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Cast Iron Piston Ring, 7.00 Inch OD, 0.249 Inch Width, 0.24 Inch Wall Thickness

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Description & Features

This Hercules Sealing Products cast iron piston ring is suitable for use in hydraulic cylinders and other reciprocating mechanisms. The 7.00-inch outside diameter ring has a width of 0.249 inches and a wall thickness of 0.24 inches.

When installing, ensure grooves are at least 0.015 inches deeper than the maximum radial wall thickness to prevent bottoming. The groove should also be at least 0.001 inches wider than the maximum piston ring width for free movement. The radial clearance between the cylinder bore and piston should be less than 1/3 of the radial wall thickness to ensure sealing effectiveness.

SKU: SPR-7002

Supplier Part Number (MPN): SPR-7002

Alternate Part Numbers: C1GG42

Specifications

Brand
HERCULES® SEALING PRODUCTS
Dimensions
0.25 in H x 0.243 in THK
grp Groove Depth
Grooves Must be at Least 0.015 in Deeper than the Maximum Radial Wall Thickness of the Piston Ring with a Tolerance of +0.003/-0 in, This is to Avoid Any Possibility of the Ring Bottoming in the Groove when the Ring is Compressed to its Working Diameter
grp Groove Width
To Permit the Ring to Slide Freely into the Groove, the Groove Must be at Least 0.001 in Wider than the Maximum Piston Ring Width with a Tolerance of +0.003/-0 in
grp Radial Clearance
The Radial Clearance Between the Cylinder Bore and Piston Should be Less than 1/3 of the Radial Wall Thickness of the Piston Ring to Ensure Sealing Effectiveness
Material
Iron
Series
SPR Series

Product Questions & Answers (2)

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Question by: Danny H on Feb 8, 2026, 11:30 AM
got a hydraulic cylinder here with a 7-inch bore and the piston ring groove needs to be cut right, what clearances am I working with on the groove depth and width for this ring?
Answer by: Customer Support on Feb 10, 2026, 7:58 AM
Groove depth needs to be at least 0.015 inches deeper than the maximum radial wall thickness of the ring, with a tolerance of plus 0.003, minus nothing. That extra depth keeps the ring from bottoming out in the groove once it gets compressed down to working diameter. On the width side, cut the groove at least 0.001 inches wider than the maximum ring width, same tolerance of plus 0.003, minus nothing. That gives the ring enough room to slide freely without binding up during operation.
Question by: Bobby B on Apr 5, 2026, 4:43 PM
got a piston cut for a 7 inch ring, is this one actually 7.00 OD and about a quarter inch wide?
Answer by: Customer Support on Apr 7, 2026, 9:32 AM
The key dimensions on this ring are a 7.00 inch outside diameter and a 0.249 inch width. It is a cast iron piston ring, sold under SKU SPR-7002, with alternate part number C1GG42.

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