Measuring instruments & thread gauges

Asimeto Measuring Tools Gauge It. Measure It.

Over 650 Asimeto lines in UK stock: GO / NO GO thread plug and ring gauges in Metric, BSP, UN and NPT, H7 plain hole gauges, and digital calipers, micrometers, height gauges and dial test indicators for the machine and the inspection bench.

Shop the range Find a thread gauge
230Thread plug gauges
352Thread ring gauges
54Instruments
5Thread forms
Free next day delivery over £50 ex VATSame day dispatch by 4.30pmExpert technical advice on 01732 887334UKAS calibration available

The Asimeto range

Shop Asimeto by Job

Pass or fail at the machine with a gauge, or take a reading with an instrument. Start with what you need to check.

Gauges: pass or fail
Asimeto Plug Thread Gauge (D/E) - Metric - Right Hand - 6H - M4 x 0.7230

Thread Plug Gauges

Internal threads, GO / NO GO

Double-ended plug gauges for tapped holes. Metric coarse and fine 6H, BSP (G), UNC, UNF and UNEF 2B, and NPT.

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Asimeto Ring Thread Gauge (Go) - Metric - Right Hand - 6g - M14 x 1352

Thread Ring Gauges

External threads, GO and NO GO

Separate GO and NO GO rings for bolts, studs and spigots. Metric coarse and fine 6g, BSP (G) and NPT.

Shop ring gauges
Asimeto Plug Hole Gauge H7 - 670 Series - 4mm30

Plain Hole Gauges H7

Plug and ring, 670 and 675 series

Check a bored or reamed hole, or a turned diameter, against H7 without reading a scale.

Shop H7 gauges
Asimeto Plug Gauge Kit - M3, M4, M5, M6, M8, M10, M123

Thread Gauge Kits

M3 to M12 sets

Plug gauge, GO ring and NO GO ring kits covering M3, M4, M5, M6, M8, M10 and M12.

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Instruments: take a reading
Asimeto Digital Vernier - IP67 - 305 Series - 0-200mm15

Calipers

Digital and vernier, 150 to 300 mm

The 307 and absolute 307, big-screen 306, IP67 coolant-proof 305 and 341 manual vernier series.

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Asimeto Digital Outside Micrometers - IP65 - 105 Series - 25-50mm (Metric/Imperial Conversion)16

Outside Micrometers

0-25 to 125-150 mm

IP65 105 series and economic 116 series digital, with metric/imperial conversion, and the 101 manual series.

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Asimeto Absolute Depth Caliper With Hook - 323 Series - 0-150mm5

Depth Calipers

327 and 323 series

Depth calipers to 300 mm, including the absolute depth caliper with hook for grooves and steps.

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Asimeto Height Gauge - Double Beam Digital Counter 627 Series - 0-300mm3

Height Gauges

Double beam, digital counter

The 627 series double-beam height gauge in 300, 450 and 600 mm for the surface plate.

Shop height gauges
Asimeto Articulating Arm Magnetic Bases 602 Series - 60x50x55mm -350mm Height15

Indicators & Magnetic Bases

DTI sets, 601 and 602 bases

Horizontal dial test indicator full sets with 32 and 40 mm dials, and magnetic and articulating arm bases.

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Find a thread gauge

Asimeto Gauges by Thread Form

Pick the thread on the drawing, then plug for a tapped hole or ring for an external thread. All right hand.

Thread formClassPlug gauges (internal)Ring gauges (external)
Metric coarse6H / 6gPlug D/EGONO GO
Metric fine6H / 6gPlug D/EGONO GO
BSP (G)6H / Tol. APlug D/EGONO GO
UNC, UNF, UNEF2BPlug D/E–
NPTASME B1.20.1Plug GO/NO GORing GO/NO GO
Plain H7H7PlugRing

Thread gauging

How to Check a Thread with a GO / NO GO Gauge

A gauge gives a pass or a fail, fast, at the machine, with nothing to read or interpret.

  1. 1

    Check the Class

    Match the gauge to the drawing: 6H for an internal metric thread, 6g for external, 2B for internal UN.

  2. 2

    Clean Both

    Clean the thread and the gauge. Swarf or coolant in the thread gives a false result.

  3. 3

    GO End

    The GO end should screw in by hand for the full thread length without force.

  4. 4

    NO GO End

    The NO GO end should not enter more than two turns. If it goes further, the thread is oversize.

Shop plug gauges Shop ring gauges

Questions

Asimeto: Common Questions

What is the difference between a thread plug gauge and a ring gauge?

A plug gauge checks an internal thread, such as a tapped hole. A ring gauge checks an external thread, such as a bolt or stud. Asimeto metric, BSP and UN plug gauges are double-ended, with GO and NO GO on one handle; metric and BSP ring gauges are sold as separate GO and NO GO rings.

What do 6H, 6g and 2B mean?

They are tolerance classes. 6H is the standard class for an internal metric thread and 6g for an external one. 2B is the standard class for an internal UN thread. Choose the gauge in the class shown on your drawing, or the result will not match the specification.

Do I need both a GO and a NO GO ring gauge?

Yes, to fully check an external thread. The GO ring proves the thread is not too large and the form is complete; the NO GO ring proves it is not too small. With only one you check one limit.

Can I get a calibration certificate with an Asimeto gauge?

Yes. UKAS calibration certificates can be added to gauges and instruments; see our UKAS calibration certificates or call 01732 887334.

Which Asimeto caliper should I choose?

The 305 series is IP67 rated for use with coolant. The 306 series has a big screen for easier reading. The 307 series is the standard digital caliper, with an absolute version that keeps its zero when switched off. The 341 series is a manual vernier that needs no battery.

Not Sure Which Gauge or Instrument You Need?

Send us the thread callout or tolerance from your drawing and we will pick the right Asimeto tool. Everything here ships from Kent.

Call 01732 887334 Email sales@protool-ltd.co.uk