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18-8 SS Hex Washer Head Tek Screw

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. 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.

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Drill Point Specifications
Head 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.)

18-8 SS Hex Washer Head Tek Screw

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Diameter Thread Pitch Length Tek Type Item # Availability Price Quantity UOM

#12

1 1/2

DHHS 120150S4

In Stock

$0.21835/EA

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12 X 1 1/2 HEX WASHER HEAD #3 TEK, 18-8 SS

$0.21835/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.21835/EA
750	$0.20456/EA
2970	$0.18217/EA
13340	$0.12072/EA

#12

DHHS 120200S4

In Stock

$0.25006/EA

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12 X 2 HEX WASHER HEAD #3 TEK, 18-8 SS

$0.25006/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.25006/EA
500	$0.23426/EA
1990	$0.20863/EA
8920	$0.13825/EA

#12

DHHS 120300S4

In Stock

$0.68737/EA

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12 X 3 HEX WASHER HEAD #3 TEK, 18-8 SS

$0.68737/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.68737/EA
500	$0.64395/EA
1990	$0.57347/EA
8920	$0.38003/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 Washer Head Tek Screw

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

Length

12 X 1 1/2 HEX WASHER HEAD #3 TEK, 18-8 SS

12 X 2 HEX WASHER HEAD #3 TEK, 18-8 SS

12 X 3 HEX WASHER HEAD #3 TEK, 18-8 SS