Cold heading Service

ASME B18.6.3 Slotted Hex Collar Self Tapping Screws

ASME B18.6.3 Slotted Hex Collar Self-Tapping Screws feature a hexagonal head, an integrated collar beneath the head, and a slotted drive. The hex head allows tightening with a wrench or socket, while the slot provides screwdriver access. The collar offers an enlarged bearing area beneath the head, making this design suitable for sheet metal fastening, brackets, and component assemblies where head support and secure tightening are required.

Our production process focuses on the dimensional accuracy of the hex head, collar, slot, and tapping thread. Cold heading forms the screw head and collar, while thread rolling produces the required thread profile. The slotted drive is machined to meet the specified dimensions. We also control material selection, heat treatment, and surface finish according to order requirements, with dimensional inspections to verify the finished screws.

ASME B18.6.3 Slotted Hex Collar Self Tapping Screw Stainless Steel

Specification:

Item	Specification
Standard	ASME B18.6.3
Product Type	Slotted Hex Collar Self Tapping Screws
Thread Diameter	#4-7/16"
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 Slotted Hex Collar Self Tapping Screw

Mon	#4	#5	#6	#7	#8	#10	#12	1/4	5/16	3/8	7/16
P	24	20	20	19	18	16	14	14	12	12	10
s max	0.188	0.188	0.25	0.25	0.25	0.312	0.312	0.375	0.5	0.562	0.625
s min	0.181	0.181	0.244	0.244	0.244	0.305	0.305	0.367	0.489	0.551	0.61
e min	0.202	0.202	0.272	0.272	0.272	0.34	0.34	0.409	0.545	0.614	0.682
k max	0.06	0.07	0.093	0.093	0.11	0.12	0.155	0.19	0.23	0.295	0.348
k min	0.049	0.058	0.08	0.08	0.096	0.105	0.139	0.172	0.208	0.27	0.321
dc max	0.243	0.26	0.328	0.328	0.348	0.414	0.432	0.52	0.676	0.78	0.87
dc min	0.225	0.24	0.302	0.302	0.322	0.384	0.398	0.48	0.624	0.72	0.79
h max	0.019	0.025	0.025	0.029	0.031	0.031	0.039	0.05	0.055	0.063	0.073
h min	0.011	0.015	0.015	0.017	0.019	0.019	0.022	0.03	0.035	0.037	0.043
n max	0.039	0.043	0.048	0.048	0.054	0.06	0.067	0.075	0.084	0.094	0.094
n min	0.031	0.035	0.039	0.039	0.045	0.05	0.056	0.064	0.072	0.081	0.081
t max	0.042	0.049	0.053	0.053	0.074	0.08	0.103	0.111	0.134	0.168	0.175
t min	0.025	0.03	0.033	0.033	0.052	0.057	0.077	0.083	0.1	0.131	0.14
d max	0.114	0.13	0.139	0.154	0.166	0.189	0.215	0.246	0.315	0.38	0.44
d min	0.108	0.123	0.132	0.147	0.159	0.182	0.208	0.237	0.306	0.371	0.429
d1 max	0.086	0.094	0.104	0.115	0.122	0.141	0.164	0.192	0.244	0.309	0.359
d1 min	0.082	0.09	0.099	0.109	0.116	0.135	0.157	0.185	0.236	0.299	0.349

Mechanical Property:

Slotted hex collar self-tapping screws are designed to withstand installation forces while maintaining the integrity of the hex head, collar, slotted drive, and tapping thread. The hex head allows tightening with a wrench, while the slot provides screwdriver access. The collar provides a bearing surface beneath the head, and the tapping thread must resist deformation as it forms a mating thread in the workpiece.

Carbon Steel SAE J933– ASME B18.6.3 Slotted Hex Collar Self Tapping Screws

For applicable carbon steel tapping screws, SAE J933 covers mechanical and quality requirements, including performance during installation. Torsional strength is important for preventing screw breakage as the tapping thread forms or cuts a mating thread. The required performance depends on the screw type and size.

Stainless Steel ISO3506-4– ASME B18.6.3 Slotted Hex Collar Self Tapping Screws

For stainless steel versions, mechanical performance depends on the selected stainless steel grade and the product requirements. Torsional strength and thread integrity are important for installation, while ASME B18.6.3 provides the applicable dimensional requirements for the specified screw design.

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