From basic specifications to advanced techniques — become a screw identification expert
What is the M series? What's the difference between UNC and UNF? Thread pitch, thread angle, head type classification — understand the fundamentals of screw specifications.
How to use calipers? How to use thread pitch gauges? The difference between outer diameter, pitch diameter, and head diameter — a step-by-step guide to precisely measuring every dimension.
Phillips, slotted, hex, socket, Torx, pan, flat, truss — identification features and use cases for every screw head type.
How does computer vision "see" a screw? The deep learning model training process, identification workflow, and how to improve accuracy.
The buyer's complete guide for fastener engineers — standards coverage (DIN/ISO/ASME/JIS/GB), accuracy ranges, photo guidelines, engineering workflow integration, and how purpose-built fastener AI differs from generic image classifiers.
Standard M6 coarse (1.00mm) and fine (0.75mm) pitch reference, tap drill sizes, ISO 261 tolerances, and identification tips for M6 vs 1/4-20 imperial lookalikes.
Full-thread hex bolt reference — M3 to M64 dimensions, head sizes across flats, ISO 4017 equivalence, strength classes, and how DIN 933 differs from partial-thread DIN 931.
Cold-heading blank diameter calculation for M8 with Fe/Zn electroplating compensation. Formula ΔD ≈ 4 × coating thickness, class 6g tolerance impact, and rolling die specification.
Screws may seem simple, but they are precision engineering components. A single screw's specification includes over a dozen parameters: outer diameter, thread pitch, thread angle, head type, drive type, length, material, surface treatment, and more. Choosing the wrong specification can lead to:
Whether you're a veteran or a beginner, this knowledge will help you make more accurate decisions. Combined with Screw Genius's AI identification tools, screw identification becomes easier than ever.