Technical Resources
Technical Resources
Engineering reference guides, specification charts, and technical data for fastener selection and installation.
Torque & Installation
Bolt Torque Chart
Recommended tightening torque values for Grade 5 and Grade 8 bolts. Dry and lubricated specs.
Grade 5 Torque Chart
Complete torque specifications for SAE Grade 5 fasteners, 1/4" through 1-1/2".
Grade 8 Torque Chart
Complete torque specifications for SAE Grade 8 fasteners, 1/4" through 1-1/2".
Metric Torque Chart
Torque values for Class 8.8, 10.9, and 12.9 metric fasteners.
Torque Fundamentals
Everything you need to know about proper fastener torque and preload.
Grades & Specifications
Bolt Grade Chart
Complete reference for SAE grades, ASTM specs, and metric property classes.
Bolt Grades Explained
Understanding Grade 2 vs Grade 5 vs Grade 8 — when to use each.
Grade 5 vs Grade 8
Side-by-side comparison of strength, applications, and cost considerations.
Metric vs SAE Grades
Cross-reference between metric classes (8.8, 10.9, 12.9) and SAE grades.
ASTM Specifications
Understanding A307, A325, A490, F1554, and other structural specs.
Threads & Sizing
UNC vs UNF Threads
When to use coarse vs fine threads. Advantages, applications, and specs.
Imperial Thread Chart
Complete UNC and UNF thread specs with TPI, tap drills, and clearance drills.
Metric Thread Chart
Metric coarse and fine thread pitches with tap and clearance drill sizes.
Wrench Size Chart
Hex bolt and nut wrench sizes for inch and metric fasteners.
Materials & Coatings
Materials & Coatings Guide
Steel, stainless, brass, aluminum, nylon. Plus zinc, galvanized, black oxide, and more.
Stainless Steel Grades
Understanding 18-8, 304, 316, and other stainless classifications.
304 vs 316 Stainless
When to use 304 vs 316 — corrosion resistance, cost, and applications.
Zinc vs Galvanized
Comparing zinc plating and hot-dip galvanizing for corrosion protection.
Head & Drive Types
Head Styles Guide
Visual guide to pan, flat, hex, truss, oval, and other head types.
Drive Types Guide
Phillips, slotted, Torx, hex, square — when to use each drive type.
DIN & ISO Standards
DIN to ISO Conversion
Cross-reference chart between DIN and ISO fastener standards.
DIN 912 Socket Caps
Specifications and dimensions for DIN 912 socket head cap screws.
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