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ELECTRIC RESISTANCE WELDED CARBON 
AND ALLOY STEEL MECHANICALTUBING

1. SCOPE 



1.1 This specification covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. 
1.2 This specification covers mechanical tubing made from hot- or cld-rolled steel. 

1.3 This specification covers round, square, rectangular, and special shape tubing. 

Type Size Range(Round Tubing)
Electric-Resistance-Welded Tubing from Hot-Rolled Steel outside diameter from 3/4 to 15 in.(19.0 to 38.1mm)
wall from 0.065 to 0.650 in.(1.65 to 16.50mm)
Electric-Resistance-Welded Tubing from cold-Rolled Steel outside diameter form 3/8 to 8 in.(9.52 to 203.2mm)
wall from 0.028 to 0.134 in.(0.71 to 3.40mm)


1.4 Optional supplementary requirements are provided and when desired, shall be so stated in inch-pound units 
are to be refarded as the standard. 1.5 The values stated in inch-pund units are to be regarded as the standard.

Grade Remaks (Similar to JIS)
MT 1010 (STKM11)
MT 1015 (STKM12)
MTX1015 -
MT 1020 (STKM13)
MTX1020 -
1008 -
1010 -
MTX1015 -
1016 -
1017 -
1018 -
1019 -
1020 -
1021 -
1022 -
1023 -
1024 -
1025 -
1026 (STKM14)
1027 -
1030 (STKM15)
1033 -
1035 -
1040 -
1050 -
1060 -
1340 -
1524 -
4778 -
4130 -
4140 -
5130 -
8620 -
8630 -



  In such cases for Types 1 and 2 (A.W.H.R. and A.W.C.R.) the ovality may be 50% greater than the outside 
tolerances but the mean outside diameter shall be within the specified tolerance. 

For Types 3.4.5. and 6 (S.D.H.R., S.D.C.R., M.D., and S.S.I.D) the additional ovality shall be as follows 
but the mean outside diameter shall be within the specified tolerances ;

Outside Diameter in (mm) Additional Ovality Tolerance, in. (mm)
Up to 2 (50.8). incl 0.010 (0.25)
Over 2 to 3 (50.8 to 76.2). incl 0.015 (0.38)
Over 3 to 4 (76.2 to 101.6) incl 0.020 (0.51)
Over 4 to 5 (101.6 to 127.0) incl 0.025 (0.64)
Over 5 to 6 (127.0 to 152.4) incl 0.030 (0.76)
Over 6 to 7 (152.4 to 177.8) incl 0.035 (0.89)
Over 7 to 8 (177.8 to 203.2) incl 0.040 (1.02)
Over 8 to 9 (203.2 to 228.6) incl 0.045 (1.14)
Over 9 to 10 (228.6 to 254.0) incl 0.050 (1.27)
Over 10 to 11 (254.0 to 279.4) incl 0.055 (1.40)
Over 11 to 12 (279.4 to 304.8) incl 0.060 (1.52)
Over 12 to 13 (304.8 to 317.5) incl 0.065 (1.65)




  condition The types and conditions of tubing covered by this specification are: 

Type Number Code Letters Description
1 A.W.H.R "as-welded" from hot-rolled steel
2 A.W.C.R "as-welded" from cold-rolled steel
3 S.D.H.R "sink-drawn" hot-rolled steel
4 S.D.C.R "sink-drawn" cold-rolled steel
5 M.D mandrel drawn
6 S.S.I.D Special smooth inside diameter




Chemical Requirements for Standard Low-Carbon Steels A 


Note - chemistry represents heat analysis. Product analysis, except for rimmed or capped steel,
is to be in accordance with usual practice as shown in Table 3.


Grade Designation Composition, %
Carbon Maganese Phosphorus. max Sulfur. max
MT B 1010 0.05 - 0.15 0.30 - 0.60 0.035 0.035
MT 1015 0.10 - 0.20 0.30 - 0.60 0.035 0.035
MT X 1015 0.10 - 0.20 0.60 - 0.90 0.035 0.035
MT 1020 0.15 - 0.25 0.30 - 0.60 0.035 0.035
MT X 1020 0.15 - 0.25 0.70 - 1.00 0.035 0.035


A Rimmed or capped steels which may be used for the above grades are characterized by a lack of uiiformity
in their chemical composition, and for this reason produt analysis is not technologically appropriate unless 
misapplication is clearly indicated.

B The letters MT under grade designation indicate Mechanical Tubing.
TABLE 2 Chemical Requirements for Other Carbon and Alloy Steels
Note-Chemistry represents heat analysis Product analysis, except for rimmed or capped steel,
is to be in accordance with usual practice as shown in Table 3. 

Grade Designation Composition. %
Carbon Manganese Phosphorus. max Sulfur, max Silicon ...Nickel... Chromium Molybdenum
1008 0.10 max. 0.50 max 0.035 0.035 ... .... ... ...
1010 0.08-0.13 0.30-0.60 0.035 0.035 ... ... ... ...
1012 0.10-0.15 0.30-0.60 0.035 0.035 ... ... ... ...
1015 0.12-0.18 0.30-0.60 0.035 0.035 ... ... ... ...
1016 0.12-0.18 0.60-0.90 0.035 0.035 ... ... ... ...
1017 0.14-0.20 0.30-0.60 0.035 0.035 ... ... ... ...
1018 0.14-0.20 0.60-0.90 0.035 0.035 ... ... ... ...
1019 0.14-0.20 0.70-1.00 0.035 0.035 ... ... ... ...
1020 0.17-0.23 0.30-0.60 0.035 0.035 ... ... ... ...
1021 0.17-0.23 0.60-0.90 0.035 0.035 ... ... ... ...
1022 0.17-0.23 0.70-1.00 0.035 0.035 ... ... ... ...
1023 0.19-0.25 0.30-0.60 0.035 0.035 ... ... ... ...
1024 0.18-0.25 1.30-1.65 0.035 0.035 ... ... ... ...
1025 0.22-0.28 0.30-0.60 0.035 0.035 ... ... ... ...
1026 0.22-0.28 0.60-0.90 0.035 0.035 ... ... ... ...
1027 0.22-0.28 1.20-1.55 0.035 0.035 ... ... ... ...
1030 0.27-0.34 0.60-0.90 0.035 0.035 ... ... ... ...
1033 0.29-0.36 0.70-1.00 0.035 0.035 ... ... ... ...
1035 0.31-0.38 0.60-0.90 0.035 0.035 ... ... ... ...
1040 0.36-0.44 0.60-0.90 0.040 0.050 ... ... ... ...
1050 0.47-0.55 0.60-0.90 0.040 0.050 ... ... ... ...
1060 0.55-0.66 0.60-0.90 0.040 0.050 ... ... ... ...
1340 0.38-0.43 1.60-1.90 0.035 0.040 0.15-0.35 ... ... ...
1524 0.18-0.25 1.35-1.65 0.040 0.050 ... ... ... ...
4118 0.18-0.23 0.70-0.90 0.035 0.040 0.15-0.35 ... 0.40-0.60 0.08-0.15
4130 0.28-0.33 0.40-0.60 0.035 0.040 0.15-0.35 ... 0.80-1.10 0.15-0.25
4140 0.38-0.43 0.75-1.00 0.035 0.040 0.15-0.35 ... 0.80-1.10 0.15-0.25
5130 0.23-0.33 0.70-0.90 0.035 0.040 0.15-0.35 ... 0.80-1.10 ...
8820 0.18-0.23 0.70-0.90 0.035 0.040 0.15-0.35 0.40-0.70 0.40-0.60 0.15-0.25
8630 0.28-0.33 0.70-0.90 0.035 0.040 0.15-0.35 0.40-0.70 0.40-0.60 0.15-0.25




TABLE 3 Tolerances for Product Analysis for Steels Shown in Table 1 and 2A 


Element Limit, or Maximum of Specified Range. % Variation, 
Over the Maximum Limit or Under the Minimum Limit
Under min,
%
Over max.
%
Carbon to 0.15 incl 0.02 0.03
  over 0.15 to 0.40, incl 0.03 0.04
  over 0.40 to 0.55, incl 0.03 0.05
Manganese to 0.60, incl 0.03 0.03
  over 0.60 to 1.15, incl 0.04 0.04
  over 1.15 to 1.65, incl 0.05 0.05
Phosphorus ... ... 0.01
Sulfur ... ... 0.01
Slicon to 0.30, incl 0.02 0.03
  over 0.30 to 0.60 0.05 0.05
Copper ... 0.02 ...
Nickel to 1.00, incl 0.03 0.03
Chromium to 0.90, incl 0.03 0.03
  over 0.90 to 210, incl 0.05 0.05
Molybdenum to 0.20, incl 0.01 0.01
  over 0.20 to 0.40, incl 0.02 0.02


A Individual determinations may vary from the specified heat limits or ranges to the extent shown in this table, 
except that any element in a heat may not vary both above and below a specified range. 


TABLE 4 Diameter Tolerances for Type I (A.W.H.R.) Round Tubing



NOTE-Mesurements for diameter are to be taken at least 2 in.A from the ends of the tubes.

Outside Diameter Range. inA Wall Thickness Flash-in_TUbing B.C Flash Controlled to 0.010 in max Tubing C.E Flash Controlled to 0.005 in. max Tubing D.E
BwgF in.A Outside Diameter. ± Outside Diameter. ± Outside Diameter. ± Inside Diameter. ±
Tolerances. in. A, G
3/4 to 1 1/8, incl 16 to 10 0.065 to 0.134 0.0035 0.0035 0.0035 0.020
Over 1 1/8 to 2, incl 16 to 14 0.065 to 0.083 0.005 0.005 0.005 0.021
Over 1 1/8 to 2, incl 13 to 7 0.095 to 0.180 0.005 0.005 0.005 0.025
Over 1 1/8 to 2, incl 6 to 5 0.203 to 0.220 0.005 0.005 0.005 0.029
Over 1 1/8 to 2, incl 4 to 3 0.238 to 0.259 0.005 0.005 0.005 0.039
 
Over 2 to 2 1/2, incl 16 to 14 0.065 to 0.083 0.006 0.006 0.006 0.022
Over 2 to 2 1/2, incl 13 to 5 0.095 to 0.220 0.006 0.006 0.006 0.024
Over 2 to 2 1/2, incl 4 to 3 0.238 to 0.259 0.006 0.006 0.006 0.040
Over 2 1/2 to 3, incl 16 to 14 0.065 to 0.083 0.008 0.008 0.008 0.024
Over 2 1/2 to 3, incl 13 to 5 0.095 to 0.220 0.008 0.008 0.008 0.026
Over 2 1/2 to 3, incl 4 to 3 0.238 to 0.259 0.008 0.008 0.008 0.040
Over 2 1/2 to 3, incl 2 to 0.320 0.284 to 0.320 0.010 0.010 0.010 0.048
 
Over 3 to 3 1/2, incl 16 to 14 0.065 to 0.083 0.009 0.009 0.009 0.025
Over 3 to 3 1/2, incl 13 to 5 0.095 to 0.220 0.009 0.009 0.009 0.027
Over 3 to 3 1/2, incl 4 to 3 0.238 to 0.259 0.009 0.009 0.009 0.043
Over 3 to 3 1/2, incl 2 to 0.360 0.284 to 0.360 0.012 0.012 0.012 0.053
 
Over 3 to 4, incl 16 to 14 0.065 to 0.083 0.010 0.010 0.010 0.026
Over 3 to 4, incl 13 to 5 0.095 to 0.220 0.010 0.010 0.010 0.028
Over 3 to 4, incl 4 to 3 0.238 to 0.259 0.010 0.010 0.010 0.044
Over 3 to 4, incl 2 to 0.500 0.284 to 0.360 0.015 0.015 0.015 0.053
 
Over 4 to 5, incl 16 to 14 0.065 to 0.083 0.020 0.020 0.020 0.036
Over 4 to 5, incl 13 to 5 0.094 to 0.220 0.020 0.020 0.020 0.045
Over 4 to 5, incl 4 to 3 0.238 to 0.259 0.020 0.020 0.020 0.054
Over 4 to 5, incl 2 to 0.500 0.284 to 0.500 0.020 0.020 0.020 0.058
 
Over 5 to 6, incl 16 to 14 0.065 to 0.134 0.020 0.020 0.020 0.036
Over 5 to 6, incl 13 to 5 0.148 to 0.220 0.020 0.020 0.020 0.040
Over 5 to 6, incl 4 to 3 0.238 to 0.259 0.020 0.020 0.020 0.054
Over 5 to 6, incl 2 to 0.500 0.284 to 0.500 0.020 0.020 0.020 0.058
 
Over 6 to 8, incl 11 to 10 0.120 to 0.134 0.025 0.025 0.025 0.043
Over 6 to 8, incl 9 to 5 0.148 to 0.220 0.025 0.025 0.025 0.045
Over 6 to 8, incl 4 to 3 0.238 to 0.259 0.025 0.025 0.025 0.059
Over 6 to 8, incl 2 to 0.500 0.284 to 0.500 0.025 0.025 0.025 0.063



A 1 in. = 25.4 mm.



TABLE 5 Diameter Tolerances for Types 3,4,5, and 6 (S.D.H.R., S.D.C.R., M.D. and S.S.I.D) Round Tubing 

Note - Measurements for diameter are to be taken at least 2 in. from the ends of the tubes.

OD Size RangeA Wall % of OD Types 3, 4, (Sink Drawn)A,B and 5,6, (Mandrel Drawn)B,B OD in. Type 5 and 6 (Mandrel Drawn)B.C ID in.
Over Under Over Under
Up to 0.499 all 0.004 0.000 ... ...
0.500 to 1.699 all 0.005 0.000 0.000 0.005
1.700 to 2.099 all 0.006 0.000 0.000 0.006
2.100 to 2.499 all 0.007 0.000 0.000 0.007
2.500 to 2.899 all 0.008 0.000 0.000 0.008
2.900 to 3.299 all 0.009 0.000 0.000 0.09
3.300 to 3.699 all 0.010 0.000 0.000 0.010
3.700 to 4.099 all 0.011 0.000 0.000 0.011
4.100 to 4.499 all 0.012 0.000 0.000 0.012
4.500 to 4.899 all 0.013 0.000 0.000 0.013
4.900 to 5.299 all 0.014 0.000 0.000 0.014
5.300 to 5.549 all 0.015 0.000 0.000 0.015
5.500 to 5.999 Under 6 0.010 0.010 0.010 0.010
  6 and over 0.009 0.009 0.009 0.009
6.000 to 6.499 under 6 0.013 0.013 0.013 0.013
  6 and over 0.010 0.010 0.010 0.010
6.500 to 6.999 under 6 0.015 0.015 0.015 0.015
  6 and over 0.012 0.012 0.012 0.012
7.000 to 7.499 under 6 0.018 0.018 0.018 0.018
  6 and over 0.013 0.013 0.013 0.013
7.500 to 7.999 under 6 0.020 0.020 0.020 0.020
  6 and over 0.015 0.015 0.015 0.015
8.000 to 8.499 under 6 0.023 0.023 0.023 0.023
  6 and over 0.016 0.016 0.016 0.016
8.500 to 8.999 under 6 0.025 0.025 0.025 0.025
  6 and over 0.017 0.017 0.017 0.017
9.000 to 9.499 under 6 0.028 0.028 0.028 0.028
  6 and over 0.019 0.019 0.019 0.019
9.500 to 9.999 under 6 0.030 0.030 0.030 0.030
  6 and over 0.020 0.020 0.020 0.020
10.000 to 10.999 all 0.034 0.034 0.034 0.034
11.000 to 11.999 all 0.035 0.035 0.035 0.035
12.000 to 12.999 all 0.036 0.036 0.036 0.036
13.000 to 13.999 all 0.037 0.037 0.037 0.037
14.000 to 14.999 all 0.038 0.038 0.038 0.038

A Tubing. flash controlled which is further processed without mandrel to obtain tolerances closer than those shown in 
Tables 4 and 8. 

B The ovality shall be within the above tolerances except when the wall thickness is less than 3 % of the outside diameter, in such cases see 8.6.2.

C Tubing produced to outside diameter and wall thickness. or inside diameter and wall thickness, or outside diameter and inside diameter, with mandrel to obtain tolerances closer than those shown in Tables 4 and 8 and no dimensional indication of inside diameter flash.



    TABLE 6 Wall Thickness Tolerance for Type I (W.A.H.R) Round Tubing 

Wall thickness Outside Diameter, in. A
in.a Bwg b ¾to 1, incl Over 1 to 1 15/16,incl Over 1 15/16to3 ¾, incl Over3¾ to 4½,incl Over 4½ to 6,incl Over 6 to 8,incl
Wall Thickness Tolerances, in., ±
+ - + - + - + - + - + -
0.065 16 0.005 0.009 0.004 0.010 0.003 011 0.002 0.012 0.002 0.012
0.072 15 0.005 0.009 0.004 0.010 0.003 0.011 0.002 0.012 0.002 0.012
0.083 14 0.006 0.010 0.005 0.011 0.004 0.012 0.003 0.013 0.003 0.013
0.095 13 0.006 0.010 0.005 0.011 0.004 0.012 0.003 0.013 0.003 0.013
0.109 12 0.006 0.010 0.005 0.011 0.004 0.012 0.003 0.012 0.003 0.013 0.003 0.013
0.120 11 0.006 0.010 0.005 0.011 0.004 0.012 0.003 0.013 0.003 0.013 0.003 0.013
0.134 10 0.006 0.010 0.005 0.001 0.004 0.012 0.003 0.013 0.003 0.013 0.003 0.013
0.148 9 0.006 0.012 0.005 0.013 0.004 0.014 0.004 0.014 0.004 0.014
0.165 8 0.006 0.012 0.005 0.013 0.004 0.014 0.004 0.014 0.004 0.014
0.180 7 0.006 0.012 0.005 0.013 0.004 0.014 0.004 0.014 0.004 0.014
0.203 6 0.007 0.015 0.006 0.016 0.005 0.017 0.005 0.017
0.220 5 0.007 0.015 0.006 0.016 0.005 0.017 0.005 0.017
0.238 4 0.012 0.020 0.011 0.021 0.010 0.022 0.010 0.022
0.259 3 0.013 0.021 0.012 0.022 0.011 0.023 0.011 0.023
0.284 1 0.014 0.022 0.013 0.023 0.012 0.024 0.012 0.024
0.300 1 0.015 0.023 0.014 0.024 0.013 0.025 0.013 0.025
0.320 0.016 0.024 0.015 0.025 0.014 0.026 0.014 0.026
0.344 0.017 0.025 0.016 0.026 0.015 0.027 0.015 0.027
0.360 0.017 0.025 0.016 0.026 0.015 0.027 0.015 0.027
0.375 0.016 0.026 0.015 0.027 0.015 0.027
0.406 0.017 0.027 0.016 0.028 0.016 0.028
0.438 0.017 0.028 0.016 0.028 0.016 0.028
0.469 0.016 0.028 0.016 0.028
0.500 0.016 0.028 0.016 0.028



  A 1in.=25.4mm. B Briminham wire Gage   


TALBE 7 Wall Thickness Tolerances of Type 5 and 6 (M.D.and S.S.L.D.)Round Tubing


 

Wall Thickness Outside Diameter,in. A
?to1?,incl Over?to1?,incl Over1?to3¾,incl Over3¾to,incl
in. a Bwg B WAll Thickness Tolerances, in., A±
+ - + - + - + -
0.035 20 0.002 0.002 0.002 0.002 0.002 0.002
0.049 18 0.002 0.002 0.002 0.002 0.002 0.003
0.065 16 0.002 0.002 0.002 0.003 0.003 0.003 0.004 0.004
0.083 14 0.002 0.002 0.002 0.003 0.003 0.003 0.004 0.005
0.095 13 0.002 0.002 0.002 0.003 0.003 0.003 0.004 0.005
0.109 12 0.002 0.003 0.002 0.004 0.003 0.003 0.005 0.005
0.120 11 0.003 0.003 0.002 0.004 0.003 0.003 0.005 0.005
0.134 10 0.002 0.004 0.003 0.003 0.005 0.005
0.148 9 0.002 0.004 0.003 0.003 0.005 0.005
0.165 8 0.003 0.004 0.003 0.004 0.005 0.006
0.180 7 0.004 0.004 0.006 0.005 0.006 0.006
0.203 6 0.004 0.005 0.004 0.005 0.006 0.007
0.220 5 0.004 0.006 0.004 0.006 0.007 0.007
0.238 4 0.005 0.006 0.005 0.006 0.007 0.007
0.259 3 0.005 0.006 0.005 0.006 0.007 0.007
0.284 2 0.005 0.006 0.005 0.006 0.007 0.007
0.300 1 0.006 0.006 0.006 0.006 0.008 0.008
0.320 0.007 0.007 0.007 0.007 0.008 0.008
0.344 0.008 0.008 0.008 0.008 0.009 0.009
0.375 0.009 0.009 0.009 0.009
0.400 0.010 0.010 0.010 0.010
0.438 0.011 0.011 0.011 0.011
0.460 0.012 0.012 0.012 0.012
0.480 0.012 0.012 0.012 0.012
0.531 0.013 0.013 0.013 0.013
0.563 0.013 0.013 0.013 0.013
0.580 0.014 0.014 0.014 0.014
0.600 0.015 0.015 0.015 0.015
0.625 0.016 0.016 0.016 0.016
0.650 0.017 0.017 0.017 0.017


    A 1in.=25.4mm. B Birmingham Wire Gage.  


TABLE 8 Diameter Tolerances Type 2 (A.W.C.R) Round Tubing 


Noto-Masurements for diameter are at least 2 in. from the ends of the tubes. A 

Outsode Diameter Range, in. a Wall Thickness Flash-Tubing C Flash Controlled to 0.010 in. max Tubing D Flash Controlled B to 0.005 in. max Tubing
Beg E in. A Outside Dimeter, ± Outside Dimeter, ± Outside Dimeter, ± Outside Dimeter, ±
Tolerances, in. F
?to?, incl 22to16 0.028 to 0.065 0.003
Over?to?, incl 22to20 0.028 to 0.035 0.0035 0.0035 0.0035 0.013
Over?to?,incl 18 0.049 0.0035 0.0035 0.0035 0.015
Over?to?,incl 16to14 0.065 to 0.083 0.0035 0.0035 0.0035 0.019
Over¾to?,incl 13 0.095 0.0035 0.0035 0.0035 0.019
Over?to?,incl 12to11 0.109 to 0.120 0.0035 0.0035 0.0035 0.021
Over 1?to 2, incl 22to18 0.028 to 0.049 0.005 0.005 0.005 0.015
Over 1?to 2, incl 16to13 0.065 to 0.095 0.005 0.005 0.005 0.019
Over 1?to 2, incl 12to10 0.109 to 0.134 0.005 0.005 0.005 0.022
Over 2 to 2½,incl 20to18 0.035 to 0.49 0.006 0.006 0.006 0.016
Over 2 to 2½,incl 16to13 0.065 to 0.095 0.006 0.006 0.006 0.020
Over 2 to 2½,incl 12to10 0.109 to 0.134 0.006 0.006 0.006 0.023
Over2½ to 3, incl 20to18 0.035 to 0.049 0.008 0.008 0.008 0.018
Over2½ to 3, incl 16to13 0.065 to 0.049 0.008 0.008 0.008 0.022
Over2½ to 3, incl 12to10 0.109 tp 0.134 0.008 0.008 0.008 0.025
Over3 to 3½,incl 20to18 0.035 to 0.049 0.009 0.009 0.009 0.019
Over3 to 3½,incl 16to13 0.065 to 0.095 0.009 0.009 0.009 0.023
Over3 to 3½,incl 12to10 0.109 to 0.134 0.009 0.009 0.009 0.026
Over 3½ to 4, incl 20to18 0.35 to 0.049 0.010 0.010 0.010 0.020
Over 3½ to 4, incl 16to13 0.065 to 0.095 0.010 0.010 0.010 0.024
Over 3½ to 4, incl 12to10 0.109 to 0.134 0.010 0.010 0.010 0.027
Over 4 to 6,incl 16to13 0.065 to 0.095 0.020 0.020 0.020 0.034
Over 4 to 6,incl 12to10 0.109 to 0.134 0.020 0.020 0.020 0.037
Over 6 to 8,incl 14to13 0.083 to 0.095 0.025 0.025 0.025 0.039
Over 6 to 8,incl 12to10 0.109 tp 0.137 0.025 0.025 0.025 0.042


  A 1in=25.4mm.    



TALBE 9 Wall Thickness Tolerances for Type 2(A.W.C.R.)Round Tubing 


 

Wall Thickness Outside Diameter, in. A
?to?,incl Over ?to1?, incl Over 1?to 3¾, incl Over 3¾to 5, incl Over5to6, incl Over 6 to 8, incl
in. A BwgB WAll Thickness Tolerance, in., A±
+ - + - + - + - + - + -
0.028 22 0.001 0.005 0.001 0.005
0.035 20 0.002 0.005 0.001 0.005 0.001 0.005
0.049 18 0.003 0.006 0.002 0.006 0.002 0.006
0.065 16 0.005 0.007 0.004 0.007 0.004 0.007 0.004 0.007 0.004 0.007
0.083 14 0.006 0.007 0.005 0.007 0.004 0.007 0.004 0.007 0.004 0.0008 0.004 0.008
0.095 13 0.006 0.007 0.005 0.007 0.004 0.007 0.004 0.007 0.004 0.008 0.004 0.008
0.109 12 0.006 0.008 0.005 0.008 0.005 0.008 0.005 0.009 0.005 0.009
0.120 11 0.007 0.008 0.006 0.008 0.005 0.008 0.005 0.009 0.005 0.009
0.134 10 0.007 0.008 0.006 0.008 0.005 0.008 0.05 0.009 0.005 0.009


  A 1 in.=256.4mm/ B Birenimgham Wire Gage. 



  TABLE 10 Cut-Length Tolerances for Lathe Round Tubing 



Outside Diameter Size, in.A 6 in. and under 12 in. 12 in. and under 48 in 48 in. andunder 10 ft 10 ft to 24 ft incl B
3/8 tol 3 incl ±1/64 in. ±1/32 in. ±3/64 in. ±1/8 in.
Over 3 to 6, incl ±1/32 in. ±3/64 in. ±1/16 in. ± 1/8 in.
Over 6 to 9, incl ±1/16 in. ±1/16 in. ±1/8 in. ±1/8 in.
Over 9 to 12, incl ±3/32 in. ±3/32 in. ±1/8 in. ±1/8 in.

A 1 in.=25.4mm. B For each additional 10 ft or franction thereof over 24 ft,
an additional alowance should be made of plus orminus 1/16 in.  



TAble 11 Tolerance (inch) for squarenesess of Cut (Either End ) When Specified for Round Tubing A.B 

Length of Tube, ft C Outside Diameter, in.D
Under 1 1 to 2, incl Over 2 to, incl Over 3 to 4, incl Over 4
Under 0.006 0.008 0.010 0.015 0.020
1 to 3, incl 0.008 0.010 .0015 0.020 0.030
Over 3 to 6, incl 0.010 0.015 0.020 0.025 0.040
Over 6 to 9, incl 0.015 0.020 0.025 0.030 0.040

A Actual aquareness normal to length of tube, not parallelness of both ends. 
B Value given are "go" value of feeler gage. "no go" value is 0.001 in. 
Greater in each case. C 1 ft=0.3m D 1 in.=25.4mm.  



TABLE 12 Tolrances, Outside Dimensions A Square and Rectangular Tubing   


Largest Nominal Outside Dimension, in. B WAll Thickness, in. B Outside Tolerance at all Sides at Comers ±in. B
3/16 to 5/8, incl 0.020 to 0.083, incl 0.004
Over 5/8 to 1 1/8 ,incl 0.025 to 0.156, incl 0.005
Over 1 1/8 to 1½, incl 0.025 to 0.192, incl 0.006
Over 1½ to 2,incl 0.032 to 0.192, incl 0.008
Over 2 to 3, incl 0.035 to 0.259, incl 0.010
Over 3 to 4, incl 0.049 to 0.259, incl 0.020
Over 4 to 5, incl 0.065 to 0.259, incl 0.020
ver 6 to 8,incl 0.185 to 0.259, incl 0.025



A Measured at corners at least 2 in. from the cut end of the tubing. 
Convexity and concavity: Tubes having two parallel sides are also measured in the center of the flat sides for convxity. 
This tolerance applies to the specific size determined st the comers, and is measured on the following basic: 

Largest Nominal Outside Dimension, in. Tolerance , ±in.
2½ and under 0.010
Over 2½ to 4 0.015
Over 4 to 8 0.025


B 1 in.=25.4 mm.  



TABLE 13 Radii of Comers of Electric-Resistancce-Welded Square and Rectangular Tubing A   


Squares and Rectangles Made From Tubes of the Follwing Diameter Ranges, in. B Wall Thickness in Bwg and in. B Radius Tolerances, in. C
½ to 1, incl 22(0.028) 1/32 to 1/16
½ to 2½, incl 20(0.035) 1/32 to 1/16
½ to 4, incl 18(0.049) 3/64 to 5/64
½ to 4?, incl 16(0.035) 1/16 to 7/64
¾ to 4?, incl 14(0.083) 5/64 to 1/8
Over 41/8 to 6, incl 14(0.083) 3/16 to 5/16
1 to 4?, incl 13(0.059) 3/32 to 5/32
Over 4? to 6, incl 13(0.095) 3/16 to 5/16
1¼ to 4, incl 12(0.109) 1/8 to 13/64
Over 4 to 6, incl 12(0.109) 3/16 to 5/16
1¼ to 4, incl 11(0.120) 1/8 to 7/32
Over 4 to 6, incl 11(0.120) 7/32to 7/16
2 to 4, incl 10(0.134) 5/32 to 9/32
Over a to 6,incl 10(0.134) 7/32 to 7/16
2 to 4, incl 9(0.148) 3/16 to 5/16
Over 4 to 8, incl 9(0.148) 7/32 to 7/16
2 To 8, incl 8(0.165) 1/4 to 1/2
2 to 8, incl 7(0.180) 1/4 to 1/2
2½ to 4, incl 6(0.203) 5/16 to 9/16
Over 4 to 8, incl 6(0.203) 5/16 to 9/16
2½ to 8,incl 5(0.220) 3/8 to 3/8
2½ to 8, incl 4(0.238) 3/8 to 5/8 3/8 to 5/8
2½ to 8, incl 3(0.259) 3/8 to 5/8

 



  A This table eatablishes a stadard radius. The purchaser and producer may negotiate special radii. 
  Slight radius flattening is more promounced in heavier wall tubing. B 1 in.=25mm.
  C These radius tolerances apply to grades of steel covered in Table 1. 
  The purchaser and producer may negotiate apply to grade of steel.    



TALBE 14 Length Tolerances-Square and Rectangular Tubing

 

    

Lengths, ft A Tolerances, in. B
1 to 3, incl ±1/16
Over 3 to 12, incl ±3/32
Over 12 to 20,incl ±1/8
Over 20 to 30, incl ±3/16
Over 30 to 40, inclOver 30 to 40, incl ±3/8

 

A 1 ft = 0.3 m. B 1 in.=25.4 mm.   


TABLE 15 Twist Tolerances Electric-Resistance-Welded for Square and Rectangular-Mechanical Tubing


 

Largest Dimension, in. A Twist Tolerance in 3 ft B, in.A
½ and under 0.032
Over ½ to 1½, incl 0.050
Over 1½ to 2½, incl 0.062
Over 2½ to 4, incl 0.075
Over 4 to 6,incl 0.087
Over 6 to 8, incl 0.100


A 1 in.=25.4 mm. B 1 ft =0.3 m.  


TABLE 16 Minimum Inside Diameter Stock Allowance on Diameter A 
for Removal of inside-Surface Imperfecions by Honing Operation (Mandrel-Drawn Tubing)



Outside Diameter, in. B Wall Thickness, in. B
0.065 and under Over 0.065 to 0.125 incl Over 0.125 to 0.180, incl Over 0.180 to 0.230, incl Over 0.230 to 0.360, incl Over 0.360 to 0.460, incl Over 0.460 to 0.563, incl Over 0.563
Up to and incl 1½ 0.010 0.011 0.013 0.015 0.018      
Over 1½ to 3,incl 0.010 0.012 0.014 0.016 0.018 0.021 0.023  
Over 3 to 4 incl 0.011 0.013 0.015 0.017 0.019 0.021 0.023 0.025
Over 4 to 4¾incl   0.014 0.016 0.018 0.020 0.022 0.024 0.026
Over 4¾ to 6, incl   0.015 0.017 0.019 0.021 0.023 0.025 0.027
Over 6 to 8, incl   0.016 0.017 0.020 0.022 0.024 0.026 0.028
Over 8 to10½, incl       0.021 0.023 0.025 0.027 0.029
Over 10½ to 12½incl       0.022 0.024 0.026 0.028 0.030
Over 12½ to 14 incl       0.024 0.025 0.027 0.029 0.031
Over 14 to 15 incl       0.025 0.026 0.028 0.030 0.032



  A If a specific size desired, these allowances plus nomal size tolerances must be considered in 
calculationg size to be ordered.

B 1 in.=25.4 mm. 

TABLE 17 Minimum Outside Diameter Stock Allowance on Diameter for Removel of 
Outside-Surface Imprefections bym centerless Griding (Mandrel-Drawn Tubing)
 


Outside Diameter, in. B Tubing Wall Thickness, in. B
Up to 0.125, incl Over 0.125 to 0.180, incl Ocer 0.180 to 0.230, incl Over 0.230 to 0.360, incl Over 0.360 to 0.460, incl Over 0.460
Up to 3, incl 0.012 0.014 0.016 0.020 0.024 0.026
Over 3 too 4¾, incl 0.016 0.018 0.020 0.022 0.024 0.026
Over 4¾ to 6, incl 0.018 0.020 0.022 0.024 0.026 0.028
Over 6 to 7, incl 0.020 0.022 0.024 0.026 0.028 0.030
Over 7 to 8, incl     0.026 0.027 0.029 0.031
Over 8 to 10½,incl     0.027 0.028 0.030 .032
Over 10½ to 12½, incl     0.028 0.030 0.032 0.034
Over 12½ to 14 incl     0.03 0.032 0.034 0.036
Over 14     0.033 0.035 0.036 0.037


A If a specific size is desired, these allowance plus normal size tolerances must be 
considered in calculating size to be order.

B 1 in. =25.4mm. 


  
TABLE 18 Minimum Diameter Stock Allowance for Outside Diameter and 
Inside Diameter for Removal of Imperfections by Machining (Mandrel-Drawn Tubing) A



Note-Camber-For Every foot or fraction tereof oner one foot of length, add 0.010 in. B for camber. 

Outside Diameter, in. B Wall Thickness, in. B
Up to 0.187 0.187 to 0.230 incl Over 0.230 to 0.360, incl, Over 0.360 to 0.460, incl Over 0.460
Up to 1½ incl 0.015 0.020 0.025    
Over 1½ to 3 incl 0.020 0.025 0.030 0.030 0.035
Over 3 to 4¾incl 0.025 0.030 0.035 0.035 0.040
Over 4¾ to 6 incl 0.030 0.035 0.040 0.040 0.045
Over6 to7 incl 0.035 0.040 0.045 0.045 0.050
Over 7 to 8 incl   0.045 0.048 0.048 0.053
Over 8 to 10 ½incl   0.048 0.050 0.050 0.055
Over 10 to½ 15 incl   0.050 0.055 0.055 0.060


A If a specific size desired, thise allowances plus nomal size tolerances must be considered 
in claculationg size to be order.

B 1 in.=25.4 mm.   


TABLE 19 Maximum Average Microinch Readings on Inside Surface (Special Smooth Inside Diameter Tubing)
 


Outside Diameter, in.A Tubing Wall Thickness, in.A
0.065 and Under Over 0.065 to 0.150, incl Over 0.150 to 0.187, incl Over 0.187 to 0.255, incl 0.255 to 0.312, incl
1 to 2½,incl 40 45 50 55 70
Over 2½ to 4½,incl 40 50 60 70 80
Over 4½ to 5½, incl   55 70 80 90
Over 5 ½to 7,incl   55 70 80 90


A 1 in.=25.4mm  


TABLE 20 Allowance for Surface Imperfections on inside Diameters of Special Smooth Finish Tubes A


Outside Diameter Size, in .A Wall Thickness, in. B Wal Depth Allowance for Inside Diameter Surface Imperfections, in. B
Scores Pits
Up to 2, incl½ 0.065 to 0.109, incl 0.001 0.0015
Over 0.109 to 0.250, incl 0.001 0.002
Over 0.250 to 0.321, incl 0.001 0.0025
Over 2½to 5½, incl 0.083 to 0.125, incl 0.0015 0.0025
Over 0..125 to 0.312, incl 0.0015 0.003
Over 0.187 to 0.312, incl 0.002 0.004
Over 5 to ½7, incl 0.125 to 0.187, incl 0.0025 0.005
Over 0.187 to 0.312, incl 0.003 0.006


  A If a specific size is desired, These allowance plus normal size tolerances must be
considered calculating size be ordered.

B 1in. = 25.4mm. 


TALBE 21 Hardness Limits and Tensile Properties for Round Tubing
 


Note 1- These values are on normal mill street relieving temperatures. 
For particular applisations, properties may be ajusted by nagotiation between puechaser and producer.
Note 2-For longitudinal strip tets, the width of the gage section shall be 1 in.(25.4mm) and a deduction of 
0.5 percentage points from the basic minimum elongation for each 1/32 in. (0.8mm) decrease in wall thickness 
under 5/16 in. (7.9mm) in wall thickness shall permitted.   

Yield Strength, kis (MPa), min Ultimate Strength, kis (MPa), min Elongation in 2 in. or 50mm, %, min RB min RBmax
As-Welded Tubing
1008 30(207) 50 15 50
1010 32(221) 45(310) 15 55
1015 35(241) 48(331) 15 58
1020 38(262) 52(359) 12 62
1021 40(276) 54(327) 12 62
1025 40(276) 56(386) 12 65
1026 45(310) 62(427) 12 68
1030 45(310) 65(427) 10 70
1035 50(345) 66(455) 10 75
1040 50(345) 66(645) 10 75
1340 55(379) 72(496) 10 80
1524 50(345) 66(455) 100 75
4130 55(379) 72(496) 10 80
4140 70(485) 90(621) 10 85
Normalized Tubing
1008 23(159) 38(262) 30 65
1010 25(172) 40(276) 30 65
1015 30(207) 45(310) 30 70
1020 35(241) 50(345) 25 75
1021 35(241) 50(345) 25 78
1025 37(255) 55(379) 25 80
1026 40(276) 60(414) 25 80
1030 40(276) 60(414) 25 85
1035 45(310) 65(448) 20 88
1040 45(310) 65(448) 20 90
1340 50(345) 70(483) 20 100
1524 45(310) 65(448) 20 88
4130 50(345) 70(483) 20 100
4140 65(448) 90(621) 20 105





  TABLE 21 Continued   


Yield Strength, kis(MPa), min Ultimate Strength kis (MPa), min Elongation in 2 in. or 50 mm, % min RB min RB max
Sink-Drawn Tubing
1008 38(262) 48(331) 8 65  
1010 40(276) 50(345) 8 65  
1015 45(310) 55(379) 8 67  
1020 50(345) 60(414) 8 70  
1021 52(359) 62(428) 7 70  
1025 55(379) 65(448) 7 72  
1026 55(379) 70(483) 7 72  
1030 62(427) 70(483) 7 78  
1035 70(483) 80(552) 7 82  
Mandrel-Drawn Tubing
1008 50(345) 60(414) 5 73  
1010 50(345) 60(414) 5 73  
1015 55(379) 65(448) 5 77  
1020 60(414) 70(483) 5 80  
1021 65(427) 72(496) 5 80  
1025 65(448) 75(517) 5 82  
1026 70(483) 80(552) 5 85  
1030 75(517) 85(586) 5 87  
1035 80(552) 90(621) 5 90  
1040 80(550) 90(621) 5 90  
1340 85(586) 95(655) 5 90  
1524 80(552) 90(621) 5 90  
4130 85(586) 95(655) 5 90  
4140 100 (690) 110(758) 5 90  
Mandrel-Drawn Street-Relieved Tubing
1008 45(310) 55(379) 12 68  
1010 45(310) 55(379) 12 68  
1015 50(345) 60(414) 12 72  
1020 55(379) 65(448) 10 75  
1021 58(400) 68(469) 10 75  
1025 60(414) 70(483) 10 77  
1026 65(448) 75(517) 10 80  
1030 70(483) 80(552) 10 81  
1035 75(517) 85(586) 10 85  
1040 75(517) 85(586) 10 85  
1340 80(552) 90(621) 10 87  
1524 75(517) 85(586) 10 85  
4130 80(552) 90(621) 10 87  
4140 95(655) 105(724) 10 90  

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