Knurled Insert Nuts & Sleeves Mechanical Assembly

TNHO knurled insert nuts and tube sleeves are designed for reliable mechanical assembly, positioning and connection. With precision knurled appearance, they achieve firm fitting, anti‑rotation and anti‑loosening in assembly. Tube sleeves protect inner parts, improve concentricity and extend service life. Made of brass, carbon steel or stainless steel, processed by cold heading, turning and knurling for high precision. Available in standard and custom sizes, compatible with electrical meters, power equipment, automotive components and industrial devices. Stable performance, easy installation and long‑term durability.

Product Parameters

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.

Features

1.Strong anti‑pull‑out design: The knurled/serrated outer surface forms a mechanical lock with plastic, preventing loosening under vibration and stress.
2.Multiple styles for diverse applications: Available in straight knurled, twisted knurled, step and hex configurations to suit different installation needs.
3.High‑quality material options: Made of corrosion‑resistant brass or durable steel, ensuring long service life in various environments.
4.Precision‑machined internal threads: Accurate thread tolerance ensures smooth bolt engagement and reliable fastening performance.
5.Suitable for multiple installation methods: Can be installed via injection molding, ultrasonic heat staking or press‑fit processes.

Advantages

Superior retention strength

The knurled surface creates a larger contact area with plastic, delivering excellent pull‑out and torque resistance.

Reduced assembly cost

Integrated thread inserts eliminate the need for tapping threads directly in plastic, saving time and labor.

Enhanced durability

Brass or steel inserts protect plastic parts from thread wear, repeated assembly damage and stripping.

Versatile application range

Compatible with most thermoplastics, widely used in electronics, appliances and automotive industries.

Strict quality control

Precision machining ensures consistent dimensions, thread quality and knurl pattern across every batch.

Customization support

We offer OEM/ODM services for custom thread sizes, lengths, knurl patterns and materials to meet specific project requirements.

Details

Certificate

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