Hebei Wotu Fastener Manufacturing Co., Ltd., founded in the 1990s, is located in Yongnian District, Handan City, Hebei Province, known as the “Hometown of Fasteners.”
1. Core Hardness: Standard: HRC32-40. Our products are measured at HRC31.7-39.0.
2. Surface Hardness: Standard: HV600-700. Our products are measured at approximately HV620.
3. Hardened Layer: 4#-6#: 0.05-0.18mm; 8#-12#: 0.10-0.23mm; 14#: 0.15-0.28mm.
4. Torque: Specifications, self-drilling screw, bolt.
Hebei Wotu Fastener Manufacturing Co., Ltd., founded in the 1990s, is located in Yongnian District, Handan City, Hebei Province, known as the “Hometown of Fasteners.” Our company specializes in producing self-drilling screws, hexagonal self-drilling screws, tower bolts, anti-theft bolts, GB30 bolts, anti-theft nuts, foot bolts, U-bolts, electrified railway bolts, nuts, bolt pins, and various electrical fittings. We stock various hot-dip galvanized bolts, nuts, flat washers, and spring washers, and can customize various non-standard parts. We can also help customers arrange sourcing and shipping. Our factory can undertake various external processing and heat treatment work, including hot-dip galvanizing and electro-galvanizing, as well as surface treatment work such as phosphating, drawing, annealing, and tempering. We are serious about self-drilling screws, hot-dip galvanized bolts, and our products. If you have any needs, please feel free to contact us!
DIN 931-style half-thread and DIN 933-style full-thread hex bolts should not be selected from diameter and overall length alone. The practical choice depends on the joint stack, required grip, location of the thread transition, available nut engagement, mating hardware, material or property requirement, coating system and governing product specification. A half-thread bolt is not automatically […]
A bolt manufacturer should be evaluated against a defined joint, drawing and acceptance plan—not a product list or unit price alone. Buyers need to verify whether the supplier can manufacture the required geometry, control material and heat-treatment requirements where applicable, manage threads and coatings as one dimensional system, inspect critical characteristics, preserve batch traceability and […]
