Dayton Parts 321‑387 – Suspension Pivot / Spring‑Eye Bushing

The Dayton Parts 321‑387 is a direct-replacement suspension bushing designed for heavy-duty trucks, specifically for Mack & Hendrickson spring-eye and pivot applications. Built to OE precision, this high-quality rubber bushing helps reduce noise, vibration, and enhance load-bearing alignment. Ideal for fleet service or one-off repairs, its robust construction ensures reliable performance even under heavy-duty conditions.

🛠 Key Specifications

• Inner Diameter (I.D.): 1.25 in (1 ¼″)

• Outer Diameter (O.D.): 3.16in (approx. 3 1⁄8″)

• Length / Width: 3.63 in (3 5⁄8″)
  

Features & Benefits

• OE-quality rubber formulation engineered to 321‑387 OEM dimensions.

• Long-lasting service life in heavy-duty suspension environments.

• Simple fitment: no need for modifications or machining.

• Critical spring-eye support, helping mitigate wear and chassis movement.

Cross‑Reference & Compatibility

The Dayton 321‑387 aligns with multiple OEM and aftermarket counterparts – a versatile, cross-fit solution:

• ATRO PB50‑26648 (polyurethane alternative)

• Automann TRB5031 / TRB5032 / TRB5031SUB

• Flagg HS102 / RB299

• Gaff 18821

• Euclid E-13992

• Mack 4000‑58648000, Hendrickson 58648‑000 / 70425001

• Volvo HDR58648000 / 85109229; Hino 58648‑000

• Meritor R3013992 cross‑reference noted at Vander Haag's

This wide cross-reference pool ensures easy sourcing and compatibility across industry-standard heavy-duty truck brands and aftermarket parts.

Why Choose Dayton®?

Dayton Parts is a trusted name in medium‑ and heavy‑duty truck suspension components across North America. With thousands of SKUs, robust manufacturing facilities (e.g. Harrisburg, PA) and distribution centers (Texas, Nevada, Alberta, Ontario), Dayton delivers quality, availability, and fast shipping to support fleet uptime