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D-Ring for Caterpillar Flanges, 1.25 Inch Flange, Buna-N

Dash Size -20	Brand Danfoss Power Solutions (II LLC Aeroquip)	Brand Aeroquip	Pack Size 1.00	UOM EA	Flange Size 1.25	I.D. 1.5 in	Materials Buna-N	O.D. 1.77 in	Supplier Part Number FF90319-20	Temperature Range -40 to +212	Thread Sealant No	Product Weight 0.01 lbs	Alternate Part Numbers Alternate Part Number C1EW78, Alternate Part Number MI-04149481, Alternate Part Number MINO-00015X00146

Product Questions & Answers 3

Product Questions & Answers

Is this the right size d-ring for a Cat flange that's 1 1/4 inch? Just wanna be double-dog sure before I order it.

Question by: Wade H on Dec 7, 2025, 1:30 PM

It's made to fit a 1.25-inch Caterpillar flange, with an inner diameter of 1.5 inches and an outer diameter of 1.77 inches. The width is 0.14 inches.

Answer by: Customer Support on Dec 9, 2025, 8:50 AM

got a 1.25 split flange on a Cat setup, is this the right d-ring size or am i gonna be fighting leaks

Question by: Shane R on Dec 12, 2025, 6:55 AM

For a 1.25 inch Caterpillar flange, this D-ring is sized to match. It has a 1.50 inch ID, 1.77 inch OD, and 0.14 inch width, which are the key dimensions for the seal in that flange size.

Answer by: Customer Support on Dec 13, 2025, 9:50 PM

Got a 1.25 inch Caterpillar flange that needs a new o-ring, will this one actually fit right, or do I need to double-check the dimensions first?

Question by: Marvin B on Apr 13, 2025, 3:54 PM

For a 1.25 inch Caterpillar flange, the dimensions line up. The inner diameter is 1.5 inches, outer diameter is 1.77 inches, and the width runs 0.14 inches. Those measurements are specific to that flange size, so if you are replacing a worn seal on a 1.25 inch CAT flange, this is the correct part.

Answer by: Customer Support on Apr 15, 2025, 10:59 AM

Similar Products

Model Number	Flange Size	Dash Size	Materials	Temperature Range	I.D.	Width (E)	O.D.
FF90319-12	0.75	-12	Buna-N	-40 to +212	1 in	0.14	1.27 in
FF90319-16	1	-16	Buna-N	-40 to +212	1.25 in	0.14	1.52 in
FF90319-20	1.25	-20	Buna-N	-40 to +212	1.5 in	0.14	1.77 in