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100 Series




Image Model+ Item Name Stock Price Quantity Discounts
ST108S Solid Teflon Backup Ring ST108S

ST108S Solid Teflon Backup Ring

AS568-108 (0.086" W X 0.265"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
0
$3.64

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Quantity Discounts
1-48$3.64
49-289$2.73
290+$1.82
ST109S Solid Teflon Backup Ring ST109S

ST109S Solid Teflon Backup Ring

AS568-109 (0.086" W X 0.327"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
30
$3.64

Add:

Quantity Discounts
1-48$3.64
49-289$2.73
290+$1.82
ST110S Solid Teflon Backup Ring ST110S

ST110S Solid Teflon Backup Ring

AS568-110 (0.086" W X 0.39"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
428
$0.69

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Quantity Discounts
1-48$0.69
49-289$0.52
290+$0.35
ST111S Solid Teflon Backup Ring ST111S

ST111S Solid Teflon Backup Ring

AS568-111 (0.086" W X 0.452"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
600
$0.69

Add:

Quantity Discounts
1-48$0.69
49-289$0.52
290+$0.35
ST112S Solid Teflon Backup Ring ST112S

ST112S Solid Teflon Backup Ring

AS568-112 (0.086" W X 0.515"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
461
$0.71

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Quantity Discounts
1-46$0.71
47-281$0.53
282+$0.36
ST113S Solid Teflon Backup Ring ST113S

ST113S Solid Teflon Backup Ring

AS568-113 (0.086" W X 0.577"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
190
$0.76

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Quantity Discounts
1-43$0.76
44-263$0.57
264+$0.38
ST114S Solid Teflon Backup Ring ST114S

ST114S Solid Teflon Backup Ring

AS568-114 (0.086" W X 0.64"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
360
$0.78

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Quantity Discounts
1-42$0.78
43-256$0.59
257+$0.39
ST115S Solid Teflon Backup Ring ST115S

ST115S Solid Teflon Backup Ring

AS568-115 (0.086" W X 0.702"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
419
$0.84

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Quantity Discounts
1-39$0.84
40-238$0.63
239+$0.42
ST116S Solid Teflon Backup Ring ST116S

ST116S Solid Teflon Backup Ring

AS568-116 (0.086" W X 0.765"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
202
$0.84

Add:

Quantity Discounts
1-39$0.84
40-238$0.63
239+$0.42
ST117S Solid Teflon Backup Ring ST117S

ST117S Solid Teflon Backup Ring

AS568-117 (0.086" W X 0.831"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
190
$0.85

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Quantity Discounts
1-39$0.85
40-235$0.64
236+$0.43
ST118S Solid Teflon Backup Ring ST118S

ST118S Solid Teflon Backup Ring

Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing systems. The amount of this extrusion is affected by O-ring...
484
$0.97

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Quantity Discounts
1-34$0.97
35-206$0.73
207+$0.49
ST119S Solid Teflon Backup Ring ST119S

ST119S Solid Teflon Backup Ring

AS568-119 (0.086" W X 0.956"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
467
$0.97

Add:

Quantity Discounts
1-34$0.97
35-206$0.73
207+$0.49
ST120S Solid Teflon Backup Ring ST120S

ST120S Solid Teflon Backup Ring

AS568-120 (0.086" W X 1.018"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
497
$1.08

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Quantity Discounts
1-30$1.08
31-185$0.81
186+$0.54
ST121S Solid Teflon Backup Ring ST121S

ST121S Solid Teflon Backup Ring

AS568-121 (0.086" W X 1.081"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
259
$1.08

Add:

Quantity Discounts
1-30$1.08
31-185$0.81
186+$0.54
ST122S Solid Teflon Backup Ring ST122S

ST122S Solid Teflon Backup Ring

AS568-122 (0.086" W X 1.143"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
48
$1.08

Add:

Quantity Discounts
1-30$1.08
31-185$0.81
186+$0.54
ST123S Solid Teflon Backup Ring ST123S

ST123S Solid Teflon Backup Ring

AS568-123 (0.086" W X 1.206"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
6
$1.22

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Quantity Discounts
1-27$1.22
28-163$0.92
164+$0.61
ST124S Solid Teflon Backup Ring ST124S

ST124S Solid Teflon Backup Ring

AS568-124 (0.086" W X 1.268"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
48
$1.22

Add:

Quantity Discounts
1-27$1.22
28-163$0.92
164+$0.61
ST125S Solid Teflon Backup Ring ST125S

ST125S Solid Teflon Backup Ring

AS568-125 (0.086" W X 1.331"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
1
$1.27

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Quantity Discounts
1-26$1.27
27-157$0.95
158+$0.64
ST126S Solid Teflon Backup Ring ST126S

ST126S Solid Teflon Backup Ring

AS568-126 (0.086" W X 1.393"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
48
$1.48

Add:

Quantity Discounts
1-22$1.48
23-135$1.11
136+$0.74
ST127S Solid Teflon Backup Ring ST127S

ST127S Solid Teflon Backup Ring

AS568-127 (0.086" W X 1.456"ID X 0.053"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
48
$1.57

Add:

Quantity Discounts
1-21$1.57
22-127$1.18
128+$0.79


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