Product Detail

Large Bore A Series

Quick Overview


NFPA Interchangeable

Max Operating Pressure: 250 PSI (17 bar)
Bore Size: 8 to 14 in (203 to 365 mm)

The Large Bore A Series is an NFPA Interchangeable cylinder line that is designed and built to excel in the most demanding applications. The Large Bore A Series encompasses many of the proven design features of the A Series.

Standard Specifications

  • Meets NFPA specifications
  • Bore sizes - 8” to 14” (203 to 356 mm)
  • Piston rod diameters - 1-3/8” to 2-1/2” (35 to 64 mm)
  • Maximum pressure rating - 250 PSI air (17 bar)
  • Standard temperature - -10 to +165 °F (-23 to +74 °C)
  • NPTF ports
  • Flexible port and cushion location
  • Multitude of mounting options


The 8” bore tube is hard coat anodized aluminum. The hard coating is an electro-chemical process, which produces a very dense surface of aluminum oxide. This surface has extreme hardness (60 RC.), excellent wear and corrosion resistance, and a low coefficient of friction. The 10”, 12”, and 14” bores use a honed, chrome plated steel tube.

End Caps

The end caps are accurately machined from (6061-T6) solid aluminum bar stock. They are anodized for corrosion resistance. Additionally, a recess on the piston-mating surface (at both ends) enables the air to work on a larger piston area for effortless breakaway.

Rod Bushing

The 8” bore includes a graphite filled, cast iron rod bushing. The 10”, 12”, and 14” bores are equipped with a bronze bushing. Both bushing types are extra long in length. The added length adds superior alignment and support of the piston rod as well as provides maximum load bearing support. Both bushing materials offer an excellent bearing surface for a hard chrome plated piston rod.

Rod Seal

The carboxilated nitrile with PTFE compound rod seal is selflubricating and durable. The rounded lip design ensures proper sealing and long life.

Rod Wiper

The standard rod wiper construction is a highly durable polyurethane.

Piston Rod

High strength steel (100,000 psi minimum yield) piston rod has a ground, polished, and chrome plated surface. This surface provides maximum life for both the rod bushing and the seals.

Bushing Retainer

The bushing retainer allows cartridge removal (cylinder repair) without complete disassembly.

Tie Rods

The tie rods are 100,000 psi minimum yield steel for maximum holding power. The threads are roll formed for superior strength and engagement.

Piston Seal

The piston seal is a carboxilated nitrile with PTFE compound making it self-lubricating. The “T” seal with back-up ring configuration is standard on the 8” bore design. A lip seal configuration is used on 10”, 12”, and 14” bores. Both seal types prevent rolling and are designed to seal at all pressures.

Wear Band

The wear band is a stable, lubricating strip located on the piston. We separated the load bearing points by locating the wear band at the rear of the piston. This maximizes column strength at full extension.


The solid aluminum alloy piston is strong and durable. On the 10”, 12”, and 14” bores we use a nylon locking insert nut to attach the piston to the piston rod. This enables piston rod disassembly if necessary.

Cushion Seal

The floating cushion seal design enables rapid stroke reversal by providing instantaneous full flow to the piston. Each cushion has a flush, retained adjustment needle.

Tube End Seal

The tube end seals are compression type and reusable.


Numatics' enhanced port design enables the cylinder to work more efficiently. Through the use of precise machining depths and tool shape, Numatics is able to smooth the flow path into and out of the cylinder.

Product Specifications