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257 G/SH ST 2-1/2 C-KEYED

Description & Features

Manufactured by Permco, the 257 G/SH ST 2-1/2 C-Keyed is a gear pump shaft component designed for use within Permco's 257 series hydraulic gear pump configurations. The 2-1/2 designation indicates the shaft sizing, and the C-keyed drive end configuration ensures positive rotational engagement with compatible drive couplings or power take-off interfaces.

This is a genuine Permco replacement part, suited for maintaining or rebuilding 257 series gear pumps in mobile and industrial hydraulic systems. Selecting the correct shaft style and keying is critical to proper pump assembly and drive alignment.

SKU: 024-00842-25

Supplier Part Number (MPN): 024-00842-25

Specifications

Brand Permco Inc.	Brand Permco	Pack Size 1.00	UOM EA	Supplier Part Number 024-00842-25	Product Weight 1.00 lbs

Product Questions & Answers (1)

Question by: Hank H on Feb 26, 2026, 8:37 PM

got a Permco 257 pump that needs a new shaft, this the right fit for the 2-1/2 C-keyed configuration?

Answer by: Customer Support on Feb 28, 2026, 6:06 PM

Permco's 257 series uses specific shaft and keying configurations, and the 2-1/2 C-keyed designation on this part matches that setup directly. If your existing pump carries that same shaft size and key type, this would be the corresponding replacement. Worth confirming your current shaft measurement and key slot match before ordering, just to be sure nothing's been modified on your unit over time.