NABL Accredited · Dimensional Calibration
Thread Gauge Calibration
(IS 4218 / IS 1716 — Go/No-Go Thread Gauge)
NABL-accredited calibration of Go and No-Go thread gauges per IS 4218 — verifying major, minor and pitch diameters for structural fastener and anchor bolt quality control.
IS 4218
Standard
±2μm
Accuracy
2 Days
Report TAT
NABL
Accredited
NABL Accredited Lab · ISO/IEC 17025:2017
Digital Reports via Autovity QLMS
Pan-India · 7 Lab Locations
Est. 2009 · 20,000+ Projects
Overview
What is the Thread Gauge Calibration?
Thread Gauges (Go/No-Go plug and ring gauges) verify threaded fasteners, anchor bolts, threaded rods and studded bars conform to IS 1367 and IS 4218. Used in construction to verify anchor bolt and holding-down bolt thread quality before structural installation.
At Global Lab, thread gauge calibration per IS 4218 uses three-wire method or CMM measurement to verify major, minor and effective pitch diameters against IS 4218 tolerance class requirements. Certificate issued with all three diameters.
Non-Destructive
Minimal surface preparation. Structure integrity is preserved throughout testing.
Fast Turnaround
On-site results within hours. Digital reports dispatched within 24 hours.
NABL Certified
All test and calibration results are backed by traceable measurements and standardized procedures.
Pan-India Coverage
Site engineers deployed across 7 lab locations and all major project sites.
Digital Reporting
Access reports anytime via Autovity QLMS client dashboard — zero paperwork.
High Accuracy
Results correlated to cube compressive strength with ±2% precision range.
Test in Action
Thread Gauge Calibration — Site Images
Three-Wire Pitch Diameter Measurement on Thread Gauge
Go/No-Go Plug Gauge Major Diameter
IS 4218 Tolerance Class Compliance Certificate
Test Procedure
How the Thread Gauge Calibration is Conducted
-
1
Surface Preparation
A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris. -
2
Insert Disc Placement
A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface. -
3
Hydraulic Pullout Force Application
A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface. -
4
Failure Load Recording
The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging. -
5
Strength Calculation & Reporting
The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.
Standards & Specifications
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 4218 | ISO Metric Screw Threads — Specification | Thread Standard | Indian Standard |
| IS 1716 | Specification for Ring and Plug Gauges | Thread Gauge | Indian Standard |
| IS 1367 | Technical Supply Conditions for Threaded Fasteners | Fastener Standard | Indian Standard |
| NABL-141 | NABL Policy on Metrological Traceability | Traceability | NABL |
Applications
Where is the Thread Gauge Calibration Used?
Structural anchor bolt thread gauge calibration
Holding-down bolt thread gauge for fabrication QC
Foundation anchor bolt Go/No-Go gauge calibration
IS 1367 fastener class acceptance gauge calibration
Precast concrete insert thread gauge calibration
Thread gauge + Vernier + dial gauge for metal QC lab
Why Choose Global Lab
Our Advantages
NABL Accredited CertificatesIS 4218 / IS 1716 thread gauge certificates.
Three-Wire AccuracyMost precise thread measurement technique.
Go & No-Go BothComplete pass/fail gauge set certified.
Fast 2-Day CertificateCertificate within 2 working days.
Pan-India CoverageDimensional calibration at all 7 locations.
Fastener Testing IntegrationThread gauge + mechanical testing in same submission.