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ST Style Urethane Wiper Ring, 3.50 Inch Rod Diameter, 4.00 Inch Wiper OD, 1/4 Inch Base Thickness

Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Rod Diameter A 3.50	Supplier Part Number ST-350	Thickness (in) 1/4	Product Weight 0.04 lbs	Alternate Part Numbers Alternate Part Number C1DL46, Alternate Part Number MI-00967877, Alternate Part Number MINO-00407X20028, Alternate Part Number ST-3.50, Alternate Part Number ST350

Product Questions & Answers 3

Product Questions & Answers

got a cylinder rod that mics out at 3.50, is this the right wiper or am i missin somethin

Question by: Ralph P on Jul 8, 2025, 6:12 PM

Match the rod diameter and the wiper OD to your gland. This ST style ring is sized for a 3.50 inch rod diameter, has a 4.00 inch wiper OD, and a 1/4 inch base thickness.

Answer by: Customer Support on Jul 10, 2025, 6:30 AM

I'm replacing a wiper ring on an older hydraulic cylinder. What's the actual rod size this is meant for? Just wanna double-check.

Question by: Connie T on Feb 15, 2026, 4:28 PM

This wiper ring is designed to fit a 3.5-inch rod diameter.

Answer by: Customer Support on Feb 17, 2026, 6:14 AM

Got a cylinder with a 3.5 inch rod that needs a new wiper, this the right size to replace it?

Question by: Dwight K on Mar 31, 2026, 1:52 PM

For a 3.50-inch rod diameter, yes, this is the correct fit. The outer wiper diameter runs 4.00 inches with a 1/4-inch base thickness, so as long as your housing is machined to accept those dimensions, it should drop right in without any modification.

Answer by: Customer Support on Apr 1, 2026, 6:29 PM

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Model Number	Rod Diameter A	Wiper O.D. B	Thickness (in)
ST-125	1.25	1.625	3/16
ST-175	1.75	2.125	3/16
ST-200	2	2.5	1/4
ST-300	3	3.5	1/4
ST-100	1	1.375	3/16
ST-112	1.125	1.5	3/16
ST-118	0.188	1.563	3/16
ST-137	1.375	1.75	3/16
ST-150	1.5	1.875	3/16
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ST-187	1.875	2.25	3/16
ST-212	2.125	2.625	1/4
ST-225	2.25	2.75	1/4
ST-250	2.5	3	1/4
ST-275	2.75	3.25	1/4
ST-325	3.25	3.75	1/4
ST-350	3.5	4	1/4
ST-375	3.75	4.25	1/4
ST-400	4	4.5	1/4
ST-450	4.5	5.25	3/8
ST-475	4.75	5.5	3/8
ST-50	0.5	0.75	1/8
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ST-75	0.75	1.125	3/16
ST-87	0.875	1.25	3/16