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More Than Just Hardness: What Really Goes Into a Grade 10.9 Bolt?
When it comes to heavy-duty machinery or structural steelwork, Grade 10.9 bolts are often the "unsung heroes." They sit in that sweet spot of high tensile strength and reliable ductility.But at LONSE, we often get asked by clients: "What actually makes a bolt a 10.9? Is it just the material, or is there more to the story?"The truth is, a 10.9 bolt isn’t born; it’s made through a precise, high-stakes manufacturing journey. Here is a look...Read more -
The Role of Flat Washers in Steel Structure Bolted Connections
Introduction: Small Component, Big ImpactIn steel structure construction, engineers often focus on the strength of bolts and the quality of steel members. However, many connection failures are not caused by bolt breakage, but by improper load distribution at the joint.Flat washers, though small and often overlooked, play a critical role in ensuring the safety, durability, and long-term performance of steel building connections.Read more -
Why Flat Washers Are Critical in Steel Building Connections
Small Part, Big RiskIn steel construction, structural safety is often linked to “big components” — beams, columns, and high-strength bolts. Yet industry statistics present a shocking reality: 38% of steel connection failures are associated with the improper use of flat washers.In one industrial case, a 3-story factory suffered bolt loosening, causing a column displacement of 18 mm. The repair cost exceeded USD $120,000 — all because flat wash...Read more -
High-Strength Bolts for Steel Structures: A Complete Guide (Advanced Engineering Edition)
In modern steel structure engineering, high-strength bolts represent far more than a simple fastening component—they are the core transmission elements that guarantee joint rigidity, seismic resilience, and long-term structural integrity. In critical steel connections, the performance of the bolts often determines the safety margin of the entire structure. This in-depth guide explains not only what high-strength bolts are, but also why they matter, how t...Read more -
Tianjin Longshi Fasteners × China Energy Group
From Component Supplier to Engineering-Grade Fastening Solution Partner Over a Decade of Cooperation1. From “Qualified Supplier” to “Engineering Partner”Before 2012, key fastening components for China’s heavy-haul railway and energy infrastructure relied heavily on imported products. Domestic high-strength fasteners struggled to satisfy requirements for fatigue life, anti-loosening performance, and extreme temperature/pressure environments.Read more -
How Longshi Provides Reliable Fastener Solutions for Low-Temperature Projects
Low-temperature environments increase the risk of brittle fracture in fasteners used for pipelines, petrochemical plants, LNG facilities, and high-altitude structures. This article introduces Longshi’s professional fastener solutions designed to ensure bolt safety from –20°C to –60°C.1. The Challenge of Low-Temperature Bolt FailureWhen steel operates below its ductile–brittle transition temperature, it loses toughness rapidly. For pipelines, c...Read more -
China–Russia Energy Pact Boosts Global Fastener Export Momentum in 2025
The newly signed China–Russia natural gas transport agreement reshapes infrastructure investment and opens new opportunities for Chinese fastener exporters.A New Chapter for Energy and Infrastructure CollaborationIn early September 2025, China and Russia finalized a landmark agreement to advance the Power of Siberia 2 pipeline, a major energy corridor that will deliver up to 50 billion cubic meters of natural gas annually to C...Read more -
TIANJIN LONGSHI FASTENERS Company History and Development
Company OverviewTIANJIN LONGSHI FASTENERS was established in 2008 and is headquartered in Hebei Province, China. The company focuses on the production of high-quality fasteners, including bolts, nuts, washers, screws, and anchors. From its early days, LONGSHI FASTENERS quickly gained recognition in the domestic market due to its excellent product quality and customer service. As the demand for high-quality fasteners increased globally, LONGSHI expanded its reach and...Read more