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The Sunnen PM-300 is a precision rod-boring machine designed to re-bore connecting rods, small bores, and other cylindrical components — often used in engine-rebuilding, remanufacturing, or performance shops. As a used machine, the PM-300 offers a cost-effective way to add or expand boring and cylinder-work capability without the expense of a new machine.
Whether you’re refreshing worn rods, re-bushing small journals, or prepping components for rebuild or custom applications, the PM-300 delivers the rigidity, tooling adaptability, and dimensional control needed for accurate bore work. In a shop environment, a properly maintained used PM-300 can serve reliably for years, making it a practical entry or upgrade for shops handling rod work, small-bore rework, or light engine rebuilding.
Precision Rod / Small-Bore Cylinder Boring — Designed to bore or re-bore connecting rods, small journals, and light-duty engine components and housings.
Adaptable Tooling Setups — Supports various boring bar sizes and tooling configurations, allowing shops to match the machine to the part size and material.
Compact Shop-Friendly Footprint — Easier to fit in existing shop space compared with large engine-block boring mills; suitable for rebuild shops, performance shops, and mixed-use machine floors.
Cost-Effective Used Machine Solution — Offers much of the functionality of new rod-boring machines at a lower cost — making upgrades or expansions more affordable for smaller or mid-size shops.
Versatile Work Capacity — Useful not only for rods but also for small housings, brackets, small industrial parts, and light repair work — adding flexibility to shop capabilities.
Good Entry Point for Rod & Journal Services — Practical for shops adding rod rebuilding, journal repair, or light machining services, without over-investing.
| Specification | Value |
|---|---|
| Model | Sunnen PM-300 Rod Boring Machine (Used) |
| Machine Type | Rod / Small-Bore Cylinder Boring Machine |
| Typical Workpieces | Connecting rods, small journals/bushings, light-duty housings, small castings/parts |
| Tooling Flexibility | Supports multiple boring-bar sizes and tool setups — configurable per job requirements |
| Use Cases | Rod re-boring, journal repair, sleeve or bush replacement, small-bore rework, light machining work |
| Best For | Machine shops, engine rebuild shops, remanufacturers, rod-service shops, light-duty rebuild work |
| Advantages | Versatile, compact footprint, cost-effective used option, adaptable to varied small-bore jobs |
| Limitations | Not intended for large-block main bore work or heavy industrial cylinders — capacity limited to small/medium bores |
Tell us what you need, and we’ll send you a quick and accurate estimate — no hidden fees, no obligations.
We make equipment decisions easy. Clear answers, accurate recommendations, and support from people who know the industry.
When you reach out, you get answers quickly - not generic replies.
Backed by 50+ years in engine machining and reconditioning.
No surprises, no unclear timelines.
Your machine’s long-term performance is our priority.
Decades before today’s engine shops trusted our equipment, Tony was already deep in the craft — rebuilding motors, machining blocks, and pushing for better precision.
A local newspaper once featured him as a standout young machinist, noting his drive, attention to detail, and obsession with doing things the right way. That same passion would eventually shape our company’s values.
Today, that commitment lives on in every machine we sell, every customer we support, and every shop we help succeed.