IFI 111 Hex Flange Screws

IFI 111

Dimensions for Hex Flange Screws

Nominal Size or Basic Major Dia of Thread E F G B K H H1 R2 A
Body Dia Width Across Flats Width Across Corners Flange Dia Flange Thickness Head Height Hex Height Flange Top Radius Gaging Ring Thickness
Max Min Basic Max Min Max Min Max Min Max Min Max Max Min
¼ 0.2500 0.2500 0.2450 3/8 0.3750 0.367 0.433 0.409 0.56 0.04 0.28 0.17 0.015 0.0514 0.0511
5⁄16 0.3125 0.3125 0.3065 1/2 0.5000 0.489 0.577 0.548 0.68 0.05 0.32 0.21 0.019 0.0643 0.0640
⅜ 0.3750 0.3750 0.3690 9/16 0.5625 0.551 0.650 0.618 0.081 0.06 0.39 0.25 0.022 0.0771 0.0768
7⁄16 0.4375 0.4375 0.4305 5/8 0.6250 0.612 0.722 0.685 0.93 0.07 0.46 0.30 0.026 0.0900 0.0897
½ 0.5000 0.5000 0.4930 3/4 0.7500 0.736 0.866 0.825 1.07 0.08 0.51 0.34 0.030 0.1029 0.1026
9⁄16 0.5625 0.5625 0.5545 13⁄16 0.8125 0.798 0.938 0.895 1.19 0.09 0.57 0.38 0.034 0.1157 0.1154
⅝ 0.6250 0.6250 0.6170 15⁄16 0.9375 0.922 1.083 1.034 1.33 0.10 0.62 0.42 0.036 0.1286 0.1283
¾ 0.7500 0.7500 0.7410 1-⅛ 1.1250 1.100 1.299 1.234 1.59 0.11 0.73 0.51 0.045 0.1543 0.1540
See Para. 23 18 5 8 4 8 5
Nominal Size or Basic Major Dia of Thread T B1 Runout of Bearing Surface FIM Lr Y
Gaging Ring Dia Bearing Dia Thread Length Transition Thread Length
For Screws with L ≤ 6 in. For Screws with L > 6 in. For Screws with L ≤ 6 in. For Screws with L > 6 in.
Max Min Min Max Basic Max Max
¼ 0.2500 0.4093 0.4090 0.48 0.010 0.750 1.000 0.400 0.650
5⁄16 0.3125 0.5483 0.5480 0.60 0.011 0.875 1.125 0.417 0.667
⅜ 0.3750 0.6183 0.6180 0.73 0.012 1.000 1.250 0.438 0.688
7⁄16 0.4375 0.6853 0.6850 0.85 0.013 1.125 1.375 0.464 0.714
½ 0.5000 0.8253 0.8250 0.98 0.014 1.250 1.500 0.481 0.731
9⁄16 0.5625 0.8953 0.8950 1.10 0.015 1.375 1.625 0.750 0.750
⅝ 0.6250 1.0343 1.0340 1.26 0.017 1.500 1.750 0.773 0.773
¾ 0.7500 1.2343 1.2340 1.47 0.020 1.750 2.000 0.800 0.800
See Para. 23 5 9 7 12 15

IFI 111 Underhead Fillet for Long Screws

Dimensions of Underhead Style 1 and Style 2 Fillets

Nominal Size or Basic Product Dia Long Screws
(Fig.2)		 Long and Short Screws Short Screw1
(FIg.3)
Ea La R1 Ea E1a Lf
Fillet Transition Dia Fillet Length Radius of Fillet Filler Transition Dia Fillet Length
Max Min Max Min Max Max Max Max
¼ 0.2500 0.300 0.280 0.087 0.025 0.015 0.300 0.236 0.043
5⁄16 0.3125 0.362 0.342 0.087 0.025 0.015 0.362 0.300 0.045
⅜ 0.3750 0.425 0.405 0.087 0.025 0.015 0.425 0.357 0.048
7⁄16 0.4375 0.488 0.468 0.087 0.025 0.015 0.488 0.416 0.052
½ 0.5000 0.550 0.530 0.087 0.025 0.015 0.550 0.477 0.053
9⁄16 0.5625 0.652 0.602 0.157 0.045 0.020 0.652 0.527 0.075
⅝ 0.6250 0.715 0.665 0.157 0.045 0.020 0.715 0.587 0.078
¾ 0.7500 0.840 0.790 0.157 0.045 0.020 0.840 0.709 0.081

Note: Short screw are screws which are threaded full length.

IFI 111 Underhead Fillet for Short Screws Threaded Full Length

LG Maximum and LB Minimum Limitations for Short Screws Threaded Full Length

Nominal Size or Basic Product Dia For Nominal Produc Lengths LG
Max		 For Nominal Product Lengths LG
Max		 LB
Min
Less Than or Equal to All Thread Series Greater Than Less Than or Equal to All Thread Series All Thread Series
¼ 0.500 0.075 0.500 1.250 0.162 0.087
5⁄16 0.625 0.083 0.625 1.375 0.170 0.087
⅜ 0.750 0.094 0.750 1.500 0.181 0.087
7⁄16 0.875 0.107 0.875 1.750 0.194 0.087
½ 1.000 0.115 1.000 1.875 0.202 0.087
9⁄16 1.125 0.125 1.125 2.250 0.282 0.157
⅝ 1.250 0.136 1.250 2.500 0.293 0.157
¾ 1.500 0.150 1.500 2.750 0.307 0.157
See Notes 1 2 4 3 5

Note:
1. Tabulated values are equal to 2 times the basic product diameter.
2. Tabulated values are equal to 1.5 times the coarse thread (UNC) pitch.
3. Lmax equals fillet length, La max, as given in table 2 + 1.5 times the coarse thread (UNC) pitch.
4.Nominal product length,max, equals 2.5 times the coarse thread (UNC) pitch +Y+Lr rounded down to the next 0.250 or 0.125 length increment.

5. LB min in Table 3 equals La max in Table 2.

IFI 111 Underhead Fillet

Dimensions of Type 3 Underhead Fillet

Nominal Size or Basic Product Dia Ea EV Lf R3 V
Undercut Dia Fillet Dia Fillet Length Undercut Radius Underut Depth
Max Max Max Min Max Min
¼ 0.2500 0.325 0.275 0.058 0.010 0.010 0.004
5⁄16 0.3125 0.406 0.344 0.072 0.013 0.013 0.004
⅜ 0.3750 0.488 0.413 0.086 0.015 0.015 0.005
7⁄16 0.4375 0.569 0.481 0.101 0.018 0.018 0.006
½ 0.5000 0.650 0.550 0.115 0.020 0.020 0.007
9⁄16 0.5625 0.731 0.619 0.129 0.023 0.023 0.008
⅝ 0.6250 0.813 0.688 0.144 0.025 0.025 0.009
¾ 0.7500 0.975 0.825 0.173 0.030 0.030 0.011

Maximum Grip Gaging Lengths, LG, and Minimum Body Lengths, LB

Nom Dia 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4
Nom Lengths LB
Min		 LG
Max		 LB
Min		 LG
Max		 LB
Min		 LG
Max		 LB
Min		 LG
Max		 LB
Min		 LG
Max		 LB
Min		 LG
Max		 LB
Min		 LG
Max		 LB
Min		 LG
Max
1-1/4
1-3/8 0.225 0.625
1-1/2 0.350 0.750 0.208 0.625
1-5/8 0.475 0.875 0.333 0.750 0.187 0.625
1-3/4 0.600 1.000 0.458 0.875 0.312 0.750
1-7/8 0.725 1.125 0.583 1.000 0.437 0.875 0.286 0.750
2 0.850 1.250 0.708 1.125 0.562 1.000 0.411 0.875 0.269 0.750
2-1/8 0.975 1.375 0.833 1.250 0.687 1.125 0.536 1.000 0.394 0.875
2-1/4 1.100 1.500 0.958 1.375 0.812 1.250 0.661 1.125 0.519 1.000
2-3/8 1.225 1.625 1.083 1.500 0.937 1.375 0.786 1.250 0.644 1.125 0.250 1.000
2-1/2 1.350 1.750 1.208 1.625 1.062 1.500 0.911 1.375 0.769 1.250 0.375 1.125
2-5/8 1.475 1.875 1.333 1.750 1.187 1.625 1.036 1.500 0.894 1.375 0.500 1.250 0.352 1.125
2-3/4 1.600 2.000 1.458 1.875 1.312 1.750 1.161 1.625 1.019 1.500 0.625 1.375 0.477 1.250
2-7/8 1.725 2.125 1.583 2.000 1.437 1.875 1.286 1.750 1.144 1.625 0.750 1.500 0.602 1.375 0.325 1.125
3 1.850 2.250 1.708 2.125 1.562 2.000 1.411 1.875 1.269 1.750 0.875 1.625 0.727 1.500 0.450 1.250
3-1/4 2.100 2.500 1.958 2.375 1.812 2.250 1.661 2.125 1.519 2.000 1.125 1.875 0.977 1.750 0.700 1.500
3-1/2 2.350 2.750 2.208 2.625 2.062 2.500 1.911 2.375 1.769 2.250 1.375 2.125 1.227 2.000 0.950 1.750
3-3/4 2.600 3.000 2.458 2.875 2.312 2.750 2.161 2.625 2.019 2.500 1.625 2.375 1.477 2.250 1.200 2.000
4 2.850 3.250 2.708 3.125 2.562 3.000 2.411 2.875 2.269 2.750 1.875 2.625 1.727 2.500 1.450 2.250
4-1/4 3.100 3.500 2.958 3.375 2.812 3.250 2.661 3.125 2.519 3.000 2.125 2.875 1.977 2.750 1.700 2.500
4-1/2 3.350 3.750 3.208 3.625 3.062 3.500 2.911 3.375 2.769 3.250 2.375 3.125 2.227 3.000 1.950 2.750
4-3/4 3.600 4.000 3.458 3.875 3.312 3.750 3.161 3.625 3.019 3.500 2.625 3.375 2.477 3.250 2.200 3.000
5 3.850 4.250 3.708 4.125 3.562 4.000 3.411 3.875 3.269 3.750 2.875 3.625 2.727 3.500 2.450 3.250
5-1/4 4.100 4.500 3.958 4.375 3.812 4.250 3.661 4.125 3.519 4.000 3.125 3.875 2.977 3.750 2.700 3.500
5-1/2 4.350 4.750 4.208 4.625 4.062 4.500 3.911 4.375 3.769 4.250 3.375 4.125 3.227 4.000 2.950 3.750
5-3/4 4.600 5.000 4.458 4.875 4.312 4.750 4.161 4.625 4.019 4.500 3.625 4.375 3.477 4.250 3.200 4.000
6 4.850 5.250 4.708 5.125 4.562 5.000 4.411 4.875 4.269 4.750 3.875 4.625 3.727 4.500 3.450 4.250
6-1/4 4.600 5.250 4.458 5.125 4.312 5.000 4.161 4.875 4.019 4.750 3.875 4.625 3.727 4.500 3.450 4.250
6-1/2 4.850 5.500 4.708 5.375 4.562 5.250 4.411 5.125 4.269 5.000 4.125 4.875 3.977 4.750 3.700 4.500
6-3/4 5.100 5.750 4.958 5.625 4.812 5.500 4.661 5.375 4.519 5.250 4.375 5.125 4.227 5.000 3.950 4.750

GENERAL NOTE: Screw lengths above thick black line are fully threaded. See Para. 13.