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BOX 232 • MINNEAPOLIS, KS • 67467HUYETT.COM • 785-392-3017
Prices, materials, dimensions, tolerances, designs, and grades subject to change without notice. © 2015 G.L. Huyett
SALES@HUYETT.COM • FAX 785-392-2845
248
TAPER PIN FEATURESTaper pins are arguably one of the simplest pin designs available, and along with dowel pins, are the oldest. Taper pins are turned from barstock to varying tolerances depending on the specification. This production technique is slower than the heading and grinding process used to manufacture dowel pins, and slower than rolling steel pins.
HOW TO MEASURE THE TAPEREASY INSTALLATION
EXTERNALLY THREADED INTERNALLY THREADEDTAPER PINS
Threaded taper pins are used in blind holes
Removal is achieved by screwing a nut down onto the threads
Internally Thread For use as a pull dowel
Standard taper pins are used as positioning components for
transmitting low torques
pound a punch or drive tool into small end To remove
Tap wi th a hammer to
insert
#1, #2, #3 ...or 63µ
MICROFINISHDESIGNATIONS TAPER
Taper pins are called out by a number and length
"I need a #3 by 2 inch"
The number refers to the diameter of the large end of imperial pins. To get the diameter of the small end, multiply the length by .02083 and subtract from the decimal size of the large end. See “Diameter Cross Reference,” page 249.
A 63 microfinish is standard to allow smooth insertion
ASME B18.8.2 specifies a taper of 1/4" per foot (0.02083" per inch)
63
Tapers are expressed in terms of rise over run. In other words, the amount of taper is stated per linear units of measure. A 1/4" taper per foot means that for every 12" in linear distance (run) the thickness of the part (rise) decreases by .25" (1:48). Metric pins decrease by 1 mm for every 50 mm (1:50).
Run
Rise
Design Considerations
HUYETT.COM • 785-392-3017
Prices, materials, dimensions, tolerances, designs, and grades subject to change without notice. © 2015 G.L. Huyett
249
Page 251 Page 258 Page 264
TAPER PIN TYPES
To obtain diameter of small end (Y), multiply length (L) by .02083 and subtract from large end (X).
If a helically fluted taper reamer is used, the diameter of the small end of the pin is the size for the through drill.
Step drilling and using straight fluted reamers have specific requirements. Call for details.
Internal threads are used as an anchor for leverage during removal.
Simply designed pins that are hammered or driven into a tapered hole. 1/4" taper per linear foot.
External threads are used when a tapered pin has to be removed from the driven (large) end. Tightening a nut on the threads will unseat the pin.
Standard External Thread Internal Thread
DIAMETER CROSS REFERENCESTEP DRILLING TAPER PIN HOLES
Number Fractional Diameter
(Reference Only)
Decimaldiameter
#7/0 1/16" .063"
#6/0 5/64" .078"
#5/0 3/32" .094"
#4/0 7/64" .109"
#3/0 1/8" .125"
#2/0 9/64" .141"
#0 5/32" .156"
#1 11/64" .172"
#2 3/16" .193"
#3 7/32" .219"
#4 1/4" .250"
#5 19/64" .289"
#6 11/32" .341"
#7 13/32" .409"
#8 1/2" .492"
#9 19/32" .591"
#10 23/32" .706"
#11 55/64" .860"
#12 1-1/32" 1.032"
#13 1-15/32" 1.241"
#14 1-33/64" 1.523"
3rd
X
Y
2nd1st L
Design Considerations
ALWAYS TEST STEP-DRILLED
HOLES FOR VERIFICATION
PRIOR TO PRODUCTION
Step Drilled HOle Installed Pin
BOX 232 • MINNEAPOLIS, KS • 67467HUYETT.COM • 785-392-3017
Prices, materials, dimensions, tolerances, designs, and grades subject to change without notice. © 2015 G.L. Huyett
SALES@HUYETT.COM • FAX 785-392-2845
250
QUICK REFERENCE GUIDE
Appl ications
Taper Pins are used to align and hold assembly Components toge ther
Common Names
Applicable Standards
Fabrication How to Identify
Common Uses
Comments
Taper Pin ASME B18.8.2 , MS 24692, AN 386, DIN 1, DIN 7977 (external thread); DIN 7978 (internal thread)
Not applicable to Standard Taper Pins sizes #11 – #14
Turning, thread rolling (if threaded)
Nominal diameter × nominal length; The nominal diameter of imperial pins is called out by a number used to signify the dimension.
Low torque positioning and locking. Often found on printing presses and other large mechanical assemblies. Mostly used in original equipment.
The diameter of imperial pins is measured at the large end. Metric pins are measured at the small end.T
ap
er
Taper pins are a highly precise locating pin. The taper causes constant contact through the length of the pin as well as the entire cross section creating exceptional holding power. It also allows for a repeatable firm seat and exact location when reinserted after disassembly.
External Threaded Taper Pins are used to Hold a clock Hand
Mechanism Together
Internal Threaded Taper Pins are Used in applications where a flush
surface is desired
TAPER PIN USE
EXTERNAL THREADED TAPER PIN USE INTERNAL THREADED TAPER PIN USE
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