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RODENT REPEL TECHNOLOGY Sack fut te all Sefit Restack everything on Pallet close to shep Take Down loads She Look what happens in the case of a 1/4" bolt. NC thread for 14" is 20 threads per inch, NF thread for 14" bolt is 28 threads per inch. For a 14" bolt, the NC thread pitch is 1/20 of an inch and for NF it is Vs of an inch. We normally divide the inch into half, quarters, eighths, sixteenths, etc. We have no convenient means of measuring Yo or Vas of an inch. Following is a partial list of NC and NF thread specifi- cations up to 1", including tap drill sizes are shown in Table 3. is measured in millimeters. inch fractions. Wrench size for metric bolt heads and nuts Table 4 lists metric thread pitch for diameter up to 27mm. This compares with the U.S. thread table extend- ing to 1" diameter, since 27mm is slightly over 1". UNIFIED STANDARD METRIC THREADS All dimensions in millimeters Diam Pitch Diam Pitch Diam 2 0.45 Pitch 6 1.00 16 2.5 0.45 2.00 7 1.00 18 NF Threads 3 0.60 2.50 8 1.25 NC Threads 20 Threads Tap 3.5 0.60 2.50 9 Thread's Tap 1.25 Drill Size inch D 22 2.50 4 inch 0.75 10 1.50 Size 24 32 8 39 6 32 29 25 10 24 888 35 6 40 33 3.00 4.5 0.75 11 1.50 27 8 40 28 227 3.00 5 0.90 12 1.75 10 32 21 5.5 0.90 14 2.00 12 14" 20 22 24 16 12 28 14 7 14" 28 3 TABLE 4 546 18 F 5/16 24 ADVICE Metric Thread Table 16 5/16" 24 2164 14 The 20 1/2" 20 2964 12 13 9/16 18 96 12 4/8" 18 37/64 56" 11 3/4 16 1146" 10 6 7/8" 14 13/16 1" 12 15/16 1" 8 TABLE 3 National Course and Fine Thread Specifications You can get a pocket-size card with this listing at most tool supply houses. Carry the card for convenience, but try to memorize the common size bolt threads. Metric Standards The United States thread specification lists number of threads per inch, according to diameter. Now look at the metric system. [Refer to Table 4] To begin with, it has only one class of thread instead of two. The closest met- ric size to the 1/4" bolt in the previous example is 6mm. The Unified Standard Metric Thread table shows a pitch of 1.0mm for a 6mm thread. Since there are 10mm in one centimeter. centimeter, this pitch is easily calculated as 10 threads per Metric threads are specified by pitch, rather than num- ber of threads per unit of length. Both U.S. and metric thread profiles comply with the Unified Standard (60°) angle between sides, rounded crest and root, etc.). Wrench size for U.S. bolt heads and nuts is measured in Using the U.S. Standard, you need to know whether the thread is NC or NF before obtaining bolts and nuts. There is no confusion in the metric system because there is only one pitch for each diameter. If you need a nut for fine thread. a 16mm bolt, you needn't worry whether it is coarse or When fitting a nut to a bolt, do not intermix metric and U.S. nuts or bolts. A 10mm metric bolt is only slightly larger than a ¾" U.S. bolt. The metric thread pitch for 10mm is 1.5mm. This translates to between 16 and 17 threads per inch. U.S. NC thread for " is 16 threads per inch. Therefore a metric 10mm bolt looks just like a " NC bolt. A 10mm nut will almost fit a " NC bolt, but it's obviously not correct. Fits The six categories of fits for threads are 1 A&B, 2 A&B, and 3 A&B. The letter A indicates external threads (bolts, studs, and screws) and the letter B indicates inter- nal threads (nuts, and threaded holes). This, in effect, gives three classes. Number 1 is relatively loose where precision is not required. Stove bolts are cut at Class 1 fit. Class 2 provides a fairly accurate fit, with minimal clear- ance. Most general purpose bolts and nuts are class 2 fit. Class 3 is a very precise fit, used where extreme accuracy is required. Special aircraft bolts are Class 3 fit. Other Threads Pipe threads have a unique standard, and are cut tapered to ensure a seal. The standard taper for pipe threads is 1/16" per inch or 3/4" per foot. You will find a orough explanat lydraulics. Electrical condi ard as pipe threa oose fit. Straight iving a smooth in Geared elevato o transmit pow heave. The most power are Brown hread profiles, B), and triple-le Lead is the di revolution. In as tical. In a doubl triple-lead wor worms are use machines. 28. The most co fas on 14