tianhong Customized High-quality multi-series hex socket bolts
High-quality multi-series bolts including carriage bolts, hex socket carriage bolts, hex socket cylinder head screws and torx cylinder head hollow...
TNHO Brand Knurled Inserts, are precision-manufactured with multiple materials, offering both standard and customized options. Their knurled surface enhances connection stability, and they are processed via precision technologies like cold heading, suitable for various industrial assembly needs. Corrosion-resistant, highly adaptable and easy to install, they serve as core fasteners for reliable metal-nonmetal connections, with fully customizable and custom-made solutions available.
As a core product of Zhejiang Tianhong Fastener Co., Ltd. under the TNHO brand, Knurled Inserts solve the common issue of slipping when tapping directly on plastic, wood and other substrates. Embedded via pre-embedding, cold pressing, hot melting or in-mold injection, their knurled surface boosts friction and biting force with the substrate to prevent loosening, forming effective internal threads for firm component assembly. Available in various head styles, thread specifications and surface treatments, they meet both standard and custom requirements—with fully customizable and custom-made options to fit specific needs—and are widely used in electric meters, electrical/electronic products, auto parts, renewable energy and other industries. With precise size control and stable mechanical properties, they ensure equipment assembly reliability, and some products are comparable to imported alternatives for high-end manufacturing.
| System of Measurement | Inch, Metric |
| Material | Stainless Steel, Carbon Steel, Steel, Brass, Iron, Aluminum |
| Thread Size | Metric: M1-M16; or customized |
| Head Type | Pan Head, Hex Head, Slotted Head, Torx Head, One-Way Head, Step Head, Flat Head, Large Head |
| Surface Finishing | Zinc Plating, Nickel Plating, Black Oxide, Dacromet |
| Production Process: | Cold Heading, Cold Forging，Cold Forming |
| Standard | ISO, JIS, GB, ANSI, BSW, DIN, Non-standard customized |
| Grade | 4.8, 6.8, 8.8, 12.9, etc |
| Brand | TNHO |
| Application | Electric Meter, Electrical, Electronic, Auto Parts, Renewable Energy Industry, etc. |
1.Superior Stability: Customizable knurled surfaces boost friction with the substrate, preventing loosening and eliminating tapping slipping, with better stability and pull-out resistance than ordinary inserts.
2.Diversified Material Options: Available in stainless steel, carbon steel, brass, etc., tailored to scenarios (corrosion resistance, cost-effectiveness) to meet diverse industrial needs.
3.Flexible Specifications & Customization: Supporting metric (M1-M16) and inch standards, with full head styles; fully customizable per customer drawings/samples for strong adaptability.
4.Precision & Reliable Craftsmanship: Advanced cold forming processes and precision testing ensure dimensional accuracy; surface treatments enhance corrosion resistance and service life.
5.Easy & Efficient Installation: Compatible with multiple installation methods, no complex tooling, enabling quick assembly and adapting to automated production.
Brand & Qualification
Founded in 1987, we have decades of experience with the reputable TNHO brand, ISO9001 certified and widely recognized as an excellent supplier.
Strong Production Capacity
Equipped with Taiwan-made precision equipment, we offer large-scale production and custom capabilities, with sufficient output to meet large and personalized orders.
Leading R&D
Our professional team with 25 patents develops inserts for emerging fields, with some products meeting or exceeding imported standards, serving well-known enterprises.
Supply Chain & Location
Based in Yueqing’s fastener zone, we ensure efficient procurement and delivery, with a global sales network and stable, short-cycle supply.
Strict Quality Control
Full-process inspection ensures dimensional accuracy and stable quality, preventing unqualified products and guaranteeing customer satisfaction.
Comprehensive Service
We provide one-stop services, including consultation, customization, sample delivery and after-sales support, with professional technical assistance.
