Technical fasteners · San Diego, California
Metric & inch fasteners for technical applications
Stainless steel screws, nuts, washers and PCB standoffs with practical dimensional information for confident selection.
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Metric & UnifiedClearly identified thread systems
DIN & ISO referencesStandards context where applicable
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Technical resourcesCharts and practical selection guides
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Identify the thread system, nominal diameter, pitch, material and applicable product standard before ordering or replacing a fastener.
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Latest fastener guides
Thread Pitch Chart: UNC, UNF & Metric Thread Sizes
Identify common Unified inch and ISO metric screw threads with UNC, UNF, TPI, and metric-pitch charts, plus practical measurement guidance.Read guide →
M3 or #4-40: why they are not interchangeable
Compare M3 × 0.5 and #4-40 UNC dimensions, learn why the threads are not interchangeable, and identify them without damaging the mating part.Read guide →Need help identifying a part?