Designing joints based on the minimum expected preload generated by the bolt eliminates any risk of loosening. However, designing based on the average preload without applying a "safety factor" may lead to the loosening of many bolts. It is also necessary to account for preload loss due to embedding Read More

Cold Forging and Its CharacteristicsCold forging, also known as cold extrusion, is a subset of cold extrusion. Cold extrusion encompasses a broader range of techniques. Machines commonly used in cold extrusion include hydraulic presses, punch presses, and automatic cold forging machines. The key fea Read More

In various engineering applications, particularly for corrosion protection or decorative purposes, fastener surface coatings are widely applied, including electroplating, non-electrolytic zinc flake coating (Dacromet), and hot-dip galvanizing. However, due to different coating processes and varying Read More

1. BackgroundOn November 28, 2021, a research team led by Professor Han Dong from the School of Materials Science and Engineering at Shanghai University, in collaboration with Hebei Longfengshan Foundry Co., Ltd., Qifeng Precision Technology Co., Ltd., Zhoushan 7412 Factory, Jiangsu Metallurgical Te Read More

In the process of bolt use, flat washers and spring washers each play an indispensable role, so how should we choose? Let's talk about it today.Flat washersHow to choose flat washers? Flat washers are used as a part to prevent bolts and nuts from locking. Flat washers are used wherever fasteners are Read More

Thread inspection disputes and inspection rule characteristicsThread inspection is one of the most controversial events in trade. Due to the inconsistency of thread inspection methods and rules, thread gauges sometimes "fight". Different coatings on the surface of threaded fasteners, thread gauge di Read More

In the process of bolt use, flat washers and spring washers each play an indispensable role, so how should we choose? Let's talk about it today.Flat washersHow to choose flat washers? Flat washers are used as a part to prevent bolts and nuts from locking. Flat washers are used wherever fasteners are Read More

Principles and methods of thread inspectionThread inspection is one of the most controversial events in trade. Due to the inconsistency of thread inspection methods and rules, thread gauges sometimes "fight" with each other. Different coatings on the surface of threaded fasteners, thread gauge dispu Read More

① Bolts: Bolts are generally matched with nuts (usually with one or two washers) and are used in occasions where they play a connecting and tightening role.② Nuts: Nuts are used in combination with bolts.③ Screws: Screws are usually used alone (sometimes with washers) and generally play a tightening Read More

Steps of photovoltaic power generation1. Solar cell production: This is the core component of photovoltaic power generation, which converts light energy into electrical energy through semiconductor materials.2. Battery module packaging: Connect and package multiple battery cells to form a component Read More

Shanghai - From June 13 to 15, 2024, the annual global photovoltaic industry event - SNEC 17th (2024) International Solar Photovoltaic and Smart Energy (Shanghai) Conference and Exhibition was grandly held at the National Exhibition and Convention Center (Shanghai). Haina brought its latest develope Read More

1. Color steel tile solar roof mounting systemDescription: The above fixture + rail installation method is suitable for light steel structure color steel tile roof. According to the different types of color steel tiles, choose the appropriate matching fixture.2. Tile roof solar bracket mounting syst Read More

Hot dip galvanizing is to make molten metal and iron matrix reaction and produce alloy layer, so as to combine the matrix and coating. Hot dip galvanizing is the first steel parts pickling, in order to remove iron oxide on the surface of steel parts, pickling, through ammonium chloride or zinc chlo Read More

First of all, stainless steel screws have strong corrosion resistance, high temperature resistance, and good anti-rust performance. However, they are not completely immune to external environmental erosion, and they will still rust in some harsh environments.1. The surface of stainless steel has dus Read More

A special type of nut used to weld nuts on thin plates with a spot welder. It is mainly used for sealing plate, panel and other structural parts of welding nut required by electronic panel cabinet of locomotive. Its advantages are high production efficiency, good performance, low energy consumption, Read More

304 stainless steel is one of the most widely used chromium - nickel stainless steel, as a widely used steel, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Stamping, bending and other thermal processing, no heat treatment hardening phenomenon (u Read More

3.1 The full name of the certificate shall be "Fastener test Report F3.1", which is derived from ISO16228 "Types of Fastener Test Documents". The standard mainly provides the content required for fastener product test report, that is, the requirements for product test report, rather than the so-call Read More

Reasons for bolt breakage:1.the quality of the bolts2.the strength of the bolt3.pretightening torque of bolts4.Fatigue strength of boltsUnqualified materials, unqualified heat treatment, unqualified product manufacturing, unreasonable bolt selection, harsh use environment, etc. all have a direct imp Read More

How to choose between coarse thread and fine thread? To what extent can a thread be called a fine thread? We might as well define it this way. Coarse threads can be defined as standard threads; while fine threads are relatively coarse threads. Under the same nominal diameter, the number of teeth per Read More

The market at present there are a few quick inspection method of stainless steel fasteners, true and false, if stainless steel liquid and the magnet, but after many years, the two methods are not scientific, the reason is that drug testing potion is numerous, stainless steel composition is complic Read More