The Stone River Products hydraulic O-Ring service kit provides 580 O-Rings across 32 OEM-referenced sizes in one organized service case. It is configured for SAE STOR and ORFS hydraulic connections commonly encountered during heavy equipment maintenance and hydraulic system repair.
Every O-Ring in the assortment is black 90-durometer Nitrile, also known as Buna-N or NBR. The kit is offered as a replacement/cross-reference assortment for applications using Caterpillar 4C4782 and 270-1528.
This assortment is designed around O-Rings used in SAE STOR (Straight Thread O-Ring) and ORFS (O-Ring Face Seal) hydraulic connections. These sealing systems are commonly encountered on hydraulic equipment, hoses, fittings and machinery.
Keeping a broad assortment of replacement seals available allows technicians to address damaged, leaking or missing O-Rings without stopping a repair to locate and order one individual seal.
All seals in this assortment are manufactured from 90-durometer Nitrile, also known as Buna-N or NBR. The higher hardness is well suited to hydraulic sealing applications where pressure and resistance to extrusion are important.
Nitrile is commonly used with petroleum oils, diesel fuel, many petroleum-based hydraulic fluids and automatic transmission fluids.
The 580-piece assortment contains 32 OEM-referenced O-Ring sizes. Reference numbers and quantities are identified on the size chart supplied inside the case, allowing technicians to identify and organize replacement seals during service.
Included references shown for this assortment include 4J0527, 4J7533, 7J0204, 3J7354, 1J9671, 3J1907, 4K1388, 4J0526, 4J0522, 4J0520, 4J5267, 2M9780, 7M8485, 4J0525, 4J0519, 4J5140, 3D2824, 2S4078, 4J0524, 6V9746, 5K9090, 6V8400, 8T0315, 6K6307, 4J0523, 4J5477, 6V8397, 6V8398, 7J9108, 3K0360 and 304606.
See the included case chart and product photographs for complete individual size identification and quantities.
A hydraulic repair can come to a stop because of one damaged O-Ring. Keeping 580 replacement seals covering 32 common reference sizes together in one case gives technicians immediate access to a broad range of replacement seals.
The assortment can help reduce emergency parts orders, trips to the parts counter and time spent searching through loose seals when equipment needs to get back into service.
The assortment is supplied in a large compartmented service case with latches and a carrying handle. Individual compartments keep different O-Ring sizes separated, while the identification chart inside the lid provides a convenient reference during repairs.
The case is well suited for service trucks, maintenance rooms, hydraulic shops and equipment repair facilities where organization and quick access to replacement seals matter.
Nitrile is not suitable for every fluid, chemical or operating environment. Do not select an O-Ring based solely on physical size. Fluid compatibility, temperature, pressure, hardness and application requirements should all be verified before installation.