment techniques. Aside from these changes, tolerances for higher face height and bolt hole diameter were also added.
The updated and renumbered reference annex, the removed ring gasket dimensions in reference with ASME B16.20A, and the addition of Supplementary Requirements from SR1 through SR16 are among the new requirements for Manufacturing Procedure Specification, Inspection, and Test Plans for the MSS SP-44 Flange.
The Bitumen upgraders, heavy oil refineries, nuclear power, where the application is largely seamless, as well as the Petrochemicals and acid industries, are key markets that use the Mss Sp-44 Material in their equipment or machinery. The MSS SP 44 Class 150 Square Flanges are produced using a forging, heat-treating, and machining process.
The most prevalent MSS SP 44 product types found on the market are forged, threaded, screwed, and plate. The Mss Sp 44 Standard flanges are often coated for surface treatment. These flanges can be painted with oil black paint or anti-rust paint. Galvanization or plating are two other significant surface treatment methods used by Indian manufacturers of Mss-Sp-44 Weld Neck Flange. Thus, depending on the needs of the buyers, these flanges are offered in zinc plating, yellow transparency, cold and hot dip galvanizing, or zinc plating.
While the MSS SP 44 Flange Pressure Rating ANSI ranges from Class 150 LBS to roughly 2500 LBS, the size chart for Class 150 Stainless Steel MSS SP 44 Flanges ranges from 12 inch (15 NB) to 48 inches (1200NB) DN10DN5000.

| Specifications | MSS SP 44 Flanges |
|---|---|
| MSS SP Flanges Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flanges. |
| ASME B16.5 MSS SP Flanges size range | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
| MSS SP Flanges Standard DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 |
| MSS SP Flanges Standard ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| MSS SP Flanges Standard UNI | 6Bar 10Bar 16Bar 25Bar 40Bar |
| MSS SP Flanges Standard EN | 6Bar 10Bar 16Bar 25Bar 40Bar |
| MSS SP Flanges Standard JIS | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K |
| Main Types | Forged / Threaded / Screwed / Plate |
| Flange supporting material | Gasket, Ring Joint, Flange Bolts |
| Most common types of MSS SP Flanges |
|
| Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, , Groove |
| MSS SP Pipe Flanges Test Certificates | EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
| Production technique |
|
| Special design | As per your drawing AS, ANSI, BS, DIN and JIS JIS Threaded Flange, Socketweld Flange, Slip-On Flange, Blind Flange, Weld Neck Flange |
| Specialized manufacturer of |
|
| Test | Hydrostatic testing machine, Direct-reading Spectrograph,UI trasonic flaw detector, X-ray detector, Magnetic particle detector |
| Equipment | Bending machine, Press machine, electric bevelling machine, Pushing Machine, Sand-blasting machine etc |
| Origin | West Europe /Indian / USA / Japan / Korean |
| MSS SP 44 Flanges Standard | ANSI DIN, GOST, MSS SP, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
|
| Key markets and industries for MSS SP Flanges |
|
| Export to | Indonesia, Ireland, Ukraine, Singapore,Saudi Arabia,Canada, Peru, Dubai, Brazil, Iran, Korea, USA, India, Egypt, Thailand, Spain, Oman etc |
| MSS SP 44 Flanges Application |
|
| Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175 | |
15mm (1/2") MSS SP Flanges Weight Chart
Standard |
Class |
Diameter |
Bolt Circle Diameter |
Number of Bolts |
Bolt Size |
Diameter of Bolt Hole |
|---|---|---|---|---|---|---|
AS4087 Flanges |
PN14 Flanges |
95 |
67 |
4 |
M12 |
14 |
AS 2129 Flange |
Table C Flanges |
95 |
67 |
4 |
13 |
14 |
Table D Flanges |
95 |
67 |
4 |
13 |
14 |
|
Table E Flanges |
95 |
67 |
4 |
13 |
14 |
|
Table F Flanges |
95 |
67 |
4 |
13 |
14 |
|
Table H Flanges |
114 |
83 |
4 |
16 |
17 |
|
Table J Flanges |
114 |
83 |
4 |
16 |
17 |
|
ANSI B16.5 Flanges |
ANSI 150 Flanges |
89 |
60 |
4 |
13 |
16 |
ANSI 300 Flanges |
95 |
67 |
4 |
13 |
16 |
|
ANSI 600 Flanges |
95 |
67 |
4 |
13 |
16 |
|
ANSI 900 Flanges |
121 |
83 |
4 |
19 |
22 |
|
ANSI 1500 Flanges |
121 |
83 |
4 |
19 |
22 |
|
ISO 7005 (DIN) Flange |
PN6 Flanges |
80 |
55 |
4 |
M10 |
11 |
PN10 Flanges |
95 |
65 |
4 |
M12 |
14 |
|
PN16 Flanges |
95 |
65 |
4 |
M12 |
14 |
|
PN20 Flanges |
90 |
60.5 |
4 |
M14 |
16 |
|
PN25 Flanges |
95 |
65 |
4 |
M12 |
14 |
|
PN40 Flanges |
95 |
65 |
4 |
M12 |
14 |
MSS SP-44 Flange |
|
MSS SP MSS SP-44 Ring Type Joint Flange |
MSS SP MSS SP-44 Square Flange |
MSS SP MSS SP-44 Weld Neck Flange |
MSS SP MSS SP-44 Socket Weld Flange |
MSS SP MSS SP-44 Blind Flange |
MSS SP MSS SP-44 Reducing Flange |
MSS SP MSS SP-44 Slip-On Flange |
MSS SP MSS SP-44 Threaded Flange |
MSS SP MSS SP-44 Orifice Flange |
MSS SP MSS SP-44 Forged Flange |
MSS SP MSS SP-44 Lap Joint Flange |
MSS SP MSS SP-44 Plate Flange |
MSS SP-44 Flange Dimensions
150 LB. MSS SP-44 FLANGES |
|||||||||
SIZE |
O.D. |
T |
T1 |
øK |
øX |
P.C.D. |
N |
ød |
LN |
12 |
19 |
1 1/4 |
1 1/4 |
15 |
14 3/8 |
17 |
12 |
1 |
4 1/2 |
14 |
21 |
1 3/8 |
1 3/8 |
16 1/4 |
15 3/4 |
18 3/4 |
12 |
1 1/8 |
5 |
16 |
23 1/2 |
1 7/16 |
1 7/16 |
18 1/2 |
18 |
21 1/4 |
16 |
1 1/8 |
5 |
18 |
25 |
1 9/16 |
1 9/16 |
21 |
19 7/8 |
22 3/4 |
16 |
1 1/4 |
5 1/2 |
20 |
27 1/2 |
1 11/16 |
1 11/16 |
23 |
22 |
25 |
20 |
1 1/4 |
5 11/16 |
22 |
29 1/2 |
1 13/16 |
1 13/16 |
25 1/4 |
24 |
27 1/4 |
20 |
1 3/8 |
5 7/8 |
24 |
32 |
1 7/8 |
1 7/8 |
27 1/4 |
26 1/8 |
29 1/2 |
20 |
1 3/8 |
6 |
26 |
34 1/4 |
2 11/16 |
2 11/16 |
29 1/2 |
26 5/8 |
31 3/4 |
24 |
1 3/8 |
4 3/4 |
28 |
36 1/2 |
2 13/16 |
2 13/16 |
31 1/2 |
28 5/8 |
34 |
28 |
1 3/8 |
4 15/16 |
30 |
38 3/4 |
2 15/16 |
2 15/16 |
33 3/4 |
30 3/4 |
36 |
28 |
1 3/8 |
5 3/8 |
32 |
41 3/4 |
3 3/16 |
3 3/16 |
36 |
32 3/4 |
38 1/2 |
28 |
1 5/8 |
5 11/16 |
34 |
43 3/4 |
3 1/4 |
3 1/4 |
38 |
34 3/4 |
40 1/2 |
32 |
1 5/8 |
5 7/8 |
36 |
46 |
3 9/16 |
3 9/16 |
40 1/4 |
36 3/4 |
42 3/4 |
32 |
1 5/8 |
6 3/16 |
40 |
50 3/4 |
2 3/8 |
3 1/2 |
40 3/4 |
43 3/4 |
47 1/4 |
36 |
1 5/8 |
6 3/4 |
42 |
53 |
2 5/8 |
3 3/4 |
47 |
44 3/4 |
49 1/2 |
36 |
1 5/8 |
6 15/16 |
48 |
59 1/2 |
2 3/4 |
4 1/8 |
53 1/2 |
50 3/4 |
56 |
44 |
1 5/8 |
7 1/4 |
MSS SP 44 Flanges Flange Standards / Types and Pressure Class :
| ASME/ANSI B 16.36 | Welding Neck Flange, Slip on Flange, Threaded Flange |
| PRESSURE CLASS | 300, 400, 600, 900, 1500, 2500 |
| ASME/ANSI B 16.5 | Welding Neck Flange, Slip on Flange, Blind Flange, High Hub Blind Flange, Socket Weld Flange, Lap Joint Flange, Threaded Flange, Ring Type Joint Flange |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| ASME/ANSI B 16.47 | Welding Neck Flange, Blind Flange [Series A & B] |
| PRESSURE CLASS | 75, 150, 300, 400, 600, 900 |
| BS 4504 SEC 3.1 | Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange |
| PRESSURE CLASS | PN 2.5 TO PN 40 |
| BS 4504[PART 1] | Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange |
| PRESSURE CLASS | PN 2.5 TO PN 400 |
| BS 1560 BOSS | Welding Neck Flange, Socket Welding Flange, Slip-On Flange, Blind Flange, Screwed Boss Flange, Lapped Flange |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| BS10 | Welding Neck Flange, Plate Slip-On Flange, Screwed Boss Flange, Slip-On Boss Flange, Blind Flange |
| TABLE | D, E, F, H |
| DIN FLANGES | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 |
| PRESSURE CLASS | PN 6 TO PN 100 |
Pipe Normal Diam. |
O.D. OF Flange |
Thickness |
Length Through Hub |
Diam. of Hub at Base |
Hub Diam. Top |
Raised Face Diam. |
Diam. of Bolt Circle |
No. of Bolt Holes |
Diam. of Bolt Holes |
Diam. of Bolt |
Fillet Radius Min. |
inch |
O |
C |
Y |
X |
A |
R |
BD |
BN |
BH |
DB |
r1 |
26″ |
870 |
68.3 |
120.7 |
676.1 |
660.4 |
749.3 |
806.5 |
24 |
35.1 |
1 1/4 |
9.7 |
28″ |
927.1 |
71.4 |
125.5 |
726.9 |
711.2 |
800.1 |
863.6 |
28 |
35.1 |
1 1/4 |
11.2 |
30″ |
984.3 |
74.7 |
136.7 |
781.1 |
762 |
857.3 |
914.4 |
28 |
35.1 |
1 1/4 |
11.2 |
32″ |
1060.5 |
81 |
144.5 |
831.9 |
812.8 |
914.4 |
977.9 |
28 |
41.1 |
1 1/2 |
11.2 |
34″ |
1111.3 |
82.6 |
149.4 |
882.7 |
863.6 |
965.2 |
1028.7 |
32 |
41.1 |
1 1/2 |
12.7 |
36″ |
1168.4 |
90.4 |
157.2 |
933.5 |
914.4 |
1022.4 |
1085.9 |
32 |
41.1 |
1 1/2 |
12.7 |
38″ |
1238.3 |
87.4 |
157.2 |
990.6 |
965.2 |
1073.2 |
1149.4 |
32 |
41.1 |
1 1/2 |
12.7 |
40″ |
1289.1 |
90.4 |
163.6 |
1041.4 |
1016 |
1124 |
1200.2 |
36 |
41.1 |
1 1/2 |
12.7 |
42″ |
1346.2 |
96.8 |
171.5 |
1092.2 |
1066.8 |
1193.8 |
1257.3 |
36 |
41.1 |
1 1/2 |
12.7 |
44″ |
1403.4 |
101.6 |
177.8 |
1143 |
1117.6 |
1244.6 |
1314.5 |
40 |
41.1 |
1 1/2 |
12.7 |
46″ |
1454.2 |
103.1 |
185.7 |
1196.8 |
1168.4 |
1295.4 |
1365.3 |
40 |
41.1 |
1 1/2 |
12.7 |
48″ |
1511.3 |
108 |
192 |
1247.6 |
1219.2 |
1358.9 |
1422.4 |
44 |
41.1 |
1 1/2 |
12.7 |
50″ |
1568.5 |
111.3 |
203.2 |
1301.8 |
1270 |
1409.7 |
1479.6 |
44 |
47.8 |
1 3/4 |
12.7 |
52″ |
1625.6 |
115.8 |
209.6 |
1352.6 |
1320.8 |
1460.5 |
1536.7 |
44 |
47.8 |
1 3/4 |
12.7 |
54″ |
1682.8 |
120.7 |
215.9 |
1403.4 |
1371.6 |
1511.3 |
1593.9 |
44 |
47.8 |
1 3/4 |
12.7 |
56″ |
1746.3 |
124 |
228.6 |
1457.5 |
1422.4 |
1574.8 |
1651 |
48 |
47.8 |
1 3/4 |
12.7 |
58″ |
1803.4 |
128.5 |
235 |
1508.3 |
1473.2 |
1625.6 |
1708.2 |
48 |
47.8 |
1 3/4 |
12.7 |
60″ |
1854.2 |
131.8 |
239.8 |
1559.1 |
1524 |
1676.4 |
1759 |
52 |
47.8 |
1 3/4 |
12.7 |
Flange Schedule/Class |
Pipe Size - Pipe Flanges |
Flange Connection Type |
Flange Material |
Max. Pressure |
|---|---|---|---|---|
ASME B16.5 Class 150 |
1/2" |
FNPT |
MSS SP |
150 psi |
ASME B16.5 Class 150 |
1/2" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
1/2" |
Welded |
MSS SP |
150 psi |
ASME B16.5 Class 150 |
3/4" |
FNPT |
MSS SP |
150 psi |
ASME B16.5 Class 150 |
3/4" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
1-1/4" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
1-1/2" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
2" |
FNPT |
MSS SP |
150 psi |
ASME B16.5 Class 150 |
2" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
2-1/2" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
3" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 150 |
4" |
FNPT |
MSS SP |
150 psi |
ASME B16.5 Class 150 |
4" |
Socket Weld |
Forged MSS SP |
275 psi |
ASME B16.5 Class 300 |
1/2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1/2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1-1/4" |
FNPT |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1-1/4" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1-1/2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
1-1/2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
2-1/2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
2-1/2" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
3" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
3" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
4" |
Slip On |
Forged MSS SP |
720 psi |
ASME B16.5 Class 300 |
4" |
Slip On |
Forged MSS SP |
720 psi |
MSS SP 44 Vacuum Flanges |
MSS SP 44 Reducing Flange |
MSS SP 44 Turbo Flanges |
MSS SP 44 Forged Flanges |
MSS SP 44 Threaded Reducing Flanges |
MSS SP 44 Reducing Flanges |
MSS SP 44 Reducing Flanges |
44 MSS SP Forged Flange |
MSS SP 44 Slip-On Pipe Flanges |
44 MSS SP Blind Flange |
MSS SP 44 Square Flanges |
MSS SP 44 Ansi Flanges |
MSS SP 44 Floor Flanges |
MSS SP 44 Threaded Flanges |
Ansi 150 MSS SP 44 Flanges |
MSS SP 44 JIS BLRF Flanges |
MSS SP 44 Split Flanges |
44 MSS SP Reducing Flange |
MSS SP 44 Blank Flanges |
MSS SP 44 Orifice Flanges |
MSS SP 44 Bsp Flanges |
MSS SP-44 Orifice Flanges |
MSS SP 44 Split Flanges |
MSS SP-44 Blind Flanges |
MSS SP 44 Companion Flanges |
44 MSS SP Orifice Flanges |
MSS SP 44 Class 150 Flanges |
MSS SP 44 Duct Flanges |
MSS SP 44 Wnrf Flanges |
MSS SP-44 Reducing Flanges |
Custom MSS SP 44 Flanges |
MSS SP 44 Socket weld Flanges |
Class 600 MSS SP 44 Flanges |
MSS SP-44 Socket weld Flanges |
MSS SP 44 Din Flanges |
44 MSS SP Socket weld Flanges |
Large Diameter MSS SP 44 Flanges |
MSS SP 44 SWRF Flanges |
Table E MSS SP 44 Flanges |
ASME B16.5 44 MSS SP Socket weld Flanges |
MSS SP 44 Cover Flanges |
MSS SP 44 Orifice Flanges |
MSS SP 44 Forged Flanges |
MSS SP-44 Threaded Flanges |
Gaskets For MSS SP 44 Flanges |
44 MSS SP Threaded Flanges |
High Pressure MSS SP 44 Flanges |
MSS SP 44 Threaded Flanges |
MSS SP-44 Lap Joint Flange |
MSS SP 44 Threaded Flanges |
MSS SP 44 Long Weld Neck Flanges |
MSS SP 44 Long weld Neck Flanges |
MSS SP 44 Handrail Flanges |
MSS SP 44 fastenersonline Flanges |
MSS SP 44 Exhaust Flanges |
MSS SP-44 Slip On Plate Flanges |
MSS SP 44 Header Flanges |
44 MSS SP Slip On Flanges |
MSS SP 44 Tube Flanges |
MSS SP-44 Header Flanges |
MSS SP 44 Metric Flanges |
MSS SP-44 Long weld Neck Flanges |
MSS SP 44 Muffler Flanges |
44 MSS SP Long weld Neck Flanges |
MSS SP 44 Pump Flanges |
MSS SP 44 Orifice Flanges |
MSS SP 44 Pressed Flanges |
MSS SP 44 Ring Type Joint Flanges |
MSS SP 44 Pad Flanges |
44 MSS SP RTJ Flanges |
MSS SP 44 Pipe Flanges |
MSS SP 44 Raised Face Slip On Flanges |
MSS SP 44 Reducing Flanges |
JIS RTJ Flanges |
MSS SP 44 Raised Face Flanges |
MSS SP 44 RTJ Flanges |
MSS SP 44 Ring Flanges |
BS4504 MSS SP 44 RTJ Flanges |
MSS SP 44 Stub End Flanges |
MSS SP 44 Raised Face Weld Neck Flanges |
MSS SP 44 Shower Rod Flanges |
MSS SP 44 Sae Flanges |
MSS SP 44 Backing Flanges |
MSS SP 44 Exhaust Flanges |
MSS SP 44 Screwed Flanges |
MSS SP 44 Clad Flanges |
MSS SP 44 Socket Weld Flanges |
MSS SP 44 JIS WNRF Flange |
MSS SP 44 Sbc Header Flanges |
MSS SP 44 Raised Face Blind Flanges |
MSS SP 44 Plate Flanges |
MSS SP 44 Pipe Flanges |
MSS SP 44 Slip On Flanges |
44 MSS SP Weld Neck Flange |
MSS SP 44 Puddle Flanges |
MSS SP-44 Ring Type Joint Flange |
