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Description
ThreadM14 x2
Tolerance class6g
SetGO + NO-GO
StandardISO 1502
Technical specifications for the M14 x2 thread ring gauge
Gauge set specifications according to ISO 1502
| Technical data | |
|---|---|
| Gauge type | GO + NO-GO thread ring gauge set |
| Thread | M14 x2 mm (coarse pitch) |
| Tolerance class | 6g |
| Nominal diameter (d) | Ø14.000 mm |
| Pitch diameter (d2) | 12.701 mm |
| d2 range for 6g | 12.503 – 12.663 mm |
| Thread pitch (P) | 2.0 mm |
| Thread angle | 60° |
| Material | Tool steel, hardened |
| Hardness | 58–62 HRC |
| Gauge standard | ISO 1502 / DIN 2285 + DIN 2299 |
| Thread standard | ISO 965-1 / DIN 13-1 |
| Reference temperature | 20 °C |
| Manufacturer | Varel |
T
GO ring gauge — screwed on by hand along the full bolt thread.
Z
NO-GO ring gauge with a groove in the knurled surface — stops after no more than 2 turns.
The M14-6g engraving on the face of both rings indicates the size and tolerance class of the bolt being inspected.
Limit gauging principle: GO + NO-GO
Gauge for M14 external threads according to ISO 1502
1
The GO ring gauge is screwed on by hand, without force, along the full thread of the M14 x2 bolt.
2
The NO-GO ring gauge stops after no more than 2 turns — turns are counted when unscrewing.
3
The GO ring gauge passed, NO-GO stopped — the bolt meets class 6g.
The pair of ring gauges M14 x2 6g answers one question: whether this screw is within tolerance. The GO ring must screw on by hand over the entire thread; the NO-GO ring must stop after no more than 2 turns, counted when unscrewing it. The two results give a clear decision — acceptable or requiring rework.
The coarse pitch of 2 mm is the basic M14 thread version, used in structural bolts and machine housings. Ring gauging is faster than micrometer measurement using the three-wire method and requires no correction calculations. The deeper coarse thread profile provides a wider tolerance zone than the fine thread — 0.160 mm instead of 0.140 mm for M14 x1.5. The gauge fits only the thread M14 x2; M14 x1.5 and M14 x1 require separate rings. For reference: the thread minor diameter M14 is 11.546 mm — this cross section determines the screw's strength, while the gauge checks the pitch diameter. The standard group N engagement length for this thread is 8–24 mm.
GO gauge (GO) has a full thread profile and checks maximum material condition — pitch diameter, pitch and thread profile at the upper tolerance limit (for M14 6g: d2 max = 12.663 mm). It should screw freely onto the thread being inspected over its full length — without force or wrenches. NO-GO gauge (NO-GO) has a truncated profile with incomplete flanks and checks minimum material condition (d2 min = 12.503 mm). Per ISO 1502 §7, it must not screw onto the thread by more than 2 turns. Only meeting both conditions simultaneously confirms that the thread is within class 6g tolerance.
Thread inspection M14 x2 — class 6g
1 GO gauge
screws on the full length: YES
2 NO-GO gauge
advances max. 2 turns: YES
✓ Conforming thread
class 6g confirmed
Inspection standard: ISO 1502 · Tolerances: ISO 965-1 · Dimensions: ISO 724 / DIN 13-1
✓ Thread acceptable — GO screws onto the full thread, NO-GO stops.
✗ Thread oversized — GO does not screw onto the bolt.
✗ Thread undersized — NO-GO screws on more than 2 turns.
Tolerance classes for the M14 x2 external thread
Comparison per ISO 965-1 for M14 x2
Comparison of classes 4g, 6g, 6e and 8g
Basic pitch diameter d2 for the thread M14 x2 is 12.701 mm. The deviations in the table are measured downward from this value.
| Class | d2 nominal [mm] | d2 permissible [mm] | Tolerance zone | Application | Status |
|---|---|---|---|---|---|
| 4g | 12.701 mm | 12.563 – 12.663 mm | 0.100 mm | Precision fit | |
| 6g | 12.701 mm | 12.503 – 12.663 mm | 0.160 mm | Standard fit — bolts, fasteners | THIS PRODUCT |
| 6e | 12.701 mm | 12.470 – 12.630 mm | 0.160 mm | Clearance fit — for electroplating | |
| 8g | 12.701 mm | 12.413 – 12.663 mm | 0.250 mm | Coarse fit — hot-rolled threads |
The full tolerance range of class 6g for the thread M14 x2 is 0.160 mm: from 12.503 to 12.663 mm. Class 6g is standard for general-purpose screws and mates with 6H nuts. Classes 4g and 5g reduce clearance in guiding connections, while 6e and 8g leave room for electroplating. The values in the table represent the pitch diameter d2, measured at half the profile height, rather than the major thread diameter, which for class 6g ranges from 13.682 to 13.962 mm.
Proper use and calibration
Maintaining gauge accuracy
Usage rules according to ISO 1502
Before inspection, remove chips, burrs, oil, and contaminants from the thread. Screw the gauge on by hand only, without wrenches or externally applied torque (which increases wear and distorts the result). Reference inspection temperature: 20 °C. Store gauges in a dry place, protected with rust-preventive oil. The user sets the calibration interval based on usage intensity — ISO 1502 (section 7.2.1) requires periodic measurement of the gauge but specifies neither an interval nor a number of measurements. ISO 1502 specifies wear limits for thread ring gauges (wear limits); once these are exceeded, the gauge must be removed from service.
Varel set contents
Included in the set:
| ✓ | 1 × GO thread ring gauge — GO, full thread profile, checks the maximum material limit |
| ✓ | 1 × NO-GO thread ring gauge — NO-GO, truncated profile (max. 2 turns of engagement according to ISO 1502) |
| ✓ | Tool steel hardened to 58–62 HRC — high wear resistance |
| ✓ | Ground thread profiles — high measurement repeatability |
| ✓ | Compliance with ISO 1502 / DIN 2285 + DIN 2299 (gauges) and ISO 965-1 / DIN 13-1 (thread) |
Frequently asked questions
Limit gauging requires verification of both maximum and minimum material limits. The GO gauge confirms that the thread is not oversized (it screws on over the full length), while the NO-GO gauge confirms that it is not undersized (it does not engage more than 2 turns per ISO 1502). Using only one gauge leaves the other limit unchecked — the part may be outside the 6g tolerance despite passing a partial inspection.
The GO gauge has a full thread profile and represents the maximum material limit of the external thread being inspected (for M14 6g: d2 max = 12.663 mm). The NO-GO gauge has a shortened profile (truncated) with incomplete flanks — it checks only the pitch diameter at its lower limit (d2 min = 12.503 mm) and has a shorter threaded length (typically 3 full turns). The design of both types is defined in ISO 1502, Table 2.
No. A gauge represents one specific pitch and one set of limit dimensions. The M14 x1.5 fine thread has a different pitch diameter — 13.026 mm instead of 12.701 mm — and a different profile, so the M14 x2 ring gauge will not screw onto it. Each pitch variant (2 mm, 1.5 mm, 1.25 mm, 1 mm) requires a separate GO + NO-GO set.
The thread is nonconforming if either condition occurs: the GO gauge does not screw on over the full length (thread oversized — d2 above 12.663 mm) or the NO-GO gauge advances more than 2 turns (thread undersized — d2 below 12.503 mm). In either case, the part must be rejected or corrected. Reference standard: ISO 965-1 (tolerances), ISO 1502 (inspection procedure).
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