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Stub Ends(ASME B 16.9)

Pipe Fittings

Tees

Reducers

Stub Ends

Elbows

Returns & Bends

Caps

Pipe Nipples

ASME B16.9 Stub Ends Specifications

Material Grades

  • ASTM A403 WP 304
  • ASTM A403 WP 304L
  • UNS S30400
  • UNS S30403
  • Stainless Steel 304
  • Stainless Steel 304L
  • Carbon Steel
  • Alloy Steel
  • Duplex Steel
  • Super Duplex Steel
  • Nickel Alloys

Stub End Types

  • Type A Stub End
  • Type B Stub End
  • Long Pattern Stub End
  • Short Pattern Stub End
  • Lap Joint Stub End
  • Butt Weld Stub End
  • Seamless Stub End
  • Welded Stub End
  • Fabricated Stub End

Manufacturing Standards

  • ASME B16.9
  • MSS SP-43
  • ASME B16.25
  • ASTM A403
  • ASTM A234
  • ASTM A420
  • ASTM A815
  • JIS B2312
  • JIS B2313
  • DIN Standards
  • EN Standards

Size & Schedule

  • Size: NPS 1/2" – NPS 24"
  • Schedule 5S
  • Schedule 10S
  • Schedule 40S
  • Schedule 80S
  • Schedule 160
  • Schedule XS
  • Schedule XXS
  • Custom Sizes Available

Connection & Pressure

  • Butt Weld Connection
  • Lap Joint Flange Connection
  • Flanged Connection
  • Welded Connection
  • Seamless Construction
  • Pressure Class: 150 – 2500 LBS
  • Custom Pressure Ratings

Design & Manufacturing

  • Hot Forged
  • Hot Formed
  • Cold Formed
  • Mandrel Formed
  • Seamless Construction
  • Welded Construction
  • Precision Machined
  • Custom Fabrication

Mechanical Properties

  • Tensile Strength: 485 MPa Min.
  • Yield Strength: 170 MPa Min.
  • Elongation: 40% Min.
  • Rockwell Hardness: 92 HRB Max.
  • Brinell Hardness: 201 HB Max.

Chemical Composition

  • Chromium: 18.0 – 20.0%
  • Nickel: 8.0 – 12.0%
  • Carbon: 0.030% Max.
  • Manganese: 2.00% Max.
  • Silicon: 0.75% Max.
  • Phosphorus: 0.045% Max.
  • Sulfur: 0.030% Max.
  • Nitrogen: 0.10% Max.
  • Iron: Balance

Physical Properties

  • Density: 8000 kg/m³
  • Elastic Modulus: 193 GPa
  • Thermal Expansion: 17.2 × 10⁻⁶ /°C
  • Thermal Conductivity: 16.2 W/m·K
  • Specific Heat: 500 J/kg·K
  • Electrical Resistivity: 720 nΩ·m

Testing & Inspection

  • Dimensional Inspection
  • Visual Inspection
  • Material Test Certificate
  • Chemical Analysis
  • Mechanical Testing
  • Hardness Testing
  • Ultrasonic Testing
  • Dye Penetrant Testing
  • Radiographic Testing

Surface Treatment

  • Pickling
  • Passivation
  • Solution Annealing
  • Heat Treatment
  • Shot Blasting
  • Polishing
  • Machining
  • Custom Finishing

ASME B16.9 Stub End Dimensions Chart

NPS Barrel O.D. Min. (mm) Barrel O.D. Max. (mm) Long Pattern F (mm) Short Pattern F (mm) Radius R (mm) Lap Diameter G (mm)
1/2" 20.5 22.8 76 51 3 35
3/4" 25.9 28.1 76 51 3 43
1" 32.6 35.0 102 51 3 51
1 1/4" 41.4 43.6 102 51 5 64
1 1/2" 47.5 49.9 102 51 6 74
2" 59.5 62.4 152 64 8 92
2 1/2" 72.2 75.3 152 64 8 105
3" 88.1 91.3 152 64 10 127
3 1/2" 100.8 104.0 152 76 10 140
4" 113.5 116.7 152 76 11 157
5" 140.5 144.3 203 76 11 186
6" 167.5 171.3 203 89 13 216
8" 218.3 222.1 203 102 13 270
10" 272.3 277.2 254 127 13 324
12" 323.1 328.0 254 152 13 381
14" 354.8 359.9 305 152 13 413
16" 405.6 411.0 305 152 13 470
18" 456.0 462.0 305 152 13 533
20" 507.0 514.0 305 152 13 584
22" 558.0 565.0 305 152 13 641
24" 609.0 616.0 305 152 13 692

ASME B16.9 Stub End Schedule & Weight Chart

NPS Schedule Outside Diameter (mm) Thickness (mm) Lap Diameter G (mm) Length F (mm) Radius R (mm) Weight / Pc (kg)
1/2" 10S 21.3 2.11 34.9 50.8 3.18 0.07
1/2" 40S 21.3 2.77 34.9 50.8 3.18 0.09
3/4" 10S 26.7 2.11 42.9 50.8 3.18 0.10
3/4" 40S 26.7 2.87 42.9 50.8 3.18 0.12
1" 10S 33.4 2.77 50.8 50.8 3.18 0.16
1" 40S 33.4 3.38 50.8 50.8 3.18 0.17
1 1/4" 10S 42.2 2.77 63.5 50.8 4.76 0.22
1 1/4" 40S 42.2 3.56 63.5 50.8 4.76 0.25
1 1/2" 10S 48.3 2.77 73.0 50.8 6.35 0.25
1 1/2" 40S 48.3 3.68 73.0 50.8 6.35 0.31
2" 10S 60.3 2.77 92.1 63.5 7.94 0.43
2" 40S 60.3 3.91 92.1 63.5 7.94 0.61
2 1/2" 10S 73.0 3.05 104.8 63.5 7.94 0.57
2 1/2" 40S 73.0 5.16 104.8 63.5 7.94 0.80
3" 10S 88.9 3.05 127.0 63.5 9.53 0.73
3" 40S 88.9 5.49 127.0 63.5 9.53 1.13
4" 10S 114.3 3.05 157.2 76.2 11.11 1.09
4" 40S 114.3 6.02 157.2 76.2 11.11 1.87
5" 10S 141.3 3.40 185.7 76.2 11.11 1.47
5" 40S 141.3 6.55 185.7 76.2 11.11 2.28
6" 10S 168.3 3.40 215.9 88.9 12.70 2.15
6" 40S 168.3 7.11 215.9 88.9 12.70 3.57
8" 10S 219.1 3.76 269.9 101.6 12.70 3.22
8" 40S 219.1 8.18 269.9 101.6 12.70 6.07
10" 10S 273.1 4.19 323.9 127.0 12.70 5.13
10" 40S 273.1 9.27 323.9 127.0 12.70 10.07
12" 10S 323.9 4.57 381.0 152.4 12.70 8.16
12" 40S 323.9 9.53 381.0 152.4 12.70 14.29
14" 10S 355.6 4.78 412.8 152.4 12.70 10.89
16" 10S 406.4 4.78 469.9 152.4 12.70 12.70
18" 10S 457.2 4.78 533.4 152.4 12.70 17.24
20" 10S 508.0 5.54 584.2 152.4 12.70 21.77

Chemical Composition

Carbon (C)
0.030% Max.
Chromium (Cr)
18.00–20.00%
Nickel (Ni)
8.00–12.00%
Manganese (Mn)
2.00% Max.
Silicon (Si)
0.75% Max.
Phosphorus (P)
0.045% Max.
Sulfur (S)
0.030% Max.
Nitrogen (N)
0.10% Max.
Iron (Fe)
Balance
Density: 8000 kg/m³
Elastic Modulus: 193 GPa
Thermal Expansion: 17.2 × 10⁻⁶ /°C
Thermal Conductivity: 16.2 W/m·K
Specific Heat: 500 J/kg·K
Electrical Resistivity: 720 nΩ·m

Mechanical Performance

485
MPa (70 ksi)
Tensile Strength
170
MPa (25 ksi)
Yield Strength
40%
Minimum
Elongation
92
HRB Maximum
Rockwell Hardness
201
HB Maximum
Brinell Hardness
170
MPa Minimum
Yield Strength


MANUFACTURING

Forging Process

Each flange follows a rigorous 8-step forging and quality-control process to ensure conformance with ASTM A182 and ASME standards.

1

Material Selection

Prime 304 stainless steel billet sourced and certified.

2

Billet Preparation

Heat to 1100°C – 1250°C for optimal forgeability.

3

Forging

Shape billet into flange geometry under controlled pressure.

4

Heat Treatment

Solution anneal at 1040°C – 1120°C, then quench.

5

Machining & Finishing

CNC machining, drilling, and surface finishing.

6

Testing & Inspection

Tensile, hardness, PMI, visual and impact tests performed.