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18-8 SS Hex Head Tek Screw With Washer
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18-8 SS Hex Head Tek Screw With Washer

18-8 SS Hex Head Tek Screw With Washer

Hex head self drilling screws are fasteners that have a drill point which enables users to drill them directly into material without having to pre-drill a hole. EPDM washer under the head provides a consistent weather-tight seal. These fasteners are available in 18-8 stainless steel which is more corrosion resistant, but softer than 400 series stainless steels. Because these screws are made of of a softer, more corosion resistant stainless than standard 410 stainless tek screws, they are well suited for specialty applications such as cooling tower construction. 

Dimensional Specifications & Product Details#2 & #3 Standard Drill Point for Self Drilling Screws

#2 & #3 Standard Drill Point for Self Drilling Screws dimensions
SAE J78-2013
Nominal Size or
Basic Screw
Diameter		 Threads
per Inch		 T t P Minimum Practical Nominal Screw
Lengths, Formed Points		 Minimum
Torsional
Strength, lb - in
(STEEL SCREWS ONLY)
Major
Diameter		 Minor
Diameter		 Protrusion
Allowance
Max Min Max Min #2
Point		 #3
Point		 90° Head,
#2 Point		 Csk Head,
#2 Point		 90° Head,
#3 Point		 Csk Head,
#3 Point
#4 0.112 24 0.114 0.110 0.086 0.082 0.163 - 5/16 3/8 - - 14
#6 0.138 20 0.139 0.135 0.104 0.099 0.190 0.220 5/16 3/8 3/8 7/16 24
#8 0.164 18 0.166 0.161 0.122 0.116 0.211 0.251 3/8 7/16 7/16 1/2 42
#10 0.190 16 0.189 0.183 0.141 0.135 0.235 0.300 7/16 1/2 1/2 9/16 61
#12 0.216 14 0.215 0.209 0.164 0.157 0.283 0.353 1/2 5/8 1/2 5/8 92
#14 0.250 14 0.246 0.240 0.192 0.185 0.318 0.393 1/2 5/8 1/2 5/8 150
  1. All dimensions are in inches.
  Steel Stainless
Material AISI 1016 - 1024 or equivalent steel 410 or 18-8 stainless steel
Heat Treatment Screws shall be quenched in liquid and then
tempered by reheating to 625°F minimum.		 410 stainless steel screws shall be hardened
and tempered by heating to 1800°-1900°F
sufficient for austenitization, held for at least
1/2 hour and rapid air or oil-quenched then
reheating to 500°-600°F for at least 1 hour
and air cooled to provide the specified hardness.
Case Hardness Rockwell C52 - 58 410 SS: Rockwell C55 minimum
Case Depth No. 4 & 6 diameter: .002 - .007
No. 8 thru 12 diameter: .004 - .009
1/4 diameter & larger: .005 - .011		 -
Core Hardness Rockwell C32 - 40 (after tempering) 410 SS: Rockwell C38 - 42 (after tempering)
18-8 SS: Rockwell B90 - C25 (approx.)

Dimensional SpecificationsHex & Hex Washer Heads for Self-Tapping & Self-Drilling Screws

Hex & Hex Washer Heads for Self-Tapping & Self-Drilling Screws dimensions
ASME B18.6.3-2013
Nominal
Size		 A W H F U
Width
Across Flats		 Width
Across
Corners		 Height of
Head		 Diameter of
Washer		 Thickness of
Washer
Max Min 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
#6 0.250 0.244 0.272 0.093 0.080 0.328 0.302 0.025 0.015
#7 0.250 0.244 0.272 0.093 0.080 0.328 0.302 0.029 0.017
#8 0.250 0.244 0.272 0.110 0.096 0.348 0.322 0.031 0.019
#10 0.312 0.305 0.340 0.120 0.105 0.414 0.384 0.031 0.019
#12 0.312 0.305 0.340 0.155 0.139 0.432 0.398 0.039 0.022
#14 0.375 0.367 0.409 0.190 0.172 0.520 0.480 0.050 0.030
  1. All dimensions are in inches.

Dimensional Specifications & Product DetailsNeo-EPDM Washers Used With Self Drilling Screws

Neo-EPDM Washers Used With Self Drilling Screws dimensions
For Use
with
Screw of
this
Nominal
Diameter		 S N G C E
Outside
Diameter of
Steel Section		 Inside
Diameter of
Steel Section		 Thickness
of Steel
Section		 Inside
Diameter of
EPDM Section		 Thickness of
EPDM Section
Max Min Max Min Ref Max Min Max Min
#8 0.507 0.491 0.212 0.196 0.031 0.149 0.126 0.087 0.070
#10 0.507 0.491 0.212 0.196 0.031 0.149 0.023 0.087 0.070
#12 0.558 0.542 0.243 0.227 0.031 0.197 0.172 0.087 0.070
#14 0.617 0.601 0.275 0.259 0.031 0.232 0.208 0.087 0.070
  1. NOTE: There is no single standard for Neo-EPDM dimensions. These values are offered as a guide; deviations from these specifications may occur.
  2. All dimensions are in inches.
Material Steel Section of Washer: 20 gauge steel
Elastic Section of Washer: Style 40 EPDM sheet
Hardness EPDM Material: Shore A 65 - 75 (Durometer scale)
Plating Steel Section of Washer: Galvanized
Narrow Results

Length

18-8 SS Hex Head Tek Screw With Washer
View
Diameter Thread Pitch Length Tek Type Item # Availability Price Quantity UOM
#12 14 1 1/2 #3 DWHS 120150S4 In Stock $0.39694/EA EA
#12 14 2 #3 DWHS 120200S4 In Stock $0.37119/EA EA