Special Thread Measuring Wires (+/- .000020") - Inches

Thread Check Inc. offers special sized thread measuring wires that meet or exceed ASME B89.1.17, ASME/ANSI B1.2 and B1.16M for Grade A Thread measuring wires. The 3 wire method is the most accurate and universally method of measuring the effective or pitch diameter of an external screw thread.

SKU Description TPI Each
STMW-.004-.005-TPI Special Thread Measuring Wires (+/- .000020") - .004"-.005" TPI .004"-.005"
$192.00
STMW-.005-.007-TPI Special Thread Measuring Wires (+/- .000020") - .005"-.007" TPI .005"-.007"
$174.00
STMW-.007-.010-TPI Special Thread Measuring Wires (+/- .000020") - .007"-.010" TPI .007"-.010"
$174.00
STMW-.010-.135-TPI Special Thread Measuring Wires (+/- .000020") - .010"-.135" TPI .010"-.135"
$174.00
STMW-.135-.260-TPI Special Thread Measuring Wires (+/- .000020") - .135"-.260" TPI .135"-.260"
$174.00
STMW-.260-.385-TPI Special Thread Measuring Wires (+/- .000020") - .260"-.385" TPI .260"-.385"
$174.00
STMW-.385-.510-TPI Special Thread Measuring Wires (+/- .000020") - .385"-.510" TPI .385"-.510"
$174.00
STMW-.510-.635-TPI Special Thread Measuring Wires (+/- .000020") - .510"-.635" TPI .510"-.635"
$174.00
STMW-.635-.760-TPI Special Thread Measuring Wires (+/- .000020") - .635"-.760" TPI .635"-.760"
$192.00
STMW-.760-1.010-TPI Special Thread Measuring Wires (+/- .000020") - .760"-1.010" TPI .760"-1.010"
$192.00
Set Descending Direction
per page

Additional Info

Certified Thread Measuring Wires

P.D. = Pitch Diameter
M = Measurement over wires
W = Wire diameter
C = Constant
C = .86603 x Pitch (inches) -3W
P.D. = M-C
W = .57735 x

Thread Measuring Wires

Tolerance and specifications:

  • within .000020" of best wire diameter for specified tpi.
  • within .000005" of the calibrated size provided on label.
  • have the same diameter within .000005".
  • roundness within .000010".
  • taper does not exceed .000010".
  • standard 2" lengths.
  • minimum hardness of RC 62.5.
  • surface finish lapped, 1 MU AA.
  • traceable to NIST.
  • wires meet or exceed Federal specifications ASME/ANSI B1.2 and B1.6M for Grade A Master Thread Wires

Use of best size wires

In measuring screw threads it is desirable to use wires which touch the thread at or near the pitch diameter for the reason that with such "Best Size" wires the measurement of pitch diameter is least effected by an error in the included angle of thread.

Certified Thread Measuring Wires

Notes: Maximum and minimum wires should be used which are safely within the limiting dimensions given by the above formulas.

Call for information and pricing of special wire diameters including Whitworth, British Association, Buttress and worm threads.

Root Diameter Wires:
60° and 55° threads from 41/2-64 TPI.
Price per set of 3 wires.
Call for prices.

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