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Quality Tubing For Over 25 Years

Industry Standards and Select Conversions of Precision Tubing

ASTM TABLES

ASTM B 251 Wall thickness Tolerances for Copper and Copper. Alloy Tube (Applicable to Specifications B 68, B 75, and B 135 )Note- Maximum Deviation at any point: The following tolerances are plus and minus, if tolerances all plus or all minus are desired, double the values given

Outside Diameter, inches, (mm)
Wall Thickness, in (mm) 1/32 (0.794) 1/8 (3.18). incl Over 1/8 (3.18) to 5/8 (15.9). incl Over 5/8 (15.9) to 1 (25.4). incl Over 1 (25.4) to 2 (50.8).incl
Up to 0.017 (0.432), incl 0.002
(0.051)
0.001
(0.025)
0.0015
(0.038)
0.002
(0.051)
Over 0.017 (0.432) to 0.024
(0.610), incl
0.003
(0.076)
0.002
(0.051)
0.002
(0.051)
0.0025
(0.064)
Over 0.024 (0.610) to 0.034
(0.864), incl
0.003
(0.076)
0.0025
(0.064)
0.0025
(0.064)
0.003
(0.076)
Over 0.034 (0.864) to 0.057
(1.48), incl
0.003
(0.076)
0.003
(0.076)
0.0035
(0.089)
0.0035
(0.089)
Over 0.057 (1.48) to 0.082
(2.08), incl
0.0035
(0.089)
0.004
(0.10)
0.004
(0.10)
Over 1.082 (2.08) to 0.119
(3.02), incl
0.004
(0.10)
0.005
(0.13)
0.005
(0.13)
Over 0.119 (3.02) to 0.164
(4.17), incl
0.005
(0.13)
0.006
(0.15)
0.006
(0.15)
Over 0.164 (4.17) to 0.219
(5.56), incl
0.007
(0.18)
0.075
(0.19)
0.008
(0.20)

When round tube is ordered by outside and inside diameter, the maximum plus and minus deviation of the wall thickness from the nominal at any point shall not exceed the values in the table by more the 50 percent.

 

ASTM B251 Average Diameter Tolerances for Copper and Copper-Alloy Tube (Applicable to specifications B 68, B 75, and B 135)

Specified Diameter, in. (mm) Diameter to Which Tolerances Applies Tolerance, Plus and minus, in. (mm)
Up to 1/8 (3.18), incl Inside or outside 0.002 (0.051)
Over 1/8 (3.18) to 5/8 (15.9),incl Inside or outside 0.002 (0.051)
Over 5/8 (15.9) to 1 (25.4),incl Inside or outside 0.0025 (0.064)
Over 1 (25.4) to 2 (50.8),incl Inside or outside 0.003 (0.076)

Copper Alloy No Copper, % Lead, % Iron. max. % Zinc, %
220 89.0 – 91.0 005 max 0.05 remainder
230 84.0 – 96.0 0.06 max 0.05 remainder
260 68.5 – 71.5 0.07max 0.05 remainder
270 63.0 – 68.5 0.10max 0.07 remainder
272 62.0 – 65.0 0.07max 0.07 remainder
280 59.0 – 63.0 0.30max 0.07 remainder
330 65.0 – 68.0 0.20 – 0.8 0.07 remainder
332 65.0 – 68.0 1.3 – 2.0 0.07 remainder
335 62.2 – 66.5 0.3 – 0.8 0.10 remainder
370 59.0 – 62.0 0.9 – 1.4 0.15 remainder
Nominal composition %
Copper Alloy No Previously Used Designation Copper Zinc Lead
220 7 90.0 10
230 1 85.0 15.0
260 2 70.0 30.0
270 9 65.0 35.0
272 8 63.0 37.0
280 5 60.0 40.0
330 3 66.0 33.5 0.5
332 4 66.0 32.4 1.6
335 63.0 36.5 0.5
370 6 60.0 39.0 1.0

The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in these standards. Users of these standards are expressly advised that determination of the validity of any such patent right, and the risk of infringement of such rights, are entirely their own responsibility.
Reprinted By Permission Of The American Society For Testing And Materials, Copyright.


Conversion Factors
MULTIPLY BY OBTAINING
Centimeters – cm 0.03937 Inches
Centimeters – cm 0.01 Meters – m
Centimeters – cm 10 Milimeters – mm
Cubic Centimeters – cm 3 0.06102 Cubic Inches – in 3
Cubic centimeters – cm 3 10-6 Cubic meters -m 3
Cubic feet – ft 3 1728 Cubic Inches – in 3
Cubic feet – ft 3 0.02832 Cubic meters -m 3
Cubic inches – in 3 16.39 Cubic centimeters -cm 3
Cubic meters- m 3 35.31 Cubic feet – ft 3
Cubic yards – yd 3 0.7646 Cubic meters -m 3
Feet – ft 30.48 Centimeter cm
Feet 0.3048 Meters – m
Feet/ minute 0.3048 Meters / minute
Gallons 3.785 x 10 -3 Cubic meters m 3
Gallons 3.785 Liters – ltr
Grams – g 10 -3 Kilograms – kg
Grams – g 2.2046 Pounds – lbs
Inches 2.54 Centimeters – cm
Inches 2.54 Centimeters – cm
Inches 25.4 Millimeters- mm
Kilograms – kg 2.2046 Pounds – lbs
Kilograms – kg 10 3 Grams – g
kg/mm2 1422 lb/in2
Kilometeres – kg 3281 Feet – ft
Liters 0.2642 Gallons
Meters – m 100 Centimeters – cm
Meters – m 3.281 Feet – ft
Meters – m 39.37 Inches
Meters – m 103 Millimeters – mm
Miles 5280 Feet – ft
Miles 1.609 Kilometers – km
Miles 1760 Yards
Ounces 28.349527 Grams – g
Pounds – lbs 453.59 Grams – g
Lb/in2 7.03 x 10-4 kg/mm2
Square centimeters – cm2 0.1550 Square inch – in2
Square feet – ft2 929 Square centimeter – cm2
Square inches – in2 6.452 Square centimeter – cm2
Square inches – in2 645.2 Square millimeters – mm2
Square inches – in2 645.2 Square millimeters – mm2
Square kilometer – km2 0.3861 Square mile
Square meters – m2 10.76 Square feet – ft2
Square miles 2.59 Square kilometers – km2
Square millimeters – mm2 1.55 x 10-3 Square inches – in2
Tons (long) 2240 Pounds
Tons (long) 1016 Kiligrams-kg
Tons (metric) 2205 Pounds
Tons (metric) 103 Kilograms – kg
Tons (short) 2000 Pounds
Yards 0.9144 meters – m

Temperature:
Centigrade – C = 5/9(F – 32)
Farenheit – F = 9/5C + 32
Tensile Strength
Temper Lbs/In2 Kg/mm2
Soft 48,350 – 51,200 34 – 36
1/8 Hard 52,600 – 56,900 37 – 40
1/4 Hard 54,000 – 61,200 38 – 43
1/2 Hard 62,500 – 72,500 44 – 51
3/4 Hard 68,250 – 74,000 48 – 52
Extra Hard 74,000 – 88,200 52 – 62
Hard 85,300 – 91,000 60 – 64


Hardness Conversions
Härte / Hardness / Dureté
Vickers
HV 30
Brinell
HB 30
Rockwell 2)
HRB HRC
Zugfestigkeit σ B
Tensile strength σ B
Résistance σ B
N/mm 2
80 80 36,4 270
85 85 42,4 290
90 90 47,4 310
95 95 52,0 320
100 100 56,4 340
105 105 60,0 360
110 110 63,4 380
115 115 66,4 390
120 120 69,4 410
125 125 72,0 420
130 130 74,4 440
135 135 76,4 460
140 140 78,4 470
145 145 80,4 490
150 150 82,2 500
155 155 83,8 520
160 160 85,4 540
165 165 86,8 550
170 170 88,2 570
175 175 89,6 590
180 180 90,8 600
185 185 91,8 620
190 190 93,0 640
195 195 94,0 660
200 200 95,0 670
205 205 95,8 680
210 210 96,6 710
215 215 97,6 720
220 220 98,2 730
225 225 99,0 750
230 230 19,2 760
235 235 20,2 780
240 240 21,2 800
245 245 22,1 820
250 250 23,0 830
255 255 23,8 850
260 360 24,6 870
265 265 25,4 880
270 270 26,2 900
275 275 26,9 920
280 280 27,6 940
285 285 28,3 950
290 290 29,0 970
295 295 29,6 990
300 300 30,3 1010
310 310 31,5 1040
320 320 32,7 1080
330 330 33,8 1110
340 340 34,9 1140
350 350 36,0 1170
360 359 37,0 1200
370 368 38,0 1230
380 376 38,9 1260
390 385 39,8 1290
400 392 40,7 1320
410 400 41,5 1350
420 408 42,4 1380
430 415 43,2 1410
440 423; 44,0 1430
450 430 44,8 1460
460 45,6
470 46,3
480 47,0
490 47,7
500 48,3
510 49,1
520 49,7
530 50,4
540 51,0
550 51,6
560 52,2
570 52,8
580 53,3
590 53,9
600 54,4
610 55,0
620 55,5
630 56,0
640 56,5
650 57,0
660 57,5
670 58,0
680 58,5
690 59,0
700 59,5
720 60,4
740 61,2
760 62,0
780 62,8
800 63,6
820 64,3
840 65,0
860 65,7
880 66,3
900 66,9
920 67,5
940 68,0

1) Alle mittels verschiedener Härteprüfverfahren an verschiedenen Werkstoffen ermittelten Härtewerte sind nur annähernd vergleichbar.
All hardness values determined on different materials using various hardness testing methods are only approximately comparable.
Les indices de dureté déterminés par des essais différents sur des matières différentes ne sont qu‘approximativement comparables.

2) Die auf eine Dezimale angegebenen Rockwellwerte dienen nur der Interpolation und sind im Endergebnis auf ganze Zahlen zu runden.
The Rockwell values given to one decimal place serve only for interpolation and should be rounded to integers in the end result.Les duretés Rockwell à une décimale ne servent qu‘à l’interpolation, le résultat doit être arrondi au nombre entier.


CONVENIENT FORMULAS & TABLES

WALL THICKNESS CALCULATION

Known:

Outside Diameter (OD) and Inside Diameter (ID) Wall Thickness (W) = (OD-ID) / 2  Example: .375″ OD x .335″ ID  W = (.375 – .335) / 2 = .020″

OUTSIDE DIAMETER CALCULATION

Known:

Inside Diameter and Wall Thickness (W)  Outside Diameter = 2(W) + ID  Example: .335″ ID x .020″ Wall  OD = 2(.020) + .335 = .375″

INSIDE DIAMETER CALCULATION

Known:

Outside Diameter and Wall Thickness Inside Diameter = OD – 2(W)  Example: 3/8″ OD x .020″ Wall ID = .375 – 2(.020) = .335

WEIGHT CALCULATIONS

The following densities and constants are being used in calculating weights:

ALLOY DENSITY “d”
lb/in3
CONSTANT “K”
d(12 Π)
DENSITY
g/cm3
220 .318 11.98 8.80
230 .316 11.91 8.75
260 .305 11.61 8.53
270 .306 11.53 8.47
272 .305 11.49 8.44
280 .303 11.42 8.39
330 .307 11.57 8.50
332 .308 11.61 8.53
370 .304 11.45 8.41

For a round tube, one foot long, the weight in lb/ft = d(Volume) = d(Π) (OD – W) (W)(L)where L is the length in inches hence, lb/ft = d(12 Π)(OD – W)(W) = K (OD – W) (W)

Example: 3/8″ OD x .020″ W, Alloy 272
lb/ft = 11.49 (.375 – .020)(.020) = .0816

To find lb/piece use the following formula:
lb/pc = K(OD-W)(W)(L2) where (L2) is length of piece in feet
Example: 3/8” OD x .020” Wall x 16.250” long, Alloy 272
lb/pc = 11.49(.375-.020)(.020)(16.250)/12 = .110

$/LB TO $/FT CONVERSION

Calculation to convert from dollars per pound to
dollars per foot :

1, Use weight table or find weight by formula
in lb/ft.

2. Multiply price per pound by pounds per
foot.
Example: 3/8″ OD x .020 Wall, Alloy
272. Price $1.52 per lb.
$/ft =11.49(.375 – .020)(.020)(1.52)=.124

$/LB TO $/PC CONVERSION

Calculation to convert from dollars per pound to
dollars per piece:

1. Find pounds per piece using given formula.

2. Multiply price per pound by pounds per
piece.
Example: 3/8″ OD x .020″ Wall x 16.250″ long, Alloy 272, price $1.52 per lb.
$/pc = 11.49(.375-.020)(.020)(16.250 / 12)(1.52)
=.167

CONVERSION TABLE FOR TENSILE STRENGTH POUNDS PER SQ INCH TO KILOGRAMS PER SQ MILLIMETERS
Lbs/In2 Kg/mm2
36,000 25.32
38,000 26.72
40,000 28.13
42,000 29.54
44,000 30.94
46,000 32.35
48,000 33.76
50,000 35.16
52,000 36.37
54,000 37.97
56,000 39.38
58,000 40.79
60,000 42.19
62,000 43.60
64,000 45.01
66,000 46.41
68,000 47.82
70,000 49.23
72,000 50.63
74,000 52,04
76,000 53.45
78,000 54.85
80,000 56.26
82,000 57.67
84,000 59.07
86,000 60.48
88,000 61.88
90,000 63.29
92,000 64.70
94,000 66.10
96,000 67.51
98,000 68.92
100,000 70.32
102,000 71.73
104,000 73.14
106,000 74.54

272 BRASS TUBING WEIGHT TABLE
WEIGHT TABLE FOR ALLOY 272 BRASS TUBING
IN POUNDS PER FOOT AND KILOGRAMS PER METER
0UTSIDE DIAMETERS IN INCHES AND MILLIMETERS
WALL THICKNESS
INCHES
MILLIMETERS
.0625
1/16
1.589
.0781
6/64
1.984
.0938
3/32
2.381
.1094
7/64
2.778
.1250
1/8
3.175
.1406
9/64
3.572
.1563
6/32
3.969
.1875
3/16
4.763
.2188
7132
5.556
.2500
1/4
6.350
.2813
9/32
7.144
.3125
5/16
7.938
.3438
11/32
8.731
.3750
3/8
9.525
.4063
13/32
10.319
.4375
7/16
11.113
.50
1/2
12.70
.006
.1524
.0039
.0058
.0050
.0074
.0061
.0089
.0071
.0106
.0082
.0122
.0093
.0138
.0104
.0155
.0125
.0186
.0147
.0219
.0168
.0250
.0190
.0283
.0211
.0314
.0233
.0347
.0254
.0378
.0276
.0411
.0297
.0442
.0340
.0506
.008
.2032
.0050
.0074
.0064
.0095
.0079
.0118
.0093
.0138
.0108
.0160
.0122
.0182
.0136
.0202
.0165
.0248
.0194
.0289
.0222
.0330
.0251
.0373
.0280
.0417
.0309
.0460
.0337
.0501
.0366
.0545
.0395
.0588
.0452
.0673
.010
.2540
.0060
.0090
.0078
.0116
.0096
.0143
.0114
.0170
.0132
.0196
.0150
.0223
.0168
.0250
.0204
.0304
.0240
.0357
.0278
.0411
.0312
.0484
.0348
.0518
.0384
.0571
.0419
.0623
.0455
.0677
.0491
.0731
.0583
.0838
.012
.3048
.0070
.0104
.0091
.0136
.0113
.0168
.0134
.0199
.0156
.0232
.0177
.0263
.0199
.0298
.0242
.0360
.0285
.0424
.0328
.0488
.0371
.0582
.0414
.0616
.0457
.0680
.0601
.0745
.0544
.0809
.0587
.0873
.0673
.1001
.014
.3556
.0078
.0116
.0103
.0153
.0228
.0190
.0153
.0228
.0179
.0266
.0204
.0304
.0299
.0341
.0279
.0415
.0329
.0490
.0380
.0585
.0430
.0640
.0480
.0714
.0531
.0790
.0581
.0865
.0631
.0939
.0681
.1012
.0782
.1164
.016
.4064
.0085
.0126
.0114
.0170
.0143
.0213
.0172
.0256
.0200
.0298
.0229
.0341
.0258
.0384
.0315
.0469
.0373
.0665
.0430
.0640
.0488
.0726
.0545
.0811
.0603
.0897
.0660
.0982
.0717
.1087
.0775
.1153
.0890
.1324
.018
.4572
.0092
.0137
.0124
.0185
.0157
.0233
.0189
.0281
.0221
.0329
.0254
.0378
.0286
.0426
.0351
.0522
.0415
.0618
.0480
.0714
.0544
.0809
.0609
.0906
.0674
.1003
.0738
.1098
.0803
.1098
.0868
.1190
.0997
.1484
.020
.508
.0098
.0140
.0134
.0199
.0169
.0251
.0205
.0305
.0241
.0359
.0277
.0412
.0313
.0466
.0385
.0573
.0457
.0680
.0529
.0787
.0600
.0893
.0672
.1000
.0744
.1107
.0816
.1214
.0888
.1321
.0969
.1427
.1103
.1641
.022
.5588
.0102
.0162
.0142
.0211
.0181
.0269
.0221
.0329
.0260
.0387
.0300
.0448
.0339
.0504
.0418
.0522
.0497
.0740
.0576
.0857
.0655
.0975
.0734
.1092
.0813
.1210
.0892
.1327
.0971
.1445
.1050
.1582
.1208
.1798
.024
.6096
.0106
.0158
.0149
.0222
.0192
.0286
.0235
.0350
.0279
.0415
.0322
.0479
.0365
.0643
.0451
.0671
.0537
.0799
.0623
.0927
.0709
.1055
.0796
.1184
.0882
.1312
.0968
.1440
.1064
.1568
.1140
.1696
.1313
.1954
.026
.6604
.0109
.0162
.0156
.0232
.0202
.0301
.0249
.0371
.0296
.0440
.0342
.0509
.0389
.0579
.0482
.0717
.0576
.0857
.0669
.0995
.0763
.1136
.0858
.1274
.0949
.1412
.1043
.1552
.1136
.1690
.1229
.1829
.1416
.2106
.028
.7112
.0111
.0165
.0161
.0240
.0212
.0315
.0262
.0390
.0312
.0464
.0362
.0539
.0413
.0615
.0513
.0763
.0614
.0914
.0714
.1062
.0815
.1213
.0915
.1362
.1016
.1512
.1116
.1661
.1217
.1811
.1317
.1960
.1519
.2260
.030
.762
.0112
.0167
.0166
.0247
.0220
.0327
.0274
.0408
.0327
.0489
.0381
.0567
.0435
.0647
.0543
.0808
.0651
.0969
.0758
.1128
.0868
.1289
.0974
.1449
.1081
.1609
.1169
.1769
.1297
.1930
.1405
.2091
.1620
.2411
.035
.889
.0173
.0257
.0236
.0351
.0299
.0445
.0362
.0539
.0425
.0632
.0488
.0726
.0613
.0912
.0739
.1100
.0865
.1287
.0990
.1473
.1116
.1661
.1242
.1848
.1367
.2034
.1493
.2222
.1619
.2409
.1870
.2783
.040
1.016
.0247
.0368
.0319
.0475
.0391
.0582
.0462
.0687
.0534
.0795
.0678
.1009
.822
.1223
.0965
.1436
.1109
.1650
.1252
.1863
.1396
.2077
.1540
.2292
.1683
.2504
.1827
.2719
.2114
.3140
.040
1.016
.045
1.143
.0333
.0496
.0414
.0615
.0494
.0735
.0575
.856
.898
.1336
.1060
.1577
.1222
.1818
.1383
.2058
.1545
.2299
.1706
.2539
.1858
.2780
.2029
.3019
.2353
.3501
.050
1.770
.0431
.0541
.0521
.0776
.0611
.0909
.0790
.1176
.970
.1443
.1149
.1710
.1329
.1978
.1506
.2244
.1688
.2612
.1867
.2778
.2047
.3046
.2226
.3312
.2585
.3846


ORDERING INFORMATION

In order to expedite your purchases the following information should be included in your order:

ALLOY

Specify Copper Alloy Number or Chemical
Requirements.

TEMPER

Such as hard, 1/2 hard, soft.

QUANTITY

In pounds, feet, pieces, kilograms or meters.

DIMENSIONS

Dimensions of a given tube shall be specified
with respect to any two, but not all three of
the following:

  • Outside Diameter (O.D.)
  • Inside Diameter (I.D.)
  • Wall Thickness (W)

The standard method of specifying wall thickness
shall be in decimal fractions. Dimensions shall
be in inches or millimeters.

TOLERANCES

Unless otherwise specified, tolerances shall be in
accordance with ASTM specification B251, current
edition.

LENGTH

Mill length in feet or meters
Cut -to -Length in inches or millimeters
Tubing in coils in length or weight
Include length tolerance on straight tubing

SPECIFICATIONS

ASTM, CDA, SAE, DIN etc.

END USE

If possible specify end use of tubing

SAMPLES

Specify if pre -production samples are required

DATE REQUIRED

Include date when tubing are needed at destination

PACKING, MARKING
SHIPPING

Specify if any special requirements are needed
concerning packing, marking or shipping

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