ASME B18.6.3 Phillips Oval Countersunk Head Tapping Screw

ASME B18.6.3 Phillips Oval Countersunk Head Tapping Screws are often selected when a fastener needs to provide both a secure connection and a finished appearance. Their rounded, raised heads create a softer profile than flat countersunk heads, while the Phillips recess allows installation with a matching cross-head driver. The tapping thread is designed to form mating threads in suitable materials, making this screw a practical option for sheet metal components, enclosures, and assemblies with visible fastening points.

At Ningbo Teng Qi Fasteners, we focus on matching each order to its specified dimensions, material, and performance requirements. Our production network includes facilities equipped with cold heading and thread rolling machines, allowing us to coordinate head forming and thread production for different screw specifications. We pay particular attention to head dimensions, recess consistency, thread accuracy, and heat-treated hardness. Material grades and surface finishes are also checked against order requirements, with quality controls supported by our ISO 9001-certified management system.

ASME B18.6.3 Phillips Raised Countersunk Head Tapping Screw Stainless Steel

Specification:

Item	Specification
Standard	ASME B18.6.3
Product Type	Phillips Oval Countersunk Head Tapping Screw
Thread Diameter	#0-#12
Point Type	Type AB Pointed Tip
Material	Carbon Steel, Stainless Steel
Steel Property	SAE J933
Stainless Steel Property	ISO 3506-4
Surface Treatment	Black Oxidation,Zinc Plated,Bright Finish
Inspection	Dimensions,Thread,Hardness,Coating

Dimension Chart:

Drawing of ASME B18.6.3 Phillips Oval Countersunk Head Tapping Screw

Mon	#0	#1	#2	#3	#4	#5	#6	#7	#8	#10	#12
P	48	42	32	28	24	20	20	19	18	16	14
dk max	0.112	0.137	0.162	0.187	0.212	0.237	0.262	0.287	0.312	0.362	0.412
dk min	0.096	0.12	0.144	0.167	0.191	0.215	0.238	0.262	0.285	0.333	0.38
k	0.035	0.043	0.051	0.059	0.067	0.075	0.083	0.091	0.1	0.116	0.132
f	0.021	0.025	0.029	0.033	0.037	0.041	0.045	0.049	0.052	0.06	0.068
M	0.068	0.07	0.106	0.118	0.13	0.152	0.172	0.176	0.186	0.202	0.264
No.	0	0	1	1	1	2	2	2	2	2	3
t max	0.038	0.041	0.062	0.074	0.087	0.074	0.094	0.1	0.108	0.126	0.135
t min	0.02	0.023	0.045	0.057	0.07	0.05	0.069	0.075	0.084	0.102	0.111
d max	0.06	0.075	0.088	0.101	0.114	0.13	0.139	0.154	0.166	0.189	0.215
d min	0.054	0.069	0.082	0.095	0.108	0.123	0.132	0.147	0.159	0.182	0.208
d1 max	0.036	0.049	0.064	0.075	0.086	0.094	0.104	0.115	0.122	0.141	0.164
d1 min	0.033	0.046	0.06	0.071	0.082	0.09	0.099	0.109	0.116	0.135	0.157

Mechanical Property:

ASME B18.6.3 Phillips Oval Countersunk Head Tapping Screws are designed with specific head and drive configurations for tapping applications. Their mechanical performance depends on the screw material, heat treatment, and applicable requirements for hardness and torsional strength.

SAE J933 – Carbon Steel Tapping Screws

For carbon steel Phillips oval countersunk head tapping screws manufactured to the applicable ASME B18.6.3 configuration, hardness and torsional strength are important factors in installation performance. The screw must withstand resistance as its threads engage with the workpiece without premature breakage. Material selection and heat treatment should be controlled to meet the applicable SAE J933 requirements.

ISO 3506-4 – Stainless Steel Tapping Screws

For stainless steel versions of ASME B18.6.3 Phillips oval countersunk head tapping screws, mechanical performance must be considered alongside corrosion resistance. The stainless steel grade and applicable property class influence the screw’s mechanical characteristics, including its ability to withstand installation stresses.

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