BS 1806 [1989]

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BRITISH STANDARD BS 1806:1989Incorporating Amendment No. 1

Specification for

Dimensions of toroidal

sealing rings

(“O”-rings) and their

housings (inch series)

UDC 62 – 762.84:678.074(083.3)

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7/26/2019 BS 1806 [1989]


BS 1806:1989

This British Standard, havingbeen prepared under thedirection of the Machineryand Components StandardsPolicy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on28 April 1989

© BSI 07-1999

First published December 1951

First revision December 1962

Second revision April 1989

The following BSI referencesrelate to the work on thisstandard:

Committee reference MCE/11

Draft for comment 87/72482 DC

ISBN 0 580 17221 X

Committees responsible for thisBritish Standard

The preparation of this British Standard was entrusted by the Machinery and

Components Standards Policy Committee (MCE/-) to Technical CommitteeMCE/11, upon which the following bodies were represented:

British Compressed Air Society

British Fluid Power Association

British Hydromechanics Research Association

British Industrial Truck Association

British Rubber Manufacturers’ Association

Engineering Equipment and Materials Users’ Association

Ministry of Defence

Society of British Aerospace Companies Limited

Society of Motor Manufacturers and Traders Limited

Amendments issued since publication

Amd. No. Date of issue Comments

6953 May 1992 Indicated by a sideline in the margin

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BS 1806:1989

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Contents

Page

Committees responsible Inside front cover

Foreword ii1 Scope 1

2 “O”-rings 1

3 Housing grooves 1

Figure 1 — “O”-ring 13

Figure 2 — Housing grooves 13

Figure 3 — Face sealing 14

Figure 4 — Triangular housings 15

Table 1 — Dimensions of “O”-rings of nominal crosssection 1/16 in and less 2

Table 2 — Dimensions of “O”-rings of nominal cross section 3/32 in 3

Table 3 — Dimensions of “O”-rings of nominal cross section 1/8 in 5Table 4 — Dimensions of “O”-rings of nominal cross section 3/16 in 8

Table 5 — Dimensions of “O”-rings of nominal cross section 1/4 in 11

Table 6 — Dimensions of housings for diametral sealing 14

Table 7 — Dimensions of housings for static face sealing 15

Table 8 — Dimensions of triangular housings for static face sealings 15

Publications referred to Inside back cover

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ii © BSI 07-1999

Foreword

This revised British Standard has been prepared under the direction of theMachinery and Components Standards Policy Committee. It revises andsupersedes BS 1806:1962 which is now withdrawn.

In view of the continued strong demand for an inch series of “O”-rings it has beendecided to revise this standard rather than prepare an extensive amendment ofthe 1962 edition. Inch dimensions have been retained throughout and metricconversions should be based on BS 350.

In this revision the range of “O”-rings has been extended to embrace all the sealslisted in British Standard M 48 and also a majority of the sizes listed in SAE Aerospace Standard AS 568A:19841). The dimensional tolerances on the internaldiameter B have in many cases also been increased to reflect currentmanufacturing practice.

It is stressed that the dimensions specified in this standard, although providingthe necessary basis for standardization in the manufacture and application of“O”-rings, should not be regarded as providing all the information required for

design purposes. Attention is drawn to the desirability of consultation betweenusers and manufacturers of “O”-rings, when a particular application of this typeof seal is being considered.

A British Standard does not purport to include all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,pages 1 to 16, an inside back cover and a back cover.

This standard has been updated (see copyright date) and may have hadamendments incorporated. This will be indicated in the amendment table on

the inside front cover.

1) Aerospace size standard for “O”-rings, published by the Society of Automotive Engineers,

Inc., 400 Commonwealth Drive, Warrendale, PA 15096, USA.

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BS 1806:1989

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1 Scope

This British Standard specifies the dimensions of

elastomeric “O”-rings which are toroidal in shapeand are used for sealing components against ingressor egress of fluids under dynamic and staticconditions.

The standard also specifies the shape anddimensions of five types of associated housinggrooves for the rings when used at pressures notnormally exceeding 1 500 lbf/in2 (100 bar2)). Limitsfor imperfections are not specified in this standardbut information is given in the note to clause 2.

NOTE 1 At pressures exceeding 1 500 lbf/in2, or when thediametral clearances of the grooves are in excess of thosespecified in this standard, it is recommended that “O”-rings

should be used in conjunction with anti-extrusion back-up rings.NOTE 2 The titles of the publications referred to in thisstandard are listed on the inside back cover.

2 “O”-rings

NOTE Surface imperfections. It is important that “O”-ringsurface imperfections should be such that they do not affect thesealing properties. Acceptable limits of defined and assessedimperfections on elastomeric toroidal sealing rings are specifiedin BS 6442.

2.1 Dimensions

The dimensions and the tolerances of the “O”-ringsshall be in accordance with Table 1 to Table 5.

2.2 Material

“O”-rings shall be manufactured from elastomericmaterials that are compatible with the fluidcontained by the seal, i.e. that the properties of thematerial are not altered by chemical interaction.

NOTE 1 Means of assessing the compatibility of hydraulicfluids with elastomeric materials are specified in BS 4832.

NOTE 2 “O”-rings are normally supplied in nitrile rubber butmay also be produced in other elastomers, e.g. silicone,fluorocarbon.

2.3 Seal size number

“O”-rings shall be identified by the seal sizenumbers given in Table 1 to Table 5.

3 Housing grooves

3.1 General

The profiles, dimensions and tolerances of thehousing grooves shall be according to the type ofsealing application as follows:

a) diametral sealing, Figure 2(a) and Figure 2(b)and Table 6;

b) static face sealing, Figure 3 and Table 7;

c) triangular housing of static face sealing, Figure 4 and Table 8.

3.2 Tolerances of nominal housing diameter

The tolerances associated with diameter C or D3) shall be calculated with respect to the tolerance

specified for radial depth F given in Table 6 and anachievable tolerance for the groove diameters c andd, in accordance with Figure 2(a) and Figure 2(b).

3.3 Extrusion gap

To maintain an acceptable extrusion gap, thetolerances of the diameter of the mating parts shallbe selected with respect to the following:

a) tolerance of the nominal diameter, C or D3),calculated in accordance with 3.2;

b) the maximum total diametral clearance G (see Table 6), in accordance with Figure 2(a) andFigure 2(b).

3.4 Lead-in chamfer

To facilitate assembly and to prevent damage to“O”-rings, components over which the “O”-ringpasses during fitting shall incorporate a smoothlead-in chamfer. All associated corners shall beradiused.

NOTE Details are shown in Figure 2(a) and Figure 2(b) anddimensions are given in Table 6.

3.5 Surface texture

The surface texture of the housing groove andassociated surfaces, in accordance with BS 1134-1,

shall not exceed the following values:

2) 1 bar = 105 N/m2 = 102 kPa.3) BS 5242-1 specifies tolerances and classes of surface texture for the surfaces of tubular steel cylinder barrels.

a) dynamic sealing surfaces 0.4 4m Ra

b) static sealing surfaces 0.8 4m Ra

c) non-sealing surfaces 1.6 4m Ra

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Table 1 — Dimensions of “O”-rings of nominal cross section 1 / 16 in and less

“O”-ring sizeno.

Actual diametersa Nominal diameters

Cross section,

A ± 0.003

Internal, B C b Dc

in in in in

001002003

0.0400.0500.060

0.0290.0420.056

± 0.004

d

d

d

d

d

d

004005006007008009010011

012013014

0.0700.0700.0700.0700.0700.0700.0700.070

0.0700.0700.070

0.0700.1010.1140.1450.1760.2080.2390.301

0.3640.4260.489

± 0.005

5/647/641/85/323/167/321/45/16

3/87/16

1/2

13/6415/641/49/325/1611/323/87/161/29/165/8

015 0.070 0.551 ± 0.007 9/1611/32

016017018019020021

0.0700.0700.0700.0700.0700.070

0.6140.6760.7390.8010.8640.926

± 0.009

5/811/163/413/167/815/16

3/413/167/815/16

111/16

022023024

0.0700.0700.070

0.9891.0511.114

± 0.010

111/6

11/8

11/8

13/16

11/4

025

026027

0.070

0.0700.070

1.176

1.2391.301 ± 0.011

13/16

11

/415/16

15/16

13

/817/16

028029030

0.0700.0700.070

1.3641.4891.614

± 0.013

13/8

11/2

15/8

11/2

15/8

13/4

031032

0.0700.070

1.7391.864 ± 0.015

13/4

17/8

17/8

2

033034035036037

0.0700.0700.0700.0700.070

1.9892.1142.2392.3642.489

± 0.018

221/8

21/4

23/8

21/2

21/8

21/4

23/8

21/2

25/8

038039

040

0.0700.070

0.070

2.6142.739

2.864

± 0.020

25/8

23/4

27

/8

23/4

27/8

3041042043

0.0700.0700.070

2.9893.2393.489

± 0.024331/4

31/2

31/8

33/8

35/8

044045

0.0700.070

3.7393.989 ± 0.027

33/4

437/8

41/8

046047048

0.0700.0700.070

4.2394.4894.739

± 0.030

41/441/2

43/4

43/8

45/8

47/8

049050

0.0700.070

4.9895.239 ± 0.037

551/4

51/8

53/8

NOTE 1 The full range of sizes given are suitable for static sealing.

NOTE 2 For dynamic sealing select only “O”-ring size nos. 004 to 012.a See Figure 1.b See Figure 2(b), Figure 3 and Figure 4.c See Figure 2(a) and Figure 3.d Since “O”-ring sizes nos. 001,002 and 003 are extremely small special care should be taken in the selection ofhousing sizes to achieve an adequate squeeze.

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Table 2 — Dimensions of “O” -rings of nominal cross section 3/32 in

“O”-ring

size no.


Cross section, A ± 0.003

Internal, B C b Dc

in in in in

102103104105106107108109110

111112

0.1030.1030.1030.1030.1030.1030.1030.1030.103

0.1030.103

0.0490.0810.1120.1430.1740.2060.2370.2990.362

0.4240.487

± 0.005

1/163/321/85/323/167/321/45/163/87

/161/2

1/49/325/1611/323/813/327/161/29/165

/811/16

113 0.103 0.549 ± 0.007 9/163/4

114115116

0.1030.1030.103

0.6120.6740.737

± 0.009

5/811/163/4

13/167/815/16

117

118

119

120

121

122

0.103

0.103

0.103

0.103

0.103

0.103

0.799

0.862

0.924

0.987

1.049

1.112

± 0.010

13/167/815/16

1

11/16

11/8

1

11/16

11/813/16

11/4

15/16

123

124

125

126

127

128

0.103

0.103

0.103

0.103

0.103

0.103

1.174

1.237

1.299

1.362

1.424

1.487

± 0.012

13/16

11/4

15/16

13/8

17/16

11/2

13/8

17/16

11/219/16

15/8

111/16

129

130

131

132

133

0.103

0.103

0.103

0.103

0.103

1.549

1.612

1.674

1.737

1.799

± 0.015

19/16

15/8

111/16

13/4

113/16

13/4

113/16

17/8115/16

2

134135136137138139140

0.1030.1030.1030.1030.1030.1030.103

1.8621.9251.9872.0502.1122.1752.237

± 0.017

17/8

115/16

221/16

21/8

23/16

21/4

21/16

21/823/16

21/4

25/16

23/8

27/16


NOTE 2 For dynamic sealing select only “O”-ring size nos. 102 to 116.a See Figure 1.b See Figure 2(b), Figure 3 and Figure 4.c See Figure 2(a) and Figure 3.

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Table 2 — Dimensions of “O” -rings of nominal cross section 3/32 in

“O”-ring

size no.



Internal, B C b Dc

in in in in

141

142

143

144

145

146

0.103

0.103

0.103

0.103

0.103

0.103

2.300

2.362

2.425

2.487

2.550

2.612

± 0.020

25/16

23/8

27/16

21/2

29/16

25/8

21/2

29/16

25/8

211/16

23/4

213/16

147148149150

0.1030.1030.1030.103

2.6752.7372.8002.862

± 0.022

211/16

23/4

213/1627/8

27/8215/16

331/16

151152153

0.1030.1030.103

2.9873.2373.487

± 0.024331/4

31/2

33/16

37/16

311/16

154155

0.1030.103

3.7373.987

± 0.02833/4

4315/16

43/16

156157158

0.1030.1030.103

4.2374.4874.737

± 0.03041/4

41/2

43/4

47/16

411/16

415/16

159160

161162163

0.1030.103

0.1030.1030.103

4.9875.237

5.4875.7375.987

± 0.035

551/4

51

/253/4

6

53/16

57/16

511

/16515/16

63/16

164165166167

0.1030.1030.1030.103

6.2376.4876.7376.987

± 0.040

61/461/2

63/4

7

67/16

611/16

615/16

73/16

168169170171

0.1030.1030.1030.103

7.2377.4877.7377.987

± 0.045

71/471/2

73/4

8

77/16

711/16

715/16

83/16

172

173174175

0.103

0.1030.1030.103

8.237

8.4878.7378.987

± 0.050

81/4

81

/283/49

87/16

811

/16815/16

93/16

176177178

0.1030.1030.103

9.2379.4879.737

± 0.05591/4

91/2

93/4

97/16

911/16

915/16



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© BSI 07-1999 5

Table 3 — Dimensions of “O”-rings of nominal cross section 1/8 in

“O”-ring

size no.



Internal, B C b Dc

in in in in

201

202

203

204

205

206

0.139

0.139

0.139

0.139

0.139

0.139

0.171

0.234

0.296

0.359

0.421

0.484

± 0.005

3/161/45/163/87/161/2

7/16

1/29/165/811/163/4

207 0.139 0.546 ± 0.007 9/1613/16

208

209

0.139

0.139

0.609

0.671

± 0.0095/811

/16

7/815

/16

210

211

212

213

214

215

0.139

0.139

0.139

0.139

0.139

0.139

0.734

0.796

0.859

0.921

0.984

1.046

± 0.010

3/413/167/815/16

1

11/16

1

11/16

11/8

13/16

11/4

15/16

216

217

218

219

220

221

0.139

0.139

0.139

0.139

0.139

0.139

1.109

1.171

1.234

1.296

1.359

1.421

± 0.012

11/8

13/16

11/4

15/16

13/8

17/16

13/8

17/16

11/2

19/16

15/8

111/16

222223224

0.1390.1390.139

1.4841.6091.734

± 0.01511/2

15/813/4

13/4

17/82

225226227

0.1390.1390.139

1.8591.9842.109

± 0.01817/8

221/8

21/8

21/423/8

228229230231

0.1390.1390.1390.139

2.2342.3592.4842.609

± 0.020

21/423/8

21/225/8

21/225/8

23/427/8

232233234235236237238

0.1390.1390.1390.1390.1390 1390.139

2.7342.8592.9843.1093.2343.3593.484

± 0.024

23/4

27/8

331/831/4

33/8

31/2

331/8

31/4

33/831/2

35/8

33/4



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BS 1806:1989

6 © BSI 07-1999


“O”-ring

size no.



Internal, B C b Dc

in in in in

239240241242243

0.1390.1390.1390.1390.139

3.6093.7343.8593.9844.109

± 0.028

35/8

33/437/8

441/8

37/8

441/8

41/4

43/8

244245246

247248

0.1390.1390.139

0.1390.139

4.2344.3594.484

4.6094.734

± 0.030

41/4

43/8

41/2

45

/843/4

41/2

45/8

43/4

47

/85

249250251252253254255256257258

0.1390.1390.1390.1390.1390.1390.1390.1390.1390.139

4.8594.9845.1095.2345.3595.4845.6095.7345.8595.984

± 0.035

47/8551/8

51/453/8

51/2

55/853/457/8

6

51/851/453/8

51/255/8

53/4

57/8661/8

61/4

259260261262

0.1390.1390.1390.139

6.2346.4846.7346.984

± 0.0406

1

/461/263/4

7

61

/263/4771/4

263264265266

0.1390.1390.1390.139

7.2347.4847.7347.984

± 0.045

71/471/2

73/4

8

71/273/4

881/4

267268269270

0.1390.1390.1390.139

8.2348.4848.7348.984

± 0.050

81/4

81/2

83/49

81/2

83/4

991/4

271272273274275

0.1390.1390.1390.1390.139

9.2349.4849.7349.984

10.484

± 0.055

91/4

91/2

93/410101/2

91/2

93/4

10101/4103/4



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“O”-ring

size no.



Internal, B C b Dc

in in in in

276

277

278

279

280

281

0.139

0.139

0.139

0.139

0.139

0.139

10.984

11.484

11.984

12.984

13.984

14.984

± 0.065

11

111/2

12

13

14

15

111/4

113/4

121/4

131/4

141/4

151/4


NOTE 2 For dynamic sealing select only “O”-ring size nos. 201 to 222.a

See Figure 1.b See Figure 2(b), Figure 3 and Figure 4.c See Figure 2(a) and Figure 3.

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BS 1806:1989

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“O”-ring

size no.



Internal, B C b Dc

in in in in

309310

0.2100.210

0.4120.475

± 0.0057/16

1/2

13/167/8

311 0.210 0.537 ± 0.007 9/1615/16

312313

0.2100.210

0.6000.662

± 0.0095/811/16

111/16

314

315

316

317318

319

0.210

0.210

0.210

0.2100.210

0.210

0.725

0.787

0.850

0.9120.975

1.037

± 0.010

3/413/167/815

/16

1

11/16

11/8

13/16

11/4

15

/16

13/8

17/16

320321322323324

0.2100.2100.2100.2100.210

1.1001.1621.2251.2871.350

± 0.012

11/8

13/16

11/4

15/16

13/8

11/2

19/16

15/8

111/16

13/4

325326327328

0.2100.2100.2100.210

1.4751.6001.7251.850

± 0.015

11/2

15/8

13/4

17/8

17/8

221/8

21/4

329330331332

0.2100.2100.2100.210

1.9752.1002.2252.350

± 0.018

221/8

21/4

23/8

23/821/2

25/8

23/4

333334335336

0.2100.2100.2100.210

2.4752.6002.7252.850

± 0.020

21/2

25/8

23/427/8

27/8

331/831/4

337

338

339

340

341

0.210

0.210

0.210

0.210

0.210

2.975

3.100

3.225

3.350

3.475

± 0.024

3

31/8

31/4

33/8

31/2

33/8

31/2

35/8

33/4

37/8

342343344345346

0.2100.2100.2100.2100.210

3.6003.7253.8503.9754.100

± 0.028

35/833/4

37/8

441/8

441/8

41/4

43/841/2



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“O”-ring

size no.



Internal, B C b Dc

in in in in

347

348

349

350

351

352

0.210

0.210

0.210

0.210

0.210

0.210

4.225

4.350

4.475

4.600

4.725

4.850

± 0.030

41/4

43/8

41/2

45/8

43/4

47/8

45/8

43/4

47/8

5

51/8

51/4

353354

355356357358359360361

0.2100.210

0.2100.2100.2100.2100.2100.2100.210

4.9755.100

5.2255.3505.4755.6005.7255.8505.975

± 0.037

551/8

51/453/8

51/2

55/8

53/4

57/8

6

53/8

51/2

55/853/4

57/8

661/8

61/4

63/8

362363364365

0.2100.2100.2100.210

6.2256.4756.7256.975

± 0.040

61/461/263/4

7

65/867/871/8

73/8

366

367368369

0.210

0.2100.2100.210

7.205

7.4757.7257.975

± 0.045

71/4

71/273/4

8

75/8

77/881/8

83/8

370371372373

0.2100.2100.2100.210

8.2258.4758.7258.975

± 0.050

81/4

81/283/4

9

85/8

87/891/8

93/8

374375376377

0.2100.2100.2100.210

9.2259.4759.7259.975

± 0.055

91/4

91/293/4

10

95/8

97/8101/8

103/8

378

379

0.210

0.210

10.475

10.975 ± 0.060

101/2

11

107/8

113/8

380381382

0.2100.2100.210

11.47511.97512.975

± 0.065111/2

1213

117/8

123/8

133/8

383

384

0.210

0.210

13.975

14.975± 0.070

14

15

143/8

153/8



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BS 1806:1989

10 © BSI 07-1999


“O”-ring

size no.

Actual diametersb Nominal diameters


Internal, B C b Dc

in in in in

385 0.210 15.955 ± 0.075 16 163/8

386 0.210 16.955 ± 0.080 17 173/8

387 0.210 17.955 ± 0.085 18 183/8

388 0.210 18.955 ± 0.090 19 193/8

389

390

0.210

0.210

19.955

20.955± 0.095

20

21

203/8

213/8

391 0.210 21.955 ± 0.100 22 223/8

392 0.210 22.940 ± 0.105 23 233/8

393 0.210 23.940 ± 0.110 24 243/8

394 0.210 24.940 ± 0.115 25 253/8

395 0.210 25.940 ± 0.120 26 263/8



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© BSI 07-1999 11


“O”-ring

size no.



Internal, B C b Dc

in in in in

425426427428

0.2750.2750.2750.275

4.4754.6004.7254.850

± 0.033

41/2

45/843/4

47/8

551/851/4

53/8

429

430

431

432

433

434

435

436

437

0.275

0.275

0.275

0.275

0.275

0.275

0.275

0.275

0.275

4.975

5.100

5.225

5.350

5.475

5.600

5.725

5.850

5.975

± 0.037

5

51/8

51/4

53/8

51/2

55/8

53/4

57/8

6

51/2

55/8

53/4

57/8

6

61/8

61/4

63/8

61/2

438439440441

0.2750.2750.2750.275

6.2256.4756.7256.975

± 0.040

61/4

61/2

63/4

7

63/4

771/4

71/2

442443444445

0.2750.2750.2750.275

7.2257.4757.7257.975

± 0.045

71/471/2

73/4

8

73/4881/4

81/2

445A 446446A 447447A 448448A 449

0.2750.2750.2750.2750.2750.2750.2750.275

8.2258.4758.7258.9759.2259.4759.7259.975

± 0.055

81/4

81/283/4991/4

91/293/4

10

83/4

991/491/2

93/410101/4

101/2

449A 450450A 451

451A 452452A 453454455

0.2750.2750.2750.275

0.2750.2750.2750.2750.2750.275

10.22510.47510.72510.975

11.22511.47511.72511.97512.47512.975

± 0.060

101/4

101/2103/4

11

111/4111/2

113/4

12121/2

13

103/4

11111/4

111/2

113/412121/4

121/213131/2



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BS 1806:1989

12 © BSI 07-1999


“O”-ring

size no.



Internal, B C b Dc

in in in in

456

457

458

459

460

0.275

0.275

0.275

0.275

0.275

13.475

13.975

14.475

14.975

15.475

± 0.070

131/2

14

141/2

15

151/2

14

141/2

15

151/2

16

461462

0.2750.275

15.95516.455

± 0.07516161/2

161/2

17

463 0.275 16.955 ± 0.080 17 171/2

464465466

0.2750.2750.275

17.45517.95518.455

± 0.085 171

/218181/2

18181/219

467468

0.2750.275

18.95519.455

± 0.09019191/2

191/220

469470

0.2750.275

19.95520.955

± 0.0952021

201/2

211/2

471 0.275 21.955 ± 0.100 22 221/2

472 0.275 22.940 ± 0.105 23 231/2

473 0.275 23.940 ± 0.11 24 241/2

474 0.275 24.940 ± 0.115 25 251/2

475 0.275 25.940 ± 0.120 26 261/2



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© BSI 07-1999 13

Figure 1 — “O”-ring

Figure 2 — Housing grooves

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14 © BSI 07-1999

Table 6 — Dimensions of housings for diametral sealing

“O”-ring Diameter, C Diameter, D Groove

width, E ± 0.005

Radial depth, F Minimum

cross-sectionalsqueeze of“O”-ringa

Maximum

diametralclearance,G

2 T

Size no. Crosssection

diameter, A

Max. Min.

in in in in in in in

004 to 050

102 to 178

201 to 281

309 to 395

425 to 475

0.070

0.103

0.139

0.210

0.275

Equal tonominaldiameter C of Table 1 toTable 5

Equal tonominaldiameter D of Table 1 toTable 5

0.094

0.141

0.188

0.281

0.375

0.062

0.094

0.125

0.188

0.250

0.060

0.091

0.122

0.184

0.245

0.005

0.006

0.010

0.017

0.019

0.005

0.005

0.006

0.007

0.008

0.170

0.240

0.320

0.460

0.600

a This is included for reference purposes only.

Figure 3 — Face sealing

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BS 1806:1989

© BSI 07-1999 15

Table 7 — Dimensions of housings for static face sealing

Table 8 — Dimensions of triangular housings for static face sealings

“O”-ring Diameter,

C ± 0.010

Diameter,

D ± 0.010

Groove depth,

H ± 0.005

Minimum

recess width, K

Minimum

cross-sectionalsqueeze of“O”-ringa

Size no. Cross sectiondiameter, A

in in in in

004 to 050

102 to 178

201 to 281

309 to 395

425 to 475

0.070

0.103

0.139

0.210

0.275

Equal tonominaldiameter C of Table 1to Table 5

Equal tonominaldiameter D of Table 1to Table 5

0.056

0.086

0.115

0.175

0.236

0.095

0.140

0.190

0.280

0.370

0.006

0.009

0.015

0.025

0.028

a This is included for reference purposes only.

Figure 4 — Triangular housings

“O”-ring Diameter,C

Maximumdiametralclearance,

G

Chamfer, M Maximumradius on

spigot, R

Minimumspigot length,

LSize no. Cross sectiondiameter,

A

in in in in in

004 to 050

102 to 178

201 to 281

309 to 395425 to 475

0.070

0.103

0.139

0.2100.275

Equal tonominaldiameter C ofTable 1 to

Table 5

0.005

0.005

0.006

0.0070.008

0.095

0.145

0.195

0.2950.395

0.030

0.040

0.060

0.0900.100

3/16

1/45/16

7/16

9/16

+0.0050 –

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16 blank

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BS 1806:1989

© BSI 07-1999

Publications referred to

BS 350, Conversion factors and tables4).

BS 1134, Method for the assessment of surface texture.

BS 1134-1, Method and instrumentation.BS 4832, Specification for compatibility between elastomeric materials and hydraulic fluids.

BS 5242, Tubes for fluid power cylinder barrels.

BS 5242-1, Specification for steel tubes with specially finished surfaces.

BS 5242-2, Specification for non-ferrous metallic tubes with specially finished bores.

BS 6442, Specification for limits of surface imperfections on elastomeric toroidal sealing rings (“O”-rings).

British Standard BS M 48, Specification for dimensions of elastomeric toroidal sealing rings for aerospaceuse — inch series4).

SAE Aerospace Standard AS 568A; 1984, Aerospace size standard for “O”-rings5).

4) Referred to in the foreword only.5) Published by the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096, USA.

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BS 1806:1989

BSI

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London

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BS 1806 [1989]

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Transcript of BS 1806 [1989]