Standard pipe bend radius chart

Looking for Long & Short Radius Pipe Elbow & Return Dimensions in mm? Find here ASME B16.9 minimum steel pipe bending along with tolerances.

Standard pipe bend radius chart shows the bending radiuses available in pipes bending products. Piping bends are pipe fittings whose bending radius can range from 1D to 10D generally. There are different dimensions and categories in the standard bend radius for pipe fittings. The bending radius is expressed in relation to the pipe’s outer diameter. If the radius is equal to the pipes diameter then the radius is 1D. The radius is 2 times greater than the outer diameter then the pipes bends is 2D. There are also different standard pipe bend angles ranging from 15% degrees to 180 degrees.

Carbon Steel Pipe Bend

Carbon Steel Pipe Bend

Long Radius Bend

Long Radius Bend

The angle defines how quickly or slowly the direction of flow is changed and what kind of pressure is excerpted onto the piping bend wall as a result of the change in direction. To know that different bending radiuses and sizes of the piping bends, please contact us to receive a pipe bending radius chart. This chart provides the available piping bend radiuses with wall thickness and the size of the bending. There are different specifications to cover different application requirements and the piping bending can be made from any different material grade.

Pipe Radius Chart

Table of Content


The most used materials are austenitic stainless steels and carbon steels. You can contact us to know more about the standard pipe bend size, pricing, dimensions and material grades. The application of the piping bends can be seen in many piping applications such as general corrosive services, water lines, oil and gas, petroleum and other industrial piping applications.

View Cold and Hot pipe bend and steel elbow size chart and specification.


Long Radius Pipe Bends & Return Dimensions

Long Radius Pipe Bends
NPSOutside DiameterBack to FaceCenter to Center
Inch.ODABCD
1/221.348–76–
3/426.743–57–
133.456417651
1 1/442.270529564
1 1/248.3836211476
260.310681152102
2 1/273132100191127
388.9159121229152
3 1/2101.6184140267178
4114.3210159305203
5141.3262197381254
6168.3313237457305
8219.1414313610406
10273.1518391762508
12323.9619467914610
14355.67115331067711
16406.48136101219813
18457.29146861372914
20508101676215241016
22559111883816761118
24610121991418291219
All dimensions are in mm

Check Standard bend radius for pipe in long and short radius.


Standard Pipe Bend Radius Chart

Standard pipes Spec . Bauart 5 2,5D
DN Diameter [ØD] CLR CLR CLR
20 26,9 110   67
25 33,7 110   84
32 42,4 110   106
40 48,3 110   212
50 60,3 125   151
65 76,1   175 190
80 88,9   205 222
100 114,3   270 286
125 139,7   330 350
150 168,3   390 421
200 219,1   510  
250 273   650  
300 323,9   775  
350 355,6   850  
400 406,4   970  
500 508   1245  

Contact us for availability of Standard pipe bend angles in 45/ 90/ 180 Degree.

Pipe Fittings Dimensions Tolerance as per ASME B16.9

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

Short Radius Bends Standard Radius

Nominal Piping Size (NPS) Outside Diameter at Bevel D Center-to-End 90 Deg Elbows A
1 33.4 25.4
1-1/4 42.2 31.8
1-1/2 48.3 38.1
2 60.3 50.8
2-1/2 73.0 63.5
3 88.9 76.2
3-1/2 101.6 88.9
4 114.3 101.6
5 141.3 127.0
6 168.3 152.4
8 219.1 203.2
10 273.0 254.0
12 323.8 304.8
14 355.6 355.6
16 406.4 406.4
18 457 457.2
20 508 508.0
22 558 558.8
24 610 609.6

Radius Table of Long Radius Bends

Nominal Piping Size (NPS) Outside Diameter at Bevel D Center-to-End
90 Deg Elbows A 45 Deg Elbows B
1/2 21.3 38.1 15.7
3/4 26.7 38.1 19.1
1 33.4 38.1 22.4
1-1/4 42.2 47.8 25.4
1-1/2 48.3 57.2 28.4
2 60.3 76.2 35.1
2-1/2 73.0 95.2 44.4
3 88.9 114.3 50.8
3-1/2 101.6 133.4 57.2
4 114.3 152.4 63.5
5 141.3 190.5 79.2
6 168.3 228.6 95.2
8 219.1 304.8 127.0
10 273.0 381.0 158.8
12 323.8 457.2 190.5
14 355.6 533.4 222.2
16 406.4 609.6 254.0
18 457 685.8 285.8
20 508 762.0 317.5
22 558 838.2 342.9
24 610 914.4 381.0

Hybrid CNC Tube Bending Radius Chart

Tubing O.D. Radius Material Radius
1.25”, 31.75mm, 1 ¼-inches 2”, 50.8mm, 2-inches Stainless steel and Inconel  
0.25”, 6.35mm, ¼-inch .5”, 12.7mm, ½-inch Stainless steel .5625”, 14.28mm, 9/16-inch 
1”, 25.4mm, 1-inch 1.5”, 38mm, 1 ½-inches Stainless steel and Aluminum  
.375”, 9.52mm, ⅜-inch .9375”, 23.8mm, 15/16-inch  Stainless steel and Copper  
1.5”, 38mm, 1 ½-inches 2.25”, 57.15mm, 2 ¼-inches Stainless steel  
.5”, 12.7mm, ½-inch .5”, 12.7mm, ½-inch Stainless steel 1.5”, 38mm, 1 ½-inches
.75”, 19mm, ¾-inch 1.125”, 28.5mm, 1 -⅛” inches Stainless steel and Aluminum  

Weight Formula for Cold and Hot piping bend

  • ❖ Weight / kg = 0.0433 ( D – T ) TRθ / 100000 + L
  •  ➔ θ = Bend angle
  •  ➔ D = Outside diameter
  •  ➔ L = Weight of double sides straight length
  •  ➔ T = Thickness in mm
  •  ➔ R = Bend radius

Minimum piping bends and elbow radius calculator

Bending Elements

✠ Calculating Wall Thickness

ISO 161-1 uses the following formula to calculate the wall thickness of pipes:

  • σs=PN.(da-s/20.s)=PN.S
  • σs = hoop stress (N/mm2) | PN = normal pressure (bar) | da = external piping diameter (mm)
  • s = wall thickness (mm) | S = pipes serial (-)

✠ Calculating Standard Dimension Ratio

Using the same variables as above, the standard dimension ratio (i.e. SDR) of a pipes can be calculated thusly:

SDR = da/s

HDPE Pipes SDR Min. Long-Term
Cold Bending Radius
9 or less 20x O.D.
11, 13.5 25x O.D.
15.5, 17, 21 27x O.D.
26 34x O.D.
32.5 42x O.D.
41 52x O.D.
With fitting or flange
present in bends		 100x O.D.

✠ Calculating CLR (Center Line Radius) for Bending Angle

  • π(2r) or πD
  • π (pi) = 3.1416

For example, if your die creates a 2.2 inch radius, and you need to create a 35° bends

3.1416(2x2.2) = 13.823/360 = 0.0384

to calculate CLR of 35° bends

0.0384 x 35 = 1.344”

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