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Shank gauge M3.5 6G
0000007433
€9.71 tax inc.
Net price: €7.89
Description
THREADM3.5x0.6
TOLERANCE6G
STANDARDISO 1502
MATERIALTool steel
Thread plug gauge M3.5 6G GO/NO-GO
Internal thread gauge according to PN-ISO 1502:1998
| TECHNICAL DATA | |
|---|---|
| Thread type | ISO metric (M) |
| Thread size | M3.5 |
| Thread pitch | 0.6 mm |
| Tolerance class | 6G |
| Gauge type | GO / NO-GO |
| Material | Tool steel, hardened |
| Hardness | 58-62 HRC |
| Standard | PN-ISO 1502:1998 |
| Manufacturer | Varel |
1
GO end — longer thread with a full profile. It is screwed in by hand through the full length of the hole.
2
Handle engraved with M3.5-6G — size and tolerance class of the hole being inspected.
3
Red ring — identifies the NO-GO end.
4
NO-GO end — shorter thread with a truncated profile. It checks only the pitch diameter, so it is allowed to enter by 2 turns.
Thread plug gauge M3.5 6G provides the fastest check of a threaded hole — without a micrometer or calculations. The end GO must enter by hand along the full thread length, while the end NO-GO must stop after no more than 2 turns, counted when unscrewing. GO enters, NO-GO does not — the hole meets class 6G.
Holes of this size recur in every batch of parts: holders, brackets, covers, and pump housings. Here, the gauge primarily checks the tool — it shows when the tap has stopped holding size. The 0.6 mm pitch is the coarse pitch for this diameter: the designation M3.5 without a specified pitch denotes this particular thread. For reference: the minor diameter of the thread M3.5 is 2.850 mm, while the gauge checks the pitch diameter, which is the dimension halfway up the thread profile.
Operating principle: GO / NO-GO
How to check an internal thread correctly
1
The GO end is screwed in by hand, without force, through the full length of the M3.5 x0.6 thread.
2
The NO-GO end stops after no more than 2 turns — turns are counted when unscrewing.
3
The GO end passed, the NO-GO end stopped — the hole is within class 6G.
Thread inspection in 3 steps
1 GO end (longer thread)
Screwing into the thread — must enter
2 NO-GO end (red)
Screwing into the thread — no more than 2 turns
✓ Acceptable thread
Tolerance: 6G OK
If the end GO enters, and the end NO-GO does not enter — the thread meets the requirements of class 6G according to PN-ISO 1502:1998
GO end (passes)
No color marking — it has a longer thread and GO marked on the handle. It checks minimum internal thread dimensions. It must screw in freely along the full thread length. If it does not enter — the thread is undersized (the workpiece requires rework).
NO-GO end
Marked with a red ring. Checks maximum thread dimensions. It must not screw in more than 2 threads, with turns counted when unscrewing the gauge, not when screwing it in. If it goes farther — the thread is too loose and the part does not meet the tolerance class. For a thread 3 turns long or shorter, the NO-GO end must not pass all the way through.
✓ Thread acceptable — GO enters the full length, NO-GO stops.
✗ Thread too tight — GO does not enter the hole.
✗ Thread too loose — NO-GO enters more than 2 turns.
Tolerance class 6G for the M3.5x0.6 thread
Comparison of tolerance classes for an M3.5x0.6 internal thread
Comparison of classes 4G, 5G, 6G, and 7G
Basic pitch diameter D2 for the thread M3.5 is 3.110 mm. In classes designated H, this is also the minimum dimension — the tolerance extends upward only.
| Class | D2 nominal [mm] | D2 permissible [mm] | Tolerance zone | Application | Status |
|---|---|---|---|---|---|
| 4G | 3.110 mm | 3.131 – 3.202 mm | 0.071 mm | Precision, coated | |
| 5G | 3.110 mm | 3.131 – 3.221 mm | 0.090 mm | Accurate, coated | |
| 6G | 3.110 mm | 3.131 – 3.243 mm | 0.112 mm | Standard, coated | THIS PRODUCT |
| 7G | 3.110 mm | 3.131 – 3.271 mm | 0.140 mm | Coarse, coated |
The full range of class 6G for the thread M3.5 is 0.112 mm: from 3.131 to 3.243 mm. Class 6G corresponds to a typical nut and a standard machine tap — it is selected for class 6g bolts. Classes 4H and 5H reduce clearance where the thread guides a component; 7H leaves an allowance for electroplating. The values in the table refer to pitch diameter D2, not the tap drill diameter.
Set contents and storage
Set contents and gauge storage
INCLUDED:
| ✓ | Thread plug gauge M3.5 6G GO/NO-GO |
| ✓ | Size marking on the plug |
STORAGE:
| ✓ | Store in a dry place, in its case |
| ✓ | Protect against dropping — impact damages the thread |
| ✓ | Apply rust-preventive oil periodically |
Frequently asked questions
6G is an internal thread tolerance class according to ISO 965-1 with position G (positive lower deviation). It is used when the thread requires a looser fit, for example after electroplating.
The end GO (GO, with the longer thread) must enter freely along the full thread length. The end NO-GO (NO-GO, red) should not screw in more than 2 turns (counted when unscrewing). Both conditions must be met simultaneously for the thread to be considered acceptable according to PN-ISO 1502:1998.
Gauge wear is checked by periodic measurement at intervals based on usage intensity (ISO 1502, clause 7.2.1); the standard specifies neither the number of measurements nor a fixed interval. A worn gauge gives false positive results — the NO-GO end starts entering the thread. The gauge should be verified periodically using setting gauges.
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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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