Wiseco S611 Chromed Piston Wrist Pin 0.901 in. x 2.500 in. 5115 Steel

The Wiseco S611 is a chromed piston wrist pin measuring 0.901 in. (22.89 mm) in diameter and 2.500 in. in length, weighing approximately 121 grams. Manufactured from 5115 chromium alloy steel and case hardened to 58–64 Rockwell C, this wrist pin is engineered to handle the demands of high-performance aftermarket engine builds. Compatible with Wiseco W5860 circlip locks.

The piston wrist pin — also called a gudgeon pin — is a critical connecting component responsible for transferring extreme combustion forces between the piston and connecting rod. Wiseco engineers its wrist pins to precise tolerances with superior surface finishes for reliable, long-lasting performance.

S611 Pin Specifications:

• Outer Diameter: 0.901 in. (22.89 mm)
• Length: 2.500 in.
• Weight: 121 grams
• Material: 5115 chromium alloy steel
• Coating: Chromed
• Case hardness: 58–64 Rockwell C
• Surface finish: Ground to 0.15 Ra or better
• Compatible lock: Wiseco W5860

About Wiseco Piston Pin Material Grades:

Wiseco offers wrist pins in three distinct material grades to match different performance requirements:

5115 Material (This Pin)

• Standard-grade chromium alloy steel
• Case hardened to 58–64 Rockwell C
• Ground to a surface finish of 0.15 Ra or better
• Designed for normal wear and tear in aftermarket engine applications

52100 Material

• High-carbon, chromium-bearing steel
• Aircraft-quality alloy, through hardened
• Case hardened to 54–56 Rockwell C
• Ground to a fine finish
• Engineered for high load capacity and outstanding wear and abrasion resistance

9310 Material

• High-quality, low-carbon case hardened steel
• Case hardened to 59–63 Rockwell C
• Superfinished to 0.025 Ra or better
• Designed for applications requiring high surface strength combined with high core toughness
• Ideal for high-contact stress with shock and impact loading — including turbo and nitrous applications