ISO Flange Centering Ring Buna-N O-Rings

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Overview

These Buna-N O-rings can be used as spares or to replace the O-rings on our ISO centering ring seal assemblies. Buna-N (N674-70 compound) is black colored elastomer with a bakeout rating of 80°C and is less expensive and seals easier than lasts longer than Buna-N.

Replacement Buna-N O-rings for ISO centering rings
80 °C maximum temperature
Keep as spares for increased up-time

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Products

Compare	Description	Compatibility	rankScore	Flange Size	Inner Diameter	Thickness	Availability	Price
100761906 Buna-N O-Ring, NW63 Size ISO-MF Vacuum Flange, 2-336 O-Ring Size $1.88 7 Weeks	100761906 Buna-N O-Ring, NW63 Size ISO-MF Vacuum Flange, 2-336 O-Ring Size	UNIVERSAL	1.0	NW63	2.85 in. (72 mm)	0.21 in. (5 mm)	7 Weeks	$1.88
100761908 Buna-N O-Ring, NW80 Size ISO-MF Vacuum Flange, 2-340 O-Ring Size $2.98 7 Weeks	100761908 Buna-N O-Ring, NW80 Size ISO-MF Vacuum Flange, 2-340 O-Ring Size	UNIVERSAL	1.0	NW80	3.35 in. (85 mm)	0.21 in. (5 mm)	7 Weeks	$2.98
100761910 Buna-N O-Ring, NW100 Size ISO-MF Vacuum Flange, 2-346 O-Ring Size $3.19 7 Weeks	100761910 Buna-N O-Ring, NW100 Size ISO-MF Vacuum Flange, 2-346 O-Ring Size	UNIVERSAL	1.0	NW100	4.10 in. (104 mm)	0.21 in. (5 mm)	7 Weeks	$3.19
100761916 Buna-N O-Ring, NW160 Size ISO-MF Vacuum Flange, 2-361 O-Ring Size $3.75 7 Weeks	100761916 Buna-N O-Ring, NW160 Size ISO-MF Vacuum Flange, 2-361 O-Ring Size	UNIVERSAL	1.0	NW160	5.98 in. (152 mm)	0.21 in. (5 mm)	7 Weeks	$3.75
100761920 Buna-N O-Ring, NW200 Size ISO-MF Vacuum Flange, 2-371 O-Ring Size $6.84 Contact Us	100761920 Buna-N O-Ring, NW200 Size ISO-MF Vacuum Flange, 2-371 O-Ring Size	UNIVERSAL	1.0	NW200	8.48 in. (215 mm)	0.21 in. (5 mm)	Contact Us	$6.84
100761925 Buna-N O-Ring, NW250 Size ISO-MF Vacuum Flange, 2-378 O-Ring Size $8.38 7 Weeks	100761925 Buna-N O-Ring, NW250 Size ISO-MF Vacuum Flange, 2-378 O-Ring Size	UNIVERSAL	1.0	NW250	10.48 in. (266 mm)	0.21 in. (5 mm)	7 Weeks	$8.38
100761932 Buna-N O-Ring, NW320 Size ISO-MF Vacuum Flange, 2-454 O-Ring Size $26 Contact Us	100761932 Buna-N O-Ring, NW320 Size ISO-MF Vacuum Flange, 2-454 O-Ring Size	UNIVERSAL	1.0	NW320	12.48 in. (317 mm)	0.28 in. (7 mm)	Contact Us	$26
100761940 Buna-N O-Ring, NW400 Size ISO-MF Vacuum Flange, 2-460 O-Ring Size $26 7 Weeks	100761940 Buna-N O-Ring, NW400 Size ISO-MF Vacuum Flange, 2-460 O-Ring Size	UNIVERSAL	1.0	NW400	15.48 in. (393 mm)	0.28 in. (7 mm)	7 Weeks	$26
100761950 Buna-N O-Ring, NW500 Size ISO-MF Vacuum Flange, 2-468 O-Ring Size $63 7 Weeks	100761950 Buna-N O-Ring, NW500 Size ISO-MF Vacuum Flange, 2-468 O-Ring Size	UNIVERSAL	1.0	NW500	19.46 in. (494 mm)	0.28 in. (7 mm)	7 Weeks	$63
100761963 Buna-N O-Ring, NW630 Size ISO-BF Vacuum Flange, 2-474 O-Ring Size $58 7 Weeks	100761963 Buna-N O-Ring, NW630 Size ISO-BF Vacuum Flange, 2-474 O-Ring Size	UNIVERSAL	1.0	NW630	24.94 in. (634 mm)	0.28 in. (7 mm)	7 Weeks	$58

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Notes:

Please see o-ring schematic for dimension callouts.

Specifications

Component Type

O-Ring
Series

Series 76

Flange Type

ISO-MF: (NW63 to NW500)
ISO-BF: NW630
Material

Buna-N

Specifications

Component Type

O-Ring
Series

Series 76

Flange Type

ISO-MF: (NW63 to NW500)
ISO-BF: NW630
Material

Buna-N

Features

Elastomer Seal Comparison

	Buna-N	Viton
Compound	N674-70	V747-75
Color	Black	Black
Bakeout	80°C	150°C
Benefits	Seals easier, lower cost	High temperature, lasts longer

Viton® is recommended where temperatures, chemical resistance or long installed life make it beneficial. Use Buna-N where temperatures are moderate, and installed useful life is consistent with this material. The centering ring is available in stainless steel or aluminum. Use stainless steel where chemical resistance is needed. Flanges and seals are designed to be tightened to metal to metal contact.