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SS Hex Head Self Tapping Screw

Selected Stainless Steel Hex Head Self Tapping Screw Type ASS Hex Head Self Tapping Screw
Stainless Steel Hex Head Self Tapping Screw Type ASS Hex Head Self Tapping Screw

Stainless steel self-tapping screws are fasteners that have a tapered point allowing the screw to thread itself into a pre-drilled hole, though some softer materials may not require pre-drilling. Type A self-tapping screws have coarse threads suitable for use in thin metal, composites, and wood in many cases. The threads taper down to the point, allowing the screw to form threads into the material as the screw is installed. Type A screws are often referred to as sheet metal screws, though they are not a self-drilling tek screw. The hex washer head is less prone to stripping than some other drive types, and has an attached washer style flange under the head which creates a larger surface connection area. Hex washer head type A self-tapping screws listed here are available in 18-8 stainless steel for superior corrosion resistance when compared to steel screws. 

Products

Dimensional Specifications

Type A Threads for Self Tapping Screws dimensions
ASME B18.6.3-2013
Nominal Size
or Basic Screw
Diameter		 Threads
per Inch		 D d Drill
Size		 Recommended
Hole Diameter
Major
Diameter		 Minor
Diameter
Max Min Max Min
#0 0.060 40 0.060 0.057 0.042 0.039    
#1 0.073 32 0.075 0.072 0.051 0.048    
#2 0.086 32 0.088 0.084 0.061 0.056 #48 0.0760
#3 0.099 28 0.101 0.097 0.076 0.071 #46 0.0810
#4 0.112 24 0.114 0.110 0.083 0.078 #44 0.0860
#5 0.125 20 0.130 0.126 0.095 0.090 #36 0.1065
#6 0.138 18 0.141 0.136 0.102 0.096 #32 0.1160
#7 0.151 16 0.158 0.152 0.114 0.108 #30 0.1285
#8 0.164 15 0.168 0.162 0.123 0.116 #29 0.1360
#10 0.190 12 0.194 0.188 0.133 0.126 #21 0.1590
#12 0.216 11 0.221 0.215 0.162 0.155 3/16 0.1875
#14 0.242 10 0.254 0.248 0.185 0.178 7/32 0.2165
  1. Tolerance on Length: Up to 1" incl.: +/- 0.03. Over 1": +/- 0.05.
  2. All dimensions are in inches.
Type A Threads for Self Tapping Screws dimensions
ASME B18.6.3-2013
Nominal
Size		 A W H F U J T
Width
Across Flats		 Width
Across
Corners		 Height of
Head		 Diameter
of Washer		 Thickness
of Washer		 Width
of Slot		 Depth
of Slot
Max Min Min Max Min Max Min Max Min Max Min Max Min
#4 0.188 0.181 0.202 0.060 0.049 0.243 0.225 0.019 0.011 0.039 0.031 0.036 0.025
#6 0.250 0.244 0.272 0.093 0.080 0.328 0.302 0.025 0.015 0.048 0.039 0.046 0.033
#7 0.250 0.244 0.272 0.093 0.080 0.328 0.302 0.029 0.017 0.080 0.039 0.054 0.040
#8 0.250 0.244 0.272 0.110 0.096 0.348 0.322 0.031 0.019 0.054 0.045 0.066 0.052
#10 0.312 0.305 0.340 0.120 0.105 0.414 0.384 0.031 0.019 0.060 0.050 0.072 0.057
#12 0.312 0.305 0.340 0.155 0.139 0.432 0.398 0.039 0.022 0.067 0.056 0.093 0.077
#14 0.375 0.367 0.409 0.190 0.172 0.520 0.480 0.050 0.030 0.075 0.064 0.101 0.083
1/4 0.375 0.367 0.409 0.190 0.172 0.520 0.480 0.050 0.030 0.075 0.064 0.101 0.083
5/16 0.500 0.489 0.545 0.230 0.208 0.676 0.624 0.055 0.035 0.084 0.072 0.122 0.100
3/8 0.562 0.551 0.614 0.295 0.270 0.780 0.720 0.063 0.037 0.094 0.081 0.156 0.131
1/2* 0.750 0.735 0.820 0.400 0.367 1.040 0.960 0.085 0.050 0.106 0.091 0.190 0.165
  1. *Slot dimensions for 1/2-inch diameter hex washer head tapping screws are independent of ASME B18.6.3.
  2. All dimensions are in inches.