Overview of Nitrile O-Rings
Nitrile O-Rings are a widely used type of rubber seal gasket, valued for their versatility across various applications and environments. Commonly regarded as general-purpose O-rings, they provide effective sealing against water, gasoline, petroleum oils, crude oil, propane, and several hydraulic fluids.
Features of Buna-N (Nitrile) O-Rings
- Material Grade: 4900-70 Nitrile
- Color: Black*
- Durometer Hardness: 70
- Temperature Range: -35°C to 110°C
Ordering Table
| Drawing | Reference | O-Ring Size | O-Ring Material | O-Ring OD | O-Ring ID | O-Ring Cross Section | O-Ring Color | Part Number |
| O-ring Seals, Nitrile (Buna-N) | 309 | 4900-70 Nitrile | 0.832 | 0.412 | 0.210 | Black | O-B309 |
| O-ring Seals, Nitrile (Buna-N) | 310 | 4900-70 Nitrile | 0.895 | 0.475 | 0.210 | Black | O-B310 |
| O-ring Seals, Nitrile (Buna-N) | 311 | 4900-70 Nitrile | 0.957 | 0.537 | 0.210 | Black | O-B311 |
| O-ring Seals, Nitrile (Buna-N) | 312 | 4900-70 Nitrile | 1.020 | 0.600 | 0.210 | Black | O-B312 |
| O-ring Seals, Nitrile (Buna-N) | 313 | 4900-70 Nitrile | 1.082 | 0.662 | 0.210 | Black | O-B313 |
| O-ring Seals, Nitrile (Buna-N) | 314 | 4900-70 Nitrile | 1.145 | 0.725 | 0.210 | Black | O-B314 |
| O-ring Seals, Nitrile (Buna-N) | 315 | 4900-70 Nitrile | 1.207 | 0.787 | 0.210 | Black | O-B315 |
| O-ring Seals, Nitrile (Buna-N) | 316 | 4900-70 Nitrile | 1.270 | 0.850 | 0.210 | Black | O-B316 |
| O-ring Seals, Nitrile (Buna-N) | 317 | 4900-70 Nitrile | 1.332 | 0.912 | 0.210 | Black | O-B317 |
| O-ring Seals, Nitrile (Buna-N) | 318 | 4900-70 Nitrile | 1.395 | 0.975 | 0.210 | Black | O-B318 |
| O-ring Seals, Nitrile (Buna-N) | 319 | 4900-70 Nitrile | 1.457 | 1.037 | 0.210 | Black | O-B319 |
| O-ring Seals, Nitrile (Buna-N) | 320 | 4900-70 Nitrile | 1.520 | 1.100 | 0.210 | Black | O-B320 |
| O-ring Seals, Nitrile (Buna-N) | 321 | 4900-70 Nitrile | 1.582 | 1.162 | 0.210 | Black | O-B321 |
| O-ring Seals, Nitrile (Buna-N) | 322 | 4900-70 Nitrile | 1.645 | 1.225 | 0.210 | Black | O-B322 |
| O-ring Seals, Nitrile (Buna-N) | 323 | 4900-70 Nitrile | 1.707 | 1.287 | 0.210 | Black | O-B323 |
| O-ring Seals, Nitrile (Buna-N) | 324 | 4900-70 Nitrile | 1.770 | 1.350 | 0.210 | Black | O-B324 |
| O-ring Seals, Nitrile (Buna-N) | 325 | 4900-70 Nitrile | 1.895 | 1.475 | 0.210 | Black | O-B325 |
| O-ring Seals, Nitrile (Buna-N) | 326 | 4900-70 Nitrile | 2.020 | 1.600 | 0.210 | Black | O-B326 |
| O-ring Seals, Nitrile (Buna-N) | 327 | 4900-70 Nitrile | 2.145 | 1.725 | 0.210 | Black | O-B327 |
| O-ring Seals, Nitrile (Buna-N) | 328 | 4900-70 Nitrile | 2.270 | 1.850 | 0.210 | Black | O-B328 |
| O-ring Seals, Nitrile (Buna-N) | 329 | 4900-70 Nitrile | 2.395 | 1.975 | 0.210 | Black | O-B329 |
| O-ring Seals, Nitrile (Buna-N) | 330 | 4900-70 Nitrile | 2.520 | 2.100 | 0.210 | Black | O-B330 |
| O-ring Seals, Nitrile (Buna-N) | 331 | 4900-70 Nitrile | 2.645 | 2.225 | 0.210 | Black | O-B331 |
| O-ring Seals, Nitrile (Buna-N) | 332 | 4900-70 Nitrile | 2.770 | 2.350 | 0.210 | Black | O-B332 |
| O-ring Seals, Nitrile (Buna-N) | 333 | 4900-70 Nitrile | 2.895 | 2.475 | 0.210 | Black | O-B333 |
| O-ring Seals, Nitrile (Buna-N) | 334 | 4900-70 Nitrile | 3.020 | 2.600 | 0.210 | Black | O-B334 |
| O-ring Seals, Nitrile (Buna-N) | 335 | 4900-70 Nitrile | 3.145 | 2.725 | 0.210 | Black | O-B335 |
| O-ring Seals, Nitrile (Buna-N) | 336 | 4900-70 Nitrile | 3.270 | 2.850 | 0.210 | Black | O-B336 |
| O-ring Seals, Nitrile (Buna-N) | 337 | 4900-70 Nitrile | 3.395 | 2.975 | 0.210 | Black | O-B337 |
| O-ring Seals, Nitrile (Buna-N) | 338 | 4900-70 Nitrile | 3.520 | 3.100 | 0.210 | Black | O-B338 |
| O-ring Seals, Nitrile (Buna-N) | 339 | 4900-70 Nitrile | 3.645 | 3.225 | 0.210 | Black | O-B339 |
| O-ring Seals, Nitrile (Buna-N) | 340 | 4900-70 Nitrile | 3.770 | 3.350 | 0.210 | Black | O-B340 |
| O-ring Seals, Nitrile (Buna-N) | 341 | 4900-70 Nitrile | 3.895 | 3.475 | 0.210 | Black | O-B341 |
| O-ring Seals, Nitrile (Buna-N) | 342 | 4900-70 Nitrile | 4.020 | 3.600 | 0.210 | Black | O-B342 |
| O-ring Seals, Nitrile (Buna-N) | 343 | 4900-70 Nitrile | 4.145 | 3.725 | 0.210 | Black | O-B343 |
| O-ring Seals, Nitrile (Buna-N) | 344 | 4900-70 Nitrile | 4.270 | 3.850 | 0.210 | Black | O-B344 |
| O-ring Seals, Nitrile (Buna-N) | 345 | 4900-70 Nitrile | 4.395 | 3.975 | 0.210 | Black | O-B345 |
| O-ring Seals, Nitrile (Buna-N) | 346 | 4900-70 Nitrile | 4.520 | 4.100 | 0.210 | Black | O-B346 |
| O-ring Seals, Nitrile (Buna-N) | 347 | 4900-70 Nitrile | 4.645 | 4.225 | 0.210 | Black | O-B347 |
| O-ring Seals, Nitrile (Buna-N) | 348 | 4900-70 Nitrile | 4.770 | 4.350 | 0.210 | Black | O-B348 |
| O-ring Seals, Nitrile (Buna-N) | 349 | 4900-70 Nitrile | 4.895 | 4.475 | 0.210 | Black | O-B349 |
| O-ring Seals, Nitrile (Buna-N) | 350 | 4900-70 Nitrile | 5.020 | 4.600 | 0.210 | Black | O-B350 |
| O-ring Seals, Nitrile (Buna-N) | 351 | 4900-70 Nitrile | 5.145 | 4.725 | 0.210 | Black | O-B351 |
| O-ring Seals, Nitrile (Buna-N) | 352 | 4900-70 Nitrile | 5.270 | 4.850 | 0.210 | Black | O-B352 |
| O-ring Seals, Nitrile (Buna-N) | 353 | 4900-70 Nitrile | 5.395 | 4.975 | 0.210 | Black | O-B353 |
| O-ring Seals, Nitrile (Buna-N) | 354 | 4900-70 Nitrile | 5.520 | 5.100 | 0.210 | Black | O-B354 |
| O-ring Seals, Nitrile (Buna-N) | 355 | 4900-70 Nitrile | 5.645 | 5.225 | 0.210 | Black | O-B355 |
| O-ring Seals, Nitrile (Buna-N) | 356 | 4900-70 Nitrile | 5.770 | 5.350 | 0.210 | Black | O-B356 |
| O-ring Seals, Nitrile (Buna-N) | 357 | 4900-70 Nitrile | 5.895 | 5.475 | 0.210 | Black | O-B357 |
| O-ring Seals, Nitrile (Buna-N) | 358 | 4900-70 Nitrile | 6.020 | 5.600 | 0.210 | Black | O-B358 |
| O-ring Seals, Nitrile (Buna-N) | 359 | 4900-70 Nitrile | 6.145 | 5.725 | 0.210 | Black | O-B359 |
| O-ring Seals, Nitrile (Buna-N) | 360 | 4900-70 Nitrile | 6.270 | 5.850 | 0.210 | Black | O-B360 |
| O-ring Seals, Nitrile (Buna-N) | 361 | 4900-70 Nitrile | 6.395 | 5.975 | 0.210 | Black | O-B361 |
| O-ring Seals, Nitrile (Buna-N) | 362 | 4900-70 Nitrile | 6.645 | 6.225 | 0.210 | Black | O-B362 |
| O-ring Seals, Nitrile (Buna-N) | 363 | 4900-70 Nitrile | 6.895 | 6.475 | 0.210 | Black | O-B363 |
| O-ring Seals, Nitrile (Buna-N) | 364 | 4900-70 Nitrile | 7.145 | 6.725 | 0.210 | Black | O-B364 |
| O-ring Seals, Nitrile (Buna-N) | 365 | 4900-70 Nitrile | 7.395 | 6.975 | 0.210 | Black | O-B365 |
| O-ring Seals, Nitrile (Buna-N) | 366 | 4900-70 Nitrile | 7.645 | 7.225 | 0.210 | Black | O-B366 |
| O-ring Seals, Nitrile (Buna-N) | 367 | 4900-70 Nitrile | 7.895 | 7.475 | 0.210 | Black | O-B367 |
| O-ring Seals, Nitrile (Buna-N) | 368 | 4900-70 Nitrile | 8.145 | 7.725 | 0.210 | Black | O-B368 |
| O-ring Seals, Nitrile (Buna-N) | 369 | 4900-70 Nitrile | 8.395 | 7.975 | 0.210 | Black | O-B369 |
| O-ring Seals, Nitrile (Buna-N) | 370 | 4900-70 Nitrile | 8.645 | 8.225 | 0.210 | Black | O-B370 |
| O-ring Seals, Nitrile (Buna-N) | 371 | 4900-70 Nitrile | 8.895 | 8.475 | 0.210 | Black | O-B371 |
| O-ring Seals, Nitrile (Buna-N) | 372 | 4900-70 Nitrile | 9.145 | 8.725 | 0.210 | Black | O-B372 |
| O-ring Seals, Nitrile (Buna-N) | 373 | 4900-70 Nitrile | 9.395 | 8.975 | 0.210 | Black | O-B373 |
| O-ring Seals, Nitrile (Buna-N) | 374 | 4900-70 Nitrile | 9.645 | 9.225 | 0.210 | Black | O-B374 |
| O-ring Seals, Nitrile (Buna-N) | 375 | 4900-70 Nitrile | 9.895 | 9.475 | 0.210 | Black | O-B375 |
| O-ring Seals, Nitrile (Buna-N) | 376 | 4900-70 Nitrile | 10.145 | 9.725 | 0.210 | Black | O-B376 |
|
| O-ring Seals, Nitrile (Buna-N) | 377 | 4900-70 Nitrile | 10.395 | 9.975 | 0.210 | Black | O-B377 |
| O-ring Seals, Nitrile (Buna-N) | 378 | 4900-70 Nitrile | 10.895 | 10.475 | 0.210 | Black | O-B378 |
| O-ring Seals, Nitrile (Buna-N) | 379 | 4900-70 Nitrile | 11.395 | 10.975 | 0.210 | Black | O-B379 |
| O-ring Seals, Nitrile (Buna-N) | 380 | 4900-70 Nitrile | 11.895 | 11.475 | 0.210 | Black | O-B380 |
| O-ring Seals, Nitrile (Buna-N) | 381 | 4900-70 Nitrile | 12.395 | 11.975 | 0.210 | Black | O-B381 |
| O-ring Seals, Nitrile (Buna-N) | 382 | 4900-70 Nitrile | 13.395 | 12.975 | 0.210 | Black | O-B382 |
| O-ring Seals, Nitrile (Buna-N) | 383 | 4900-70 Nitrile | 14.395 | 13.975 | 0.210 | Black | O-B383 |
| O-ring Seals, Nitrile (Buna-N) | 384 | 4900-70 Nitrile | 15.395 | 14.975 | 0.210 | Black | O-B384 |
| O-ring Seals, Nitrile (Buna-N) | 385 | 4900-70 Nitrile | 16.375 | 15.955 | 0.210 | Black | O-B385 |
| O-ring Seals, Nitrile (Buna-N) | 386 | 4900-70 Nitrile | 17.375 | 16.955 | 0.210 | Black | O-B386 |
| O-ring Seals, Nitrile (Buna-N) | 387 | 4900-70 Nitrile | 18.375 | 17.955 | 0.210 | Black | O-B387 |
| O-ring Seals, Nitrile (Buna-N) | 388 | 4900-70 Nitrile | 19.375 | 18.955 | 0.210 | Black | O-B388 |
| O-ring Seals, Nitrile (Buna-N) | 389 | 4900-70 Nitrile | 20.375 | 19.955 | 0.210 | Black | O-B389 |
| O-ring Seals, Nitrile (Buna-N) | 390 | 4900-70 Nitrile | 21.375 | 20.955 | 0.210 | Black | O-B390 |
| O-ring Seals, Nitrile (Buna-N) | 391 | 4900-70 Nitrile | 22.375 | 21.955 | 0.210 | Black | O-B391 |
| O-ring Seals, Nitrile (Buna-N) | 392 | 4900-70 Nitrile | 23.360 | 22.940 | 0.210 | Black | O-B392 |
| O-ring Seals, Nitrile (Buna-N) | 393 | 4900-70 Nitrile | 24.360 | 23.940 | 0.210 | Black | O-B393 |
| O-ring Seals, Nitrile (Buna-N) | 394 | 4900-70 Nitrile | 25.360 | 24.940 | 0.210 | Black | O-B394 |
| O-ring Seals, Nitrile (Buna-N) | 395 | 4900-70 Nitrile | 26.360 | 25.940 | 0.210 | Black | O-B395 |
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