Royal Steel

MSS-SP-43 Fittings The MSS-SP-43 standard provides guidelines for the dimensions, tolerances, materials, and markings of stainless steel butt-welding fittings. These fittings are commonly used in piping systems where the joining of stainless steel pipes is required. It's important to note that standards and specifications may be updated or revised over time, so it's advisable to check the latest edition of the MSS-SP-43 standard or any relevant updates from the Manufacturers Standardization Society for the most current information.

MSS-SP-43 Fittings

MSS-SP-43 Fittings Specifications

Specifications	MSS-SP-43 Fittings
Mss Sp-43 Stub End	Mss Sp-43 Type A Stub End Mss Sp-43 Type B Stub End
Schedule	SCH 10 To SCH 180.
Manufacturer Size	NPS 1⁄₂"/ 2"/ 4"/ 6"/ 8"
Method	Seamless Welded Butt-Weld Fabricated
Different Ends Finishing:	Beveled Ends Flanged Ends Squared Ends
Mss-sp-43 Stub End Use	Stub End Fittings can be described as mechanical joints.
Manufacturer Type A Stub End	Mss-sp-43 Short Stub End Mss-sp-43 Long Stub End
material	Incoloy, Alloy 20, Duplex Steel, Tantalum, Carbon Steel, Super Duplex, Hastalloy, Alloy Steel, Brass, Cupro-Nickel Inconel, Monel, Bronze, Stainless Steel, Nickel Alloys.

Types Of MSS Sp-43 Type A Stub End

Mss Sp-43 Type A Stub End

Mss Sp-43 Type B Stub End

Mss Sp-43 Type A Long Stub End

Mss Sp 43 Butt Welding Fittings

Mss Sp-43 Stub End

Mss-sp-43 Short Stub End

Mss-sp-43 Long Stub End

MSS Sp 43 Stub End Dimensions

MSS Sp-43 Type A Stub End Dimensions

Normal Pipe Size	Outer Diameter	(T)	(G)	(F)	(R) Type A	R Type B
1/2	21.3	2.11	34.9	50.8	3.05	0.76
3/4	26.7	2.11	42.9	50.8	3.05	0.76
1	33.4	2.77	50.8	50.8	3.05	0.76
1.1/4	42.2	2.77	63.5	50.8	4.83	0.76
1.1/2	48.3	2.77	73	50.8	6.35	0.76
2	60.3	2.77	92.1	63.5	7.87	0.76
2.1/2	73	3.05	104.8	63.5	7.87	0.76
3	88.9	3.05	127	63.5	9.65	0.76
3.1/2	101.6	3.05	139.7	76.2	9.65	0.76
4	114.3	3.05	157.2	76.2	11.18	0.76
5	141.3	3.40	185.7	76.2	11.18	1.52
6	168.3	3.40	215.9	88.9	12.7	1.52
8	219.1	3.76	269.9	101.6	12.7	1.52
10	273.1	4.19	323.9	127	12.7	1.52
12	323.9	4.57	381	152.4	12.7	1.52
14	355.6	4.78	412.8	152.4	12.70	1.52
16	406.4	4.78	469.9	152.4	12.7	1.52
18	457.2	4.78	533.4	152.4	12.70	1.52
20	508	5.54	584.2	152.4	12.70	1.52
24	609.6	6.35	692.2	152.4	12.7	1.52

MSS Sp-43 Type B Stub End Dimensions

Normal Pipe Size	Outside Diameter	(T)	(G)	(F)	(R)	Kilogram
1/2	21.3	2.11	34.9	50.8	3.18	0.07
3/4	26.7	2.11	42.9	50.8	3.18	0.10
1	33.4	2.77	50.8	50.8	3.18	0.16
1¼	42.2	2.77	63.5	50.8	4.76	0.22
1½	48.3	2.77	73	50.8	6.35	0.25
2	60.3	2.77	92.1	63.5	7.94	0.43
2½	73	3.05	104.8	63.5	7.94	0.57
3	88.9	3.05	127	63.5	9.53	0.73
4	114.3	3.05	157.2	76.2	11.11	1.09
5	141.3	3.40	185.7	76.2	11.11	1.47
6	168.3	3.40	215.9	88.9	12.70	2.15
8	219.1	3.76	269.9	101.6	12.70	3.22
10	273.1	4.19	323.9	127	12.70	5.13
12	323.9	4.57	381	152.4	12.70	8.16
14	355.6	4.78	412.8	152.4	12.70	10.89
16	406.4	4.78	469.9	152.4	12.70	12.70
18	457.2	4.78	533.4	152.4	12.70	17.24
20	508	5.54	584.2	152.4	12.70	21.77
24	609.6	6.35	692.2	152.4	12.70	27.22

MSS Sp 43 Stub End Weight Chart

Normal Pipe Size In inch	MSS Sp 43 STUB ENDS
Normal Pipe Size In inch	Schedule 5S	Schedule 10S	Schedule 40S	Schedule 80S
1/2	0.06	0.08	0.12	0.13
3/4	0.07	0.09	0.15	0.17
1	0.09	0.15	0.20	0.25
1 1/4	0.13	0.20	0.30	0.35
1 1/2	0.16	0.25	0.38	0.46
2	0.25	0.40	0.55	0.75
2 1/2	0.35	0.50	0.80	1.00
3	0.50	0.60	1.10	1.50
4	0.70	1.00	1.80	2.50
5	1.00	1.25	2.50	3.50
6	1.60	1.95	3.70	5.50
8	2.50	3.10	5.90	10.0
10	4.00	4.90	10.5	14.0
12	6.60	7.10	15.0	20.0
14	6.40	7.80	15.5	20.5
16	7.90	9.00	18.0	24.0
18	9.30	10.5	21.0	28.0
20	12.0	13.5	23.5	31.0
24	16.5	19.0	28.5	38.0

MSS-SP-43 Wrought Fittings Tolerances

NPS	1/2 up to 2.1/2	3 to 3.1/2	4	5 to 8	10 to 18	20 to 24
O.D. at Welding End (Outside Diameter)	+ 1.6 - 0.8	1.6	1.6	+ 2.29 - 1.6	+ 4.06 - 3.05	+ 6.35 - 4.83
Overall Length Of ((F))	1.6	1.6	1.6	1.6	2	2
O.D. of Lap ((G))	+ 0 - 0.76	+ 0 - 0.76	+ 0 - 0.76	+ 0 - 0.76	+ 0 - 1.6	+ 0 - 1.6
Wall Thickness of Lap ((T))	+ 1.52 - 0	+ 1.52 - 0	+ 1.52 - 0	+ 1.52 - 0	+ 1.52 - 0	+ 1.52 - 0
Lap Fillet Radius of ((R))	+ 0 - 0.76	+ 0 - 0.76	+ 0 - 1.6	+ 0 - 1.6	+ 0 - 1.6	+ 0 - 1.6

Mss-SP-43 Fabricated Fittings Size Chart

Outside Daimeter (O.D.) & Inside Daimeter (I.D.)	List Of Equivalent	(NPS)	Size Of Threads In Inch
5/16	0.313	1/16	27
13/32	0.405	1/8	27
35/64	0.540	1/4	18
43/64	0.675	3/8	18
27/32	0.840	1/2	14
1-3/64	1.050	3/4	14
1-5/16	1.315	1	11-1/2
1-21/32	1.660	1-1/4	11-1/2
1-29/32	1.900	1-1/2	11-1/2
2-3/8	2.375	2	11-1/2
2-7/8	2.875	2-1/2	8
3-1/2	3.500	3	8
4	4.000	3-1/2	8
4-1/2	4.500	4	8

MSS SP-43 Wrought And Fabricated Butt-Welding Fittings Pressure Rating

MSS SP-43 Stub Ends Pressure Ratings
MSS SP-43 Type A Stub End Temperature Ratings		Types Of Pressure Ratings Class
		Class 150#	Class 300#
			1/4 - 1 (Inch)	1 1/4 - 2 (Inch)	2 1/2 - 3 (Inch)
(^oF)	(^oC)		1/4 - 1 (Inch)	1 1/4 - 2 (Inch)	2 1/2 - 3 (Inch)
-20 to 150	-29 to 66	300	2000	1500	1000
200	93	265	1785	1350	910
250	121	225	1575	1200	825
300	149	185	1360	1050	735
350	177	150	1150	900	650
400	204	-	935	750	560
450	232	-	725	600	475
500	260	-	510	450	385
550	288	-	300	300	300

Different Ends Finishing Of MSS SP 43 Stub End

Grooved Ends
Threaded Ends (Male Only)
Flanged Ends
Squared Ends
Beveled Ends

MSS-SP-43 Fittings Thickness

Normal Size Of Pipe (DN)	Schedule Number	Outer Daimeter In inch millmeter	Wall Thickness inch millmeter	Mass lb/ft kg/m
1/8 6	5S	0.405 10.3	...	...
1/8 6	10S	0.405 10.3	0.049 1.24	0.19 0.28
1/8 6	40S	0.405 10.3	0.068 1.73	0.24 0.37
1/8 6	80S	0.405 10.3	0.095 2.41	0.31 0.47
1/4 8	5S	0.540 13.7	...	...
1/4 8	10S	0.540 13.7	0.065 1.65	0.33 0.49
1/4 8	40S	0.540 13.7	0.088 2.24	0.43 0.63
1/4 8	80S	0.540 13.7	0.119 3.02	0.54 0.80
3/8 10	5S	0.675 17.1	...	...
3/8 10	10S	0.675 17.1	0.065 1.65	0.42 0.63
3/8 10	40S	0.675 17.1	0.091 2.31	0.57 0.84
3/8 10	80S	0.675 17.1	0.126 3.20	0.74 1.10
1/2 15	5S	0.840 21.3	0.065 1.65	0.54 0.80
1/2 15	10S	0.840 21.3	0.083 2.11	0.67 1.00
1/2 15	40S	0.840 21.3	0.109 2.77	0.85 1.27
1/2 15	80S	0.840 21.3	0.147 3.73	1.09 1.62
3/4 20	5S	1.050 26.7	0.065 1.65	0.68 1.02
3/4 20	10S	1.050 26.7	0.083 2.11	0.86 1.28
3/4 20	40S	1.050 26.7	0.113 2.87	1.13 1.69
3/4 20	80S	1.050 26.7	0.154 3.91	1.48 2.20
1 25	5S	1.315 33.4	0.065 1.65	0.68 1.02
1 25	10S	1.315 33.4	0.083 2.11	0.86 1.28
1 25	40S	1.315 33.4	0.133 3.38	1.68 2.50
1 25	80S	1.315 33.4	0.179 4.55	2.17 3.24
1-1/4 32	5S	1.660 42.2	0.065 1.65	1.11 1.65
1-1/4 32	10S	1.660 42.2	0.109 2.77	1.81 2.69
1-1/4 32	40S	1.660 42.2	0.140 3.56	2.27 3.39
1-1/4 32	80S	1.660 42.2	0.191 4.85	3.00 4.47
1-1/2 40	5S	1.900 48.3	0.065 1.65	1.28 1.90
1-1/2 40	10S	1.900 48.3	0.109 2.77	2.09 3.11
1-1/2 40	40S	1.900 48.3	0.145 3.68	2.72 4.05
1-1/2 40	80S	1.900 48.3	0.200 5.08	3.63 5.41
2 50	5S	2.375 60.3	0.065 1.65	1.61 2.39
2 50	10S	2.375 60.3	0.109 2.77	2.64 3.93
2 50	40S	2.375 60.3	0.154 3.91	3.66 5.44
2 50	80S	2.375 60.3	0.218 5.54	5.03 7.48
2-1/2 65	5S	2.875 73	0.083 2.11	2.48 3.69
2-1/2 65	10S	2.875 73	0.120 3.05	3.53 5.26
2-1/2 65	40S	2.875 73	0.203 5.16	5.80 8.63
2-1/2 65	80S	2.875 73	0.276 7.01	7.67 11.41
3 80	5S	3.500 88.9	0.083 2.11	3.03 4.52
3 80	10S	3.500 88.9	0.120 3.05	4.34 6.46
3 80	40S	3.500 88.9	0.216 5.49	7.58 11.29
3 80	80S	3.500 88.9	0.300 7.62	10.26 15.27
3-1/2 90	5S	4.000 101.6	0.083 2.11	3.48 5.18
3-1/2 90	10S	4.000 101.6	0.120 3.05	4.98 7.41
3-1/2 90	40S	4.000 101.6	0.226 5.74	9.12 13.57
3-1/2 90	80S	4.000 101.6	0.318 8.08	12.52 18.64
4 100	5S	4.500 114.3	0.083 2.11	3.92 5.84
4 100	10S	4.500 114.3	0.120 3.05	5.62 8.37
4 100	40S	4.500 114.3	0.237 6.02	10.80 16.08
4 100	80S	4.500 114.3	0.337 8.56	15.00 22.32
5 125	5S	5.563 141.3	0.109 2.77	6.36 9.46
5 125	10S	5.563 141.3	0.134 3.40	7.78 11.56
5 125	40S	5.563 141.3	0.258 6.55	14.63 21.77
5 125	80S	5.563 141.3	0.375 9.53	20.80 30.97
6 150	5S	6.625 168.3	0.109 2.77	7.59 11.31
6 150	10S	6.625 168.3	0.134 3.40	9.30 13.83
6 150	40S	6.625 168.3	0.280 7.11	18.99 28.26
6 150	80S	6.625 168.3	0.432 10.97	28.60 42.56

Application Of MSS SP 43 Buttwelding Fittings

Specialty Chemicals
Power Generation
Condensers
Chemical Equipment
Gas Processing
Pulp and Paper Industry

Sea Water Equipment
Pharmaceutical Equipment
Off-Shore Oil Drilling Companies
Petrochemicals
Heat Exchangers
Pharmaceuticals

MSS SP-43 Type B Stub End – End Welding Bevels

Normal Size Of Pipe In Inches	NB	Outside Daimeter	Wall Thickness	schedule 10	schedule 20	schedule 30	schedule 40	schedule 80
1/2	15 NB	21.30	1.65	2.11	__	2.41	2.77	3.73
3/4	20 NB	26.70	1.65	2.11	__	2.41	2.87	3.91
1	25 NB	33.40	1.65	2.77	__	2.90	3.38	4.55
1 1/4	32 NB	42.20	1.65	2.77	__	2.97	3.56	4.85
1 1/2	40 NB	48.30	1.65	2.77	__	3.18	3.68	5.08
2	50 NB	60.30	1.65	2.77	__	3.18	3.91	5.54
2 1/2	65 NB	73.00	2.11	3.05	__	4.78	5.16	7.01
3	80 NB	88.90	2.11	3.05	__	4.78	5.49	7.62
3 1/2	90 NB	101.60	2.11	3.05	__	4.78	5.74	8.08
4	100 NB	114.30	2.11	3.05	__	4.78	6.02	8.56
5	125 NB	141.30	2.77	3.40	__	__	6.55	9.53
6	150 NB	168.30	2.77	3.40	__	__	7.11	10.97
8	200 NB	219.10	2.77	3.76	6.35	7.04	8.18	12.70
10	250 NB	273.00	3.40	4.19	6.35	7.80	9.27	15.09
12	300 NB	323.80	3.96	4.57	6.35	8.38	10.31	17.48
14	350 NB	355.60	3.96	6.35	7.92	9.53	11.13	19.05
16	400 NB	406.40	4.19	6.35	7.92	9.53	12.7	21.44
18	450 NB	457.00	4.19	6.35	7.92	11.13	14.27	23.83
20	500 NB	508.00	4.78	6.35	9.53	12.70	15.09	26.19
22	550 NB	559.00	4.78	6.35	9.53	12.70	__	28.58
24	600 NB	610.00	5.54	6.35	9.53	14.27	17.48	30.96

MSS SP-43 Standard

MSS SP-43 provides requirements for fabricated and wrought butt-welding fittings intended for low pressure, corrosion resistant applications. Requirements covered include size, marking, metal thickness, dimensions, pressure ratings, materials, testing, and tolerances

MSS SP-43 Type B Stub End Length

(Normal Size Of Pipe)	Type Of Schedule	(D)	(T)	(G)	(F)	R. Maximum	Kilogram And St.
1/2 “	10s	21.3	2.11	34.9	50.8	3.18	0.07	s
	40s		2.77				0.09	s
3/4 “	10s	26.7	2.11	42.9	50.8	3.18	0.10	s
	40s		2.87				0.12	s
1 “	10s	33.4	2.77	50.8	50.8	3.18	0.16	s / w
	40s		3.38				0.17	s
1 1/4 “	10s	42.2	2.77	63.5	50.8	4.76	0.22	s
	40s		3.56				0.25	s
1 1/2 “	10s	48.3	2.77	73.0	50.8	6.35	0.25	s / w
	40s		3.68				0.31	s
2 “	10s	60.3	2.77	92.1	63.5	7.94	0.43	s / w
	40s		3.91				0.61	s
2 1/2 “	10s	73.0	3.05	104.8	63.5	7.94	0.57	s / w
	40s		5.16				0.80	s
3 “	10s	88.9	3.05	127.0	63.5	9.53	0.73	s / w
	40s		5.49				1.13	s
4 “	10s	114.3	3.05	157.2	76.2	11.11	1.09	s / w
	40s		6.02				1.87	s
5 “	10s	141.3	3.40	185.7	76.2	11.11	1.47	s / w
	40s		6.55				2.28	s
6 “	10s	168.3	3.40	215.9	88.9	12.70	2.15	s / w
	40s		7.11				3.57	s / w
8 “	10s	219.1	3.76	269.9	101.6	12.70	3.22	s / w
	40s		8.18				6.07	s / w
10 “	10s	273.1	4.19	323.9	127.0	12.70	5.13	w
	40s		9.27				10.07	w
12 “	10s	323.9	4.57	381.0	152.4	12.70	8.16	w

MSS-SP-43 Fittings

MSS-SP-43 Fittings

MSS-SP-43 Fittings Specifications

Types Of MSS Sp-43 Type A Stub End

Mss Sp-43 Type A Stub End

Mss Sp-43 Type B Stub End

Mss Sp-43 Type A Long Stub End

Mss Sp 43 Butt Welding Fittings

Mss Sp-43 Stub End

Mss-sp-43 Short Stub End

Mss-sp-43 Long Stub End

MSS Sp 43 Stub End Dimensions

MSS Sp-43 Type A Stub End Dimensions

MSS Sp-43 Type B Stub End Dimensions

MSS Sp 43 Stub End Weight Chart

MSS-SP-43 Wrought Fittings Tolerances

Mss-SP-43 Fabricated Fittings Size Chart

MSS SP-43 Wrought And Fabricated Butt-Welding Fittings Pressure Rating

Different Ends Finishing Of MSS SP 43 Stub End

MSS-SP-43 Fittings Thickness

Application Of MSS SP 43 Buttwelding Fittings

MSS SP-43 Type B Stub End – End Welding Bevels

MSS SP-43 Standard

MSS SP-43 Type B Stub End Length

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