Stub End

Size: 1/2"-48"
Wall thickness: SCH5S-SCHXXS
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, MSS SP 43

PRODUCT DETAIL
Material

Size: 1/2″ to 48″ / DN15 to DN600
Wall thickness: SCH5S-SCHXXS
Type: Type A, Type B, Type C
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, MSS SP 43
Length: Long Pattern and Short Pattern

Acero has 3 warehouses in Wenzhou, Wuxi and Hebei. As one of the piping solution providers, Acero has been committed to providing one-stop solutions for projects in the fields of oil and gas, water, renewable energy and infrastructure. With years’ consistent dedication and innovation, our reliable, cost-effective and environment-friendly solutions have won clients’ wide recognition.
China Stub End manufacturer Acero supplies Stub Ends, Lap Joint Stub Ends in carbon steel, Stainless Steel, alloy steel, etc.

Lap Joint Stub End

Stub end is directly contact with pipes and medium whereas the flanges doesn’t. Therefore, the material grades of stub ends should satisfy the design and service conditions, while flanges can be made of lower grades to save the total cost.

STUB END TYPES

Stub ends are available in three different types, named “Type A”, “Type B” and “Type C”:

The first type (A) is manufactured and machined to match standard lap joint backing flange (the two products have to be used in combination). The mating surfaces have an identical profile to permit a smooth loading of the flare face
Stub ends type B are have to be used with standard slip-on flanges
Type C stub ends can be used either with lap joint or slip-on flanges and are manufactured from pipes

SHORT/LONG PATTERN STUB ENDS (ASA/MSS)

Stub ends are available in two different patterns:

the short pattern, called MSS-A stub ends
the long pattern, called ASA-A stub ends (or ANSI length stub end)

Short pattern (MSS) and long pattern stub ends (ASA)

STUB END FINISH

Stub ends can be ordered with different ends finishing:

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

Lap Joint Stub End Metric Dimensions as per ASME B16.9

NPS	ODMax	ODMin	LPF	SPF	R	G
1/2	22.8	20.5	76	51	3	35
3/4	28.1	25.9	76	51	3	43
1	35.0	32.6	102	51	3	51
1-1/4	43.6	41.4	102	51	5	64
11/2	49.9	47.5	102	51	6	73
2	62.4	59.5	152	64	8	92
2-1/2	75.3	72.2	152	64	8	105
3	91.3	88.1	152	64	10	127
3-1/2	104.0	100.8	152	76	10	140
4	116.7	113.5	152	76	11	157
5	144.3	140.5	203	76	11	186
6	171.3	167.5	203	89	13	216
8	222.1	218.3	203	102	13	270
10	277.2	272.3	254	127	13	324
12	328.0	323.1	254	152	13	381
NPS	ODMax	ODMin	LPF	SPF	R	G
14	359.9	354.8	305	152	13	413
16	411.0	405.6	305	152	13	470
18	462.0	456.0	305	152	13	533
20	514.0	507.0	305	152	13	584
22	565.0	558.0	305	152	13	641
24	616.0	609.0	305	152	13	692

GENERAL NOTES:

(a) All dimensions are in millimeters.
(b) See Table 13 for tolerances.
(c) Service conditions and joint construction often dictate stub end length requirements. Therefore, the purchaser must specify long or
short pattern fitting when ordering.

NOTES:

(1) Gasket face finish shall be in accordance with ASME B16.5 for raised face flanges.
(2) The lap thickness T shall not be less than nominal pipe wall thickness. See Table 13 for maximum tolerance.
(3) When short pattern stub ends are used with larger flanges in Classes 300 and 600, with most sizes in Classes 900 and higher, and
when long pattern stub ends are used with larger flanges in Classes 1500 and 2500, it may be necessary to increase the length of the
stub ends in order to avoid covering the weld with the flange. Such increases in length shall be a matter of agreement between the
manufacturer and purchaser.
(4) When special facings such as tongue and groove, male and female, etc., are employed, additional lap thickness must be provided and
such additional thickness shall be in addition to (not included in) the basic length F.
(5) These dimensions conform to the radius established for lap joint flanges in ASME B16.5.
(6) This dimension conforms to standard machined facings shown in ASME B16.5. The back face of the lap shall be machined to conform
to the surface on which it seats. Where ring joint facings are to be applied, use dimension K as given in ASME B16.5.

Pipe Fittings Dimensions Tolerance as per ASME B16.9

NOMINAL PIPE SIZE	ALL FITTINGS	ALL FITTINGS	ALL FITTINGS	ELBOWS AND TEES	180 DEG RETURN BENDS	180 DEG RETURN BENDS	180 DEG RETURN BENDS	REDUCERS	CAPS
NPS	O.D. at Bevel (1), (2)	I.D. at End (1), (3), (4)	Wall Thickness (3)	Centre-to-End Dimension A,B,C,M	Centre-to-Centre O	Back-to-Face K	Alignment of Ends U	Overall Length H	Overall Length E
½ to 2½	0.06 -0.03	0.03	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
3 to 3 ½	0.06	0.06	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
4	0.06	0.06	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
5 to 8	0.09 -0.06	0.06	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.25
10 to 18	0.16 -0.12	0.12	Not less than 87.5% of nominal thickness	0.09	0.38	0.25	0.06	0.09	0.25
20 to 24	0.25 -0.19	0.19	Not less than 87.5% of nominal thickness	0.09	0.38	0.25	0.06	0.09	0.25
26 to 30	0.25 -0.19	0.19	Not less than 87.5% of nominal thickness	0.12	…	…	…	0.19	0.38
32 to 48	0.25 -0.19	0.19	Not less than 87.5% of nominal thickness	0.19	…	…	…	0.19	0.38

NOMINAL PIPE SIZE NPS	ANGULARITY TOLERANCES	ANGULARITY TOLERANCES	ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
	Off Angle Q	Off Plane P	(1) Out-of-round is the sum of absolute values of plus and minus tolerance. (2) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9. (3) The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.(4) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.
½ to 4	0.03	0.06
5 to 8	0.06	0.12
10 to 12	0.09	0.19
14 to 16	0.09	0.25
18 to 24	0.12	0.38
26 to 30	0.19	0.38
32 to 42	0.19	0.50
44 to 48	0.18	0.75

Dimensions butt welded Stub Ends schedule 10SMSS SP-43 type A/B

NPS	OD	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

NPS	OD	T	G	F	R Type A	R Type B
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

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given.

DIMENSIONAL TOLERANCES OF STUB ENDS MSS SP-43

Nominal Pipe Size	1/2 up to 2.1/2	3 to 3.1/2	4	5 to 8	10 to 18	20 to 24
Outside Diameter at Welding End (OD)	0.8	0.8	0.8	+ 1.6 – 0.8	+ 2.29 – 0.76	+ 3.05 – 0.76
Overall Length (F)	1.6	1.6	1.6	1.6	2	2
Outside Diameter of Lap (G)	+ 0 – 0.76	+ 0 – 0.76	+ 0 – 0.76	+ 0 – 0.76	+ 0 – 1.6	+ 0 – 1.6
Thickness of Lap (T)	+ 1.52 – 0	+ 1.52 – 0	+ 1.52 – 0	+ 1.52 – 0	+ 1.52 – 0	+ 1.52 – 0
Fillet Radius of Lap (R)	+ 0 – 0.76	+ 0 – 0.76	+ 0 – 1.6	+ 0 – 1.6	+ 0 – 1.6	+ 0 – 1.6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated.

Notes:

Type A for Lap Joint Flanges
Type B for Slip On Flanges
MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.