HexFastener Resources
Engineering Guides
Practical references for buyers and engineers sourcing industrial fasteners — threads, property classes, materials and coatings, written from production experience.
Bolting materials & assembly
ASTM A193 and A194 Guide: B7 vs B8, Grades and Nuts
Surface treatments
Dacromet and Zinc-Flake Coatings for High-Strength Fasteners
Copper alloy materials
Copper, Brass and Bronze Fasteners: Where Each Material Fits
Material selection & installation
Titanium Fasteners: Grades, Benefits and Applications
Size, thread, grade & finish
How to Specify a Bolt: Size, Thread, Grade, and Finish
More engineering guides
- black oxide · corrosion Why Do Black Oxide Bolts Rust—and Should You Use Zinc Plating Instead? Find out why black oxide bolts rust, when zinc plating is the better choice, and what thread-fit, torque and hydrogen controls belong...
- austenitic · ISO 3506 What Is Austenitic Stainless Steel? A Fastener Buyer's Guide Austenitic means a nickel-stabilized crystal structure — and that structure explains cold-worked strength, cryogenic toughness, weak magnetism and galling in 304 and...
- galling · installation Why Stainless Threads Seize: Galling and How to Prevent It Stainless threads can cold-weld before the joint reaches preload. The mechanism, the warning signs, and the four controls that actually prevent galling.
- 35CrMo · 4135 How to Read Chinese Alloy Structural Steel Grades: 35CrMo and 42CrMo Learn how Chinese alloy structural steel grade names work, what 35CrMo and 42CrMo mean, and why 4135, SCM435 and 34CrMo4 are similar—not...
- locking · selection guide Do Lock Washers Work? Washers, Locking Methods and Sixty Years of Vibration Data Transverse vibration, not axial load, loosens bolted joints — and the helical split lock washer has failed that test since 1969. What...
- 304 · 316 304 vs 316 Stainless Steel Fasteners: What the Data Says The two grades have identical strength at the same property class — the difference is 2% molybdenum and where it matters. Composition,...