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FAQs — 20 articles
FAQ2026-10-12
Fastener Surface Treatment: Zinc, Dacromet, Zinc-Nick, Black Oxide Compared
How to choose fastener surface treatment? Compare zinc plating, dacromet, zinc-nick, and black oxide on corrosion life, hydrogen embrittlement risk, and cost…
~8 min readRead More →
FAQ2026-10-12
How Is Fastener Salt Spray Testing Done? How Many Hours Counts as Pass?
Based on GB/T 10125-2012 / ISO 9227, understand the three salt spray methods (NSS, AASS, CASS), their solution, temperature, and settlement parameters, test…
~8 min readRead More →
FAQ2026-10-12
How to Choose Bolt Property Class: 8.8, 10.9, 12.9 or Stainless Steel?
What do 8.8, 10.9, 12.9 mean on bolt heads? When to use A2-70 stainless?
~8 min readRead More →
FAQ2026-10-12
Fastener Selection Guide: How to Choose by Working Condition
Fastener selection weighs application, load, environment, assembly and standards. A practical guide to load classes, 304/316L/Hastelloy/titanium and Dacromet.
~8 min readRead More →
FAQ2026-10-12
How to Set Tightening Torque: Why Bolts Loosen or Strip Even at Spec
What is the relationship between torque and preload? Why do bolts loosen even when torqued to spec?
~8 min readRead More →
FAQ2026-10-12
Fastener Material and Coating Selection by Corrosion Environment
How to match fastener material and coating to corrosion severity: 304 and 316 stainless, Hastelloy, Inconel, passivation, zinc plating, Dacromet, phosphating.
~8 min readRead More →
FAQ2026-10-12
Reading Bolt Head Markings: Property Class Identification Guide
What do 8.8, 10.9, 12.9 on the bolt head mean? Based on GB/T 3098.1-2010 section 5, the left number is tensile strength, the right number is yield ratio, plus…
~8 min readRead More →
FAQ2026-10-12
Rivet Nut Slipping or Off-Center: Common Installation Problems Solved
When a rivet nut spins with the bolt, pulls out, or installs crooked, the cause is usually in the hole preparation, tool stroke, or head style selection.
~8 min readRead More →
FAQ2026-10-12
Precision Electronics and Semiconductors: Fastener Demands
Micron tolerances, Class 100 cleanliness, low permeability, corrosion resistance and light weight: five demands semiconductors place on fasteners.
~8 min readRead More →
FAQ2026-10-12
Stainless vs Carbon Steel Bolts: Balancing Corrosion, Strength, and Cost
How to choose between 304/316 stainless and 8.8/10.9 carbon steel bolts?
~8 min readRead More →
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