See How The SquareMaster® Can Increase Your
Inspection Accuracy While Lowering Inspection Cost.
The squareness, straightness or parallelism of what you manufacture is too
important to be left up to guesswork. Conventional hand gages can't approach the
repeatable accuracy and long life of the SquareMaster by PMC Lonestar.
The SquareMaster can measure with an accuracy of ± 0.000050 of an inch (50
millionths) over any 12" of specified range. No hand gage even comes close.
It's our solid laboratory-grade granite master column that makes it possible.
In fact, the SquareMaster is the only vertical squareness gage that uses a
granite column. Besides unmatched accuracy, the SquareMaster's column requires
only an occasional wipe-down with alcohol to keep it accurate for many years to
come. That's why the SquareMaster is truly an investment sure to pay off in
increased accuracy far into the future.
The SquareMaster can be used for virtually any measurement of straightness,
squareness or parallelism on interior or exterior surfaces. Its precision direct
dial readout substitutes reliable and repeatable results for the subjective
calculations you probably now make.
The SquareMaster's lightweight design makes it completely portable for use on
machine tables, surface plates, at production set-ups and many other locations.
Use it for in-process work or in the Inspection Department for 100% inspection.
Wherever you use it, SquareMaster will deliver unarguable results time after
The SquareMaster is available in two models with vertical travel up to
Made of laboratory-grade precision granite, straight and parallel within ±
0.000025 (25 millionths) of an inch per foot, treated with special lifetime dry
To ± 0.000050" (50 millionths) over any specified 12" travel.
VSQ-12 - 0" to 12" standard, 18" with extension bracket
VSQ-18 - 0" to 18" standard, 24" with extension bracket
Dimensions and Weight
VSQ-12 - 22" high, 8" square base, 28 lbs.
VSQ-18 - 30" high, 9" square base, 40 lbs.
Two steps -
7/32" diameter (.219" + .000")
3/8" diameter (.375" + .000")
Your SquareMaster is shipped with an extension bracket as standard. It allows a
second dial indicator (optional) to be used for increasing the continuous
measurement range. The bracket can be rotated to check adjacent surfaces and
Frequent calibration of the SquareMaster will keep it operating accurately for
many years. By using the Master Square of laboratory-grade, lapped black
granite, your measurements can be relied on without question.
The ContouReader by PMC Lonestar is part of a new generation of precision
instruments to inspect both internal and external dimensions of literally
thousands of parts to guarantee the quality of your products. We offer two
versions of the ContouReader; a standard and new Windows-based computerized
version. The ContouReader inspects everything from dimples on golf balls to
turbine blades with the same repeatable accuracy to reveal any defects,
deviation from specifications, or rough edges that can adversely affect product
The operation of the ContouReader is simple. A part is placed in a fixture,
and the tracing stylus moves gently over the surface of the part, transferring
the stylus arm movements into electrical voltages which are amplified and
transmitted to the chart recorder or computer display. The recorder moves a pen
to draw an exact duplicate of the part contour on chart paper up to 200 times
its original size, and with accuracy of ±0.0002 inches on the standardized
version. The computerized version will display an exact duplication of the part
contour to an infinite magnification. A manual or electronic master overlay is
used over the ContouReader tracing to compare for accuracy.
What will you be able to see? Crest forms, root radii, flank angles, pitch
diameters, and others, all in seconds on a permanent record strip chart or
electronically. The electronic version can be shared via DXF or DWG format.
|Stylus Point Radius
|Minimum Hole Size for I.D.
|Vertical Positioning Range
|Stylus Horizontal Travel
|Maximum Vertical Stylus
|Maximum Head Tilt
|Minimum Included Angle
Using Standard Styli
Horizontal & Vertical Axis
(with special stylus)
for larger view
for larger view
for larger view
for current pricing and
PMC Lonestar is licensed by API to
Spec Q1, Spec 5B, 7 & 11B and manufactures a complete line of API (American
Petroleum Institute) plug and ring gages for
- Casing - sizes 4 ½" - 20", both working & masters
- Line Pipe - sizes 1/8" - 20D, both working & masters
- Tubing - EUT 2 3/8" - 4 ½", both working & masters, NUT 2
3/8" - 4 ½", both working & masters
- Buttress Casing - sizes 4 ½" - 20", both working & masters
- Improved Buttress Tubing - sizes 2" - 5 ½", both working &
- Sucker Rod - masters P1-P8 & B1-B6, working gages P2-P8 & B2-B6
- Polished Sucker Rod
- Rotary Shouldered - NC10-NC77, both working & masters
- Regular Rotary - sizes 2 3/8" - 8 5/8", both working &
- Full Hole - sizes 3 ½" - 6 5/8", both working & masters
- Internal Flush - sizes 2 3/8" - 5 ½", both working &
- Extreme Line Gages - contact for current pricing
- Negative Flank Angle – we have recently introduced fixed and ground
negative flank angle gages to our product line.
Field proven for over half a century, our master and working gages meet and
exceed specifications established by the American Petroleum Institute and are
used as the benchmark for calibration by the National Institute of Standards and
Technology (NIST). PMC Lonestar designs and manufactures special oil country
gages to your specifications.