Threads and Threading - Sportpilot.info

More documents

Recommendations

Info

1868 DRYSEAL PIPE THREADS For more complete specifications for production and acceptance of Dryseal pipe threads, see ANSI B1.20.3 (Inch) and ANSI B1.20.4 (Metric Translation), and for gaging and inspection, see ANSI B1.20.5 (Inch) and ANSI B1.20.6M (Metric Translation). Designation of Dryseal Pipe Threads: The standard Dryseal pipe threads are designated by specifying in sequence nominal size, thread series symbol, and class: Examples: 1 ⁄ 8-27 NPTF-1; 1 ⁄ 8-27 PTF-SAE SHORT; and 3 ⁄ 8-18 NPTF-1 AFTER PLAT- ING. Size Table 8. Suggested Tap Drill Sizes for Internal Dryseal Pipe Threads Probable Drill Oversize Cut (Mean) All dimensions are given in inches. Taper Pipe Thread Straight Pipe Thread Minor Diameter At Distance Drill Size a L 1 From Large End Machinery's Handbook 27th Edition L 1 + L 3 From Large End Without Reamer a Some drill sizes listed may not be standard drills. Minor Diameter With Reamer NPSF NPSI Drill Size a 1 ⁄16 –27 0.0038 0.2443 0.2374 “C” (0.242) “A” (0.234) 0.2482 0.2505 “D” (0.246) 1 ⁄8 –27 0.0044 0.3367 0.3298 “Q” (0.332) 21 ⁄64 (0.328) 0.3406 0.3429 “R” (0.339) 1 ⁄4–18 0.0047 0.4362 0.4258 7 ⁄16 (0.438) 27 ⁄64 (0.422) 0.4422 0.4457 7 ⁄16 (0.438) 3 ⁄8 –18 0.0049 0.5708 0.5604 9 ⁄16 (0.562) 9 ⁄16 (0.563) 0.5776 0.5811 37 ⁄64 (0.578) 1 ⁄2 –14 0.0051 0.7034 0.6901 45 ⁄64 (0.703) 11 ⁄16 (0.688) 0.7133 0.7180 45 ⁄64 (0.703) 3 ⁄4 –14 0.0060 0.9127 0.8993 29 ⁄32 (0.906) 57 ⁄64 (0.891) 0.9238 0.9283 59 ⁄64 (0.922) 1–11 1 ⁄ 2 0.0080 1.1470 1.1307 1 9 ⁄ 64 (1.141) 1 1 ⁄ 8 (1.125) 1.1600 1.1655 1 5 ⁄ 32 (1.156) 1 1 ⁄ 4 –11 1 ⁄ 2 0.0100 1.4905 1.4742 1 31 ⁄ 64 (1.484) 1 15 ⁄ 32 (1.469) … … … 1 1 ⁄ 2–11 1 ⁄ 2 0.0120 1.7295 1.7132 1 23 ⁄ 32 (1.719) 1 45 ⁄ 64 (1.703) … … … 2–11 1 ⁄ 2 0.0160 2.2024 2.1861 2 3 ⁄ 16 (2.188) 2 11 ⁄ 64 (2.172) … … … 2 1 ⁄ 2 –8 0.0180 2.6234 2.6000 2 39 ⁄ 64 (2.609) 2 37 ⁄ 64 (2.578) … … … 3–8 0.0200 3.2445 3.2211 3 15 ⁄ 64 (3.234) 3 13 ⁄ 64 (3.203) … … … Special Dryseal Threads.—Where design limitations, economy of material, permanent installation, or other limiting conditions prevail, consideration may be given to using a special Dryseal thread series. Dryseal Special Short Taper Pipe Thread, PTF-SPL SHORT: Threads of this series conform in all respects to PTF-SAE SHORT threads except that the full thread length has been further shortened by eliminating one thread at the small end of internal threads or one thread at the large end of external threads. Copyright 2004, Industrial Press, Inc., New York, NY
Machinery's Handbook 27th Edition BRITISH PIPE THREADS 1869 Dryseal Special Extra Short Taper Pipe Thread, PTF-SPL EXTRA SHORT: Threads of this series conform in all respects to PTF-SAE SHORT threads except that the full thread length has been further shortened by eliminating two threads at the small end of internal threads or two threads at the large end of external threads. Limitations of Assembly: Table 9 applies where Dryseal Special Short or Extra Short Taper Pipe Threads are to be assembled as special combinations. Table 9. Assembly Limitations for Special Combinations of Dryseal Threads Thread May Assemble witha May Assemble withb PTF-SAE SHORT INTERNAL PTF SPL SHORT EXTERNAL PTF SPL EXTRA SHORT EXTERNAL NPSF INTERNAL PTF SPL SHORT INTERNAL PTF SPL EXTRA SHORT INTERNAL NPTF or NPSI INTERNAL PTF SPL SHORT INTERNAL PTF SPL EXTRA SHORT INTERNAL PTF-SAE SHORT EXTERNAL NPTF EXTERNAL Dryseal Fine Taper Thread Series, F-PTF: The need for finer pitches for nominal pipe sizes has brought into use applications of 27 threads per inch to 1 ⁄ 4- and 3 ⁄ 8-inch pipe sizes. There may be other needs that require finer pitches for larger pipe sizes. It is recommended that the existing threads per inch be applied to the next larger pipe size for a fine thread series, thus: 1 ⁄ 4-27, 3 ⁄ 8-27, 1 ⁄ 2-18, 3 ⁄ 4-18, 1-14, 11 ⁄ 4-14, 11 ⁄ 2-14, and 2-14. This series applies to external and internal threads of full length and is suitable for applications where threads finer than NPTF are required. Dryseal Special Diameter-Pitch Combination Series, SPL-PTF: Other applications of diameter-pitch combinations have come into use where taper pipe threads are applied to nominal size thin wall tubing. These combinations are: 1 ⁄ 2-27, 5 ⁄ 8-27, 3 ⁄ 4-27, 7 a Only when the external thread or the internal thread or both are held closer than the standard tolerance, the external thread toward the minimum and the internal thread toward the maximum pitch diameter to provide a minimum of one turn hand engagement. At extreme tolerance limits the shortened full-thread lengths reduce hand engagement and the threads may not start to assemble. b Only when the internal thread or the external thread or both are held closer than the standard tolerance, the internal thread toward the minimum and the external thread toward the maximum pitch diameter to provide a minimum of two turns for wrench make-up and sealing. At extreme tolerance limits the shortened full-thread lengths reduce wrench make-up and the threads may not seal. ⁄ 8-27, and 1-27. This series applies to external and internal threads of full length and is applicable to thin wall nominal diameter outside tubing. Designation of Special Dryseal Pipe Threads: The designations used for these special dryseal pipe threads are as follows: 1 ⁄8-27 PTF-SPL SHORT 1 ⁄8-27 PTF-SPL EXTRA SHORT 1 ⁄2-27 SPL PTF, OD 0.500 Note that in the last designation the OD of tubing is given. British Standard Pipe Threads British Standard Pipe Threads for Non-pressure-tight Joints.—The threads in BS 2779:1973, “Specifications for Pipe Threads where Pressure-tight Joints are not Made on the Threads”, are Whitworth form parallel fastening threads that are generally used for fastening purposes such as the mechanical assembly of component parts of fittings, cocks and valves. They are not suitable where pressure-tight joints are made on the threads. The crests of the basic Whitworth thread form may be truncated to certain limits of size given in the Standard except on internal threads, when they are likely to be assembled with external threads conforming to the requirements of BS 21 “British Standard Pipe Threads for Pressure-tight Joints” (see page 1870). Copyright 2004, Industrial Press, Inc., New York, NY
Page 1 and 2:
SCREW THREAD SYSTEMS 1725 Screw Thr
Page 3 and 4:
Machinery's Handbook 27th Edition O
Page 5 and 6:
Machinery's Handbook 27th Edition T
Page 7 and 8:
SCREW THREADS 1727 ISO Metric Threa
Page 9 and 10:
Machinery's Handbook 27th Edition S
Page 11 and 12:
Machinery's Handbook 27th Edition S
Page 13 and 14:
UNIFIED SCREW THREADS 1733 UN Inter
Page 15 and 16:
Machinery's Handbook 27th Edition U
Page 17 and 18:
Nominal Size, Threads per Inch, and
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
UNIFIED SCREW THREADS 1765 Table 4c
Page 47 and 48:
Page 49 and 50:
UNIFIED SCREW THREADS 1769 Table 5d
Page 51 and 52:
UNIFIED SCREW THREADS 1771 Table 5e
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Machinery's Handbook 27th Edition M
Page 59 and 60:
MINIATURE SCREW THREADS 1779 Table
Page 61 and 62:
;; ;;;; ;;;;;; ;;;;;;;; ;;;;;;;;;;
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
METRIC SCREW THREADS M PROFILE 1787
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Pitch P METRIC SCREW THREADS M PROF
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Basic Thread METRIC SCREW THREADS M
Page 83 and 84:
Page 85 and 86:
METRIC SCREW THREADS MJ PROFILE 180
Page 87 and 88:
TRAPEZOIDAL METRIC THREADS 1807 Tol
Page 89 and 90:
TRAPEZOIDAL METRIC THREADS 1809 Tab
Page 91 and 92:
120 140 160 180 110 130 150 170 Mac
Page 93 and 94:
Page 95 and 96:
Pitch P BRITISH STANDARD ISO METRIC
Page 97 and 98: BRITISH STANDARD ISO METRIC SCREW T
Page 99 and 100: BRITISH STANDARD ISO METRIC SCREW T
Page 101 and 102: Nominal Diametera BRITISH STANDARD
Page 103 and 104: Nominal Diameter BRITISH STANDARD I
Page 105 and 106: Machinery's Handbook 27th Edition A
Page 109 and 110: Table 2b. Limiting Dimensions of AN
Page 111 and 112: Machinery's Handbook 27th Edition T
Page 113 and 114: CENTRALIZING ACME SCREW THREADS 183
Page 117 and 118: Machinery's Handbook 27th Edition C
Page 119 and 120: Table 8c. Limiting Dimensions of Am
Page 123 and 124: Machinery's Handbook 27th Edition S
Page 125 and 126: Table 14b. Limiting Dimensions for
Page 127 and 128: Nominal Sizes Table 15. Stub Acme S
Page 129 and 130: Machinery's Handbook 27th Edition B
Page 131 and 132: Thds. a per Inch ANSI BUTTRESS THRE
Page 133 and 134: ANSI BUTTRESS THREADS 1853 Table 3.
Page 135 and 136: ANSI BUTTRESS THREADS 1855 The majo
Page 137 and 138: Machinery's Handbook 27th Edition W
Page 139 and 140: WHITWORTH THREADS 1859 Table 3. Bri
Page 141 and 142: AMERICAN PIPE THREADS 1861 Table 1a
Page 143 and 144: AMERICAN PIPE THREADS 1863 guide fo
Page 147: DRYSEAL PIPE THREADS 1867 b PTF-SAE
Page 151 and 152: BRITISH PIPE THREADS 1871 British S
Page 153 and 154: Machinery's Handbook 27th Edition T
Page 155 and 156: HOSE COUPLING SCREW THREADS 1875 Th
show all

Threads and Threading - Sportpilot.info

Create successful ePaper yourself

Delete template?

Save as template?