Technical Reference
Access comprehensive charts, specifications, interactive tools, and conversion tables. Everything you need to identify, measure, and select the right fastener.
Your Complete Fastener Resource Library
From quick reference tools to detailed specification charts, we've compiled the most useful technical resources in one place. Whether you need to identify a thread, look up torque specs, or convert measurements, you'll find it here.
Interactive Tools & Calculators
Get instant answers with our 8 free online calculators
Thread Identification Tool
Identify thread pitch and type by measuring your fastener. Works for both inch and metric threads.
- Measure threads per inch or pitch
- Identify coarse vs. fine threads
- Match to standard sizes
- Visual comparison guide
Torque Specification Calculator
Calculate recommended torque values based on fastener size, grade, and application.
- Torque specs by size and grade
- Dry vs. lubricated conditions
- Multiple unit conversions
- Safety factor recommendations
Drill & Hole Size Calculator
Find the correct drill bit size for tapping threads or clearance holes.
- Tap drill sizes for threads
- Clearance hole recommendations
- Close, normal, and loose fits
- Inch and metric sizes
Unit Conversion Calculator
Convert between inch and metric, torque units, strength grades, and more.
- Inch to metric and back
- Torque unit conversions
- Grade equivalents (SAE/Metric)
- Decimal to fraction
Rivet Size Calculator
Calculate the correct rivet size and grip range based on material thickness.
- Pop, solid, and structural rivets
- Grip range recommendations
- Material type guidance
- Hole size specifications
Screw Length Calculator
Determine the correct screw length for your materials and application.
- Wood, metal, and drywall screws
- Countersink depth consideration
- Material-specific penetration
- Visual length breakdown
Washer Size Selector
Find the correct washer type and size for your bolt or screw.
- Flat, fender, and lock washers
- Inside/outside dimensions
- Material recommendations
- Application guidelines
Pilot Hole Calculator
Calculate the correct pilot hole size to prevent wood splitting when driving screws.
- Wood screw sizes #2 through 3/8"
- Softwood to very hard wood types
- Edge distance consideration
- Body vs thread hole sizing
Charts & Specifications
Download or view detailed reference charts
Tap & Drill Chart
Complete guide to tap drill sizes for creating threaded holes in metal and other materials.
PDFBolt Torque Specifications
Recommended torque values for different bolt grades, sizes, and applications.
PDFThread Pitch Chart
Unified and metric thread specifications with pitch, diameter, and tap drill info.
PDFNut Dimensions Chart
Hex nut sizes, wrench sizes, and thickness specifications for all standard sizes.
PDFHead Styles & Dimensions
Visual guide to screw and bolt head styles with dimensional specifications.
PDFGrade Markings Guide
Identify bolt and screw strength grades by head markings and material properties.
PDFClearance Hole Chart
Recommended hole sizes for close, normal, and loose fit clearances.
PDFWasher Specifications
Flat washer and lock washer dimensions for all standard bolt sizes.
Material Properties
Tensile strength, hardness, and characteristics of common fastener materials.
Additional Resources
How to Measure Fasteners
Step-by-step guide to properly measuring screws, bolts, and other fasteners to identify the correct size.
Fastener Identification Guide
Learn to identify fastener types, head styles, drive types, and materials by visual inspection.
Industry Standards
Overview of ANSI, ISO, SAE, and other fastener standards and what they mean for your applications.
Technical Glossary
Comprehensive dictionary of fastener terms, abbreviations, and technical jargon explained in plain language.
Most Popular Quick References
Access our most-used reference materials
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