Guide rings

SKF guide rings are precision machined according to tight tolerance specifications on the radial section of the guide. Therefore, they optimize guide load distribution and limit radial misalignment of components for best seal performance. SKF supplies the following guide rings:

  • WAT rod or piston guide rings
  • RGR rod guide rings
  • PGR piston guide rings

All of these precision guide rings are split with an angle cut as standard table 1. Other types and designs or angles of cut are available on request.

WAT rod or piston guide rings

These standard guide rings can operate dynamically either on their outside or inside surfaces and, therefore, can be used in piston or rod applications. WAT guide rings are made of glass fibre reinforced polyamide (P-2551) as standard. On request, SKF can supply WAT guide rings in a variety of materials, including P-2552 (self lubricated rings with PTFE fillers).

WAT rod or piston guide rings are available in metric (→ Size list [pdf]) and inch sizes (→ Size list [pdf]).

RGR rod guide rings

RGR guide rings are developed for guiding rods by operating dynamically on their inside surface. They are made of phenolic resin with cotton fabric laminate (PF) as standard. On request, SKF can supply RGR guide rings in a variety of materials.

They are manufactured and packaged to promote an open split before installation and, therefore, are clamped with their outside surface in the cylinder head. This makes it easier to assemble the cylinder later.

RGR rod guide rings are available in metric sizes (→ Size list [pdf]).

PGR piston guide rings

PGR guide rings are developed for guiding pistons by operating dynamically on their outside surface. They are made of phenolic resin with cotton fabric laminate (PF) as standard. On request, SKF can supply PGR guide rings in a variety of materials.

They are manufactured and packaged to promote a narrow split or even closed ring before installation and, therefore, are clamped with their inside surface on the piston. This makes it easier to assemble the cylinder later.

PGR piston guide rings are available in metric sizes (→ Size list [pdf]).

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