MSBG Metric Thread Plug Gauge GO/NOGO M8 6H

Precision-ground to 60-62 HRC and lapped to a mirror finish, this MSBG thread plug gauge delivers laboratory-grade verification of M8 x 1.25 internal threads with a 6H tolerance class.

Overview

Built for quality control and dimensional verification, this double-ended GO/NOGO gauge checks both acceptance and rejection limits in one tool. The GO end ensures the thread is within tolerance, while the NOGO end detects oversize conditions, preventing defective parts from passing inspection. Conforming to ISO 1502 and DIN 13, it is the definitive reference for metric thread conformity.

What stands out

• High-grade tool steel with 60-62 HRC hardness for long service life
• Double-ended design: GO and NOGO on one handle for fast, foolproof checks
• Precision ground and lapped surfaces ensure reliable, repeatable measurements
• Traceable to national standards; calibration certificate available on request
• Right-hand thread, standard coarse pitch (1.25 mm) for M8 internal threads

Technical details

• Gauge type: Thread plug gauge (GO/NOGO)
• Thread standard: ISO metric thread
• Nominal diameter: M8 (8 mm)
• Thread pitch: 1.25 mm (standard coarse)
• Tolerance class (workpiece): 6H (internal threads)
• Gauge material: High-grade tool steel
• Hardness: 60-62 HRC
• Surface finish: Precision ground and lapped
• Gauge design: Double-ended (GO and NOGO on one handle)
• Application: Inspection of internal threads (nuts, tapped holes)
• Compliance: ISO 1502 and DIN 13
• Accuracy class: High precision (manufactured to tighter tolerances than workpiece)
• Thread direction: Right-hand
• Manufacturer: MSBG
• Product function: Quality control and dimensional verification
• Calibration: Traceable to national standards (certificate often available)

Our verdict

For workshops that cannot afford a single out-of-tolerance thread, this MSBG gauge is the uncompromising standard. Its dual-ended convenience and certified accuracy make it an indispensable asset on any inspection bench.