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Thread ring gauge M16x1.5 6g GO NO-GO
15302
€32.37 tax inc.
Net price: €26.32
Description
ThreadM16x1.5
Tolerance class6g
SetGO + NO-GO
StandardISO 1502
Technical specifications of the M16x1.5 thread ring gauge
Gauge set specifications according to ISO 1502
| Technical data | |
|---|---|
| Gauge type | GO + NO-GO thread ring gauge set |
| Thread | M16x1.5 mm (fine thread) |
| Tolerance class | 6g |
| Nominal diameter (d) | Ø16.000 mm |
| Pitch diameter (d2) | 15.026 mm |
| d2 range for 6g | 14.854 – 14.994 mm |
| Thread pitch (P) | 1.5 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 13-2 |
| 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 M16x1.5-6g 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 M16x1.5 external threads according to ISO 1502
1
The GO ring screws by hand, without force, over the full thread of the M16x1.5 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 ring gauge set M16x1.5 6g checks an external thread — on a bolt, stud or turned pin. The ring gauge GO must screw on by hand along the full thread length, while the ring gauge NO-GO may advance no more than 2 threads, counted when unscrewing. Only both results together confirm that the thread is neither oversized nor undersized.
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 1.5 mm gives a shallower profile and less clearance than the coarse pitch of 2 mm. The gauge fits only the thread M16x1.5 — M16 with a 2 mm pitch requires a separate gauge. For reference: the thread minor diameter M16x1.5 is 14.160 mm — this cross section determines the bolt's strength, while the gauge checks the pitch diameter.
The gauge GO has a full thread profile and checks the maximum material limit — the pitch diameter, pitch, and thread profile at the upper tolerance limit (for M16x1.5 6g: d2 max = 14.994 mm). It should screw freely onto the full length of the thread being inspected — without force or wrenches. The gauge NO-GO has a truncated profile with incomplete flanks and checks the minimum material limit (d2 min = 14.854 mm). According to ISO 1502 §7 it must not screw onto the thread more than 2 threads. Only meeting both conditions simultaneously confirms that the thread is within tolerance class 6g.
Thread inspection M16x1.5 — 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 13-2
✓ 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 M16x1.5 external thread
Comparison according to ISO 965-1 for M16x1.5
Comparison of classes 4g, 6g, 6e and 8g
Basic pitch diameter d2 for the thread M16x1.5 is 15.026 mm. The deviations in the table are measured downward from this value.
| Class | d2 nominal [mm] | d2 permissible [mm] | Tolerance zone | Application | Status |
|---|---|---|---|---|---|
| 4g | 15.026 mm | 14.904 – 14.994 mm | 0.090 mm | Precision fit | |
| 6g | 15.026 mm | 14.854 – 14.994 mm | 0.140 mm | Standard fit — bolts, fasteners | THIS PRODUCT |
| 6e | 15.026 mm | 14.819 – 14.959 mm | 0.140 mm | Clearance fit — for electroplating | |
| 8g | 15.026 mm | 14.770 – 14.994 mm | 0.224 mm | Coarse fit — hot-rolled threads |
The full range of class 6g for the thread M16x1.5 is 0.140 mm: from 14.854 to 14.994 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.
Proper use and calibration
Maintaining gauge accuracy
Usage rules according to ISO 1502
Before measurement, the thread is cleaned of chips, burrs, oil and contaminants. The gauge is screwed on by hand only, without wrenches or externally applied torque (which increases wear and distorts the result). Reference inspection temperature: 20 °C. Gauges are stored in a dry place, protected with rust-preventive oil. 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. ISO 1502 specifies thread ring gauge wear limits (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 13-2 (fine thread) |
Frequently asked questions
Standard M16 (coarse) has a pitch of 2.0 mm, whereas M16x1.5 is a thread fine thread (fine pitch) with a pitch of 1.5 mm. A smaller pitch means more threads over the same length, providing greater joint strength, less susceptibility to self-loosening, and finer axial adjustment. The pitch diameter of M16x1.5 (d2 = 15.026 mm) is larger than that of standard M16 (14.701 mm) — the gauges are not interchangeable.
The principle of limit gauging requires verification of both the maximum and minimum material limits. The GO gauge confirms that the thread is not oversized (it screws on over the full length), and the NO-GO gauge confirms that it is not undersized (it does not engage more than 2 turns according to ISO 1502). Using only one gauge leaves the other limit unchecked.
The thread is nonconforming, if: the GO gauge does not screw on over the full length (thread oversized — d2 above 14.994 mm) or the NO-GO gauge advances more than 2 turns (thread undersized — d2 below 14.854 mm). In either case, the part must be rejected or reworked. Reference standard: ISO 965-1 (tolerances), ISO 1502 (inspection procedure).
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