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A2-70 vs A4-80 Stainless Steel Bolts: 304 or 316?
A2-70 is 304 stainless; A4-80 is 316 stainless. A4-80 is stronger and more corrosion-resistant but costs 30% more.
Read MoreWhat Is a Wire Thread Insert and When Do You Need One?
Wire thread inserts reinforce threads in soft materials like aluminum and repair damaged threads. This article explains
Read MoreRivet vs Bolt: MIL-STD-1759 Aerospace Selection Guide
MIL-STD-1759 defines rivet selection for aerospace. Solid rivets for permanent accessible joints; blind rivets for one-s
Read MoreWhat Is Hydrogen Embrittlement and Why Do High-Strength Bolts Suddenly Fracture?
Hydrogen embrittlement causes high-strength steel bolts to fracture suddenly after months in storage. Bolts above 1000 M
Read MoreA325 vs A490 Structural Bolts: Which One to Choose
A325 and A490 are the two most common high-strength structural bolts in North America. RCSC specification defines their
Read MoreUNJ vs UN Threads: Why Aerospace Fasteners Use a Different Thread Form
UNJ threads increase the root radius of internal threads, dramatically improving fatigue life. NASA-STD-5020 requires UN
Read MoreWhy Preload Matters: Lessons from NASA Spaceflight Fastener Standards
Preload is the most misunderstood parameter in bolted joint design. NASA-STD-5020 devotes an entire chapter to preload c
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