PTFE Back Up Rings

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Category:

Design:

This range of products is designed to overcome the problems of ‘O’-Ring extrusion when the system pressures are greater than the sealing capabilities of an unsupported ‘O’-Ring. The use of P.T.F.E. for anti-extrusion rings has many advantages over ‘hard rubber’ materials, particularly at high system pressures. The cold flow characteristics of PTFE are used to full advantage in reducing the extrusion gaps to a minimum and allowing automatic compensation for wear. The capability of specialist compounding to suit extremes of duty combined with a high resistance to virtually all chemicals, low friction and wear rates render PTFE as the ideal material for anti-extrusion devices.

 

Spiral

The spiral back up ring is the most common style in use being effectively self adjusting to diametral tolerances. Spiral back up rings are manufactured from virgin PTFE only.

Manufactured to suit O-Rings to BS1806, BS4518, JISB2401, JW17000, MS28782 standards Order as part number shown on table.e.g. BS 210 or as below…

BS1806 … BS006                                    JISB2401 … JISP003

BS4518 … BS0031-16                             JW17000 … SJWI7001 MS28782 … MS28782-001

Endless

The endless back up ring is used where problems can occur with the rotation of a screwed endcaps which on assembly could cause a spiral type to unwind. Endless back up rings are normally manufactured from virgin PTFE.

Manufactured to suit O-Rings to BS1806, BS4518, JISB2401, MS27595 standards.

 

Order as part number shown on the table with suffix E, e.g. BS 210/E or as below…

BS1806 … BS006/E                                BS4518 … BS0031-16/E

JISB2401… JISP003/E                            MS27595 … MS27595-004

The endless split back up ring is manufactured as the endless style but is split at 30o to facilitate ease of assembly in certain applications. Endless split back up rings are normally manufactured from virgin PTFE.Endless Split

Manufactured to suit O-Rings to BS1806, BS4518, JISB2401, MS28774, AS8791/1 standards. Order as part number shown on the table with the suffix ES, e.g. BS 210/ES or as below…

BS1806 … BS006/ES                             BS4518 … BS0031-16/ES

JISB2401 … JISP003/ES                        MS28774 … MS28774-004/ES AS8791/1 … M8791-004/ES

How to order:

All the above can be supplied in a variety of PTFE materials including Virgin PTFE, Glass Filled PTFE and material specifications to MIL-R-8791/1.

The Endless and Endless Split Styles can also be supplied in Acetal, Nylon and Peek materials along with a variety of other filled PTFE grades such as Carbon and Bronze.

 

Housing:

For surface finish and recommended lead in chamfers refer to the illustration below. For housing dimensions and machining

tolerances refer to the catalogue page of selected seal. Refer to appendix 4 for value of tolerance symbols.

Fitting:

For the back up ring to function correctly, it is important that care be taken in fitting the backup within its housing.
For a detailed checklist, refer to Appendix 3.

 

Operating conditions:

Housing groove dimensions for ‘O’-Rings to BS1806 and BS4518 fitted with back-up rings in Dynamic and Static diametral applications.

Tables 1 & 2 refer to the housing drawings.

IMPERIAL
Housing groove dimensions for O-Rings to BS1806 fitted with back-up rings in Dynamic & Static diametrical applications.
 

O-Ring Section

 

Radial Width ‘S’

Groove Width L1 Radius ‘R1’

Max.

Cham. ‘C’

Min.

One back-up ring Two back-up rings
Max. Min. Max. Min. Max. Min.
0.070″ 0.062″ 0.060″ 0.152″ 0.147″ 0.210″ 0.205″ 0.030″ 0.085″
0.103″ 0.094″ 0.091″ 0.199″ 0.194″ 0.257″ 0.252″ 0.030″ 0.097″
0.139″ 0.125″ 0.122″ 0.247″ 0.241″ 0.305″ 0.299″ 0.030″ 0.103″
0.210″ 0.188″ 0.184″ 0.355″ 0.348″ 0.427″ 0.420″ 0.030″ 0.156″
0.275″ 0.250″ 0.245″ 0.480″ 0.473″ 0.582″ 0.576″ 0.030″ 0.187″

Table 1

METRIC
Housing groove dimensions for O-Rings to BS4518 fitted with back-up rings in Dynamic & Static diametrical applications.
 

O-Ring Section

 

Radial Width ‘S’

Groove Width L1 Radius ‘R1’

Max.

Chamf. ‘C’

Min.

One back-up ring Two back-up rings
Max. Min. Max. Min. Max. Min.
1.6 mm 1.3 mm 1.25 mm 4.0 mm 3.8 mm 5.4 mm 5.2 mm 0.5 mm 2.2 mm
2.4 mm 2.09 mm 1.97 mm 4.8 mm 4.6 mm 6.2 mm 6.0 mm 0.5 mm 2.2 mm
3.0 mm 2.65 mm 2.50 mm 5.6 mm 5.4 mm 7.0 mm 6.8 mm 1.0 mm 2.6 mm
5.7 mm 5.18 mm 4.95 mm 9.5 mm 9.3 mm 11.3 mm 11.1 mm 1.0 mm 3.7 mm

Table 2

Claron Part Number Nominal Dimensions
Ød           ØD         T Max.        O-Ring
1                          1                                        Section
Claron Part Number Nominal Dimensions
Ød           ØD         T Max.       O-Ring
1                          1                                        Section
BS 005
BS 006
BS 007
BS 008
BS 009
BS 010
BS 011
BS 012
BS 013
BS 014
BS 015
BS 016
BS 017
BS 018
BS 019
BS 020
BS 021
BS 022
BS 023
BS 024
0.109
0.125
0.156
0.187
0.219
0.250
0.312
0.375
0.437
0.500
0.562
0.625
0.687
0.750
0.812
0.875
0.937
1.000
1.062
1.125
0.234
0.250
0.281
0.312
0.344
0.375
0.437
0.500
0.562
0.625
0.687
0.750
0.812
0.875
0.937
1.000
1.062
1.125
1.187
1.250
BS 113
BS 114
BS 115
BS 116
BS 117
BS 118
BS 119
BS 120
BS 121
BS 122
BS 123
BS 124
BS 125
BS 126
BS 127
BS 128
BS 129
BS 130
BS 131
BS 132
0.562
0.625
0.687
0.750
0.812
0.875
0.937
1.000
1.062
1.125
1.187
1.250
1.312
1.375
1.437
1.500
1.562
1.625
1.687
1.750
0.750
0.812
0.875
0.937
1.000
1.062
1.125
1.187
1.250
1.312
1.375
1.437
1.500
1.562
1.625
1.687
1.750
1.812
1.875
1.937
BS 025
BS 026
BS 027
BS 028
BS 029
BS 030
BS 031
BS 032
BS 033
BS 034
BS 035
BS 036
BS 037
BS 038
BS 039
BS 040
BS 041
BS 042
BS 043
BS 044
BS 045
BS 046
BS 047
BS 048
BS 049
BS 050
BS 108
BS 109
BS 110
BS 111
BS 112
1.187
1.250
1.312
1.375
1.500
1.625
1.750
1.875
2.000
2.125
2.250
2.375
2.500
2.625
2.750
2.875
3.000
3.250
3.500
3.750
4.000
4.250
4.500
4.750
5.000
5.250
0.250
0.312
0.375
0.437
0.500
1.312
1.375
1.437
1.500
1.625
1.750
1.875
2.000
2.125
2.250
2.375
2.500
2.625
2.750
2.875
3.000
3.125
3.375
3.625
3.875
4.125
4.375
4.625
4.875
5.125
5.375
0.437
0.500
0.562
0.625
0.687
0.058         0.070
0.058         0.103
BS 133
BS 134
BS 135
BS 136
BS 137
BS 138
BS 139
BS 140
BS 141
BS 142
BS 143
BS 144
BS 145
BS 146
BS 147
BS 148
BS 149
BS 150
BS 151
BS 152
BS 153
BS 154
BS 155
BS 156
BS 157
BS 158
BS 159
BS 160
BS 161
BS 162
1.812
1.875
1.937
2.000
2.062
2.125
2.187
2.250
2.312
2.375
2.437
2.500
2.562
2.625
2.687
2.750
2.812
2.875
3.000
3.250
3.500
3.750
4.000
4.250
4.500
4.750
5.000
5.250
5.500
5.750
2.000
2.062
2.125
2.187
2.250
2.312
2.375
2.437
2.500
2.562
2.625
2.687
2.750
2.812
2.875
2.937
3.000
3.062
3.187
3.437
3.687
3.937
4.187
4.437
4.687
4.937
5.187
5.437
5.687
5.937
0.058         0.103
BS 206 0,500 0,750 BS 256 5,750 6,000
BS 207 0,562 0,812 BS 257 5,875 6,125
BS 208 0,625 0,875 BS 258 6,000 6,250
BS 209 0,687 0,937 BS 259 6,250 6,500
BS 210 0,750 1,000 BS 260 6,500 6,750
BS 211 0,812 1,062 BS 261 6,750 7,000
BS 212 0,875 1,125 BS 262 7,000 7,250
BS 213 0,937 1,187 BS 263 7,250 7,500
BS 214 1,000 1,250 BS 264 7,500 7,750
BS 215 1,062 1,312 BS 265 7,750 8,000
BS 216 1,125 1,375 BS 266 8,000 8,250
BS 217 1,187 1,437 BS 267 8,250 8,500
BS 218 1,250 1,500 BS 268 8,500 8,750
BS 219 1,312 1,562 BS 269 8,750 9,000
BS 220 1,375 1,625 BS 270 9,000 9,250
0.058         0.139
BS 221 1,437 1,687 BS 271 9,250 9,500
BS 222 1,500 1,750 BS 272 9,500 9,750
BS 223 1,625 1,875 BS 273 9,750 10,000
BS 224 1,750 2,000 BS 274 10,000 10,250
BS 225 1,875 2,125 BS 275 10,500 10,750
BS 226 2,000 2,250 BS 276 11,000 11,250
BS 227 2,125 2,375 BS 277 11,500 11,750
BS 228 2,250 2,500 BS 278 12,000 12,250
BS 229 2,375 2,625 0,058 0,139 BS 279 13,000 13,250
BS 230 2,500 2,750 BS 280 14,000 14,250
BS 231 2,625 2,875 BS 281 15,000 15,250
BS 232 2,750 3,000 BS 282 16,000 16,250
BS 233 2,875 3,125 BS 283 17,000 17,250
BS 234 3,000 3,250 BS 284 18,000 18,250
BS 235 3,125 3,375
BS 236 3,250 3,500 BS 314 0,750 1,125
BS 237 3,375 3,625 BS 315 0,812 1,187
BS 238 3,500 3,750 BS 316 0,875 1,250
BS 239 3,625 3,875 BS 317 0,937 1,312
BS 240 3,750 4,000 BS 318 1,000 1,375
BS 241 3,875 4,125 BS 319 1,062 1,437
BS 242 4,000 4,250 BS 320 1,125 1,500
BS 243 4,125 4,375 BS 321 1,187 1,562
BS 244 4,250 4,500 BS 322 1,250 1,625
BS 245 4,375 4,625 BS 323 1,312 1,687
BS 246 4,500 4,750 BS 324 1,375 1,750
BS 247 4,625 4,875 BS 325 1,500 1,875
BS 248 4,750 5,000 BS 326 1,625 2.000        0.072         0.210
BS 249 4,875 5,125 BS 327 1,750 2,125
BS 250 5,000 5,250 BS 328 1,875 2,250
BS 251 5,125 5,375 BS 329 2,000 2,375
BS 252 5,250 5,500 BS 330 2,125 2,500
BS 253 5,375 5,625 BS 331 2,250 2,625
BS 254 5,500 5,750 BS 332 2,375 2,750
BS 255 5,625 5,875 BS 333 2,500 2,875
BS 334 2,625 3,000
BS 335 2,750 3,125
BS 336 2,875 3,250
BS 337 3,000 3,375
BS 338 3,125 3,500
BS 339 3,250 3,625
BS 340 3,375 3,750
BS 341 3,500 3,875
BS 342 3,625 4,000
BS 343 3,750 4,125
BS 344 3,875 4,250
BS 345 4,000 4,375
BS 346 4,125 4,500
BS 347 4,250 4,625
BS 348 4,375 4,750
BS 349 4,500 4,875
BS 350 4,625 5,000
BS 351 4,750 5,125
BS 352 4,875 5,250
BS 353 5,000 5,375
BS 354 5,125 5,500
BS 355 5,250 5,625
BS 356 5,375 5,750
BS 357 5,500 5,875
BS 358 5,625 6,000
BS 359 5,750 6,125
BS 360 5,875 6,250
BS 361 6,000 6,375
BS 362 6,250 6,625
BS 363 6,500 6,875
BS 364 6,750 7,125
BS 365 7,000 7,375
BS 366 7,250 7,625
BS 367 7,500 7,875
BS 368 7,750 8,125
BS 369 8,000 8,375
BS 370 8,250 8,625
BS 371 8,500 8,875
BS 372 8,750 9,125
BS 373 9,000 9,375
BS 374 9,250 9,625
BS 375 9,500 9,875
BS 376 9,750 10,125
BS 377 10,000 10,375
BS 378 10,500 10,875
BS 379 11,000 11,375
BS 380 11,500 11,875
BS 381 12,000 12,375
BS 382 13,000 13,375
BS 383 14,000 14,375
BS 384 15,000 15,375
BS 385 16,000 16,375
BS 386 17,000 17,375
BS 387 18,000 18,375
BS 388 19,000 19,375
BS 389 20,000 20,375
BS 390 21,000 21,375
BS 391 22,000 22,375
BS 392 23,000 23,375
BS 393 24,000 24,375
BS 394 25,000 25,375
BS 395 26,000 26,375
issue 1 – 20/10/98
BS 425 4,500 5,000
BS 426 4,625 5,125
BS 427 4,750 5,250
BS 428 4,875 5,375
BS 429 5,000 5,500
BS 430 5,125 5,625
BS 431 5,250 5,750
BS 432 5,375 5,875
BS 433 5,500 6,000
BS 434 5,625 6,125
BS 435 5,750 6,250
BS 436 5,875 6,375
BS 437 6,000 6,500
BS 438 6,250 6,750
BS 439 6,500 7,000
BS 440 6,750 7,250
BS 441 7,000 7,500
BS 442 7,250 7,750
BS 443 7,500 8,000
BS 444 7,750 8,250
BS 445 8,000 8,500
BS 445A 8,250 8,750
BS 446 8,500 9,000
BS 446A 8,750 9,250
BS 447 9,000 9,500
BS 447A 9,250 9,750
.210                       BS 448                9.500      10.000      0.104         0.275
BS 448A 9,750 10,250
BS 449 10,000 10,500
BS 449A 10,250 10,750
BS 450 10,500 11,000
BS 450A 10,750 11,250
BS 451 11,000 11,500
BS 451A 11,250 11,750
BS 452 11,500 12,000
BS 452A 11,750 12,250
BS 453 12,000 12,500
BS 454 12,500 13,000
BS 455 13,000 13,500
BS 456 13,500 14,000
BS 457 14,000 14,500
BS 458 14,500 15,000
BS 459 15,000 15,500
BS 460 15,500 16,000
BS 461 16,000 16,500
BS 462 16,500 17,000
BS 463 17,000 17,500
BS 464 17,500 18,000
BS 465 18,000 18,500
BS 466 18,500 19,000
BS 467 19,000 19,500
BS 468 19,500 20,000
BS 469 20,000 20,500
BS 470 21,000 21,500
BS 471 22,000 22,500
BS 472 23,000 23,500
BS 473 24,000 24,500
BS 474 25,000 25,500
BS 475 26,000 26,500
0.072         0
BS  0031-16 3,5 6,0 BS  0195-30 20 25
BS  0041-16
BS  0051-16
4.5
5.5
7,0 BS  0215-30 22 27
BS  0061-16
BS  0071-16
6.5
7.5
9,0 BS 0225-30
BS 0245-30
23
25
28
30
BS 0081-16 8,5 11,0 BS 0255-30 26 31
BS 0091-16
BS 0101-16
BS 0111-16
9.5
10.5
11.5
12.0
13.0
BS 0265-30
BS 0275-30
27
28
32
BS 0121-16 12,5 15,0 BS 0295-30 30 35
BS 0131-16 13,5 16,0 BS 0315-30 32 37
BS 0141-16 14,5 17,0 1,4 1,6 BS 0325-30 33 38
BS 0151-16
BS 0161-16
BS 0171-16
15.5
16.5
17.5
18.0
19.0
BS 0345-30
BS 0355-30
35
36
40
BS 0181-16 18,5 21,0 BS 0365-30 37 42
BS 0191-16 19,5 22,0 BS 0375-30 38 43
BS 0221-16
BS 0251-16
BS 0271-16
22.5
25.5
27.5
25.0
28.0
30.0
BS 0395-30
BS 0415-30
BS 0425-30
40
42
43
45
48
BS 0291-16 29,5 32,0
BS 0321-16 32,5 35,0 BS 0445-30 45 50
BS 0351-16
BS 0371-16
35.5
37.5
38.0
40.0
BS 0495-30
BS 0545-30
50
55
55
BS 0036-24
BS 0046-24
4
5
8
9
BS 0555-30
BS 0575-30
56
58
61
63
BS 0056-24 6 10
BS 0066-24 7 11 BS 0595-30 60 65
BS 0076-24 8 12 BS 0635-30 64 69
BS 0086-24
BS 0096-24
BS 0106-24
9
10
11
13
14
15
BS 0645-30
BS 0695-30
BS 0745-30
65
70
75
70
75
80
BS 0116-24 12 16
BS 0126-24 13 17 BS 0795-30 80 85
BS 0136-24
BS 0146-24
14
15
18
19
BS 0845-30
BS 0895-30
85
90
90
95
1,4 3,0
BS 0156-24 16 20 BS 0945-30 95 100
BS 0166-24 17 21 BS 0995-30 100 105
BS 0176-24 18 22
BS 0186-24
BS 0196-24
BS 0206-24
19
20
21
23
24
25
BS 1045-30
BS 1095-30
BS 1145-30
105
110
115
110
115
120
BS 0216-24 22 26 BS 1195-30 120 125
BS 0246-24 25 29 BS 1245-30 125 130
BS 0276-24
BS 0296-24
BS 0316-24
28
30
32
32
34
1,4 2,4 BS 1295-30
BS 1345-30
130
135
135
BS 0346-24 35 39 BS 1395-30 140 145
BS 0356-24 36 40 BS 1445-30 145 150
BS 0376-24 38 42 BS 1495-30 150 155
BS 0396-24
BS 0416-24
40
42
44 BS 1545-30 155 160
BS 0446-24 45 49 BS 1595-30 160 165
BS 0456-24 46 50 BS 1645-30 165 170
BS 0476-24
BS 0496-24
48
50
52
54
BS 1695-30
BS 1745-30
170
175
175
180
BS 0516-24
BS 0536-24
52
54
56 BS  1795-30 180 185
BS 0546-24 55 59 BS  1845-30 185 190
BS 0576-24
BS 0586-24
BS 0596-24
58
59
60
62
63
64
BS  1895-30
BS  1945-30
BS  1995-30
190
195
200
195
200
205
BS 0616-24 62 66
BS  0626-24 63 67 BS  2045-30 205 210
BS  0646-24
BS  0676-24
BS  0696-24
65
68
70
69
72
74
BS  2095-30
BS  2195-30
BS  2295-30
BS  2395-30
210
220
230
240
215
235
BS  2495-30
BS  0443-57
BS  0453-57
BS 0493-57
BS 0523-57
BS 0543-57
BS 0553-57
BS 0593-57
BS 0623-57
BS 0643-57
BS 0693-57
BS 0743-57
BS 0793-57
BS 0843-57
BS 0893-57
BS 0943-57
BS 0993-57
BS 1043-57
BS 1093-57
BS 1143-57
BS 1193-57
BS 1243-57
BS 1293-57
BS 1343-57
BS 1393-57
BS 1443-57
BS 1493-57
BS 1543-57
BS 1593-57
BS 1643-57
BS 1693-57
45
46
50
53
55
56
60
63
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
55
56
60
63
65
66
70
73
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
1.8            5.7 BS  1743-57
BS  1793-57
BS  1843-57
BS  1893-57
BS  1943-57
BS  1993-57
BS  2043-57
BS  2093-57
BS  2143-57
BS  2193-57
BS  2293-57
BS  2393-57
BS  2493-57
BS  2593-57
BS  2693-57
BS  2793-57
BS  2893-57
BS  2993-57
BS  3193-57
BS  3393-57
BS  3593-57
BS  3793-57
BS  3993-57
BS  4193-57
BS  4393-57
BS  4593-57
BS  4793-57
BS  4893-57
BS  4993-57
175
180
185
190
195
200
205
210
215
220
230
240
250
260
270
280
290
300
320
340
360
380
400
420
440
460
480
490
500
185
190
195
200
205
210
215
220
225
230
240
250
260
270
280
290
300
310
330
350
370
390
410
430
450
470
490
500
510
1,8 5,7

 

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