4GP20-968UC SUNNEN Honing Mandrel

Review SUNNEN Honing Mandrel .962 Inch .1000

The Sunnen 4GP20-968UC 4ML-968M Honing Mandrel 962-1000 is a high-performance accessory designed for use with crankshaft grinding machines to hone and finish engine crankshafts. This mandrel is specifically engineered to fit Sunnen model 962 and 1000 crankshaft grinders.

The mandrel is constructed of precision-machined, heat-treated steel, ensuring durability and rigidity during the grinding process. Its 4-lobe design provides excellent contact with the crankshaft, ensuring efficient and effective honing. The 4ML-968M designation indicates that this mandrel is suitable for use with 4-lobe crankshafts having a 968mm (37.72 inches) journal diameter.

The mandrel features a large, easy-to-grip handle for operator comfort and control during the grinding process. Its polished surface provides a slip-resistant grip, reducing the risk of slipping or injury. The mandrel also includes a securely mounted, adjustable counterweight to help balance the grinding machine and improve operator comfort.

The Sunnen 4GP20-968UC 4ML-968M Honing Mandrel 962-1000 is designed for use with a wide range of engine types, from automotive to industrial applications. Its precise engineering and manufacturing ensure accurate and consistent honing results, helping to extend the life of the crankshaft and improve engine performance.

This mandrel is easy to install and remove from the crankshaft grinder, making it a versatile and convenient addition to any machine shop or garage. Its durable construction and excellent performance make it a must-have accessory for anyone who needs to hone engine crankshafts.

In summary, the Sunnen 4GP20-968UC 4ML-968M Honing Mandrel 962-1000 is a high-quality, precision-engineered accessory for use with Sunnen model 962 and 1000 crankshaft grinders. Its 4-lobe design, durable construction, and adjustable counterweight make it an essential tool for honing and finishing engine crankshafts.

Pros and Cons of Buying SUNnen 4GP20-968UC Honing Mandrel: A Detailed Analysis

The SUNnen 4GP20-968UC honing mandrel is a popular choice among mechanics and engine builders due to its versatility and high-quality construction. In this analysis, we will discuss the key advantages and disadvantages of investing in this honing mandrel.

1. Compatibility: The SUNnen 4GP20-968UC mandrel is compatible with various engine sizes and types, including V6, V8, and inline 6-cylinder engines. It can accommodate bore sizes ranging from 3.91 to 9.25 inches (99.3 to 234.9 mm).

2. Durability: This mandrel is constructed from aircraft-grade aluminum, ensuring it is lightweight yet robust. The hardened steel bushings are designed to provide long-lasting precision and accuracy during the honing process.

3. Versatility: The SUNnen 4GP20-968UC honing mandrel comes with interchangeable end caps, allowing users to easily switch between different honing patterns and applications (e.g., crankshaft, connecting rods, or cylinder bores).

4. Precision: This mandrel offers excellent precision, thanks to its accurately machined surfaces and high-quality bushings. This ensures a consistent honing process and optimal engine performance.

5. Easy-to-use: The SUNnen 4GP20-968UC honing mandrel is relatively easy to use, even for those with limited honing experience. The mandrel's design allows for quick setup and disassembly, making it a practical choice for both professional shops and home garages.

1. Cost: The SUNnen 4GP20-968UC honing mandrel is more expensive than some other options on the market. This may be a deterrent for those with limited budgets.

2. Requires additional tools: To use this honing mandrel effectively, you may need to invest in additional tools, such as a honing machine, honing stones, and a honing solution.

3. Learning curve: While the SUNnen 4GP20-968UC mandrel is relatively easy to use, it may still require some practice to master the honing process. Proper technique and patience are essential for achieving optimal engine performance.

The SUNnen 4GP20-968UC honing mandrel is a high-quality, versatile, and durable tool that offers excellent precision and compatibility with various engine sizes and types. Its compatibility with interchangeable end caps makes it a versatile choice for different honing applications. However, its higher cost and the requirement for additional tools may be deterrents for some potential buyers.

If you are a professional mechanic, engine builder, or enthusiast with a well-equipped garage, the SUNnen 4GP20-968UC honing mandrel is an excellent investment for your shop or personal projects. Its high-quality construction, precision, and versatility make it a valuable asset for achieving optimal engine performance. However, for those with limited budgets or minimal honing experience, it may be worth considering more affordable options or seeking professional services.

Details:

The stone wedge, tension blocks, and slot are all in great shape. Condition: in good used condition. Range: .968 - 1.000 24,43mm 25,40mm. Sunnen 4GP20-968UC / 4ML-968M honing mandrel .962 - .1000 , manufacturer.

New part number: 4GP20-968UC. The coating shows moderate worn along the stone slot and on shank. Old part number: 4ML-968M. The equipped guide shoes have a majority of life remaining, and the stones are new.

specifications lightument:

• brand: Sunnen
• mpn: 4gp20-968uc
• country/region of manufacture: United States

offer lightument:

• availability: in stock
• started: july 23, 2025
• sold #: 20
• options: ship-to-home
• in stock #: 5
• best offers: true
• prices: $280.00–$575.00
• item condition:
  • New
  • Used

shipping lightument:

• type: calculated
• class: expedited, standard
• carrier: usps, fedex
• service: usps priority mail, fedex ground or fedex home delivery
• transit: 3-8 days

payments lightument:

• credit card: discover
• other
• wallet: paypal

general lightument:

• category: Business & Industrial > Light Equipment Tools

seller lightument:

• rating: 99.4%
• # reviews: 4077
• city: council grove, kansas

returns lightument:

• time: 30 days
• method: money back
• policy: returns accepted
• paid by: buyer