M50134 vs M52050 | Mid-Stop vs Top Deck Counterbore Tools - Apex Tool Company
M50134 vs M52050 Counterbore Tools – Which One Do You Need?
Two of the most popular counterbore tools at Apex Tool Company are the M50134 (PT2210-A) and the M52050. Both are professional-grade diesel engine repair tools, but they serve very different purposes in heavy-duty machine shops across the USA and Canada.
• M50134 – Mid-Stop Counterbore & Shim Resurfacing Tool (Cummins / Mack focused)
• M52050 – Heavy-Duty Top Deck Counterbore Sleeving Tool (CAT, Cummins, Detroit)
Head-to-Head Comparison
| Feature | M50134 (PT2210-A) | M52050 |
|---|---|---|
| Primary Function | Mid-Stop Liner Counterbore & Shim Resurfacing | Top Deck Counterbore Machining & Sleeving |
| Best For | Cummins L10, M11, ISM, ISL, Mack E7 | CAT 3400 Series, Cummins NT/N14/ISX, Detroit 60 Series |
| Price (USD) | ~$2,268 | ~$9,700+ |
| Use Case | Precision shim surface restoration | Salvaging cracked or damaged top deck counterbores with repair sleeves |
Detailed Breakdown
1. Monaco M50134 / PT2210-A Mid-Stop Counterbore Tool
This specialized tool is designed to resurface the **mid-stop liner counterbore ledge** (shim surface) in the engine block. It ensures perfect flatness and correct depth for liner seating on mid-stop engines.
- Excellent for Cummins and Mack engines
- Compact and easy to use in the bay
- Prevents coolant leaks and liner movement
- Great ROI for shops doing frequent Cummins in-frames
2. M52050 Top Deck Counterbore Sleeving Tool
A heavy-duty powerhouse tool used to machine out damaged top-deck counterbores so that repair sleeves can be installed, saving expensive engine blocks from being scrapped.
- Handles large bores on CAT, Cummins NT/N14, and Detroit engines
- Precision depth control and rugged construction
- Highest ROI tool for high-volume machine shops
- Capable of full sleeving repair process
Which Tool Should You Buy?
- Choose M50134 if you mainly work on Cummins and Mack mid-stop engines and need precise shim/counterbore resurfacing.
- Choose M52050 if you repair top-deck damage on CAT, large Cummins, and Detroit engines and want to save cracked blocks.
- Best Solution: Many professional shops in the USA and Canada buy **both** tools for complete counterbore coverage.
Shipping to USA & Canada
Both tools are in stock at Apex Tool Company in Columbus, Indiana. Free shipping on orders over $500 in the continental USA. Full international shipping available to all Canadian provinces with proper USMCA documentation.
Ready to Upgrade Your Counterbore Capabilities?
Contact Apex Tool Company today for application advice and current pricing.
Buy M50134 Buy M52050Call: 812-579-5478
Apex Tool Company — America's trusted source for professional diesel repair tools since 1975.