,

Eisen SPO Series Limit Screw Gauge

Made in Japan
Manufacturer: Eisen Co., Ltd.
Model: SPO Series

One-way thread gauge 2→1

About the Series

Improved work efficiency with 2→1 action measurement!

SPO Series

Conventional plug gauges measure GO and NO by two actions, but this allows measurement with one action, improving work efficiency. If the GO side thread plug gauge can be inserted smoothly and stops at the stopper end face, it is judged as pass.
The GO side is a guide, so erroneous judgment of the NO side can be prevented.

Features

  • Comes with a detachable hex handle.
  • The handle has a left-handed screw mechanism to prevent over-tightening.
  • You can also remove the hexagonal handle and use it by holding the stopper (made of stainless steel).
  • The material used is gauge steel (SK33, HRC58 or higher), which has excellent wear resistance.
  • To ensure our customers’ trust and peace of mind, an inspection report is included.

How to use

If the GO side thread plug gauge can be inserted smoothly into the threaded hole and stops at the stopper end face, it is judged as pass.

One-way thread gauge

Example of notation 

Thread Nominal pitch Threaded section L1 Stopper part L2 Stopper part φD Hexagonal handle part L3 Hexagonal handle part H Gauge Type Grade
M1.4 0.3 Regular 3 6.5 Four 30 Ten GPIP

GPWP

GPNP

6H

[5H]

M1.6 0.35 Regular 3.5 6
M1.7 0.35 Regular
M1.8 0.35 Regular
M2 0.4 Regular Four 7 7
M2.3 0.4 Regular
M2.5 0.45 Regular 4.5 6.5
M2.6 0.45 Regular
M3 0.5 Regular Five 6
M4 0.7 Regular 7 9 8 40
M5 0.8 Regular 8 8
M6 1.0 Regular Ten 9 Ten
M7 1.0 Regular
M8 1.25 Regular 12.5 Ten 12
M8 1.0 Details Ten 12.5
M10 1.5 Regular 15 11 14 12
M10 1.25 Details 12.5 13.5
M10 1.0 Details Ten 16
M12 1.75 Regular 17.5 11.5 16
M12 1.5 Details 15 14
M12 1.25 Details 12.5 16.5
M14 2.0 Regular 20 12 18 17
M14 1.5 Details 15 17
M16 2.0 Regular 20 12 20
M16 1.5 Details 15 17
M18 2.5 Regular twenty five 13 twenty two
M18 1.5 Details 15 twenty three
M20 2.5 Regular twenty five 13 twenty four
M20 1.5 Details 15 twenty three
  • *We can also manufacture special dimensions (fine, extra fine, unified, pre-plated settings, etc.).
  • (Fine, extra fine, unified, helical insert, pre-plating setting, etc.)
Custom One-Way Thread Gauge

Example of notation 


Thread Nominal pitch Thread gauge length K
(specified in 0.1 mm increments)
Threaded section
L1
Stopper part
L2
Stopper part
φD
Hexagonal
handle part
L3
Hexagonal
handle part
H
Gauge Type Grade
M1.4 0.3 Regular 1.2 – 5.0 K+ 3P 6.5 Four 30 Ten GPIP

GPWP

GPNP

6H
[5H]

M1.6 0.35 Regular 1.4 – 5.0 6
M1.7 0.35 Regular 1.4 – 5.0
M1.8 0.35 Regular 1.4 – 5.0
M2 0.4 Regular 1.6 – 7.0 7 7
M2.3 0.4 Regular 1.6 – 7.0
M2.5 0.45 Regular 1.8 – 9.0 6.5
M2.6 0.45 Regular 1.8 – 9.0
M3 0.5 Regular 2.0 – 9.0 6
M4 0.7 Regular 2.8–12.5 9 8 40
M5 0.8 Regular 3.2–12.5 8
M6 1.0 Regular 4.0 – 17.5 9 Ten
M7 1.0 Regular 4.0 – 17.5
M8 1.25 Regular 5.0 – 20.0 Ten 12
M8 1.0 Details 4.0 – 20.0 12.5
M10 1.5 Regular 6.0 – 25.0 11 14 12
M10 1.25 Details 5.0 – 25.0 13.5
M10 1.0 Details 4.0 – 25.0 16
M12 1.75 Regular 7.0 – 30.0 11.5 16
M12 1.5 Details 6.0 – 30.0 14
M12 1.25 Details 5.0 – 30.0 16.5
M14 2.0 Regular 8.0 – 32.0 12 18 17
M14 1.5 Details 6.0 – 32.0 17
M16 2.0 Regular 8.0 – 32.0 12 20
M16 1.5 Details 6.0 – 32.0 17
M18 2.5 Regular 10.0 to 36.0 13 twenty two
M18 1.5 Details 6.0 – 36.0 twenty three
M20 2.5 Regular 10.0 to 40.0 13 twenty four
M20 1.5 Details 6.0 – 40.0 twenty three
  • *We can also manufacture special dimensions (fine, extra fine, unified, pre-plated settings, etc.).
  • (Fine, extra fine, unified, helical insert, pre-plating setting, etc.)

Special Shaped Products

Simultaneous determination of screw hole concentricity

Thread and pilot hole measurement

Helical (planet) tap machining allowance measurement

\

Calibration Procedure

Although the gauge part on the NO GO side only has two pitches, it can be disassembled and calibrated in the same way as a standard thread gauge.
No special tools are required for disassembly.

1. Remove the stopper.
2. Measure the go-through side with a three-wire gauge.
3. Measure the stop-through side with a three-wire gauge.
4. Attach the stopper.

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