IFI 115 Flange 12-Point Screws
Dimensions of Flange 12-Point Screws
| Nominal Size or Basic Major Dia of Thread | E | C | F | G | H | J | K | Runout of Bearing Surface FIM | M | La | Bearing Surface Juncture Radius | X | A | T | LT | Y | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Body Dia Min (Max Equal to Nom Size) | Flange Dia | Width Across Flats |
Width Across Corners | Head Height | Wrenching Height | Flange Thickness | Fillet Extension | Fillet Length | Chamfer or Radius | Gaging Ring Thickness | Gaging Ring Dia | Thread Length | Transition Thread Length | |||||||||
| Max | Min | Max | Min | Min | Max | Min | Min | Max | Max | Min | Max | Min | Max | Max | Min | Max | Min | Basic | Max | |||
| ¼ | 0.2500 | 0.2435 | 0.375 | 0.365 | 0.252 | 0.244 | 0.278 | 0.260 | 0.15 | 0.058 | 0.007 | 0.014 | 0.009 | 0.087 | 0.007 | 0.020 | 0.0525 | 0.0522 | 0.2783 | 0.2780 | 1.000 | 0.25 |
| 5⁄16 | 0.3125 | 0.3053 | 0.469 | 0.457 | 0.315 | 0.306 | 0.348 | 0.312 | 0.18 | 0.074 | 0.006 | 0.017 | 0.012 | 0.087 | 0.009 | 0.020 | 0.0600 | 0.0597 | 0.3483 | 0.3480 | 1.125 | 0.28 |
| ⅜ | 0.3750 | 0.3678 | 0.562 | 0.550 | 0.377 | 0.368 | 0.420 | 0.375 | 0.21 | 0.095 | 0.010 | 0.020 | 0.015 | 0.087 | 0.012 | 0.020 | 0.0711 | 0.0708 | 0.4203 | 0.4200 | 1.250 | 0.31 |
| 7⁄16 | 0.4375 | 0.4294 | 0.656 | 0.642 | 0.438 | 0.429 | 0.489 | 0.438 | 0.26 | 0.109 | 0.011 | 0.023 | 0.018 | 0.087 | 0.014 | 0.030 | 0.0840 | 0.0837 | 0.4893 | 0.4890 | 1.375 | 0.36 |
| ½ | 0.5000 | 0.4919 | 0.750 | 0.735 | 0.502 | 0.493 | 0.562 | 0.500 | 0.29 | 0.129 | 0.013 | 0.026 | 0.020 | 0.087 | 0.016 | 0.030 | 0.0948 | 0.0945 | 0.5623 | 0.5620 | 1.500 | 0.38 |
| 9⁄16 | 0.5625 | 0.5538 | 0.844 | 0.828 | 0.564 | 0.555 | 0.633 | 0.583 | 0.33 | 0.145 | 0.015 | 0.029 | 0.022 | 0.157 | 0.018 | 0.030 | 0.1071 | 0.1068 | 0.6333 | 0.6330 | 1.625 | 0.42 |
| ⅝ | 0.6250 | 0.6183 | 0.938 | 0.921 | 0.627 | 0.618 | 0.705 | 0.625 | 0.36 | 0.166 | 0.016 | 0.032 | 0.024 | 0.157 | 0.021 | 0.040 | 0.1179 | 0.1176 | 0.7053 | 0.7050 | 1.750 | 0.46 |
| ¾ | 0.7500 | 0.7500 | 1.125 | 1.107 | 0.752 | 0.743 | 0.847 | 0.750 | 0.44 | 0.200 | 0.020 | 0.039 | 0.030 | 0.157 | 0.025 | 0.040 | 0.1416 | 0.1413 | 0.8473 | 0.8470 | 2.000 | 0.50 |
| ⅞ | 0.8750 | 0.8647 | 1.312 | 1.293 | 0.877 | 0.866 | 0.987 | 0.875 | 0.51 | 0.234 | 0.023 | 0.044 | 0.034 | 0.227 | 0.031 | 0.040 | 0.1656 | 0.1653 | 0.9873 | 0.9870 | 2.250 | 0.56 |
| 1 | 1.0000 | 0.9866 | 1.500 | 1.479 | 1.003 | 0.991 | 1.130 | 1.000 | 0.60 | 0.268 | 0.026 | 0.050 | 0.040 | 0.332 | 0.034 | 0.040 | 0.1893 | 0.1890 | 1.1303 | 1.1300 | 2.500 | 0.62 |
| 1-1/8 | 1.1250 | 1.1086 | 1.688 | 1.665 | 1.128 | 1.115 | 1.271 | 1.125 | 0.66 | 0.310 | 0.029 | 0.055 | 0.045 | 0.332 | 0.039 | 0.050 | 0.2109 | 0.2106 | 1.2713 | 1.2710 | 2.750 | 0.71 |
| 1-1/4 | 1.2500 | 1.2305 | 1.875 | 1.852 | 1.253 | 1.240 | 1.414 | 1.250 | 0.73 | 0.350 | 0.033 | 0.060 | 0.050 | 0.332 | 0.044 | 0.050 | 0.2331 | 0.2328 | 1.4143 | 1.4140 | 3.000 | 0.77 |
| 1-3/8 | 1.3750 | 1.3566 | 2.062 | 2.038 | 1.378 | 1.365 | 1.556 | 1.375 | 0.80 | 0.392 | 0.036 | 0.065 | 0.055 | 0.332 | 0.048 | 0.050 | 0.2544 | 0.2541 | 1.5563 | 1.5560 | 3.250 | 0.83 |
| 1-1/2 | 1.5000 | 1.4818 | 2.250 | 2.224 | 1.503 | 1.489 | 1.697 | 1.500 | 0.87 | 0.433 | 0.039 | 0.070 | 0.060 | 0.332 | 0.052 | 0.050 | 0.2763 | 0.2760 | 1.6973 | 1.6970 | 3.500 | 0.83 |
| See Note. 15 | 5 | 4 | 6 | 7 | 3 | 9, 10 | ||||||||||||||||
Maximum Gaging Lengths (LG) For Flange 12-Point Screws
| Nominal Length | Nominal Size | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 | 1 | 1-1/8 | 1-1/4 | 1-3/8 | 1-1/2 | |
| 1-1/2 | 0.500 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1-3/4 | 0.500 | 0.625 | 0.500 | — | — | — | — | — | — | — | — | — | — | — |
| 2 | 1.000 | 0.625 | 0.500 | 0.625 | — | — | — | — | — | — | — | — | — | — |
| 2-1/4 | 1.000 | 1.125 | 1000 | 0.625 | 0.750 | 0.750 | — | — | — | — | — | — | — | — |
| 2-1/2 | 1.500 | 1.125 | 1.000 | 1.125 | 0.750 | 0.750 | 0.750 | -- | -- | -- | -- | -- | -- | -- |
| 2-3/4 | 1.625 | 1.500 | 1.125 | 1.625 | 0.750 | 0.750 | 0.750 | -- | -- | -- | -- | -- | -- | -- |
| 3 | 2.000 | 1.625 | 1.500 | 1.625 | 1.500 | 1.500 | 0.750 | 1.000 | -- | -- | -- | -- | -- | -- |
| 3-1/4 | 2.000 | 2.125 | 2.000 | 1.625 | 1.500 | 1.500 | 1.500 | 1.000 | 1.000 | -- | -- | -- | -- | -- |
| 3-1/2 | 2.500 | 2.125 | 2.000 | 2.125 | 1.500 | 1.500 | 1.500 | 1.000 | 1.000 | 1.000 | — | — | — | — |
| 3-3/4 | 2.500 | 2.625 | 2.500 | 2.125 | 2.250 | 1.500 | 1.500 | 1.000 | 1.000 | 1.000 | 1.000 | — | — | — |
| 4 | 3.000 | 2.625 | 2.500 | 2.625 | 2.250 | 2.250 | 2.250 | 2.000 | 1.000 | 1.000 | 1.000 | 1.000 | — | — |
| 4-1/4 | 3.000 | 3.125 | 3.000 | 2.625 | 2.250 | 2.250 | 2.250 | 2.000 | 2.000 | 1.000 | 1.000 | 1.000 | 1.000 | — |
| 4-1/2 | 3.500 | 3.125 | 3.000 | 3.125 | 3.000 | 3.000 | 2.250 | 2.000 | 2.000 | 2.000 | 1.000 | 1.000 | 1.000 | 1.000 |
| 4-3/4 | 3.500 | 3.625 | 3.500 | 3.125 | 3.000 | 3.000 | 3.000 | 2.000 | 2.000 | 2.000 | 2.000 | 1.000 | 1.000 | 1.000 |
| 5 | 4.000 | 3.625 | 3.500 | 3.625 | 3.000 | 3.000 | 3.000 | 2.000 | 2.000 | 2.000 | 2.000 | 1.000 | 1.000 | 1.000 |
| 5-1/4 | — | 4.125 | 4.000 | 3.625 | 3.750 | 3.750 | 3.000 | 3.000 | 3.000 | 2.000 | 2.000 | 2.000 | 2.000 | 1.000 |
| 5-1/2 | — | 4.125 | 4.000 | 4.125 | 3.750 | 3.750 | 3.750 | 3.000 | 3.000 | 3.000 | 2.000 | 2.000 | 2.000 | 2.000 |
| 5-3/4 | — | 4.625 | 4.500 | 4.125 | 3.750 | 3.750 | 3.750 | 3.000 | 3.000 | 3.000 | 2.000 | 2.000 | 2.000 | 2.000 |
| 6 | — | 4.625 | 4.500 | 4.625 | 4.500 | 4.500 | 3.750 | 4.000 | 4.000 | 3.000 | 2.000 | 2.000 | 2.000 | 2.000 |
| 6-1/4 | — | 5.125 | 5.000 | 4.625 | 4.500 | 4.500 | 4.500 | 4.000 | 4.000 | 3.000 | 3.000 | 3.000 | 2.000 | 2.000 |
| 6-1/2 | — | 5.125 | 5.000 | 5.125 | 4.500 | 4.500 | 4.500 | 4.000 | 4.000 | 3.000 | 3.000 | 3.000 | 3.000 | 3.000 |
| 6-3/4 | — | — | 5.500 | 5.125 | 5.250 | 5.250 | 5.250 | 4.000 | 4.000 | 4.000 | 3.000 | 3.000 | 3.000 | 3.000 |
| 7 | — | — | 5.500 | 5.625 | 5.250 | 5.250 | 5.250 | 5.000 | 4.000 | 4.000 | 4.000 | 4.000 | 3.000 | 3.000 |
| 7-1/4 | — | — | 6.000 | 5.625 | 5.250 | 5.250 | 5.250 | 5.000 | 4.000 | 4.000 | 4.000 | 4.000 | 3.000 | 3.000 |
| 7-1/2 | — | — | — | 6.125 | 6.000 | 6.000 | 5.250 | 5.000 | 5.000 | 5.000 | 4.000 | 4.000 | 4.000 | 4.000 |
| 7-3/4 | — | — | — | 6.125 | 6.000 | 6.000 | 6.000 | 5.000 | 5.000 | 5.000 | 4.000 | 4.000 | 4.000 | 4.000 |
| 8 | — | — | — | 6.625 | 6.750 | 6.750 | 6.000 | 5.000 | 5.000 | 5.000 | 4.000 | 4.000 | 4.000 | 4.000 |
| 8-1/2 | — | — | — | 7.125 | 7.000 | 6.750 | 6.750 | 6.000 | 6.000 | 5.000 | 5.000 | 5.000 | 5.000 | 4.000 |
| 9 | -- | -- | -- | 7.625 | 7.000 | 7.750 | 6.750 | 7.000 | 6.000 | 6.000 | 6.000 | 5.000 | 5.000 | 5.000 |
| 9-1/2 | -- | -- | -- | -- | 8.000 | 7.750 | 7.750 | 7.000 | 7.000 | 7.000 | 6.000 | 6.000 | 5.000 | 5.000 |
| 10 | -- | -- | -- | -- | 8.000 | 9.25 | 7.750 | 8.000 | 7.000 | 7.000 | 7.000 | 6.000 | 6.000 | 5.000 |
| 11 | -- | -- | -- | -- | -- | 10.25 | 9.25 | 9.000 | 8.000 | 7.000 | 7.000 | 7.000 | 6.000 | 6.000 |
| 12 | — | — | — | — | — | — | 10.25 | 10.000 | 9.000 | 9.000 | 8.000 | 7.000 | 7.000 | 6.000 |
| 13 | — | — | — | — | — | — | — | 11.000 | 10.000 | 10.000 | 9.000 | 8.000 | 7.000 | 7.000 |
| 14 | — | — | — | — | — | — | — | 12.000 | 11.000 | 11.000 | 10.000 | 9.000 | 8.000 | 7.000 |
| 15 | — | — | — | — | — | — | — | 13.000 | 12.000 | 12.000 | 11.000 | 10.000 | 9.000 | 8.000 |
| 16 | — | — | — | — | — | — | — | — | 13.000 | 13.000 | 12.000 | 11.000 | 10.000 | 9.000 |
| 17 | — | — | — | — | — | — | — | — | 14.000 | 14.000 | 13.000 | 12.000 | 11.000 | 10.000 |
| 18 | — | — | — | — | — | — | — | — | 15.000 | 15.000 | 14.000 | 13.000 | 12.000 | 11.000 |
| 19 | — | — | — | — | — | — | — | — | 16.000 | 16.000 | 15.000 | 14.000 | 13.000 | 12.000 |
| 20 | — | — | — | — | — | — | — | — | 17.000 | 17.000 | 16.000 | 15.000 | 14.000 | 13.000 |
Dimensions
All dimensions are in inches unless otherwise stated
Top of Head
Top of head may be full form or indented at option of the manufacturer. If full form, the top of head shall be charmferd or rounded with the diameter of chamfer circle or start of rounding begin equal to the max width across flats, within a tolerance of minus 15 percent. If the top of head is indetend, the periphery may be rounded.
Corner Fill
The rounding due to lack of fill on all 12 corners of the head shall be reasonably uniform and the width across corners of the head shall be such that when a sharp ring having an inside diameter equal to the specified T dimension is placed on the top of the head and normal to the screw axis, the screw head amy enter, but not protrude through the gage.
Wrenching Height, J.
Wrenching height is a distance measured from the top of the flange up the side of the head to the top of the head.
True Position of Head
The axis of the head shall be located at true position with respect to the axis of the body (determined over a distance under the head equal to one diameter) within a tolerance zone whose diameter is equivalent to 6 percent of the maximum width across flats, regradeless of feature size.
Bearing Surface
Runout of the bearing surface with respect to the axis of the body shall be within the FIM limits specified. Measurement of FIM shall be made as close to the periphery of th bearing surface as possible while the screw is held in a colet or other gripping device at a distance of one screw diameter from the underside of the head.
Fillet
For all lengths of screwssss, the form of the fillet shall be optional: provided it is tanget to the shank of the screw at a distance no greater than La max from the underside of head; provided it fairs into the bearing surface within the limits of basic major diameter of threads plus M max, and E minplus M min; and is smooth and continuous curve having a bearing surface juncture radius no less than that specified in Table 1 for the respective screw size.
Threads
Threads, when rolled, shall be unified coarse or fine thread series UNRC or UNRF, Class 2A or 3A, in accordance with ANSI/ASME B1.1, page A-26. Threads produced by other means shall perferably be UNRC or UNRF, Class 2A or 3A, but at manufacturer's option may be Unified coarse of fine thread series UNC or UNF, Class 2A or 3A. Acceptability of screw threads shall be determined based on system 21, ANSI/ASME B1.3, page A-53.
Length of Thread
The Length of the thread (L1) shall be measured from the extreme point to the last complete thread. The Length of thread shall be controlled by max gaping length (Lg) specified in Table 2. On short screws (those for which no gaging length is hsown in the Table), the complete thread, as measured with a thread ring gage, shall extend to within two threads of the head for sizes up to 5/8 in, inclusive and shall extend as close to the head as practicable for sizes over 5/8 in. Min length of body (La, distance of underside of head to last scratch of thread) for all lengths tabulated in Table 2 shall be max gaging length minus max thread transition length (Y).
Long Screws.
Screws of longer lengths than those given in table 2, shall have min thread length equal to specified basic thread, and total thread length (including incomplete threads) shall not be exceed the basic thread length plus the max thread transition length.
Point
Point shall be flat and chamfered from approximately 0.016 in. below the minor diameter, the length of point to be from ½ to 1½ threads.
Length of screw, L.
The length of the screw shall be measured on a line parallel to the axis, from the placen of the bearing surface under the head, to the placne on the flat of the point. Tolreance on screw length shall be minus 0.031 in. for lengths up to and including 1 in; minus 0.047 in. for lengths over 1 in. to and including 2 in; minus 0.062 in. for lengths over 2 in. to and including 6 in; and minus 0.125 in. for all lenghts over 6 in.
Thread Runount and Screw Straightness.
The runout of the thread in relation to screw body and the shank straightness shall be such that the screw will meet the requirements given on page C-22
Material
Chemical and mechanical properties of steel screws normally confirm to Grades 2, 5 or 8 of SAE J429, page B-50. Properties of sveral gardes of nonferrous material are covered in ASTM F468, page B-100 and of several stainless steels in ASTM F593, page B-92.
Nominal Size
Where specifying nominal size in decimals, zero preceding decimal and in the fourth decimal place shall be omitted.