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Description
ThreadM14 × 0.75
Tolerance class6g
TypeGO
Hardness58–62 HRC
Technical specifications of the M14 × 0.75 thread ring gauge
Gauge specifications according to ISO 965-1
| Technical data | |
|---|---|
| Gauge type | GO thread ring gauge |
| Thread | M14 × 0.75 mm |
| Nominal diameter | Ø14.000 mm |
| Pitch diameter (d2) | 13.513 mm |
| Thread pitch | 0.75 mm |
| Tolerance class | 6g |
| Material | Tool steel, hardened |
| Hardness | 58–62 HRC |
| Standard | ISO 965-1 / DIN 13 |
| Manufacturer | Varel |
Operating principle of the GO gauge
Gauge for M14x0.75 external threads
GO ring gauge GO M14x0.75 6g 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.
Bolts of this size secure steel structures, flanges and machine housings — joints subjected to loads and vibration. A nut screwed onto an out-of-tolerance thread appears to hold but loses clamping force after several cycles. The fine pitch of 0.75 mm gives a shallower profile and less clearance than the coarse pitch of 2 mm. The gauge fits only the thread M14x0.75 — M14 with a 2 mm pitch requires a separate gauge. For reference: the thread minor diameter M14x0.75 is 13.080 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 M14 × 0.75 external thread
Comparison of classes according to ISO 965-1
Comparison of classes 4g, 6g, 6e and 8g
Basic pitch diameter d2 for the thread M14x0.75 is 13.513 mm. The deviations in the table are measured downward from this value.
| Class | d2 nominal [mm] | d2 permissible [mm] | Tolerance zone | Application | Status |
|---|---|---|---|---|---|
| 4g | 13.513 mm | 13.424 – 13.491 mm | 0.067 mm | Precision fit | |
| 6g | 13.513 mm | 13.385 – 13.491 mm | 0.106 mm | Standard fit (bolts) | THIS PRODUCT |
| 6e | 13.513 mm | 13.351 – 13.457 mm | 0.106 mm | Clearance fit (coatings) | |
| 8g | 13.513 mm | 13.321 – 13.491 mm | 0.170 mm | Coarse fit |
The full range of class 6g for the thread M14x0.75 is 0.106 mm: from 13.385 to 13.491 mm. Class 6g 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 M14x0.75 6g
1 GO gauge
screws on: YES
2 NO-GO gauge
screws on: NO — max. 2 turns
✓ Conforming thread
class: 6g 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 M14x0.75 external threads of tolerance class 6g. 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 M14x0.75 6g 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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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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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