ARP con rod bolts BMW M3 E36 Z3M S50B30 S50B32

This set of performance con rod bolts for the BMW M3 E36 and Z3M is made up of 12 ARP bolts.

Fitting instructions are available above, in the "Download" tab.

Below (click on the image) you will find the tri-metal big end bearings and main bearings for the BMW S50B30 engine:

Below (click on the image) you will find the tri-metal big end bearings and main bearings for the BMW S50B32 engine:

Gary Holzapfel came from the aerospace industry and founded ARP (Automotive Racing Products) in the early 1970s to answer a major problem in motorsport: engine failures caused by bolts and studs that were simply not strong enough. At the time, no manufacturer was able to meet that need. ARP now offers thousands of part numbers across several ranges and product types, including head bolts, main bearing bolts and con rod bolts. Depending on the application, ARP offers different fastener materials:

• 8740: a chrome-molybdenum steel with standard strength properties, perfectly suited to prepared engines. This steel offers a tensile strength of between 1240 and 1447 N/mm².
• ARP2000: stronger than 8740, the ARP2000 alloy withstands clamping and tensile loads of up to 1516 N/mm². This range is widely used on circuit and drag cars, and can be used with hydrogen.
• L19: a premium treated steel offering tensile and fatigue strength well above the 8740 and ARP2000 ranges. Its tensile strength reaches up to 1792 N/mm². This material is more sensitive to corrosion, so it must be kept oiled and never exposed to moisture. Hydrogen is not recommended with this range.
• CA625+ (Custom Age 625 Plus): this "super alloy" offers far higher technical properties while resisting corrosion and oxidation. Its tensile strength reaches 1930 N/mm².

All ARP hardware is designed and manufactured in the United States. Production starts with cold or hot forging, followed by a heat treatment that varies with the range, then shot peening to remove any surface irregularity. Precision grinding then delivers perfect concentricity before the thread is rolled. Finishing comes last, with a coating such as black chrome-molybdenum oxide, or a polished stainless steel finish depending on the product range.

Every kit is supplied with assembly lubricant and an instruction sheet covering:

• the fitting steps
• the tightening torque
• the tightening procedure