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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.

Products
Drill Point Specifications
Head Dimensions
Washer Dimensions

Drill Point Specifications

#2 & #3 Standard Drill Point 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		Minimum Practical Nominal Screw Lengths, Formed Points
			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

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.)

Washer Dimensions

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

NOTE: There is no single standard for Neo-EPDM dimensions. These values are offered as a guide; deviations from these specifications may occur.
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

18-8 SS Hex Head Tek Screw With Washer

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Diameter	Thread Pitch	Length	Tek Type	Item #	Availability	Price	Quantity	UOM
#12	14	1 1/2	#3	DWHS 120150S4	In Stock	$0.42215/EA	EA		EA
#12	14	2	#3	DWHS 120200S4	In Stock	$0.37119/EA	EA		EA

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

18-8 SS Hex Head Tek Screw With Washer

Technical Data

Drill Point Specifications

#2 & #3 Standard Drill Point Self Drilling Screws

Head Dimensions

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

Washer Dimensions

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

Length