Focusing on Precision Fastening, Building the Core of Power

Ningbo Singel Auto Parts Co., Ltd. Specializes in Manufacturing Automotive Engine Cylinder Head Bolts

The engine is known as the "heart" of a vehicle, and cylinder head bolts are key components ensuring the sealing, strength and reliability of the engine.
Ningbo Singel Auto Parts Co., Ltd. has long been dedicated to the R&D and production of automotive engine cylinder head bolts, providing stable and reliable fastening solutions for domestic and overseas OEMs and the aftermarket with high-standard materials, precise processing and strict quality control systems.

With years of deep roots in the automotive fastener industry, we focus on the extreme working conditions of engines – high temperature, high pressure and high vibration.
Our main product is Grade 12.9 high-strength engine cylinder head bolts, made of high-quality alloy steel through a complete production process including precision cold heading, CNC machining, professional heat treatment and surface anti-corrosion treatment.
Our products feature high strength, fatigue resistance, high temperature resistance, anti-loosening performance and high dimensional accuracy, maintaining stable preload under long-term extreme conditions and effectively ensuring cylinder sealing and engine safety.

From incoming material inspection and full inspection during production, to mechanical property testing, salt spray testing and fatigue testing of finished products, the company has established a full-chain quality control system in strict accordance with the IATF16949 automotive industry quality management standard, ensuring stable performance, consistent batches and excellent uniformity of every product.
Our products are widely applied to various engines for passenger vehicles, commercial vehicles and new energy hybrid models. We have established long-term supporting cooperation with many well-known automakers, engine manufacturers and first-tier suppliers, winning market recognition with reliable quality.

Based on professional manufacturing, we empower the automotive power industry.
In the future, Ningbo Singel Auto Parts Co., Ltd. will continue to focus on engine cylinder head bolts, constantly optimize processes, upgrade equipment and enhance R&D capabilities.
We will provide high-quality core fasteners for the automotive industry with more reliable products, more efficient delivery and better services, striving to be a trustworthy professional manufacturer of cylinder head bolts for customers worldwide.