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PERMCO 5/8-11 X 12-1/2 TIE BOLT

Description & Features

Manufactured by Permco, this 5/8-11 x 12-1/2 tie bolt is a structural fastener used to secure pump and motor housing assemblies in hydraulic gear pump applications. Tie bolts of this type maintain clamping force across pump end plates and housings, keeping internal components properly aligned and sealed under working conditions.

The 5/8-11 thread designation indicates a coarse unified thread profile, and the 12-1/2 inch length is sized for tandem or multi-section pump configurations where extended bolt engagement is required. As a genuine Permco component, it is designed to meet the dimensional and load requirements of compatible Permco pump assemblies.

SKU: ZD-0391-125

Supplier Part Number (MPN): ZD-0391-125

Specifications

Brand Permco Inc.	Brand Permco	Pack Size 1.00	UOM EA	Supplier Part Number ZD-0391-125	Product Weight 1.00 lbs

Product Questions & Answers (1)

Question by: Ronnie E on Sep 13, 2025, 7:02 PM

got a tandem pump setup that needs a new tie bolt, this one's 12 and a half inches, that right?

Answer by: Customer Support on Sep 15, 2025, 7:12 AM

Yeah, 12-1/2 inches is the listed length on this one. That extended length is exactly what tandem and multi-section Permco pump configurations call for, where the bolt has to span across multiple housings and end plates to keep everything clamped and aligned. Single-section pumps typically run shorter bolts, so if you're working on a tandem unit, this length makes sense for that application.