Dorman 531-921 Suspension Ball Joint - Front Lower

Dorman 531-921 Front Lower Ball Joint

Dorman 531-921 is a metal suspension ball joint engineered as a direct replacement for the original equipment on specific vehicles. It is built for front lower suspension service on Mazda RX-7 and Mazda 626 applications from the late 1970s through the mid-1980s.

• Direct replacement suspension ball joint for front lower position
• Metal housing and metal bearing material
• Greaseable design with zerk fitting included
• Pressed mounting type with taper stud
• Castle nut, cotter pin, and mounting hardware included
• Dust boot made from polychloroprene
• Stud thread diameter: 12 mm with M1.5 thread pitch
• Housing press fit diameter: 43.05 mm

Vehicle Fitment

• Fits 1979-1985 Mazda RX-7, front lower.
• Fits 1979-1982 Mazda 626, front lower.

This part cross-references Mevotech Original Grade GK9095 and Mevotech Supreme MK9095 for the same application. The Dorman 531-921 is also listed with interchange references including 817349310, K-9095, and K9095.

Detailed Replacement Overview

Use Dorman 531-921 when replacing a worn front lower ball joint on a Mazda RX-7 or Mazda 626. The pressed-in design, taper stud, and included castle nut and cotter pin support a proper suspension connection at the steering knuckle, while the greaseable construction gives service access through the zerk fitting. For shoppers searching for a Mazda RX-7 front lower ball joint or a Mazda 626 front lower suspension ball joint, this part number matches the listed OE-style application.

Common Problems This Part Can Address

• Excessive front suspension play
• Clunking or knocking from the lower control arm area
• Uneven tire wear related to worn ball joint movement
• Loose or imprecise steering feel
• Visible boot damage or grease loss at the joint

Installation Notes and Tips

Press-fit ball joints require proper removal and installation equipment to avoid damage to the control arm. Confirm the housing press fit diameter, stud thread size, and front lower position before installation. After service, torque fasteners to the vehicle specification and verify cotter pin engagement. Because this is a greaseable joint, service the zerk fitting after installation according to the vehicle maintenance schedule.

Quality Assurance

Dorman states that this suspension ball joint is precision-engineered and rigorously tested for reliable replacement on the specified vehicles. The metal construction, pressed mounting design, and included service components support consistent fitment for the listed Mazda applications.