Wiseco S643 Piston Wrist Pin 0.927in x 2.250in 5115 Steel

The Wiseco S643 is a 5115 chromium alloy steel piston wrist pin measuring 0.927 inches in diameter and 2.250 inches in length with a 0.150-inch wall thickness, weighing approximately 104 grams. Designed for use with the CS24 spiral lock retainer, this wrist pin is precision-ground to a surface finish of .15 Ra or better, ensuring a consistent, accurate fit in high-performance aftermarket engine builds.

Wiseco's 5115 material pins are the standard-grade choice engineered to handle the normal stresses of performance engine operation. Case hardened to 58–64 Rockwell C, these pins deliver reliable durability under demanding conditions without unnecessary weight.

Wiseco S643 Wrist Pin Specifications:

• Diameter: 0.927 in.
• Length: 2.250 in.
• Wall Thickness: 0.150 in. (3.77mm wall)
• Weight: ~104 grams
• Retainer Type: CS24 spiral lock
• Sold: Individually

5115 Chromium Alloy Steel Features:

• Standard-grade chromium alloy steel construction
• Case hardened to 58–64 Rockwell C for excellent surface durability
• Precision-ground to a surface finish of .15 Ra or better
• Engineered to withstand normal wear and tear in aftermarket engine applications

For higher-demand builds, Wiseco also offers the S643-equivalent sizes in 52100 high-carbon chromium-bearing aircraft-quality steel (case hardened to 54–56 Rockwell C, through-hardened for high load capacity) and 9310 low-carbon case-hardened steel (superfinished to .025 Ra or better, rated for turbo and nitrous applications requiring high surface strength and core toughness). The S643 in 5115 steel is an ideal choice for naturally aspirated and mildly boosted performance street and track engines.