SUNNEN GY25J87 Med Silicon Carbide Keyway Honing Stones 2.5 3.3

( Brand: Sunnen ), ( Manufacturer Part Number: GY25J87 ), ( Country Of Origin: United States )

Review SUNNEN Sm Med Grit Silicon Carbide 2.5 Inch To 3.3 Keyway Honing Stones

Introducing the SUNnen Gy25J87 SM Med Silicon Carbide 2.5-3.3 Keyway Honing Stones, a high-performance tool designed to deliver precise and efficient honing results for automotive engine components. These stones are specifically engineered for use with the SUNnen keyway honing system, making them an essential addition for engine builders, machine shops, and automotive enthusiasts.

The Gy25J87 SM Med stones feature a medium-grit silicon carbide abrasive, which offers an optimal balance between cutting capacity and finish quality. This grade is ideal for removing stock material, smoothing rough surfaces, and preparing components for further machining or assembly.

Measuring 2.5 inches in width and 3.3 inches in length, these stones provide ample surface area to cover larger engine components with minimal passes, saving time and effort. Their compact size also makes them easy to handle and maneuver in tight spaces.

The silicon carbide abrasive is known for its exceptional durability and resistance to heat and water. This makes the Gy25J87 SM Med stones suitable for use in various honing applications, including aluminum and cast iron engine blocks, cylinder heads, and crankshafts.

The keyway honing stones are designed with a unique, tapered shape that conforms to the contours of engine components, ensuring even contact and consistent honing results. Additionally, the stones are precision-engineered to fit securely within the honing fixture, eliminating the need for constant adjustments and ensuring accurate keyway alignments.

The Gy25J87 SM Med Silicon Carbide 2.5-3.3 Keyway Honing Stones come in sets of three, allowing you to progressively hone your components with finer grits to achieve a smooth, polished finish. For best results, it is recommended to use these stones in conjunction with SUNnen's honing oil and coolant, which help lubricate the honing process and dissipate heat.

In summary, the SUNnen Gy25J87 SM Med Silicon Carbide 2.5-3.3 Keyway Honing Stones are a versatile and reliable tool for engine builders and machinists. Their medium-grit silicon carbide abrasive, compact size, and tapered shape make them an essential component of any keyway honing system. With their exceptional durability and ease of use, these stones will help you achieve the precise, consistent honing results you need to produce high-performance engine components.

Sunnen gy25j87 sm med silicon carbide 2.5-3.3 keyway honing stones are used for honing automotive engine cylinders. Here are some pros and cons of buying these honing stones:

1. High-quality material: Silicon carbide is a durable and hard material that can effectively remove metal to create a smooth cylinder surface.

2. Consistent honing: These stones can provide consistent honing results, which is essential for optimal engine performance.

3. Versatile: The 2.5-3.3 keyway size makes these stones suitable for a wide range of engines.

4. Long-lasting: Silicon carbide stones have a longer lifespan compared to other types of stones.

5. Improves engine efficiency: Honing the engine cylinders can improve engine efficiency and reduce friction, leading to better fuel economy and longer engine life.

1. Expensive: Compared to other types of honing stones, silicon carbide stones can be more costly.

2. Requires specialized equipment: Honing engine cylinders requires specialized equipment, such as a hone, which can be expensive.

3. Time-consuming: Honing engine cylinders is a time-consuming process that requires patience and attention to detail.

4. Dust and debris: Honing the cylinders can generate a significant amount of dust and debris, which can be messy and require cleanup.

5. Risk of damage: If not used properly, honing stones can damage the engine cylinders or cause other issues.

Sunnen gy25j87 sm med silicon carbide 2.5-3.3 keyway honing stones offer several advantages, such as high-quality material, consistency, versatility, and long-lastingness. However, they also have some disadvantages, including cost, the need for specialized equipment, time-consuming nature, and the potential for mess and damage.

If you are a professional mechanic or engine builder, the benefits of using these stones may outweigh the drawbacks. However, if you are an average car owner, it may be more cost-effective and practical to have your engine honed by a professional. Ultimately, the decision to buy these stones depends on your specific circumstances and needs.

If you are a professional mechanic or engine builder, and you frequently hone engines, then investing in Sunnen gy25j87 sm med silicon carbide 2.5-3.3 keyway honing stones is a worthwhile investment. If you are an average car owner, it may be more cost-effective and practical to have your engine honed by a professional. Instead, consider investing in a high-quality engine oil or other maintenance services to keep your engine running smoothly.

Details:

GY25J87 GY25 SILICON CARDBIDE STONE SET, VITRIFIED BOND - ATO. Tool Series: AN112, AN6 AN815, ANR275, GNH1010, GNH3610, GNR1010, GNR3610. Uncertain of the condition if they are new or used.

part #: gy25j87 prices

• $24.95-$32.95

specifications shopequipm:

• brand: Sunnen
• mpn: Gy25j87
• country of origin: United States

offer shopequipm:

• sold: 0
• availability: In Stock
• quantity: 1
• best offers: True
• options: Ship-to-home
• started: November 16, 2025

seller shopequipm:

• rating: 99.3%
• # reviews: 3684
• city: Brazoria, Texas

shipping shopequipm:

• class: Standard
• cost: $0.00
• service: USPS Ground Advantage
• transit: 4-10 Days
• carrier: USPS
• type: Calculated

general shopequipm:

• Automotive Tools Supplies > Shop Equipment Supplies > Other Shop Equipment
• condition: Used

returns shopequipm:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

payments shopequipm:

• wallet: Apple-pay
• credit card: Mastercard
• other

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