Ningbo Zhongli bolts manufacturing co.ltd

Ningbo Zhongli bolts manufacturing co.ltd We are professional in producing High strength Hex bolt/Socket screws, stud bolts B7&2H nuts, washer, please contact whatsapp/wechat: 008615257861940.

We are a factory, not a retailer, our MOQ is 500kgs per size. https://www.pinterest.com/zylhardware/

04/09/2026

Do you know how to do heat treatment for high strength Bolts,nuts,washers?

Let me show you!

27/08/2026

We are high strength Hex bolts in Ningbo China, if you have inquiry,please contact me by email: [email protected].
Whatsapp/wechat:0086 15257861940

18/08/2026

Dacromet bolt packaging workshop
ZYL brand high strength Hex bolt. Whatsapp: 0086 15257861940

17/08/2026

This is hardness test for high strength Hex bolts.
The difference between the surface hardness and core hardness of the bolt must not exceed 30 HV= 3 HRC; any deviation beyond this range is considered unqualified (excessively high surface hardness may indicate carburization, while excessively low hardness may suggest decarburization), so for Gr8.8 M30, raw material must be 40Cr or better raw material.

14/08/2026

Do you know the hot forging production process for bolts? How many steps are there? I took two videos to demonstrate it

13/08/2026

If you are concerned that long bolts are prone to bending, please take a look at how our process avoids this problem

12/08/2026

Spain customer visited our factory and took photos of our production machines.
High strength hex bolts factory workshop.

11/08/2026

do you know how many ways to make threaded rolloing for stud bolts?

10/08/2026

How you can find real high strength grade bolts,nuts,washers?

Address

浙江省宁波市镇海区九龙湖镇田顾村
Ningbo
315205

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