Automotive Bolts

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Product Introduction

Key Numbers You Can Trust

Parameter	Value Range
Standard	QC/T 598-2013, GB/T 3098.1-2024
Strength Grade	10.9 grade, tensile ≥1040MPa
Thread Precision	Fine / coarse thread, class 6g
Fatigue Performance	1 million cycles without break
Hardness & Straightness	HRC32-39; straightness ≤0.02mm/100mm

Where and Why You Use These Bolts

Our automotive bolts are high-strength parts made for car chassis and engines. These areas face changing loads and high heat. Normal bolts break or loosen fast. Our product follow strict OEM standards. You can find them on wheel fastening, subframe joints, control arm mounts, and engine mounts. One of our customers builds race car chassis. His wheel bolts stretched under hard braking on the track. We gave him our 10.9 grade automotive bolts. The material is ML40Cr alloy steel. We went through quenching and tempering. Tensile strength reached over 1040MPa. After ten laps on the track, the bolts had no damage.

How We Build Them Strong and Reliable

Our factory uses multi-station cold heading machines and thread rollers. We also have tensile testers and fatigue testers. Every batch gets a performance check. Our automotive bolts meet QC/T 598-2013 and GB/T 3098.1-2024. For 10.9 grade, tensile is at least 1040MPa. Thread precision is 6g for both fine and coarse threads. Fatigue life is 1 million cycles without breaking. Hardness stays between HRC32-39. Straightness is ≤0.02mm per 100mm. We also run hydrogen embrittlement tests for all 10.9 grade and above. This stops delayed cracking.

Our product go into cars from SAIC, FAW, Dongfeng, GAC, Great Wall, Geely, and Chery. We support EXW, FOB, CIF, and CFR. Lead time is about one week for standard items. Bulk orders get volume discounts. Packing is moisture-proof bags plus thick export cartons.

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