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90A Durometer Urethane Back-Up Rings -122 Dash Size, Per Pack
Alternate Part Numbers
Alternate Part Number
C1BU21 ,
Alternate Part Number
MI-01260105 ,
Alternate Part Number
MINO-00407X80012
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Supplier Part Number
575-122
What's the deal with the temperature these rings can handle?
Question by: Shawn E on Aug 29, 2025, 10:05 AM
Urethane models are good from -65°F up to 220°F.
Answer by: Customer Support on Aug 31, 2025, 6:22 AM
These back-up rings stretch for install and then snap back to size, right? Trying to figure out if I need any special tools to get em seated proper.
Question by: Norm F on Jun 16, 2025, 5:29 PM
No tooling required for installation. The urethane material is flexible enough to stretch over the gland and spring back to its original shape once in place. That recovery is actually one of the practical advantages of urethane over stiffer materials like Teflon. Just make sure your O-ring groove dimensions correspond to the dash size, since these back-up rings are sized to match standard O-ring dash sizes.
Answer by: Customer Support on Jun 18, 2025, 4:16 PM
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575-239
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575-242
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575-243
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575-245
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575-246
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575-247
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575-248
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575-253
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575-341
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575-344
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575-345
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575-347
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575-348
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575-349
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575-350
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575-429
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