Pi Tape® Diameter Measuring Tapes
information  specials  how to read  link to price list  digital tapes
The periphery tape. exemplified by Pi Tape® brand tape, provides a quick, accurate and easy method of reading true diameters of both round and outofround forms.
 Perfect for measurement of thin or soft walled parts  large
or small.
 Pi Tape gages consist of a narrow metal ribbon bearing special
graduations.
These graduations are designed to convert circumferential distance into diameter measurement so the observer can read the diameter directly from the scale.
 Tapes are checked over master gages at .001'"(.03mm)
accuracy for standard tapes up to 144" (3600mm).
Certificate of accuracy traceable to National Institute of Standards and Technology is furnished.
 Pi Tape gages are a precision tool made of 1095 clock spring
steel (on request 420 stainless steel  for use in a corrosive
atmosphere).
They require a minimum of maintenance, but we do recommend a quick wipe with an oil moistened cloth after use. A light gun oil works very well.
Make sure the tape has not been dented or kinked. This may
affect the accuracy of the tape.
Pi Tape gages are invaluable tools to the aerospace field as
well as the plastic pipe industry. The variety of uses are infinite.
In stock... tapes ranging from 3/4"7" to 132"144" diameter available for same day shipping.
2019 prices subject to change
Part No.  O.D,Outside Diameter Measuring Range 
Description  Standard OD  Stainless Steel OD  EZ Read OD  Inside Diameter  
Clock Steel  part number ends in SS  part number ends in EZ  part number ends in ID  
special order  special order  special order  
order online  delivery 68 weeks  delivery 68 weeks  delivery 68 weeks  
PI000  1/22"  .500 to 2" Diameter Tape  $368.08  $569.18  $604.03  
PI01  3/47"  .75 to 7" Diameter Tape  $264.26  $528.53  $500.21  $311.45  
PI1  212"  2 to 12" Diameter Tape  $264.26  $528.53  $500.21  $311.45  
PI1SP  224"  2 to 24" Diameter Tape  $415.27  $714.38  $783.35  $462.46  
PI2  1224"  12 to 24" Diameter Tape  $287.86  $557.57  $523.81  $335.05  
PI2SP  1236"  12 to 36" Diameter Tape  $443.59  $749.23  $906.05  $490.78  
PI3  2436"  24" to 36" Diameter Tape  $311.45  $586.61  $547.40  $358.64  
PI3SP  2448"  24 to 48" Diameter Tape  $467.18  $836.35  $953.24  $514.37  
PI4  3648"  36 to 48" Diameter Tape  $335.05  $673.73  $618.19  $382.24  
PI5  4860"  48 to 60" Diameter Tape  $377.52  $726.00  $660.66  $424.71  
PI6  6072"  60 to 72"Diameter Tape  $415.27  $772.46  $698.41  $462.46  
PI7  7284"  72 to 84" Diameter Tape  $443.59  $865.39  $797.51  $490.78  
PI8  8496"  84 to 96" Diameter Tape  $495.50  $929.28  $849.42  $542.69  
PI9  96108"  96 to 108" Diameter Tape  $519.09  $958.32  $873.02  $566.28  
PI10  108120"  108 to 120" Diameter Tape  $542.69  $987.36  $896.61  $589.88  
PI11  120132"  120 to 132"Diameter Tape  $608.75  $1,068.67  $962.68  $655.94  
PI12  132144"  132 to 144" Diameter Tape  $655.94  $1,126.75  $1,009.87  $703.13 
In stock... tapes ranging from 38200mm to 33003600mm diameter available for same day shipping.
2019 prices subject to change
Part No.  Description  Standard  Stainless Steel  EZ Read  Inside Diameter  
Clock Steel  part number ends in SS  part number ends in EZ  part number ends in ID  
special order  special order  special order  
order online  delivery 68 weeks  delivery 68 weeks  delivery 68 weeks  
PIM0  28200mm Diameter Tape  $306.74  $569.18  $542.69  $353.93  
PIM1  100300mm Diameter Tape  $320.89  $598.22  $556.84  $368.08  
PIM1SP  50600mm Diameter Tape  $575.72  $911.86  $1,009.87  $622.91  
PIM2  300600mm Diameter Tape  $344.49  $627.26  $580.44  $391.68  
PIM2SP  300900mm Diameter Tape  $613.47  $958.32  $1,066.49  $660.66  
PIM3  600900mm Diameter Tape  $386.96  $679.54  $622.91  $434.15  
PIM3SP  6001200mm Diameter Tape  $660.66  $1,074.48  $1,113.68  $707.85  
PIM4  9001200mm Diameter Tape  $453.02  $818.93  $736.16  $500.21  
PIM5  12001500mm Diameter Tape  $537.97  $923.47  $821.11  $585.16  
PIM6  15001800mm Diameter Tape  $585.16  $981.55  $868.30  $632.35  
PIM7  18002100mm Diameter Tape  $660.66  $1,132.56  $1,014.59  $707.85  
PIM8  21002400mm Diameter Tape  $707.85  $1,190.64  $1,061.78  $755.04  
PIM9  24002700mm Diameter Tape  $755.04  $1,248.72  $1,108.97  $802.23  
PIM10  27003000mm Diameter Tape  $825.83  $1,335.84  $1,179.75  $873.02  
PIM11  30003300mm Diameter Tape  $873.02  $1,393.92  $1,226.94  $920.21  
PIM12  33003600mm Diameter Tape  $920.21  $1,452.00  $1,274.13  $967.40  
Standard clock steel will be supplied unless specified otherwise.  
to order Stainless Steel add SS to end of part number 
Extra Large Diameter Inch size tapes over 144" diameter ( special order )
1095 Spring Steel  716 Stainless Steel  Blue Easy to Read Style  White Easy to Read Style  
(black numbers on silver)  (black numbers on silver)  (white numbers on blue)  (blue numbers on white)  
Diameter Range O.D.  Part#  Part # 

Part#  
144"  156"  P13  PI13SS  PI13EZ  PI13WEZ  
156"  168"  PI14  PI14SS  PI14EZ  PI14WEZ  
168"  180"  PI15  PI15SS  PI15EZ  PI15WEZ  
180"  192"  PI16  PI16SS  PI16EZ  PI16WEZ  
192"  204"  PI17  PI17SS  PI17EZ  PI17WEZ  
204"  216"  PI18  PI18SS  PI18EZ  PI18WEZ  
216"  228"  PI19  PI19SS  PI19EZ  PI19WEZ  
228"  240"  PI20  PI20SS  PI20EZ  PI20WEZ  
240"  252"  PI21  PI21SS  PI21EZ  PI21WEZ  
252"  264"  PI22  PI22SS  PI22EZ  PI22WEZ  
264"  276"  PI23  PI23SS  PI23EZ  PI23WEZ  
276"  288"  PI24  PI24SS  PI24EZ  PI24WEZ  
288"  300"  PI25  PI25SS  PI25EZ  PI25WEZ  
300"  312"  PI26  PI26SS  PI26EZ  PI26WEZ  
312"  324"  PI27  PI27SS  PI27EZ  PI27WEZ  
324"  336"  PI28  PI28SS  PI28EZ  PI28WEZ  
336"  348"  PI29  PI29SS  PI29EZ  PI29WEZ  
348"  360"  PI30  PI30SS  PI30EZ  PI30WEZ  
360"  372"  PI31  PI31SS  PI31EZ  PI31WEZ  
372"  384"  PI32  PI32SS  PI32EZ  PI32WEZ  
384"  396"  PI33  PI33SS  PI33EZ  PI33WEZ  
396"  408"  PI34  PI34SS  PI34EZ  PI34WEZ  
408"  420"  PI35  PI35SS  PI35EZ  PI35WEZ  
420"  432"  PI36  PI36SS  PI36EZ  PI36WEZ  
432"  444"  PI37  PI37SS  PI37EZ  PI37WEZ  
444"  456"  PI38  PI38SS  PI38EZ  PI38WEZ  
456"  468"  PI39  PI39SS  PI39EZ  PI39WEZ  
468"  480"  PI40  PI40SS  PI40EZ  PI40WEZ  
480"  492"  PI41  PI41SS  PI41EZ  PI41WEZ  
492"  504"  PI42  PI42SS  PI42EZ  PI42WEZ  
504"  516"  PI43  PI43SS  PI43EZ  PI43WEZ  
516"  528"  PI44  PI44SS  PI44EZ  PI44WEZ  
528"  540"  PI45  PI45SS  PI45EZ  PI45WEZ  
Standard tapes are manufactured with a 1/4" wide Vernier Gage, a 1/2" wide Main Body and a 1/4" wide Gage Member  
Calibration Report traceable to N.I.S.T. furnished with each new tape at no additional charge.  
Our calibration lab is compliant with ANSI/NCSL Z54011994, ISO/IEC 17025, ISO 100121, MILSTD 45662A and 10CFR21  
Tolerances for standard range tapes (12" of usable range) listed above  
Tape sizes between 144"  216" .003" tolerance  Tape sizes between 360"  432" .008" tolerance  
Tape sizes between 216"  288" .005" tolerance  Tape sizes between 432"  504" .009" tolerance  
Tape sizes between 288"  360" .006" tolerance  Tape sizes between 504"  576" .011" tolerance  
Extra Large Diameter Metric sizes tapes over 3600mm diameter ( special order )
Materials Available  1095 Spring Steel  716 Stainless Steel  Blue Easy to Read Style  
(black numbers on silver)  (black numbers on silver)  (white numbers on blue)  
Diameter Range O.D.  Part#  Part#  Part#  
36003900mm  PIM13  PIM13SS  PIM13EZ  
39004200mm  PIM14  PIM14SS  PIM14EZ  
42004500mm  PIM15  PIM15SS  PIM15EZ  
45004800mm  PIM16  PIM16SS  PIM16EZ  
48005100mm  PIM17  PIM17SS  PIM17EZ  
51005400mm  PIM18  PIM18SS  PIM18EZ  
54005700mm  PIM19  PIM19SS  PIM19EZ  
57006000mm  PIM20  PIM20SS  PIM20EZ  
60006300mm  PIM21  PIM21SS  PIM21EZ  
63006600mm  PIM22  PIM22SS  PIM22EZ  
66006900mm  PIM23  PIM23SS  PIM23EZ  
69007200mm  PIM24  PIM24SS  PIM24EZ  
72007500mm  PIM25  PIM25SS  PIM25EZ  
75007800mm  PIM26  PIM26SS  PIM26EZ  
78008100mm  PIM27  PIM27SS  PIM27EZ  
81008400mm  PIM28  PIM28SS  PIM28EZ  
84008700mm  PIM29  PIM29SS  PIM29EZ  
87009000mm  PIM30  PIM30SS  PIM30EZ  
90009300mm  PIM31  PIM31SS  PIM31EZ  
93009600mm  PIM32  PIM32SS  PIM32EZ  
96009900mm  PIM33  PIM33SS  PIM33EZ  
990010,200mm  PIM34  PIM34SS  PIM34EZ  
10,20010,500mm  PIM35  PIM35SS  PIM35EZ  
10,50010,800mm  PIM36  PIM36SS  PIM36EZ  
10,80011,100mm  PIM37  PIM37SS  PIM37EZ  
11,10011,400mm  PIM38  PIM38SS  PIM38EZ  
11,40011,700mm  PIM39  PIM39SS  PIM39EZ  
11,70012,000mm  PIM40  PIM40SS  PIM40EZ  
12,00012,300mm  PIM41  PIM41SS  PIM41EZ  
12,30012,600mm  PIM42  PIM42SS  PIM42EZ  
12,60012,900mm  PIM43  PIM43SS  PIM43EZ  
12,90013,200mm  PIM44  PIM44SS  PIM44EZ  
13,20013,500mm  PIM45  PIM45SS  PIM45EZ  
Standard tapes are manufactured with a 6.35mm wide Vernier Gage, a 12.7mm wide Main Body and a 6.35mm wide Gage Member  
Calibration Report traceable to N.I.S.T. furnished with each new tape at no additional charge.  
Our calibration lab is compliant with ANSI/NCSL Z54011994, ISO/IEC 17025, ISO 100121, MILSTD 45662A and 10CFR21  
Tolerances for standard range tapes (300mm of usable range) listed above  
Tape sizes between 36005400mm .09mm tolerance  Tape sizes between 900010,800mm .23mm tolerance  
Tape sizes between 54007200mm .14mm tolerance  Tape sizes between 10,80012,600mm .27mm tolerance  
Tape sizes between 72009000mm .18mm tolerance  Tape sizes between 12,60014,400mm .32mm tolerance 
To Read Outside Diameter Tapes
How to use the tape
TAPES GRADUATED IN INCHES
Standard width is 1/4" gage member. 1/8, 3/8 or 1/2" widths also available  extra charge per tape. Vernier scale divides each graduation on tape body into 25 parts or .001 of an inch Example: In the illustration the divisions to the left of the Vernier zero are 20 inches plus 1 division, or 20.025. The 15th line on the Vernier coincides with a line on the Gage Member. This is added to the 20.025, making a total diameter reading of 20.040, which is the true diameter reading as measured on the outside circumference. When reading the tape, apply a snug pull of 5 lbs. tension, first making sure the tape and part have been properly cleaned. When using a standard O.D. tape on an I.D. surface, add double the tape thickness to the reading to arrive at the I.D. of the part (0 lbs. tension). It is suggested that direct I.D. tapes be used for Inside Diameter readings. Instructions on how to measure with Pi Tape® Inch Outside Diameter tapes on YouTube
TAPES GRADUATED IN MILLIMETERS
Standard width is 6.35 mm gage member. 4.76, 9.53 or 12.70 mm widths also available  extra charge per tape
Each line on the Gage Member of the tape represents
.5mm of Diameter, while each line on the Vernier represents .01mm.
The zero on the Vernier is past the 661.5 line on the Gage Member
of the tape. Now find the line on the Vernier which corresponds
exactly with the line above. The example shows it to be the 23
line which equals .23mm. This added to the 661.5 reading gives
an outside diameter of 661.73mm.
When reading the OD tape, apply a snug pull of 2.25kg. tension,
first making sure the tape and part have been properly cleaned.
Inside diameters can be read in the same manner by adding double
the tape thickness to the reading using the standard outside
diameter tape ( 0kg tension). Standard tapes are .25mm thick;
thus .50mm would be added to the reading. It is suggested that
direct I.D. tapes be used for Inside Diameter readings.
As a suggestion for checking very large diameterspieces of masking tape may be used to hold the tape in proper parallel position. Instructions on how to measure with Pi Tape® Metric Outside Diameter tapes on YouTube
Care
When not in use, wipe clean and apply a light rust preventive
oil. Store in tape container.
No periodic adjustments are needed.
Make sure the tape has not been stepped on or kinked, which may
destroy the accuracy.
link to special pi tape page

Pi Tape® brand Precision ORing Inside Diameter tapes are specifically designed to achieve quick, accurate inside diameter measurements of ORings and other softwalled parts.
link to Pi Tape® Brand economy extended range diameter tapes these tapes have a range of 72",
an economical alternative when an accuracy of .01 is an acceptable tolerance.