Product Detail

ASP Series

Quick Overview


NFPA Interchangeable Max Operating Pressure: 250 PSI (17 bar)
Bore Size: 1.5 to 14 in (38 to 356 mm)

The ASP Cylinder Line is a heavy-duty, steel body cylinder line that is designed and built to exceed all of your strenuous application requirements. The ASP Series is an NFPA Steel Body pneumatic cylinder line. The ASP Series encompasses many of the same proven design features as our original NFPA Interchangeable cylinder, the A Series. This includes the extra long graphite filled cast iron rod bushing and a standard oversize wear band (located on the rear of the piston). Additionally, we have also included the proven “T” piston seal configuration with carboxilated nitrile with self-lubricating PTFE compound. These are just a sample of things that make the ASP Series the Superior Steel Body air cylinder line.

Standard Specifications

  • Meets NFPA specifications
  • Bore sizes - 1-1/2” to 14” (38 to 356 mm)
  • Piston rod diameters - 5/8” to 3-1/2" (16 to 89 mm)
  • Maximum pressure rating - 250 PSI air (17 bar)
  • Standard temperature - -10 to +165 °F (-23 to +74 °C)
  • All steel construction, except piston (aluminum)
  • NPTF ports
  • Flexible port locating


Numatics' honed tubing is produced using their suitable to hone Drawn Over Mandrel (DOM) and Cold Drawn Seamless (CDS). This tubing is ready to use for pneumatic or hydraulic cylinders without further ID processing. The honing process involves using abrasive polishing stones and abrasive paper to remove small amounts of material, to produce extremely precise ID dimensions and improved finishes.

End Caps

The end caps are accurately machined from precision square steel blocks. They also have a black oxide finish to protect from corrosion. Additionally, a recess on the piston-mating surface (at both ends) enables the air to work on a larger piston area for effortless breakaway (even at low pressures).

Rod Bushing

The ASP Series (1-1/2" through 8") includes a graphite filled, cast iron rod bushing that is extra long in length. Graphite filling offers the best bearing surface when using a hard chrome plated piston rod. Cast iron provides maximum resistance against wear. The added length adds superior alignment and support of the piston rod as well as provides maximum load bearing support. Sizes 10" through 14" bores include an extra long bronze rod bushing.

Rod Seal

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

Rod Wiper

The standard rod wiper construction is highly durable polyurethane.

Piston Rod

The 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 (except X1 and X3 mounts). Full-face retainer on 1-1/2" through 2-1/2" bore. Round retainer on 3-1/4" through 14" bore. Both the full-face and round retainer are steel construction.


The tie-rods are 100,000 psi minimum yield steel for maximum holding power. They are roll formed for superior strength and engagement (up to 5/8").

Piston Seal

The piston seal is carboxilated nitrile with PTFE compound for self-lubricating. The “T” seal with back-up rings prevents rolling and seals at all pressures.

Wear Band

The wear band is a stable, lubricating strip located on the piston. Numatics 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.

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. The use of precise machining depths and tool shape allows a smooth flow path into and out of the cylinder.

Product Specifications