ARP 403-4707 CA625+ Head Stud Kit for BMW B48 1.6L/2.0L Engines

The ARP 403-4707 is a high-performance head stud kit designed for BMW 1.6L/2.0L B48 inline 4-cylinder engines, featuring undercut studs made from CA625+ material with 12-point nuts. CA625+ is a super-alloy that demonstrates superior fatigue cycle life, tensile strength and toughness with complete resistance to atmospheric corrosion and oxidation, with typical tensile strength of 260,000-280,000 psi.

Key Features:

• Cold-forged construction to ensure molecular integrity, heat-treated prior to thread rolling and machining
• Undercut stud design for improved clamping force and even load distribution
• 12-point nut configuration for precise installation and torque application
• Significantly stronger than standard ARP2000 and OEM head bolts
• Includes hardened parallel washers and ARP Ultra-Torque fastener assembly lubricant

ARP CA625+ head studs are the premium choice for high-performance and forced induction applications where maximum clamping force and reliability are essential. The undercut design equalizes stud stretch for more consistent cylinder head sealing under extreme combustion pressures.