Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of din931 carbon steel grade 4.8 with black plated hex bolt half thread in China. Welcome to buy bulk high quality din931 carbon steel grade 4.8 with black plated hex bolt half thread made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Drywall screws are not priced by quantity alone. Weight per piece has a direct effect on cost, especially for large orders. A small difference in screw weight can change the total tonnage and the final price.
Send us the details, drawing on my factory-floor experience, we can analyze your specific market conditions and store requirements to help you determine the most precise and appropriate pricing.e-no guesswork on weight.
Please specify:
01
- Diameter × length
- Head type (bugle head, countersunk, etc.)
02
- Thread type (fine or coarse)
- Coating (black phosphate, gray phosphate, zinc, etc.)
03
- Target weight per piece (g/pc)
- Order quantity
04
- Packaging (dimensions of the box/outer carton, package weight, and whether the logo style or color can be customized)
Support that Grows With Your Business
We don't quote every buyer the same price. A new distributor testing the market, a growing wholesaler building regular stock, and an established importer running full containers have different cost structures and different risks-so we price accordingly.
Entry level: small mixed orders and practical MOQs, so you can test sizes and coatings without tying up cash.
Growth stage: stable weekly/monthly supply, consistent weight per piece, and repeat-order pricing that protects your margin.
Volume stage: container and ton-based wholesale pricing, with packing and delivery planned around your sales cycle.
Consistent quality and clear specs mean fewer claims, fewer returns, and less after-sales work for you. Tell us your market, sizes, and order stage-we'll recommend the right spec and quote the wholesale price that fits where you are now.
Product Overview
The DIN931 Hex Bolt is manufactured from carbon steel Grade 4.8 with a black plated finish, featuring half thread design that provides a clear unthreaded shank for applications requiring shear strength and precise alignment. Standard dimensions strictly comply with DIN931 specifications, while custom sizes are available to accommodate diverse engineering requirements.
Manufacturing Process
Our production follows a precision-driven workflow:
- Wire drawing to achieve exact diameter consistency
- Cold heading to form the hex head and bolt blank under high pressure
- Thread rolling to create accurate, fatigue-resistant threads on the upper portion
- Black plating for uniform surface finish and corrosion resistance
- Final inspection to verify dimensional accuracy and thread quality
Quality Control & Facility Advantage
We operate under a strict quality management system, conducting tensile strength tests, hardness checks, and salt spray testing to ensure coating durability. Our facility spans over 8,000 square meters with substantial warehousing capacity, strategically located in the Handan, Hebei fastener industry cluster-China's largest fastener production hub. This location provides unparalleled access to raw materials, specialized labor, and an efficient logistics network.
Supply Chain Strength & Global Reach
As a factory specializing in bolt production, we benefit from a vertically integrated supply chain, enabling cost stability and competitive pricing. Our monthly shipment and order volume consistently exceed 300 tons, reflecting strong production capacity. Products are exported to markets worldwide, including Europe, North America, Southeast Asia, and the Middle East, meeting diverse international quality standards.
Custom Packaging & After-Sales Service
We offer custom packaging solutions-including private labeling, branded cartons, and palletized bulk packaging-tailored to customer specifications. Our after-sales process ensures full traceability and rapid response: any quality-related issues are addressed within 24 hours, with replacement or credit arrangements processed promptly to minimize operational disruption.
Custom Packaging&Private Label Available
Choose from bulk cartons, poly bags with branded labels, or retail-ready packaging. Minimum order quantities can be adjusted to support both small contractors and large-scale procurement needs.
We offer custom box/bags printing and labeling services to help you build your own product line.
FAQ
Hot Tags: din931 carbon steel grade 4.8 with black plated hex bolt half thread, China din931 carbon steel grade 4.8 with black plated hex bolt half thread manufacturers, suppliers, factory
