描述

本款12.9级车轮螺栓专为汽车、商用车及工程机械轮毂连接场景设计，采用优质合金结构钢（如40Cr/42CrMo），经调质热处理与表面强化工艺，达到12.9级高强度性能等级，具备极高的抗拉强度、屈服强度与抗疲劳性能，可承受车辆高速行驶、颠簸路面及重载工况下的极端载荷与交变应力。

螺栓采用高精度滚压螺纹工艺，牙型清晰、公差精准，与轮毂螺母配合紧密，有效防止松动与滑牙；头部法兰盘经特殊加工，增大接触面积，分散压紧力，避免轮毂面压溃，同时实现均匀受力，提升防松效果。表面处理可选用达克罗、热浸锌、高耐蚀彩锌等工艺，具备优异的防锈、防腐蚀与盐雾性能，适配潮湿、盐碱等恶劣环境。

产品严格遵循GB/T 3098.1、ISO 898-1等标准，每批次均经过硬度检测、拉力试验、扭矩试验、疲劳测试及盐雾测试，出厂100%全检，确保尺寸精度与力学性能稳定可靠，为车辆行驶安全提供关键保障。支持按客户需求定制规格、牙型、长度及表面处理，适配各类乘用车、商用车及工程机械轮毂系统。

Grade 12.9 High-Strength Wheel Bolts / Lug Bolts

These Grade 12.9 wheel bolts are specifically designed for wheel hub connections in passenger cars, commercial vehicles, and construction machinery. Manufactured from premium alloy structural steel (e.g., 40Cr/42CrMo), they undergo quenching and tempering heat treatment and surface strengthening processes, achieving Grade 12.9 high-strength performance. They feature exceptional tensile strength, yield strength, and fatigue resistance, capable of withstanding extreme loads and alternating stresses under high-speed driving, rough road conditions, and heavy-duty operations.

The bolts adopt high-precision rolled thread technology, with clear thread profiles and precise tolerances, ensuring tight fit with lug nuts to effectively prevent loosening and thread stripping. The specially processed flange head increases contact area, distributes clamping force evenly to avoid crushing of the hub surface, and enhances anti-loosening performance. Surface treatment options include Dacromet coating, hot-dip galvanizing, and high-corrosion-resistant color zinc plating, offering excellent rust, corrosion, and salt spray resistance for harsh environments such as humidity and salt spray conditions.

The products strictly comply with standards such as GB/T 3098.1 and ISO 898-1. Each batch undergoes hardness testing, tensile testing, torque testing, fatigue testing, and salt spray testing, with 100% inspection before delivery to ensure stable and reliable dimensional accuracy and mechanical performance, providing critical safety guarantees for vehicle operation. Custom specifications, thread types, lengths, and surface treatments are available to suit various passenger car, commercial vehicle, and construction machinery wheel hub systems.