Auto Service World
  June 20, 2016   by CARS Magazine

CRP Automotive offers REIN Automotive Aluminum Stretch Bolts

REIN BMW Aluminum Stretch BoltsCRP Automotive now offers Rein Automotive Aluminum Stretch Bolts for BMW engine applications.

These stretch bolts are designed as replacements for the “one time use” only fasteners used by BMW to mount components such as transmissions, oil pans, water pumps, power steering pumps, and alternators to their engine assemblies.

Rein Automotive Brand Manager, Paul Swyter, explains, “BMW uses a magnesium-aluminum composite to make their 3.0 in-line six, one of the world’s lightest 3.0 liter gas engines. While this reduced weight improves performance, efficiency, and overall block strength, it comes at a price. The magnesium in the block can cause electrochemical corrosion from contact with other materials such as iron. As a result, steel bolts cannot be used in engine assembly and BMW has specified the use of specially designed aluminum stretch bolts.”

“However, to ensure proper fastening these bolts are designed for ‘one-time-use’ only,” Swyter notes. “Reusing them or using the wrong bolts can result in improper torqueing, loosening, breakage, or thread damage in the block.

The new line of stretch bolts from Rein Automotive is designed as a direct replacement for the OE bolts and meets BMW specifications.

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