14 X 7/8 HEX WASHER HEAD STITCH SCREW, COATED

Name: 14 X 7/8 HEX WASHER HEAD STITCH SCREW, COATED
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#2 & #3 Standard Drill Point Self Drilling Screws

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

	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.)

Diameter & Thread Pitch	Point Size	T		t		A		B		Drilling Capacity		Performance Info (STEEL SCREWS ONLY)
		Major Thread Diameter		Minor Thread Diameter		Drill Point Length		Drill Point Diameter		Drilling Capacity		Steel Gauge	Shear Strength (lapped steel) (lbs)	Pullout Strength (lbs)
		Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Steel Gauge	Shear Strength (lapped steel) (lbs)	Pullout Strength (lbs)
10-24	#5	0.189	0.181	0.162	0.158	0.413	0.373	0.173	0.165	0.250	0.125	-	-	-
12-24	#4	0.216	0.207	0.172	0.168	0.523	0.495	0.202	0.190	0.312	0.145	12	2000	1500
12-24	#5	0.216	0.207	0.172	0.168	0.640	0.603	0.202	0.190	0.500	0.250	1/8	2700	2200
12-24	#5	0.216	0.207	0.172	0.168	0.640	0.603	0.202	0.190	0.500	0.250	1/4	2760	4000
1/4-20	#4	0.246	0.239	0.192	0.185	0.511	0.471	0.227	0.215	0.312	0.145	12	1800	-
1/4-20	#5	0.249	0.242	0.192	0.185	0.629	0.569	0.227	0.222	0.500	0.250	12	1800	-

	Steel	Stainless
Material	AISI 1022 or equivalent steel	410 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. 10 & 12 diameter: .004 - .009 1/4 diameter & larger: .005 - .011	-
Core Hardness	Rockwell C21 - 43 (after tempering)	Rockwell C38 - 42 (after tempering)
Shear Strength	The average ultimate values for shear strength are listed in the above table. Safety factors should be used when designing final applications.	-
Pullout Strength	The average ultimate values for pullout strength are listed in the above table. Safety factors should be used when designing final applications.	-