Press release
FineThread 10.9 HighStrength Bolts DIN960 DIN961
They are commonly applied in automotive chassis, engine assemblies, heavyduty machinery, construction steel structures, hydraulic equipment and transmission systems. These fasteners are also preferred for thinwall components and parts subject to strong shock and alternating vibration. Finethread 10.9 bolts [https://www.cnzyl.com/fine-thread-hex-bolt-din960-black-grade-10-9-product/] can maintain stable clamping force under heavyload working conditions, effectively preventing loosening caused by vibration. Besides, they are suitable for occasions with limited assembly space where coarsethread fasteners cannot fit.
Image: https://ecdn6.globalso.com/upload/p/439/image_other/2026-09/grade-10-9-fine-teeth-full-tee.JPG
2. Quality Requirements
10.9grade finethread bolts shall comply with relevant fastener [https://www.cnzyl.com/contact-us/] standards. The core mechanical properties include minimum tensile strength [https://www.cnzyl.com/factory-video-2/] of 1040MPa and yield strength of 940MPa. Full hardness inspection is required to avoid overtempering or brittleness.
Fine thread tolerance must be strictly controlled to guarantee smooth thread fit. Surface defects such as cracks, burrs and scratches are prohibited. For antiloosening performance, thread profile shall be precise to sustain stable preload under vibration and alternating load.
If surface treatment like hotdip galvanizing [https://www.cnzyl.com/contact-us/] or Dacromet is applied, coating thickness shall be uniform. Hydrogen embrittlement relief baking is mandatory after plating to prevent delayed fracture. Dimension sampling inspection, torque test and saltspray corrosion test shall be carried out for batch validation.
3. Production Process
Raw highstrength alloy steel bars are first cut to required length. Then cold heading forms bolt head and blank body. Fine thread is produced by thread rolling instead of cutting, which improves threadfiber continuity and mechanical performance.
Subsequently, heat treatment including quenching and tempering is performed to achieve 10.9 grade mechanical properties. After heattreatment, surface descaling is done, followed by surface anticorrosion treatment. Hydrogen baking shall be arranged right after electroplating.
Final procedures cover dimensional checking, thread gauge inspection, hardness testing, visual defect screening. Qualified products are sorted and packed for delivery.
Image: https://ecdn6.globalso.com/upload/p/439/image_other/2026-09/wechat-image_20260902154539.jpg
About Us
Ningbo Zhongli Bolts Manufacturing Co., Ltd. founded in 2003, is a professional manufacturer of high-strength fasteners in different specifications for various models, which is covering an area of about 10,000 square meters, registered capital of 1500,000 RMB, with the total annual productivity of 8,000 tons per year.
Media Contact
Company Name: Ningbo Zhongli bolts manufacturing Co., Ltd.
Contact Person: Media Relations
Email:Send Email [https://www.abnewswire.com/email_contact_us.php?pr=finethread-109-highstrength-bolts-din960-din961]
Country: China
Website: https://www.cnzyl.com/
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