Machinery's Handbook, 31st Edition
1776 MACHINE SCREWS AND NUTS Diameter of Body.— The diameter of machine screw bodies is not less than Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread. Cross-recessed trim head machine screws not threaded to the head have an 0.062 in. mini mum length shoulder under the head with diameter limits as specified in the dimensional tables in the standard. Designation.— Machine screws are designated by the following data in the sequence shown: Nominal size (number, fraction, or decimal equivalent); threads per inch; nomi - nal length (fraction or decimal equivalent); product name, including head type and driv - ing provision; header point, if desired; material; and protective finish, if required. For example: 1 ∕ 4 − 20 × 1 1 ∕ 4 Slotted Pan Head Machine Screw, Steel, Zinc Plated 6 − 32 × 3 ∕ 4 Type IA Cross Recessed Fillister Head Machine Screw, Brass Machine screw nuts are designated by the following data in the sequence shown: Nomi nal size (number, fraction, or decimal equivalent); threads per inch; product name; mate rial; and protective finish, if required. For example: 10 − 24 Hexagon Machine Screw Nut, Steel, Zinc Plated 0.138 − 32 Square Machine Screw Nut, Brass Table 2. American National Standard Slotted 100-Degree Flat Countersunk Head Machine Screws ANSI/ASME B18.6.3-2013
T
J
99 101
A
H
L
Head Height, H
Slot Width, J
Slot Depth, T
Nominal Size a or Basic Screw Dia.
Head Dia., A
Max.
Min. 0.035 0.055 0.080 0.095 0.118 0.142 0.165 0.188 0.235 0.282 0.329 0.437 0.550 0.662
Ref.
Max.
Min.
Max.
Min.
0000 0.0210 0.040 000 0.0340 0.060 00 0.0470 0.087 0 0.0600 0.112 1 0.0730 0.137 2 0.0860 0.162 3 0.0990 0.187 4 0.1120 0.212 6 0.1380 0.262 8 0.1640 0.312 10 0.1900 0.362
0.009 0.008 0.005 0.008 0.004 0.014 0.012 0.008 0.011 0.007 0.020 0.017 0.010 0.013 0.008 0.026 0.023 0.016 0.013 0.008 0.031 0.026 0.019 0.016 0.010 0.037 0.031 0.023 0.019 0.012 0.043 0.035 0.027 0.022 0.014 0.049 0.039 0.031 0.024 0.017 0.060 0.048 0.039 0.030 0.022 0.072 0.054 0.045 0.036 0.027 0.083 0.060 0.050 0.042 0.031 0.110 0.075 0.064 0.055 0.042 0.138 0.084 0.072 0.069 0.053
0.2500 0.477 0.3125 0.597 0.3750 0.717
1 ∕
4
5 ∕
16
3 ∕ 0.165 0.094 0.081 0.083 0.065 a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted. All dimensions are in inches. 8
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online