Key Advantages for Your Applications: Increased Assembly Efficiency: Single-wrench installation saves time and reduces labor costs in automotive production. Tamper Resistance: The round head makes it difficult to loosen the bolt from the head side, enhancing security in certain applications. Flush and Clean Appearance: The cup head provides a smooth, low-profile finish, improving the aesthetics of the assembly. Secure and Reliable Fastening: The square neck prevents rotation, ensuring a tight and durable connection. Wide Range of Applications: Suitable for various automotive components and systems. Standardized Dimensions: DIN 603 is a well-established standard, ensuring interchangeability and ease of sourcing. Ideal for: Seat Mounting: Securing automotive seats to the floor pan, providing a strong and safe connection. Interior Trim Panels: Fastening door panels, kick panels, and other interior trim components with a flush finish. Exterior Body Panels: Attaching certain exterior panels where a smooth appearance and secure fastening are required. Bumper and Fascia Mounting: Securing plastic bumpers and fascias to the vehicle frame. Wiring Harness and Cable Management: Securing brackets and clamps for wiring harnesses and cables. Battery Trays and Mounting: Fastening battery trays and other components within the battery system. Undercarriage Protection: Securing shields and covers to the vehicle undercarriage. Product NameStandardMaterial & FinishDiameterLengthCup Head Square Neck BoltsGB/T 12-2013Carbon Steel, Zinc PlatedM620 mmCup Head Square Neck BoltsGB/T 12-2013Carbon Steel, DacrometM825 mmCup Head Square Neck BoltsGB/T 12-2013Alloy Steel, Black OxideM1030 mmCup Head Square Neck BoltsISO 8677:198834CrMo4 Steel, GalvanizedM6 (1/4")1.5" (38.1 mm)Cup Head Square Neck BoltsISO 8677:198842CrMo4 Steel, PlainM8 (5/16")2" (50.8 mm)Cup Head Square Neck BoltsASME B18.5 T2-2012SAE J429, Zinc Flake3/8" (9.525 mm)1.5" (38.1 mm)Cup Head Square Neck BoltsDIN 603:2017C35 Steel, Hot-Dip GalvanizedM620 mmCup Head Square Neck BoltsDIN 603:2017C45 Steel, PhosphatedM1030 mmCup Head Square Neck BoltsJIS B 1171:2005SCM435 Alloy Steel, Zn-NiM825 mmCup Head Square Neck BoltsQC/T 597-201135CrMo Steel, ElectroplatedM1240 mmCup Head Square Neck BoltsBS 325:1947BS 3692 Carbon Steel, Black1/4"1" (25.4 mm)Cup Head Square Neck BoltsAS/NZS 1390:1997Stainless Steel A2-70M620 mm