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Description
ThreadM75 × 1.5
Tolerance class7h
TypeGO
Hardness58–62 HRC
Technical specifications of the M75 × 1.5 thread ring gauge
Gauge specifications according to ISO 965-1
| Technical data | |
|---|---|
| Gauge type | GO thread ring gauge LH |
| Thread | M75 × 1.5 mm |
| Nominal diameter | Ø75.000 mm |
| Pitch diameter (d2) | 74.026 mm |
| Thread pitch | 1.5 mm |
| Tolerance class | 7h |
| Material | Tool steel, hardened |
| Hardness | 58–62 HRC |
| Standard | ISO 965-1 / DIN 13 |
| Manufacturer | Varel |
Operating principle of the GO gauge
Gauge for M75x1.5 external threads
GO ring gauge GO M75x1.5 7h checks whether the external thread is oversized — it must screw on by hand along the full length. This is a single-limit check: it detects excess material but will not detect an undersized thread. That requires the ring gauge NO-GO, ordered separately: it may screw onto the thread no more than 2 threads, counted when unscrewing.
Studs and bolts of this size are used in flange and foundation joints. A nut that is hard to turn usually indicates an out-of-tolerance thread, not contamination. For reference: the thread minor diameter M75x1.5 is 73.160 mm — this cross section determines the bolt's strength, while the gauge checks the pitch diameter.
The GO gauge checks the maximum material limit of the external thread, checking pitch diameter, pitch and thread profile simultaneously. If the GO gauge does not screw onto the thread — the part is nonconforming (thread oversized, out of tolerance). Complete thread inspection also requires a gauge NO-GO, which checks the minimum material limit.
Tolerance classes for an M75 × 1.5 external thread
Comparison of classes according to ISO 965-1
Comparison of classes 6h, 7h, 7g and 8h
Basic pitch diameter d2 for the thread M75x1.5 is 74.026 mm. The deviations in the table are measured downward from this value.
| Class | d2 nominal [mm] | d2 permissible [mm] | Tolerance zone | Application | Status |
|---|---|---|---|---|---|
| 6h | 74.026 mm | 73.866 – 74.026 mm | 0.160 mm | Precision fit | |
| 7h | 74.026 mm | 73.826 – 74.026 mm | 0.200 mm | Standard fit (gauges) | THIS PRODUCT |
| 7g | 74.026 mm | 73.794 – 73.994 mm | 0.200 mm | Fit with allowance | |
| 8h | 74.026 mm | 73.776 – 74.026 mm | 0.250 mm | Coarse fit |
The full range of class 7h for the thread M75x1.5 is 0.200 mm: from 73.826 to 74.026 mm. Class 7h is the standard for general-purpose bolts — it mates with 6H nuts. Classes 4g and 5g reduce clearance in guiding joints, while 6e and 8g leave room for electroplating. The values in the table are pitch diameter d2, measured at half the profile height, not the thread major diameter.
Thread inspection process
Correct use of GO/NO-GO gauges
Thread inspection M75x1.5 7h
1 GO gauge
screws on: YES
2 NO-GO gauge
screws on: NO — max. 2 turns
✓ Conforming thread
class: 7h OK
Both conditions must be met simultaneously. Standard: ISO 965-1
Usage guidelines
Proper storage and use
Store the gauge in a dry place, protected with rust-preventive oil. Before measurement, remove chips and burrs from the thread being inspected. Screw the gauge on by hand — never use wrenches or force. The calibration interval is determined by the user based on usage intensity — ISO 1502 (clause 7.2.1) requires periodic gauge measurement but specifies neither the interval nor the number of measurements.
Varel gauge features:
| ✓ | Alloy tool steel hardened to 58–62 HRC |
| ✓ | Ground thread profiles for high accuracy |
| ✓ | Thread, tolerance class and type (GO) marked on the ring |
| ✓ | Compliance with ISO 965-1 / DIN 13 |
Frequently asked questions
The GO thread ring gauge is used to inspect M75x1.5 external threads of tolerance class 7h. It verifies that the pitch diameter, pitch and thread profile are within permissible limits. The gauge should screw freely onto the full length of the thread being inspected.
The GO gauge checks the maximum material limit — it must screw onto the thread. The NO-GO gauge checks the minimum limit — it should not screw on more than 2 turns. Both gauges are required for complete inspection of an M75x1.5 7h thread.
ISO 1502 (clause 7.2.1) requires gauge wear to be checked by periodic measurement at intervals based on usage intensity, but specifies neither the interval nor the number of measurements — these are determined by the user as part of measuring equipment control. Calibration is performed by an accredited metrology laboratory. Between calibrations, it is advisable to check the gauge using a setting plug gauge.
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| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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