Metric Buna O-Rings

OneMonroe’s Metric Buna O-Rings are engineered to provide reliable sealing performance across a variety of industrial and commercial applications. Made from high-quality Buna-N (Nitrile) rubber, these O-rings are known for their excellent resistance to oils, fuels, and other petroleum-based products, making them ideal for use in environments where durable, leak-proof seals are essential. Buna-N’s resilient properties allow it to maintain its integrity even in challenging temperatures, ranging from -40°F to 250°F, ensuring these O-rings can withstand both low and high-stress conditions with ease. With a broad range of metric sizes available, OneMonroe ensures you’ll find the right fit for your exact specifications.

Our Metric Buna O-Rings are crafted to offer outstanding resistance to abrasion and tearing, providing long-lasting performance in rigorous applications. This makes them well-suited for automotive, aerospace, marine, and hydraulic systems, as well as in general maintenance and repair settings. The unique chemical composition of Buna-N allows these O-rings to endure pressure and friction over extended periods without compromising their sealing capabilities, making them a reliable choice for static and dynamic sealing tasks. Each O-ring is manufactured to precise industry standards, ensuring a dependable fit and function in every installation.

With OneMonroe, you’re getting more than just a product; you’re receiving a commitment to quality and expertise. Our team is dedicated to supporting your projects with high-quality metric Buna O-Rings that meet both industry standards and specific customer requirements. We provide technical support to help you select the best O-ring for your application, offering detailed product specifications and guidance. Trust OneMonroe to deliver durable, efficient, and cost-effective sealing solutions tailored to meet the demands of your unique projects.

For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.

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Cross Section Width (mm)

Durometer

Inside Diameter (mm)

Item #	IntegrationID	Type	Material	Cross Reference	Cross Section Width	Durometer	Inside Diameter	Product Guides

366 X 4 B-70	N/A 121999	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 366.00 mm	N/A Seal Guides
366 X 4 B-90	N/A 122000	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 366.00 mm	N/A Seal Guides
367 X 4 B-70	N/A 122001	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 367.00 mm	N/A Seal Guides
367 X 4 B-90	N/A 122002	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 367.00 mm	N/A Seal Guides
368 X 4 B-70	N/A 122003	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 368.00 mm	N/A Seal Guides
368 X 4 B-90	N/A 122004	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 368.00 mm	N/A Seal Guides
369 X 4 B-70	N/A 122005	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 369.00 mm	N/A Seal Guides
369 X 4 B-90	N/A 122006	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 369.00 mm	N/A Seal Guides
370 X 4 B-70	N/A 122007	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 370.00 mm	N/A Seal Guides
370 X 4 B-90	N/A 122008	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 370.00 mm	N/A Seal Guides
371 X 4 B-70	N/A 122009	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 371.00 mm	N/A Seal Guides
371 X 4 B-90	N/A 122010	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 371.00 mm	N/A Seal Guides
372 X 4 B-70	N/A 122011	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 372.00 mm	N/A Seal Guides
372 X 4 B-90	N/A 122012	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 372.00 mm	N/A Seal Guides
373 X 4 B-70	N/A 122013	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 373.00 mm	N/A Seal Guides
373 X 4 B-90	N/A 122014	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 373.00 mm	N/A Seal Guides
374 X 4 B-70	N/A 122015	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 374.00 mm	N/A Seal Guides
374 X 4 B-90	N/A 122016	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 374.00 mm	N/A Seal Guides
375x4.00B70	N/A 122017	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 375.00 mm	N/A Seal Guides
375 X 4 B-90	N/A 122018	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 375.00 mm	N/A Seal Guides
376 X 4 B-70	N/A 122019	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 376.00 mm	N/A Seal Guides
376 X 4 B-90	N/A 122020	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 376.00 mm	N/A Seal Guides
377 X 4 B-70	N/A 122021	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 377.00 mm	N/A Seal Guides
377 X 4 B-90	N/A 122022	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 90	N/A 377.00 mm	N/A Seal Guides
378 X 4 B-70	N/A 122023	N/A Metric Standard O-Ring	N/A Buna	N/A	N/A 4.00 mm	N/A 70	N/A 378.00 mm	N/A Seal Guides

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Item #

IntegrationID

Type

Material

Cross Reference

Cross Section Width

Durometer

Inside Diameter

Product Guides

Are you looking for a quote?

Experience

Capabilities

Values

Commitment

No Preference
0.70
0.80
0.81
0.84
0.90
1.00
1.02
1.15
1.19
1.20
1.25
1.27
1.30
1.42
1.50
1.52
1.60
1.63
1.78
1.80
1.83
1.90
1.92
1.98
10.00
2.00
2.08
2.18
2.20
2.21
2.40
2.46
2.50
2.55
2.62
2.65
2.66
2.70
2.93
2.95
250.00
3.00
3.10
3.20
3.50
3.53
3.55
3.60
4.00
4.20
4.50
4.76
5.00
5.30
5.33
5.50
5.70
5.80
6.00
6.20
6.35
6.50
6.90
6.99
7.00
7.50
8.00
8.30
8.40
9.00

No Preference
1.07
1.15
1.24
1.25
1.42
1.50
1.60
1.78
1.80
1.85
10.00
10.10
10.30
10.46
10.50
10.52
10.60
10.69
10.70
10.80
10.82
100.00
100.50
100.97
101.00
101.19
101.32
101.60
101.62
102.00
103.00
103.50
104.00
104.10
104.14
104.20
104.30
104.37
104.40
104.50
104.60
1044.00
105.00
106.00
107.00
107.32
107.54
107.62
107.67
108.00
109.00
109.10
109.20
109.30
109.40
109.50
109.54
11.00
11.10
11.11
11.30
11.50
11.60
11.70
11.80
11.89
11.91
110.00
110.49
110.72
110.74
111.00
111.50
111.60
112.00
113.00
113.67
113.89
113.97
114.00
114.02
114.20
114.30
114.40
114.50
114.60
114.70
115.00
116.00
116.84
117.00
117.07
117.10
117.48
118.00
119.00
119.20
119.30
119.40
119.50
119.60
12.00
12.07
12.10
12.29
12.30
12.37
12.40
12.42
12.50
12.60
12.70
120.00
120.02
120.24
120.32
120.37
120.65
121.00
122.00
123.00
123.19
123.42
123.44
123.83
124.00
124.30
124.40
124.50
124.60
125.00
125.30
125.60
126.00
126.37
126.50
126.59
126.67
126.72
127.00
128.00
129.00
129.20
129.30
129.40
129.50
129.54
129.60
129.77
13.00
13.10
13.20
13.25
13.30
13.46
13.50
13.60
13.64
13.87
13.94
130.00
130.18
131.00
131.50
131.60
132.00
132.20
132.72
132.94
133.00
133.02
133.07
133.20
133.35
134.00
134.20
134.30
134.40
134.50
134.60
135.00
135.76
135.89
136.00
136.12
136.53
137.00
138.00
138.94
139.00
139.07
139.20
139.29
139.30
139.37
139.40
139.50
139.60
139.70
14.00
14.10
14.30
14.50
14.60
14.80
140.00
140.50
141.00
142.00
142.11
142.24
142.47
142.88
143.00
144.00
144.10
144.20
144.30
144.40
144.50
144.60
145.00
145.29
145.42
145.64
145.72
146.00
146.05
147.00
148.00
148.46
148.50
148.59
148.82
149.00
149.10
149.20
149.23
149.30
149.50
149.60
15.00
15.08
15.10
15.24
15.30
15.47
15.50
15.54
15.60
15.80
15.88
15.90
150.00
151.00
151.64
151.77
151.99
152.00
152.07
153.00
154.00
154.10
154.30
154.50
154.81
155.00
155.50
155.60
156.00
157.00
158.00
158.12
158.34
158.42
158.82
159.00
159.10
159.30
159.50
16.00
16.10
16.30
16.36
16.50
16.60
16.81
16.90
160.00
161.00
161.16
161.30
161.60
161.90
162.00
163.00
164.00
164.10
164.20
164.30
164.34
164.47
164.50
164.69
164.77
165.00
166.00
166.70
167.00
167.51
167.70
168.00
168.30
169.00
169.10
169.30
169.50
17.00
17.04
17.10
17.12
17.17
17.30
17.46
17.50
17.60
17.80
17.86
17.93
170.00
170.69
170.82
171.00
171.04
171.12
172.00
173.00
173.87
174.00
174.10
174.20
174.30
174.50
174.60
175.00
176.00
177.00
177.17
177.39
177.47
178.00
179.00
179.10
179.30
179.50
18.00
18.10
18.20
18.30
18.40
18.42
18.50
18.60
18.64
18.72
18.77
180.00
181.00
182.00
183.00
183.50
183.52
183.74
183.82
184.00
184.10
184.30
184.50
185.00
186.00
187.00
187.30
188.00
189.00
189.10
189.20
189.30
189.50
189.87
19.00
19.05
19.10
19.15
19.18
19.20
19.30
19.50
19.60
19.80
19.99
190.00
190.09
190.17
191.00
191.20
192.00
193.00
193.70
194.00
194.10
194.20
194.30
194.50
195.00
196.00
196.22
196.44
196.52
197.00
198.00
199.00
199.10
199.20
199.30
199.50
2.00
2.06
2.20
2.24
2.40
2.50
2.54
2.57
2.60
2.70
2.75
2.80
2.84
2.90
20.00
20.22
20.29
20.30
20.35
20.50
20.64
20.80
200.00
201.00
202.00
202.57
202.79
202.87
203.00
203.50
204.00
204.10
204.20
204.50
205.00
206.00
207.00
208.00
208.50
208.92
209.00
209.10
209.14
209.20
209.22
209.30
209.50
21.00
21.10
21.20
21.30
21.47
21.50
21.59
21.60
21.70
21.80
21.82
21.89
21.90
21.92
21.95
210.00
211.00
212.00
213.00
214.00
214.50
215.00
215.27
215.49
215.57
216.00
217.00
218.00
219.00
219.10
219.30
219.50
22.00
22.10
22.20
22.23
22.30
22.40
22.50
22.60
22.80
220.00
221.00
221.62
221.84
221.92
222.00
222.50
223.00
224.00
224.50
225.00
226.00
227.00
227.97
228.00
228.19
228.27
229.00
229.10
229.30
229.50
23.00
23.16
23.30
23.39
23.47
23.50
23.52
23.60
23.70
23.81
230.00
231.00
232.00
233.00
234.00
234.10
234.30
234.32
234.50
234.54
234.62
235.00
236.00
237.00
237.50
238.00
239.00
239.10
239.30
239.50
24.00
24.20
24.30
24.40
24.50
24.60
24.70
24.77
24.99
240.00
240.67
240.89
240.97
241.00
242.00
243.00
244.00
244.50
245.00
246.00
247.00
247.02
247.24
247.32
248.00
249.00
249.10
249.30
249.50
25.00
25.04
25.07
25.10
25.12
25.20
25.30
25.50
25.60
25.70
25.80
250.00
250.37
251.00
252.00
253.00
253.37
253.59
254.00
254.50
255.00
256.00
257.00
258.00
259.00
259.30
259.50
259.70
26.00
26.20
26.34
26.50
26.57
26.59
26.64
26.70
260.00
261.00
262.00
263.00
264.00
264.50
265.00
266.00
266.07
266.29
267.00
268.00
269.00
269.20
269.30
269.50
27.00
27.10
27.30
27.50
27.60
27.70
27.80
27.94
270.00
271.00
272.00
272.40
273.00
274.00
274.50
275.00
276.00
277.00
278.00
278.77
278.99
279.00
279.30
279.50
28.00
28.17
28.24
28.30
28.40
28.50
28.70
280.00
281.00
282.00
283.00
284.00
284.50
285.00
285.10
286.00
287.00
288.00
289.00
289.30
289.50
29.00
29.10
29.20
29.30
29.40
29.50
29.51
29.60
29.70
29.74
29.82
29.87
29.90
290.00
291.00
291.47
291.69
292.00
293.00
294.00
294.50
295.00
296.00
297.00
297.80
298.00
299.00
299.30
299.50
3.00
3.10
3.15
3.17
3.20
3.25
3.30
3.40
3.50
3.55
3.60
3.63
3.68
3.70
3.75
3.80
3.91
30.00
30.20
30.30
30.50
30.70
30.80
300.00
301.00
302.00
303.00
304.00
304.17
304.39
305.00
306.00
307.00
308.00
309.00
31.00
31.12
31.20
31.34
31.42
31.47
31.50
31.60
31.70
31.80
310.00
310.50
311.00
312.00
313.00
314.00
314.50
315.00
316.00
316.87
317.00
318.00
319.00
319.20
319.30
319.50
32.00
32.10
32.20
32.50
32.69
32.92
32.99
320.00
321.00
321.50
322.00
323.00
323.20
324.00
325.00
326.00
327.00
328.00
329.00
329.30
329.55
329.57
329.79
33.00
33.05
33.30
33.50
33.70
330.00
331.00
332.00
333.00
334.00
334.50
335.00
335.90
336.00
337.00
338.00
339.00
339.30
339.50
34.00
34.10
34.20
34.29
34.40
34.42
34.50
34.52
34.59
34.60
34.65
34.70
340.00
341.00
342.00
342.27
343.00
344.00
345.00
346.00
347.00
348.00
349.00
349.30
35.00
35.10
35.20
35.50
35.60
35.70
350.00
351.00
352.00
353.00
354.00
354.50
354.97
355.00
355.19
356.00
357.00
358.00
359.00
359.30
359.50
36.00
36.09
36.17
36.20
36.27
36.50
360.00
361.00
362.00
363.00
364.00
365.00
366.00
367.00
367.67
368.00
369.00
37.00
37.10
37.20
37.30
37.40
37.47
37.50
37.60
37.69
37.70
37.77
37.82
370.00
371.00
372.00
373.00
374.00
374.50
375.00
376.00
377.00
378.00
379.00
379.30
38.00
38.50
38.70
380.00
380.37
380.59
381.00
382.00
383.00
384.00
384.50
385.00
386.00
387.00
388.00
389.00
39.00
39.20
39.34
39.40
39.45
39.50
39.60
39.70
390.00
391.00
392.00
393.00
393.07
394.00
395.00
396.00
397.00
398.00
399.00
399.30
399.50
4.00
4.10
4.20
4.30
4.32
4.34
4.42
4.47
4.50
4.60
4.70
4.80
4.87
4.90
40.00
40.20
40.50
40.64
40.70
40.87
40.94
400.00
401.00
402.00
403.00
404.00
405.00
405.26
406.00
407.00
408.00
409.00
41.00
41.20
41.26
41.28
41.40
41.50
41.60
41.70
410.00
411.00
412.00
413.00
414.00
415.00
416.00
417.00
417.96
418.00
419.00
419.30
42.00
42.10
42.20
42.50
42.52
42.86
420.00
421.00
422.00
422.20
423.00
424.00
425.00
425.50
426.00
427.00
428.00
429.00
43.00
43.40
43.50
43.69
43.70
43.82
430.00
430.66
431.00
432.00
433.00
434.00
435.00
436.00
437.00
438.00
439.00
439.30
44.00
44.04
44.12
44.17
44.20
44.30
44.40
44.45
44.50
44.60
44.70
440.00
441.00
442.00
443.00
443.36
444.00
445.00
446.00
447.00
448.00
449.00
449.20
45.00
45.20
45.30
45.50
45.59
45.69
45.70
45.84
450.00
451.00
452.00
453.00
454.00
455.00
456.00
456.06
457.00
457.20
458.00
459.00
459.30
46.00
46.04
46.20
46.99
460.00
461.00
462.00
463.00
464.00
465.00
466.00
467.00
468.00
468.76
469.00
47.00
47.20
47.22
47.29
47.35
47.50
47.60
47.62
47.70
470.00
471.00
472.00
473.00
474.00
475.00
476.00
477.00
478.00
479.00
479.30
48.00
48.70
48.90
480.00
481.00
481.46
482.00
483.00
484.00
485.00
486.00
487.00
488.00
489.00
49.00
49.20
49.30
49.40
49.50
49.60
49.70
490.00
491.00
491.49
492.00
493.00
494.00
494.16
494.67
495.00
496.00
497.00
498.00
499.00
499.30
5.00
5.10
5.15
5.23
5.28
5.30
5.36
5.50
5.60
5.80
5.94
50.00
50.17
50.39
50.47
50.50
50.52
50.80
500.00
504.00
505.00
506.86
508.00
51.00
51.10
51.20
51.50
51.60
510.00
515.00
516.00
518.50
519.30
52.00
52.07
52.20
52.30
52.40
52.50
52.60
520.00
524.50
529.30
53.00
53.09
53.34
53.50
53.57
53.64
53.70
53.97
530.00
532.26
54.00
54.20
54.30
54.40
54.50
54.60
540.00
544.00
545.00
545.47
549.00
55.00
55.20
55.25
55.30
55.50
55.56
55.60
552.00
555.00
557.66
56.00
56.20
56.52
56.74
56.82
56.87
560.00
569.00
57.00
57.15
57.20
57.60
570.00
575.00
579.00
58.00
58.42
58.74
580.00
582.65
59.00
59.20
59.30
59.36
59.40
59.50
59.60
59.69
59.70
59.92
59.99
594.00
594.30
596.27
6.00
6.02
6.07
6.10
6.30
6.35
6.40
6.50
6.60
6.75
6.80
6.90
60.00
60.05
60.32
600.00
608.10
61.00
61.20
61.50
61.60
61.90
610.00
615.00
62.00
62.20
62.30
62.50
62.60
62.87
63.00
63.09
63.17
63.22
63.50
630.00
633.50
638.00
64.00
64.20
64.30
64.40
64.50
64.60
64.77
647.07
65.00
65.10
650.00
658.85
658.88
66.00
66.04
66.27
66.34
66.40
66.50
66.60
66.67
67.00
67.10
67.20
67.60
67.95
670.00
675.16
68.00
68.26
683.00
69.00
69.20
69.22
69.30
69.40
69.44
69.50
69.52
69.57
69.60
69.85
699.00
7.00
7.10
7.20
7.30
7.50
7.52
7.59
7.60
7.65
7.80
7.93
7.94
70.00
70.20
70.50
700.00
702.66
71.00
71.12
71.20
71.44
72.00
72.20
72.30
72.39
72.62
72.69
72.75
724.00
725.00
73.00
73.02
730.50
732.50
74.00
74.20
74.30
74.40
74.50
74.60
74.63
745.00
75.00
75.57
75.79
75.87
75.92
76.00
760.00
77.00
77.20
77.50
78.00
78.50
78.74
78.97
782.00
79.00
79.20
79.30
79.40
79.50
79.60
79.73
8.00
8.10
8.30
8.35
8.50
8.60
8.70
8.73
8.76
8.80
8.90
8.92
80.00
80.60
800.00
81.00
81.20
81.50
81.92
82.00
82.14
82.20
82.22
82.27
82.50
83.00
83.80
836.50
84.00
84.10
84.20
84.30
84.40
84.50
84.60
85.00
85.09
85.32
85.34
86.00
86.50
87.00
87.20
87.50
88.00
88.27
88.49
88.57
88.62
880.00
89.00
89.10
89.20
89.30
89.40
89.50
89.60
89.69
890.00
9.00
9.10
9.13
9.19
9.20
9.25
9.30
9.34
9.50
9.52
9.53
9.60
9.80
9.90
90.00
91.00
91.44
91.67
91.70
92.00
92.20
92.50
92.75
93.00
93.50
94.00
94.10
94.20
94.30
94.40
94.50
94.60
94.62
94.84
94.92
94.97
95.00
96.00
96.60
97.00
97.20
97.50
97.79
98.00
98.02
98.05
99.00
99.10
99.20
99.30
99.40
99.50
99.60