Machinery's Handbook, 31st Edition
1888 Taper Pins Designation: Taper pins are designated by the following data in the sequence shown: Product name (noun first), class, size number (or decimal equivalent), length (fraction or three-place decimal equivalent), material, and protective finish, if required. Examples: Pin, Taper (Commercial Class) No. 0 × 3 ∕ 4 , Steel Pin, Taper (Precision Class) 0.219 × 1.750, Steel, Zinc Plated Table 5. Nominal Diameter at Small Ends of Standard Taper Pins Pin Length in inches Pin Number and Small End Diameter for Given Length 0 1 2 3 4 5 6 7 8 9 10 3 ∕ 4 0.140 0.156 0.177 0.203 0.235 0.273 0.325 0.393 0.476 0.575 0.690 1 0.135 0.151 0.172 0.198 0.230 0.268 0.320 0.388 0.471 0.570 0.685 1 1 ∕ 4 0.130 0.146 0.167 0.192 0.224 0.263 0.315 0.382 0.466 0.565 0.680 1 1 ∕ 2 0.125 0.141 0.162 0.187 0.219 0.258 0.310 0.377 0.460 0.560 0.675 1 3 ∕ 4 0.120 0.136 0.157 0.182 0.214 0.252 0.305 0.372 0.455 0.554 0.669 2 0.114 0.130 0.151 0.177 0.209 0.247 0.299 0.367 0.450 0.549 0.664 2 1 ∕ 4 0.109 0.125 0.146 0.172 0.204 0.242 0.294 0.362 0.445 0.544 0.659 2 1 ∕ 2 0.104 0.120 0.141 0.166 0.198 0.237 0.289 0.356 0.440 0.539 0.654 2 3 ∕ 4 0.099 0.115 0.136 0.161 0.193 0.232 0.284 0.351 0.434 0.534 0.649 3 0.094 0.110 0.131 0.156 0.188 0.227 0.279 0.346 0.429 0.528 0.643 3 1 ∕ 4 … … … 0.151 0.182 0.221 0.273 0.340 0.424 0.523 0.638 3 1 ∕ 2 … … … 0.146 0.177 0.216 0.268 0.335 0.419 0.518 0.633 3 3 ∕ 4 … … … 0.141 0.172 0.211 0.263 0.330 0.414 0.513 0.628 4 … … … 0.136 0.167 0.206 0.258 0.326 0.409 0.508 0.623 4 1 ∕ 4 … … … 0.131 0.162 0.201 0.253 0.321 0.403 0.502 0.617 4 1 ∕ 2 … … … 0.125 0.156 0.195 0.247 0.315 0.398 0.497 0.612 5 … … … … 0.146 0.185 0.237 0.305 0.389 0.487 0.602 5 1 ∕ 2 … … … … … … … 0.294 0.377 0.476 0.591 6 … … … … … … … 0.284 0.367 0.466 0.581 Drilling Specifications for Taper Pins.— When helically fluted taper pin reamers are used, the diameter of the through hole drilled prior to reaming is equal to the diameter at the small end of the taper pin. (See Table 5 .) However, when straight fluted taper reamers are to be used, it may be necessary, for long pins, to step drill the hole before reaming, the number and sizes of the drills to be used depending on the depth of the hole (pin length). To determine the number and sizes of step drills required: Find the length of pin to be used at the top of the chart on page 1889 and follow this length down to the intersection with that heavy line which represents the size of taper pin (see taper pin numbers at the right-hand end of each heavy line). If the length of pin falls between the first and second dots, counting from the left, only one drill is required. Its size is indicated by following the nearest horizontal line from the point of intersection (of the pin length) on the heavy line over to the drill diameter values at the left. If the intersection of pin length comes between the second and third dots, then two drills are required. The size of the smaller drill then corresponds to the intersection of the pin length and the heavy line and the larger is the corresponding drill diameter for the intersection of one-half this length with the heavy line. Should the pin length fall between the third and fourth dots, three drills are required. The smallest drill will have a diameter corresponding to the intersection of the total pin length with the heavy line, the next in size will have a diameter corresponding to the intersection of two-thirds of this length with the heavy line, and the largest will have a diameter corresponding to the intersection of one-third of this length with the heavy line. Where the intersection falls between two drill sizes, use the smaller.
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