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M4.5 6g Go ring gauge
0000004369
€9.71 tax inc.
Net price: €7.89
Description
ThreadM4.5 × 0.75
Tolerance class6g
TypeGO
Hardness58–62 HRC
Technical specifications of the M4.5 × 0.75 thread ring gauge
Gauge specifications according to ISO 965-1
| Technical data | |
|---|---|
| Gauge type | GO thread ring gauge |
| Thread | M4.5 × 0.75 mm |
| Nominal diameter | Ø4.500 mm |
| Pitch diameter (d2) | 4.013 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 M4.5 external threads
The ring gauge GO M4.5 6g determines whether the external thread is oversized: it must screw on by hand along the full length. If it stops sooner — the thread is out of tolerance. This ring gauge does not check the minimum limit — that requires NO-GO, ordered separately, which may screw on no more than 2 threads, counted when unscrewing.
Bolts in this size range secure housings, brackets and machine subassemblies. The ring gauge detects a thread deformed during machining or damaged in transit before the batch reaches assembly. The 0.75 mm pitch is the coarse pitch for this diameter: the designation M4.5 without a specified pitch denotes this thread. For reference: the thread minor diameter M4.5 is 3.580 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 M4.5 × 0.75 external thread
Comparison of classes according to ISO 965-1
Comparison of classes 4g, 6g, and 6e
Basic pitch diameter d2 for the thread M4.5 is 4.013 mm. The deviations in the table are measured downward from this value.
| Class | d2 nominal [mm] | d2 permissible [mm] | Tolerance zone | Application | Status |
|---|---|---|---|---|---|
| 4g | 4.013 mm | 3.935 – 3.991 mm | 0.056 mm | Precision fit | |
| 6g | 4.013 mm | 3.901 – 3.991 mm | 0.090 mm | Standard fit (bolts) | THIS PRODUCT |
| 6e | 4.013 mm | 3.867 – 3.957 mm | 0.090 mm | Clearance fit (coatings) |
The full range of class 6g for the thread M4.5 is 0.090 mm — less than the thickness of a sheet of paper: from 3.901 to 3.991 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 M4.5 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 M4.5 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 M4.5 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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| 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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