IDI Hydraulic Rod Seal Overview

The IDI hydraulic rod seal is a single-acting U-cup profile rod seal made from polyurethane (PUR). It is used in reciprocating hydraulic cylinders, where its core function is to stop hydraulic oil from leaking out along the piston rod and to block external contaminants from entering the cylinder. IDI is a recognised rod seal profile name; it is not a brand and does not indicate original-equipment authorisation.

DJF Factory supplies IDI rod seals as a metric size series. Each size is defined by four dimensions that must all match the cylinder drawing: rod diameter, housing bore diameter, seal height and groove width. Because IDI is a profile family, the same seal is found in many different reciprocating cylinders rather than in one specific machine, so selection is always driven by dimensions rather than by machine name.

Verified Product Specifications

The figures below are taken from the DJF Seal IDI catalogue data and cover the full IDI size series supplied in this listing.

IDI Rod Seal Size Table

The table lists all 154 IDI sizes with the reference, profile and the four dimensions needed to confirm a fit: Rod ID (d), Housing OD (D), Seal Height (h) and Groove Width (H). Values are in millimetres. Where the source data does not give a groove width, it is shown as “-” and is not estimated.

Application and Fitment

IDI rod seals are used in reciprocating hydraulic cylinders across construction and mobile hydraulic equipment, including cylinders on excavators, loaders and other mobile machinery. The seal is fitted in the cylinder gland (rod guide) and works against the piston rod.

IDI is a dimensional profile, so fitment is determined by the four seal dimensions and by the cylinder drawings, not by a machine brand or model number. We therefore publish the dimensions rather than machine-specific fitment lists, and we ask customers to confirm the drawing before ordering.

Wholesale Supply

DJF Seal supplies IDI hydraulic rod seals for B2B and wholesale requirements, including replacement supply for hydraulic cylinder repair and maintenance programmes. Orders are quoted against the exact reference and dimensions required.

Because the IDI series covers 154 metric sizes, mixed and repeat wholesale requirements can be supplied from the same series. Send your size list, quantities or cylinder drawing and we will quote accordingly.