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HERCULES RCW-90URE-1-1/4X1-3/4X5/16

Alternate Part Numbers Alternate Part Number C1ML42, Alternate Part Number MCU-1250-G, Alternate Part Number MI-01810831, Alternate Part Number MINO-00407Q30603	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Supplier Part Number MCU-1250-D	Product Weight 0.03 lbs

Product Questions & Answers 2

Product Questions & Answers

got a groove that takes a 1-1/4 ID, 1-3/4 OD seal with a 5/16 cross section. is this the right one for that?

Question by: Earl J on Mar 15, 2026, 9:54 PM

Fit comes down to those three dimensions, and this RCW-90URE seal is 1-1/4 inch inside diameter, 1-3/4 inch outside diameter, with a 5/16 inch cross section, so it matches that size callout.

Answer by: Customer Support on Mar 17, 2026, 6:57 AM

Got a cylinder that calls for a 1-1/4 bore seal with a 1-3/4 OD and 5/16 cross-section. That match up with what this Hercules seal is?

Question by: Terry F on Jul 10, 2025, 7:24 PM

those numbers line up exactly. The RCW-90URE runs a 1-1/4 inch inside diameter, 1-3/4 inch outside diameter, and a 5/16 inch cross-section, so if your cylinder spec matches that, you're looking at the right part. Hercules also lists a handful of alternate part numbers for this one including C1ML42, MCU-1250-G, MI-01810831, and MINO-00407Q30603, which can help if you're cross-referencing an old part tag or a competitor number.

Answer by: Customer Support on Jul 12, 2025, 8:14 AM