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 & assembly7 articles
ASTM A193 & A194
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Overview
ASTM A193 and A194 Guide: B7 vs B8, Grades and Nuts
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ASTM A193 Grade B7: Material, Strength and Specification
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ASTM A193 Grade B7M: Material, Strength and B7 Comparison
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ASTM A193 Grade B8: Material, Class 1, Class 2 and Class 2B
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ASTM A193 Grade B8M: 316 Stainless, Class 1 vs Class 2
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ASTM A194 Nuts: 2H, 2HM, 8 and 8M Explained
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ASTM A193 Bolt and ASTM A194 Nut Compatibility Guide
Surface treatments4 articles
Dacromet & zinc-flake coatings
Copper alloy materials2 articles
Copper, brass & bronze
More engineering guides
- 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...
- bolt markings · bolt strength Grade 5 vs Grade 8 Bolts: Strength, Markings and Applications Compare SAE J429 Grade 5 and Grade 8 bolt strength, three-line and six-line head markings, applications, torque limits and mating-hardware checks.
- bolt sizes · fastener drawings How to Read Bolt Sizes: Metric and Inch Callouts Explained Read metric and inch bolt sizes, numbered screw diameters and thread classes, then use the right drawing to check head dimensions and...
- engineering guide · galling Installing Titanium Fasteners: Torque, Galling and Preload Control Why a steel torque chart fails on titanium bolts, how galling hides inside a torque reading, which lubricants and nut treatments are...
- 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,...
- corrosion · engineering guide Titanium Fasteners: Grades, Benefits and Applications A clear introduction to titanium bolts, screws, nuts and washers: why designers use them, which grades matter, where titanium works well and...
- corrosion · galling Choosing Grade 2 or Grade 5 Titanium Fasteners A practical guide to choosing Grade 2 or Grade 5 titanium fasteners, covering strength, stiffness, corrosion limits, galling and galvanic compatibility.
- bolt strength · engineering guide Bolt Grades 8.8, 10.9 and 12.9: What the Numbers Really Mean The 8.8, 10.9 and 12.9 marks encode nominal strength—not torque or complete joint capacity. This guide explains the numbers and the checks...
- engineering guide · inch fasteners UNC and UNF Threads: How Pitch Changes Joint Performance Pitch changes more than thread count. See how UNC and UNF differ in tensile area, engagement, adjustment and real assembly behaviour.