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Silver metal piston with smooth cylindrical body and textured end cap

SPEEDAIRE

SPEEDAIRE PN21AA634G Piston 1 Inch

SKU CH-V4B0-VYG1G

A 1-inch piston compatible with Speedaire compressors and Grainger part 21AC16

  • Genuine SPEEDAIRE component for reliable compressor maintenance
  • One-inch piston sized for compatible pump models
  • Cross-references Grainger part 21AC16 for easy identification
  • New condition ensures full service life from installation
  • California Proposition 65 warning applies to this product

SPEEDAIRE 1-Inch Piston Component

This SPEEDAIRE PN21AA634G piston is a 1-inch replacement part designed for compatible Speedaire air compressor pumps. It serves technicians and maintenance teams who need to restore compression performance on supported equipment. The component is sold new and carries a California Proposition 65 warning for chemicals known to cause cancer and reproductive harm. Buyers should verify the exact pump model before ordering.

Compatibility Check Before Ordering

Confirm that your compressor pump matches the compatible Grainger part number 21AC16 and the indicated series before purchasing. The specifications list the compatible series as not applicable, so cross-referencing your unit's parts diagram is essential. No other dimensions, thread details, or material data are provided in the supplier facts. Ensure the existing piston bore and connecting rod alignment correspond to this 1-inch design.

Integration Into a Compressor Rebuild

This piston installs inside the pump cylinder and connects to the connecting rod assembly to complete the compression cycle. It requires matching piston rings, wrist pin, and cylinder bore condition to function correctly. Replacing a worn piston restores sealed compression and reduces oil carry-over into the air system. No lubrication type, torque values, or break-in procedure are supplied in the data.

Highlights

  • Genuine SPEEDAIRE component for reliable compressor maintenance
  • One-inch piston sized for compatible pump models
  • Cross-references Grainger part 21AC16 for easy identification
  • New condition ensures full service life from installation
  • California Proposition 65 warning applies to this product

Specifications

BrandSPEEDAIRE

Questions about this item

Does the SPEEDAIRE PN21AA634G piston ship with any seals, rings or gaskets, or must those be purchased separately?

The listing describes only the 1‑inch piston itself; no seals, rings or gaskets are mentioned, so plan to source those separately if your rebuild requires them.

The title shows a single 1‑inch piston — are there alternative bore sizes or kit versions for this model?

Only the 1‑inch piston (PN21AA634G) is presented; no other bore sizes or kit configurations appear in the product data.

How does the 1‑inch bore of this piston affect displacement or pressure output once installed in a compatible SPEEDAIRE pump?

The 1‑inch bore determines the swept volume per stroke; actual displacement and pressure depend on the pump’s stroke length, speed and overall design, which are not detailed here.

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