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.
Reviewed by Mahemood Ahmad, Lab Manager — NABL Accredited Laboratory, Global Lab India
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.