Round Washer Head Self Drilling Lath Screws

Diagram of Phillips Wafer Head Self-Drilling Screws with labeled head, thread, and point dimensions.

(mm)	ST3.5	ST4.2	ST4.8
P	1.3	1.4	1.6
dc min	6.73	7.77	8.94
dc max	6.86	8.18	9.53
da min	4.06	4.57	4.83
da max	4.32	4.83	5.21
r min	0.25	0.25	0.38
r max	0.51	0.51	0.89
k min	1.39	1.65	1.52
k max	1.65	1.9	2.03
M	4.2	4.6	5
No.	2	2	2
t min	1.27	1.27	1.9
t max	1.88	1.9	2.67
d min	3.43	4.09	4.65
d max	3.53	4.22	4.8
d1 min	2.51	2.95	3.43
d1 max	2.64	3.1	3.58
z	7	8	10

Key Features:

Versatile Sizes: Available in various dimensions (ST3.5, ST4.2, ST4.8) to cater to different construction and installation needs.
Enhanced Performance: Self-drilling design eliminates the need for pre-drilling, allowing for quick and efficient installation.
Durable Construction: Engineered with high-quality materials, these screws provide excellent strength and resistance to wear, ensuring long-lasting performance.
Optimized Thread Design: Features a round washer head and optimized thread dimensions (dc min/max, da min/max) for superior grip and stability.
Wide Range of Specifications: Includes detailed specifications for minimum and maximum diameter, thread depth, and other critical measurements, ensuring compatibility with various applications.
User-Friendly: Designed for ease of use, making them suitable for both professional contractors and DIY enthusiasts.
Reliable Load Capacity: Capable of supporting various loads with specified k min/max values, ensuring safety and reliability in construction projects.
Quality Assurance: Manufactured under strict quality control standards, providing confidence in product performance and safety.