Visimaster — Varad Automation & Robotics Pvt. Ltd.
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Article · 30 December 2025

Every bolt counts: what an optical inspection and sorting machine checks

A thread fault, a missing hole or a surface mark on one bolt can stop an assembly line. What the Glass Disc checks on every bolt at up to 300 PPM.

Why one bolt matters

Bolts hold everything from automotive frames to industrial machinery together. A small defect — a thread inconsistency, a misaligned hole, a surface mark — can compromise safety, halt production or damage a supplier's standing. Manual sampling does not catch it in time.

What the machine checks on every bolt

The Glass Disc Machine for Bolts Inspection carries each bolt past its camera stations at up to 300 parts per minute and sorts it automatically.

  • Thread measurement and thread defect detection
  • Hole continuity for structural integrity
  • 360° surface inspection for dents, scratches and cracks
  • OCR / OCV marking verification for traceability
  • OK / NOT-OK dual ejection for consistent sorting

What the record is worth

Every inspected bolt leaves a result with its measured values. For automotive and other high-stakes supply chains that is the traceability the customer asks for, and the image-backed reports give the production team the trend before a defect becomes a batch problem.

Beyond quality control

Delivering bolts without defects, consistently, is what makes a supplier the one the customer keeps: fewer returns, fewer complaints, and a place on the list for the critical applications.

The machines in this article

Built for exactly this

Glass Disc — Optical Inspection & Sorting Machine – Glass Disc

Glass Disc

Fasteners, O-rings, washers & turned parts inspected from every side on a rotating glass disc.

Source

Based on the company's own post:

Also read

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Jamnagar supplies brass inserts, terminals and turned parts across India. Why 100% inspection is replacing sampling there, and what a Glass Disc checks.

Sample bolts, screws and studs inspected on the Glass Disc bolt configuration

Why do fasteners pass one shift and fail the next?

Same fasteners, same machines, same drawing — a lot approved in one shift and rejected in the next. The parts did not change; the inspection did.

Glass Disc optical inspection and sorting machine — photograph of the machine with its feeder bowl

Speed, accuracy, data: what an optical sorting machine changes on the line

How an optical sorting machine works step by step, which parts it sorts, and what changes on a line once every part is inspected instead of a sample.

Is this your part?

Courier 50–100 sample parts to our Bhosari lab for a free feasibility study, or describe the part to VisiExpert. A vision engineer confirms the checks and the machine. +91 86699 62225 on WhatsApp works too.

Glass Disc page