Borosilicate Tubing and Rod: Sizes and Tolerances

Listed below are the nominal sizes and tolerances for American standard sizes of tubing and rod, both Pyrex 7740 and Kimble KG-33, and European-made Schott Duran and Kavalier Simax. They are functionally equivalent for our purposes. They are "33-expansion" glasses.

You will note that American standard and special wall tubing is all referenced in metric sizes, and medium and heavy wall is referenced in English measure, for some obscure historical reason. In this listing we have left off the fractional English equivalents for reasons of space. If the OD is listed as a non-integral metric measure, it is generally a fraction in inches; 15.9 mm is 5/8", 63.5 mm is 2-1/2", etc. After many years of working glass and dealing with customers who like a variety of measuring systems, we have become pretty much ambimetric. We do use some Duran tubing made in Germany, and Simax tubing from the Czech Republic, which is all metric; the sizes and tolerances are shown here.

tubing

A word about tolerances: Corning and Kimble specify the diameters of their tubing as being in tolerance at each end of a four foot length of tubing; what might happen in between is irrelevant to them. Generally it's a pretty good bet that it's all in spec. Usually tubing is reasonably, but not perfectly round. If you need perfection, precision bore tubing is available, but at relatively high expense.

Our page of tubing end finishes shows some simple examples of what we can do to process the ends, including firepolishing, lapping, and tooling to specific form configurations.

See our page for the standard sizes of European made tubing.

The tubing designations are:

  • Standard wall - SW
  • Medium wall - MW
  • Heavy wall - HW
  • Special wall - SpW
  • Capillary - Cap

Pyrex Tubing Sizes; 2 - 8 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID
 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

2

0.5

2.2

1.9

0.079

0.085

0.073

1

1.4

0.7

0.039

0.053

0.026

S.W.

3

0.6

3.2

2.8

0.118

0.126

0.11

1.8

2.2

1.4

0.071

0.087

0.055

S.W.

4

0.8

4.3

3.7

0.157

0.169

0.146

2.4

2.9

1.9

0.094

0.114

0.075

S.W.

5

0.8

5.3

4.7

0.197

0.209

0.185

3.4

3.9

2.9

0.134

0.154

0.114

Cap

5.5

 

5.9

5.1

0.217

0.232

0.201

0.5

0.6

0.4

0.02

0.024

0.016

S.W.

6

1

6.3

5.7

0.236

0.248

0.224

4

4.5

3.5

0.157

0.177

0.138

M.W.

6.35

1.2

6.7

6.1

0.25

0.262

0.238

4

4.5

3.5

0.156

0.175

0.136

Cap

6.5

 

6.9

6.1

0.256

0.272

0.24

1

1.2

0.8

0.039

0.047

0.031

Cap

6.5

 

6.9

6.1

0.256

0.272

0.24

1.25

1.5

1.1

0.049

0.057

0.041

S.W.

7

1

7.3

6.7

0.276

0.287

0.264

5

5.5

4.5

0.197

0.217

0.177

Cap

7

 

7.4

6.6

0.276

0.291

0.26

2.75

3

2.6

0.108

0.116

0.1

Cap

7.5

 

7.9

7.1

0.295

0.311

0.28

3.38

3.7

3.1

0.133

0.145

0.121

Cap

7.5

 

7.9

7.1

0.295

0.311

0.28

1.5

1.7

1.3

0.059

0.067

0.051

S.W.

8

1

8.3

7.7

0.315

0.327

0.303

6

6.5

5.5

0.236

0.256

0.217

SP.W

8

1.5

8.3

7.7

0.315

0.327

0.303

5

5.7

4.3

0.197

0.224

0.169

SP.W

8

2

8.3

7.7

0.315

0.327

0.303

4

4.7

3.3

0.157

0.185

0.13

Cap

8

 

8.4

7.6

0.315

0.331

0.299

1.75

2

1.6

0.069

0.077

0.061

Pyrex Tubing Sizes; 9-13 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID
 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

9

1

9.3

8.7

0.354

0.366

0.343

7

7.5

6.5

0.276

0.295

0.256

SP.W

9

1.5

9.3

8.7

0.354

0.366

0.343

6

6.7

5.3

0.236

0.264

0.209

SP.W

9

2

9.3

8.7

0.354

0.366

0.343

5

5.7

4.3

0.197

0.224

0.169

Cap

9

 

9.4

8.6

0.354

0.37

0.339

2.38

2.6

2.2

0.094

0.102

0.086

H.W.

9.5

2

9.8

9.2

0.374

0.386

0.362

5.5

6.2

4.8

0.217

0.244

0.189

S.W.

10

1

10.3

9.7

0.394

0.406

0.382

8

8.5

7.5

0.315

0.335

0.295

SP.W

10

1.5

10.3

9.7

0.394

0.406

0.382

7

7.7

6.3

0.276

0.303

0.248

SP.W

10

2

10.3

9.7

0.394

0.406

0.382

6

6.7

5.3

0.236

0.264

0.209

S.W.

11

1

11.3

10.7

0.433

0.445

0.421

9

9.5

8.5

0.354

0.374

0.335

SP.W

11

1.5

11.3

10.7

0.433

0.445

0.421

8

8.7

7.3

0.315

0.343

0.287

SP.W

11

2

11.3

10.7

0.433

0.445

0.421

7

7.7

6.3

0.276

0.303

0.248

S.W.

12

1

12.3

11.7

0.472

0.484

0.461

10

10.5

9.5

0.394

0.413

0.374

M.W.

12.7

1.6

13

12.4

0.5

0.512

0.488

9.5

10.2

8.8

0.374

0.402

0.346

H.W.

12.7

2.4

13

12.4

0.5

0.512

0.488

7.9

8.6

7.2

0.311

0.339

0.283

S.W.

13

1.2

13.3

12.7

0.512

0.524

0.5

10.6

11.1

10.1

0.417

0.437

0.398

Pyrex Tubing Sizes; 14-22.2 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID
 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

14

1.2

14.3

13.7

0.551

0.563

0.539

11.6

12.1

11.1

0.457

0.476

0.437

SP.W

14

1.6

14.3

13.7

0.551

0.563

0.539

10.8

11.5

10.1

0.425

0.453

0.398

S.W.

15

1.2

15.3

14.7

0.591

0.602

0.579

12.6

13.1

12.1

0.496

0.516

0.476

M.W.

15.9

1.6

16.2

15.6

0.626

0.638

0.614

12.7

13.4

12

0.5

0.528

0.472

H.W.

15.9

2.4

16.2

15.6

0.626

0.638

0.614

11.1

11.8

10.4

0.437

0.465

0.409

S.W.

16

1.2

16.3

15.7

0.63

0.642

0.618

13.6

14.1

13.1

0.535

0.555

0.516

S.W.

17

1.2

17.3

16.7

0.669

0.681

0.657

14.6

15.1

14.1

0.575

0.594

0.555

S.W.

18

1.2

18.3

17.7

0.709

0.72

0.697

15.6

16.1

15.1

0.614

0.634

0.594

S.W.

19

1.2

19.3

18.7

0.748

0.76

0.736

16.6

17.1

16.1

0.654

0.673

0.634

M.W.

19

1.6

19.3

18.7

0.748

0.76

0.736

15.8

16.5

15.1

0.622

0.65

0.594

SP.W

19

2.3

19.3

18.7

0.748

0.76

0.736

14.5

15.2

13.8

0.571

0.598

0.543

H.W.

19

3.2

19.3

18.7

0.748

0.76

0.736

12.6

13.7

11.5

0.496

0.539

0.453

S.W.

20

1.2

20.4

19.6

0.787

0.803

0.772

17.6

18.2

17

0.693

0.717

0.669

S.W.

22

1.5

22.4

21.6

0.866

0.882

0.85

19

19.8

18.2

0.748

0.78

0.717

SP.W

22

2.3

22.4

21.6

0.866

0.882

0.85

17.5

18.5

16.5

0.689

0.728

0.65

H.W.

22.2

3.2

22.6

21.8

0.874

0.89

0.858

15.8

17

14.6

0.622

0.669

0.575

Pyrex Tubing Sizes; 25-54 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID
 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

25

1.5

25.4

24.6

0.984

1

0.969

22

22.8

21.2

0.866

0.898

0.835

M.W.

25.4

2.4

25.8

25

1

1.016

0.984

20.6

21.6

19.6

0.811

0.85

0.772

H.W.

25.4

4

25.8

25

1

1.016

0.984

17.4

18.6

16.2

0.685

0.732

0.638

S.W.

28

1.5

28.4

27.6

1.102

1.118

1.087

25

25.8

24.2

0.984

1.016

0.953

S.W.

30

1.8

30.7

29.3

1.181

1.209

1.154

26.4

27.5

25.3

1.039

1.083

0.996

M.W.

31.7

2.4

32.4

31

1.248

1.276

1.22

26.9

28.2

25.6

1.059

1.11

1.008

H.W.

31.7

4

32.4

31

1.248

1.276

1.22

23.7

25.2

22.2

0.933

0.992

0.874

S.W.

32

1.8

32.7

31.3

1.26

1.287

1.232

28.4

29.5

27.3

1.118

1.161

1.075

S.W.

35

2

35.7

34.3

1.378

1.406

1.35

31

32.1

29.9

1.22

1.264

1.177

S.W.

38

2

38.7

37.3

1.496

1.524

1.469

34

35.1

32.9

1.339

1.382

1.295

M.W.

38.1

2.4

38.8

37.4

1.5

1.528

1.472

33.3

34.6

32

1.311

1.362

1.26

H.W.

38.1

4

38.8

37.4

1.5

1.528

1.472

30.1

31.6

28.6

1.185

1.244

1.126

S.W.

41

2

41.9

40.1

1.614

1.65

1.579

37

38.3

35.7

1.457

1.508

1.406

M.W.

44.4

2.4

45.4

43.4

1.748

1.787

1.709

39.6

41.2

38

1.559

1.622

1.496

H.W.

44.4

4

45.4

43.4

1.748

1.787

1.709

36.4

38.2

34.6

1.433

1.504

1.362

S.W.

45

2

46

44

1.772

1.811

1.732

41

42.4

39.6

1.614

1.669

1.559

S.W.

48

2

49

47

1.89

1.929

1.85

44

45.4

42.6

1.732

1.787

1.677

M.W.

50.8

3.2

51.8

49.8

2

2.039

1.961

44.4

46

42.8

1.748

1.811

1.685

H.W.

50.8

4.8

51.8

49.8

2

2.039

1.961

41.2

43.2

39.2

1.622

1.701

1.543

S.W.

51

2

52

50

2.008

2.047

1.969

47

48.4

45.6

1.85

1.906

1.795

S.W.

54

2.4

55

53

2.126

2.165

2.087

49.2

50.8

47.6

1.937

2

1.874

Pyrex Tubing Sizes; 57-95 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

 

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID

 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

57

2.4

58

56

2.244

2.283

2.205

52.2

53.8

50.6

2.055

2.118

1.992

M.W.

57.1

3.2

58.1

56.1

2.248

2.287

2.209

50.7

52.5

48.9

1.996

2.067

1.925

H.W.

57.1

4.8

58.1

56.1

2.248

2.287

2.209

47.5

49.5

45.5

1.87

1.949

1.791

S.W.

60

2.4

61.1

58.9

2.362

2.406

2.319

55.2

56.9

53.5

2.173

2.24

2.106

M.W.

63.5

3.2

64.9

62.1

2.5

2.555

2.445

57.1

59.3

54.9

2.248

2.335

2.161

H.W.

63.5

4.8

65

62

2.5

2.559

2.441

53.9

56.4

51.4

2.122

2.22

2.024

S.W.

64

2.4

65.2

62.8

2.52

2.567

2.472

59.2

61

57.4

2.331

2.402

2.26

M.W.

69.8

3.2

71.3

68.3

2.748

2.807

2.689

63.4

65.7

61.1

2.496

2.587

2.406

H.W.

69.8

4.8

71.3

68.3

2.748

2.807

2.689

60.2

62.7

57.7

2.37

2.469

2.272

S.W.

70

2.4

71.2

68.8

2.756

2.803

2.709

65.2

67

63.4

2.567

2.638

2.496

S.W.

75

2.4

76.3

73.7

2.953

3.004

2.902

70.2

72.1

68.3

2.764

2.839

2.689

M.W.

76.2

3.2

77.7

74.7

3

3.059

2.941

69.8

72.1

67.5

2.748

2.839

2.657

H.W.

76.2

4.8

77.7

74.7

3

3.059

2.941

66.6

69.1

64.1

2.622

2.72

2.524

S.W.

80

2.4

81.3

78.7

3.15

3.201

3.098

75.2

77.1

73.3

2.961

3.035

2.886

M.W.

82.5

3.2

84.2

80.8

3.248

3.315

3.181

76.1

78.6

73.6

2.996

3.094

2.898

H.W.

82.5

4.8

84.3

80.7

3.248

3.319

3.177

72.9

75.7

70.1

2.87

2.98

2.76

S.W.

85

2.4

86.3

83.7

3.346

3.398

3.295

80.2

82.1

78.3

3.157

3.232

3.083

M.W.

88.9

3.2

90.7

87.1

3.5

3.571

3.429

82.5

85.1

79.9

3.248

3.35

3.146

H.W.

88.9

4.8

90.7

87.1

3.5

3.571

3.429

79.3

82.1

76.5

3.122

3.232

3.012

S.W.

90

2.4

91.3

88.7

3.543

3.594

3.492

85.2

87.1

83.3

3.354

3.429

3.28

S.W.

95

2.4

96.4

93.6

3.74

3.795

3.685

90.2

92.2

88.2

3.551

3.63

3.472

Pyrex Tubing Sizes; 100-180 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

 

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID

 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

100

2.4

101.4

98.6

3.937

3.992

3.882

95.2

97.2

93.2

3.748

3.827

3.669

M.W.

101.6

4.8

103.4

99.8

4

4.071

3.929

92

94.8

89.2

3.622

3.732

3.512

H.W.

101.6

6.4

103.4

99.8

4

4.071

3.929

88.8

92

85.6

3.496

3.622

3.37

S.W.

110

2.6

111.8

108.2

4.331

4.402

4.26

104.8

107.2

102.4

4.126

4.22

4.031

M.W.

114.3

4.8

116.1

112.5

4.5

4.571

4.429

104.7

107.5

101.9

4.122

4.232

4.012

H.W.

114.3

6.4

116.1

112.5

4.5

4.571

4.429

101.5

104.7

98.3

3.996

4.122

3.87

S.W.

120

3

121.8

118.2

4.724

4.795

4.654

114

116.4

111.6

4.488

4.583

4.394

S.W.

125

3

126.8

123.2

4.921

4.992

4.85

119

121.4

116.6

4.685

4.78

4.591

H.W.

127

6.4

128.8

125.2

5

5.071

4.929

114.2

117.4

111

4.496

4.622

4.37

S.W.

130

3

131.8

128.2

5.118

5.189

5.047

124

126.4

121.6

4.882

4.976

4.787

H.W.

139.7

6.4

141.7

137.7

5.5

5.579

5.421

126.9

130.3

123.5

4.996

5.13

4.862

S.W.

140

3.5

142

138

5.512

5.591

5.433

133

135.8

130.2

5.236

5.346

5.126

S.W.

150

3.5

152

148

5.906

5.984

5.827

143

145.8

140.2

5.63

5.74

5.52

H.W.

152.4

7.9

154.4

150.4

6

6.079

5.921

136.6

140.4

132.8

5.378

5.528

5.228

H.W.

165.1

7.9

167.1

163.1

6.5

6.579

6.421

149.3

153.1

145.5

5.878

6.028

5.728

H.W.

177.8

9.5

180

175.6

7

7.087

6.913

158.8

163.2

154.4

6.252

6.425

6.079

S.W.

178

3.5

180.2

175.8

7.008

7.094

6.921

171

174

168

6.732

6.85

6.614

S.W.

180

3.5

182.2

177.8

7.087

7.173

7

173

176

170

6.811

6.929

6.693

M.W.

180

6

182.2

177.8

7.087

7.173

7

168

171.4

164.6

6.614

6.748

6.48

Pyrex Tubing; 190-250 mm

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

 

Designation
OD
Wall
Max OD
Min OD
OD
Max OD
Min OD
ID
Max ID
Min ID
ID
Max ID
Min ID

 

mm

mm

mm

mm

in.

in.

in.

mm

mm

mm

in.

in.

in.

S.W.

190

4

192.6

187.4

7.48

7.583

7.378

182

185.4

178.6

7.165

7.299

7.031

M.W.

190

7

192.5

187.5

7.48

7.579

7.382

176

180.1

171.9

6.929

7.091

6.768

S.W.

200

5

202.6

197.4

7.874

7.976

7.772

190

193.6

186.4

7.48

7.622

7.339

M.W.

200

7

202.6

197.4

7.874

7.976

7.772

186

190.2

181.8

7.323

7.488

7.157

S.W.

210

5

212.6

207.4

8.268

8.37

8.165

200

203.6

196.4

7.874

8.016

7.732

M.W.

210

7

212.6

207.4

8.268

8.37

8.165

196

200.2

191.8

7.717

7.882

7.551

S.W.

220

5.5

222.8

217.2

8.661

8.772

8.551

209

213

205

8.228

8.386

8.071

M.W.

220

7

222.8

217.2

8.661

8.772

8.551

206

210.4

201.6

8.11

8.283

7.937

M.W.

230

7

232.8

227.2

9.055

9.165

8.945

216

220.4

211.6

8.504

8.677

8.331

M.W.

240

7

243

237

9.449

9.567

9.331

226

230.6

221.4

8.898

9.079

8.717

M.W.

250

7

253.1

246.9

9.843

9.965

9.72

236

240.7

231.3

9.291

9.476

9.106

Pyrex Rod

Tubing diam in mm: 2-8 | 9-13 | 14-22.2 | 25-54 | 57-95 | 100-180 | 190-250 | Rod | Top

 

OD
Max OD
Min OD
OD
Max OD
Min OD

 

mm
mm
mm
inches
inches
inches

Rod

2
2.4
1.6
0.079
0.094
0.063

Rod

3
3.4
2.6
0.118
0.134
0.102

Rod

4
4.4
3.6
0.157
0.173
0.142

Rod

5
5.4
4.6
0.197
0.213
0.181

Rod

6
6.4
5.6
0.236
0.252
0.22

Rod

7
7.4
6.6
0.276
0.291
0.26

Rod

8
8.4
7.6
0.315
0.331
0.299

Rod

9
9.4
8.6
0.354
0.37
0.339

Rod

10
10.4
9.6
0.394
0.409
0.378

Rod

11
11.4
10.6
0.433
0.449
0.417

Rod

12.7
13.2
12.2
0.5
0.52
0.48

Rod

15.9
16.5
15.3
0.626
0.65
0.602

Rod

19
19.8
18.2
0.748
0.78
0.717

Rod

25.4
26.4
24.4
1
1.039
0.961

Rod

31.7
33
30.4
1.248
1.299
1.197

Rod

38.1
39.8
36.4
1.5
1.567
1.433

 

1488