Industrial Bolts Manufacturer
Ningbo Teng Qi Fasteners Co., Ltd. is a ISO9001 certified bolts manufacturer and supplier specializing in the production of high-quality standard and custom bolts for global customers. With advanced manufacturing equipment and experienced production teams, we are capable of producing bolts in various materials, specifications and international standards, including DIN, ISO and ASME/ANSI requirements. Our product range covers stainless steel bolts, carbon steel bolts and customized fasteners manufactured according to customer drawings and technical requirements.
We manufacture a wide variety of industrial bolts, including hex bolts, square head bolts, shoulder bolts, T bolts, flange bolts, anchor bolts, countersunk bolts, carriage bolts and u-bolts. Our production capabilities include cold heading, forging, machining and precision processing to ensure accurate dimensions, reliable mechanical performance and consistent quality for different industrial applications.
To meet different environmental and performance requirements, we provide various surface treatment options, including hot dip galvanizing, zinc plating, black oxide, nickel plating, Dacromet coating and stainless steel passivation. Combined with strict quality control procedures and professional inspection equipment, we deliver reliable bolt solutions for customers in construction, machinery, automotive, energy and other industries worldwide.
Types of Bolts
Industrial bolts are mechanical fasteners designed to securely join two or more components together, typically used with nuts and washers to create strong and reliable connections. Unlike screws that are often installed directly into threaded holes, bolts are commonly used in applications where high clamping force, structural stability and easy assembly or disassembly are required. Industrial bolts are widely used in machinery, construction, automotive, energy, transportation and other industrial applications.
Industrial bolts are available in various designs, materials and specifications to meet different application requirements. Common types include hex bolts, flange bolts, carriage bolts, anchor bolts, socket head bolts, shoulder bolts and customized bolts. Depending on the working environment and performance requirements, bolts can be manufactured from materials such as stainless steel, carbon steel, alloy steel, brass and aluminum, with different surface treatments available to improve corrosion resistance and durability.
Material&Mechanical Property of Bolts:
| Standard | Common Grade/Class | Material |
|---|---|---|
| ISO898-1 | 4.8,8.8,10.9,12.9 | Carbon Steel& Alloy Steel |
| SAE J429 | Grade5&Grade8 | Carbon Steel& Alloy Steel |
| ASTM F3125/F3125M | A325 | Carbon Steel& Alloy Steel |
| ASTM F3125/F3125M | A490 | Alloy Steel |
| ASTM A394 | Type0, Type1 | Carbon Steel& Alloy Steel |
| ASTM A193/A193M | B7,B7M,B8,B8M,B16 | Alloy Steel&Stainless Steel |
| ASTM F593 | Group1 Group2 | Stainless Steel |
| ISO 3506-1 | A2-70 | 304 & 304L Stainless Steel |
| A2-80 | 304 & 304L Stainless Steel | |
| A4-70 | 316 & 316L Stainless Steel | |
| A4-80 | 316 & 316L Stainless Steel |
Industrial Bolt Manufacturing Process:
Cold Heading
Thread Rolling
Hot Forging
Quality Control of Manufacturing Bolts:
Quality control is an essential part of our bolt manufacturing process. As an ISO9001 certified bolt manufacturer, we implement strict quality management procedures from raw material inspection to final shipment. Our quality control system ensures that every bolt meets customer requirements regarding material properties, dimensional accuracy, thread performance, mechanical strength and surface finish.
We use professional inspection equipment and testing methods to verify critical parameters throughout production. Our quality control process includes material verification, dimensional measurement, thread inspection with go/no-go gauges, mechanical property testing, hardness testing and surface coating thickness inspection. Whether producing standard DIN, ISO, ASME/ANSI bolts or customized bolts according to drawings, we are committed to providing reliable and consistent fastening solutions for customers worldwide.
| Inspection Item | QUality Control Method |
|---|---|
| Raw Material Inspection | Material grade verification, chemical composition and mechanical property checking |
| Dimensional Inspection | Checking bolt diameter, length, head dimensions and tolerances according to drawings and standards |
| Thread Inspection | Go/no-go gauge testing to ensure accurate thread size, pitch and fitting performance |
| Mechanical Testing | Tensile strength, hardness and load performance testing |
| Surface Treatment Inspection | Coating thickness measurement and surface finish inspection |
| Final Inspection Before Shipment | Appearance, quantity, packaging and specification verification before shipment |
Standard of Bolts we produce
ASME/ANSI American Standard:
A193 B7 Stud Bolts A193 B16 Stud Bolts A193 B8 SS304 Stud Bolt A193 B8M SS316 Stud Bolts ASME B 18.2.1 Square Head Bolts ASME/ANSI B18.5 80°Slotted Countersunk Head Bolts ASME/ANSI B18.5 T- Head Bolts A307 Hex Bolts A325 Heavy Hex Bolts
A490 Heavy Hex Structural Bolts ASME/ANSI B18.2.1 Hex Head Flange Bolts ASME/ANSI B 18.5 Round Head Square Neck Bolts ASTM A394 Steel Tower Bolts American Standard A193 B7 Threaded Rods ASME B 18.31.5 HRA Hook Bolts ASME B18.2.1 Hex Bolts
DIN Germany Standard:
A2-70 Stainless Steel Hex Bolt A2-80 Stainless Stee Hex Bolt A4-70 Stainless Steel Hex Bolt A4-80 Stainless Stee Hex Bolt DIN6914 High-Strength Hex Bolts DIN931 Half Thread Hex Bolts DIN933 Full Thread Hex Bolts Duplex Stainless Steel 2205 Hex Bolt A2-70 Stainless Steel Threaded Rod A2-80 Stainless Steel Threaded Rod A4-70 Stainless Steel Threaded Rod A4-80 Stainless Steel Threaded Rod DIN444 Eye Bolts
ISO International Standard
ISO4014 Half Thread Hex Bolts ISO4017 Full Thread Hex Bolts
GOST Russia Standard
GOST 7798 Russian Standard Hex Bolts GOST 52644 Russia High-Strength Structural Hex Bolt