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ST Style Urethane Wiper Ring, 3.75 Inch Rod Diameter, 4.25 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 3.75	Supplier Part Number ST-375	Thickness (in) 1/4	Product Weight 0.04 lbs	Alternate Part Numbers Alternate Part Number C1DL48

Product Questions & Answers 2

Product Questions & Answers

Got a cylinder with a 3.75 inch rod and need a new wiper, this the right part?

Question by: Denise J on Nov 2, 2025, 8:13 PM

For a 3.75 inch rod diameter, yes, this is the correct fit. The outer diameter on this wiper ring comes in at 4.25 inches with a 1/4 inch base thickness, so those are the other dimensions you'll want to confirm against your housing before ordering. As long as your bore and groove match up to those numbers, you're in good shape.

Answer by: Customer Support on Nov 4, 2025, 8:12 AM

got a 3.75 rod, will this ST-375 wiper ring match up or am i gonna be fightin it

Question by: Randy G on Nov 26, 2025, 6:38 AM

The key numbers are a 3.75 inch rod diameter, a 4.25 inch wiper outside diameter, and a 1/4 inch base thickness. If your gland is set up for those dimensions in an ST style wiper ring, ST-375 is the matching size.

Answer by: Customer Support on Nov 27, 2025, 7:41 PM

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Model Number	Rod Diameter A	Wiper O.D. B	Thickness (in)
ST-125	1.25	1.625	3/16
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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
ST-162	1.625	2	3/16
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