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4.5mm CS

Buna-N / Nitrile Metric O-Rings 70 Duro (NBR):

A general purpose, sulfur-cured Buna-N Nitrile O-Ring, the most commonly used elastomer for sealing products. Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. More than 50% of the Orings sold are Buna-N Nitrile Orings, commonly used in hydraulic/pneumatic motors, cylinders, pumps and valves.

O-Ring Dimensions are defined by the cross section (CS) and the inside diameter (ID).

Size not listed, special requirements or large quantities please click this link to Request a Price Quote.




Image Model+ Item Name Stock Price Quantity Discounts
4.5mm X 6mm Buna-N 70 Metric O-ring N4.50X006

4.5mm X 6mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
112
$0.26

Add:
Min:  2
Quantity Discounts
2-124$0.26
125-769$0.20
770+$0.13
4.5mm X 8mm Buna-N 70 Metric O-ring N4.50X008

4.5mm X 8mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
5
$0.26

Add:
Min:  2
Quantity Discounts
2-124$0.26
125-769$0.20
770+$0.13
4.5mm X 9mm Buna-N 70 Metric O-ring N4.50X009

4.5mm X 9mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
863
$0.26

Add:
Min:  2
Quantity Discounts
2-124$0.26
125-769$0.20
770+$0.13
4.5mm X 10mm Buna-N 70 Metric O-ring N4.50X010

4.5mm X 10mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
0
$0.26

Add:
Min:  962
Quantity Discounts
962-4,999$0.26
5,000-19,230$0.20
19,231+$0.13
4.5mm X 11mm Buna-N 70 Metric O-ring N4.50X011

4.5mm X 11mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
162
$0.27

Add:
Min:  2
Quantity Discounts
2-124$0.27
125-714$0.20
715+$0.14
4.5mm X 12mm Buna-N 70 Metric O-ring N4.50X012

4.5mm X 12mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
160
$0.28

Add:
Min:  2
Quantity Discounts
2-119$0.28
120-714$0.21
715+$0.14
4.5mm X 13mm Buna-N 70 Metric O-ring N4.50X013

4.5mm X 13mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
42
$0.29

Add:
Min:  2
Quantity Discounts
2-113$0.29
114-666$0.22
667+$0.15
4.5mm X 15mm Buna-N 70 Metric O-ring N4.50X015

4.5mm X 15mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
1556
$0.31

Add:
Min:  2
Quantity Discounts
2-108$0.31
109-624$0.23
625+$0.16
4.5mm X 15.5mm Buna-N 70 Metric O-ring N4.50X015.5

4.5mm X 15.5mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
43
$0.33

Add:
Min:  2
Quantity Discounts
2-60$0.33
61-357$0.25
358+$0.17
4.5mm X 16mm Buna-N 70 Metric O-ring N4.50X016

4.5mm X 16mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
526
$0.34

Add:
Min:  2
Quantity Discounts
2-96$0.34
97-588$0.26
589+$0.17
4.5mm X 17mm Buna-N 70 Metric O-ring N4.50X017

4.5mm X 17mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
990
$0.36

Add:
Min:  2
Quantity Discounts
2-92$0.36
93-555$0.27
556+$0.18
4.5mm X 18mm Buna-N 70 Metric O-ring N4.50X018

4.5mm X 18mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
108
$0.38

Add:
Min:  2
Quantity Discounts
2-86$0.38
87-526$0.29
527+$0.19
4.5mm X 19mm Buna-N 70 Metric O-ring N4.50X019

4.5mm X 19mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
28
$0.39

Add:
Min:  2
Quantity Discounts
2-86$0.39
87-499$0.29
500+$0.20
4.5mm X 20mm Buna-N 70 Metric O-ring N4.50X020

4.5mm X 20mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
164
$0.41

Add:
Min:  2
Quantity Discounts
2-80$0.41
81-476$0.31
477+$0.21
4.5mm X 21mm Buna-N 70 Metric O-ring N4.50X021

4.5mm X 21mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
44
$0.43

Add:
Min:  2
Quantity Discounts
2-78$0.43
79-454$0.32
455+$0.22
4.5mm X 21.5mm Buna-N 70 Metric O-ring N4.50X021.5

4.5mm X 21.5mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
78
$0.44

Add:
Min:  2
Quantity Discounts
2-75$0.44
76-454$0.33
455+$0.22
4.5mm X 22mm Buna-N 70 Metric O-ring N4.50X022

4.5mm X 22mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
65
$0.46

Add:
Min:  2
Quantity Discounts
2-71$0.46
72-434$0.35
435+$0.23
4.5mm X 23mm Buna-N 70 Metric O-ring N4.50X023

4.5mm X 23mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
39
$0.47

Add:
Min:  2
Quantity Discounts
2-71$0.47
72-416$0.35
417+$0.24
4.5mm X 24mm Buna-N 70 Metric O-ring N4.50X024

4.5mm X 24mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
108
$0.49

Add:
Min:  2
Quantity Discounts
2-67$0.49
68-399$0.37
400+$0.25
4.5mm X 25mm Buna-N 70 Metric O-ring N4.50X025

4.5mm X 25mm Buna-N 70 Metric O-ring

Cross Section "CS" X Inside Diameter "ID" Metric O-Rings Buna-N 70 Duro (NBR): The most commonly used elastomer for sealing...
0
$0.50

Add:
Min:  500
Quantity Discounts
500-2,631$0.50
2,632-9,999$0.38
10,000+$0.25


What are the most common O-ring compounds?

We stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Buna-N O-Rings / Nitrile O-Rings / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.
AS-568 Buna-N O-Rings | Metric Buna-N O-Rings

Viton® O-Rings / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.
AS-568 Viton® O-Rings | Metric Viton® O-Rings

Ethylene-Propylene / EPDM O-Rings: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.
AS-568 EPDM O-Rings | Metric EPDM O-Rings

Silicone O-Rings / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.
AS-568 Silicone O-Rings | Metric Silicone O-Rings

Neoprene® O-Rings / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.
AS-568 Neoprene® O-Rings