QAre you a manufacturer or trading company?
Qingdao Tongkuai Industrial Technology Co., Ltd. is a professional fastener manufacturer and supplier based in China. We have our own production, quality inspection and technical support capabilities, while also integrating qualified supply-chain resources to provide customers with a wider range of standard and customized fasteners.
QWhat types of fasteners do you manufacture and supply?
We supply a wide range of industrial fasteners, including bolts, nuts, screws, washers, threaded rods, studs, locking fasteners, stamping parts, CNC machined parts and customized non-standard components. Products can be manufactured according to DIN, ISO, ANSI, ASME, ASTM, GB, JIS and customer-specific standards.
QWhat materials are available for your fasteners?
Our commonly used materials include carbon steel, alloy steel, stainless steel, brass, copper, titanium, engineering plastics and special alloys. Typical material options include stainless steel 304, 316 and 316L, alloy steel 35CrMo and 42CrMo, as well as different carbon steel strength grades. Material selection can be recommended according to the application environment and performance requirements.
QWhat strength grades and surface treatments can you provide?
We can supply fasteners in various strength grades, including 4.8, 5.8, 8.8, 10.9 and 12.9, as well as stainless steel grades such as A2-70, A4-70 and A4-80. Available surface treatments include zinc plating, hot-dip galvanizing, black oxide, zinc-nickel coating, Dacromet, Geomet, phosphating, passivation and PTFE coating.
QCan you manufacture customized fasteners according to drawings or samples?
Yes. We provide OEM and customized fastener manufacturing services based on customer drawings, samples or technical specifications. Our team can evaluate the material, dimensions, tolerances, mechanical properties, surface treatment and inspection requirements before quotation and production.
QCan you provide material certificates and inspection reports?
Yes. Material certificates, dimensional inspection reports, mechanical property reports, coating reports and other quality documents can be provided according to the product and order requirements. EN 10204 3.1 or third-party inspection can also be arranged when specified before order confirmation.