I. Product Overview

Our factory specializes in precision CNC turning and rolling grooving galvanized hollow sleeve (metal bushing) processing. It adopts an integrated cutting and forming hollow cylinder structure with metal tube material, without the need for splicing and welding, ensuring overall stability and firmness. The middle section of the sleeve is processed with a straight line rolling groove texture, significantly enhancing the assembly bite friction. After installation and pressure fitting, it is not easy to rotate, slip, or loosen. The entire sleeve has been heat galvanized for corrosion resistance, with smooth and flat inner and outer tube walls, free of burrs and edges. The size tolerance is strictly controlled, and the interchangeability is excellent.
Customizable to meet customer requirements, we can freely change raw materials, adjust exterior dimensions, and modify surface anti-corrosion processes to fit various industry assembly needs. We support non-standard customization of drawings and samples, offering both small-batch sample production and handling large-scale stable supply for foreign trade. The entire production and quality inspection process adheres to ISO9001:2015 quality standards.

Part II: Product Craftsmanship and Technological Advantages

1. Tubular material integrated turning and forming, hollow structure regular and stable
   Seamless tube material is processed by an overall CNC lathe, featuring concentricity of the inner and outer circles of the cylinder, even wall thickness, flat and perpendicular ends, tight assembly fit, no deformation or eccentricity issues; hollow design achieves lightweighting while saving material costs.
2. Central straight embossed seamless processing, strong anti-slip locking effect
   The middle section of the cylinder body features precise straight-line grooves with even depth. After being pressed into plastic, shell, and metal holes, the grooves firmly grip the inner wall, effectively preventing rotation and axial loosening during use, ensuring stable tightness over a long period.
3. Full surface galvanized anti-rust treatment, suitable for various environments
   The overall galvanized layer is dense and uniform, effectively blocking air and moisture, with excellent rust and oxidation resistance. It can be used for a long time in both indoor normal environments and slightly humid environments, and is not prone to rust and corrosion.
4. Inner and outer walls are smooth without burrs, assembly is smooth without damaging accessories.
   After turning and deburring finishing, the inner wall, outer circle, and ports are smooth and delicate. The insertion of wire materials and shaft assembly is smooth, without scratching the wire harness, shaft core, or mating shell workpieces.

Section 3: Optional Customizable Raw Materials

1. Low-carbon steel (mainly recommended in standard models)Medium hardness, easy to turn and roll, highest cost-performance, first choice for general fasteners and furniture hardware.
2. Stainless steelExcellent rust resistance, designed for damp, outdoor, and water-exposed environments, corrosion-resistant and durable
3. BrassGood electrical conductivity, wear-resistant and smooth, suitable for electrical wire grommets, conductive connectors.
4. Aluminum alloyLightweight, select internal positioning kits for lightweight equipment and instruments

4. Optional Surface Treatment Processes

• Blue and white galvanized: Basic anti-rust solution, bright appearance, moderate cost, mainstream process in the market.
• Color Coated Galvanized: Higher rust prevention level, longer resistance to salt spray, optimal for harsh humid environments
• Mirror polishing: Metal with high luster texture, high aesthetics, suitable for decorative hardware accessories.
• Tin-plated: Easy to weld, specially used for electronic electrical harness joints and conductive bushes.

Five, Main Application Scenarios

✅ Furniture Hardware: Table and chair connectors, cabinet pre-buried nut sleeves, furniture fastening locating bushes
✅ Mechanical parts: equipment locating bushes, shaft sleeves, shock absorbing separators, fixture inner pads
✅ Electrical harness accessories: harness protective connectors, terminal sleeve, electrical internal hollow connectors
Precision Instruments: Limiting bushes, guiding bushes, miniature positioning sleeve
✅ Fastener Sets: Expansion kits, pre-buried sockets, injection-molded embedded metal bushes
✅ Light Industry Equipment: Fitness Equipment, Bath Hardware, Small Equipment Fitting Sleeves

6. Core Product Advantages

1. Numerical control equipment for mass production, uniform dimensions with small tolerances, high assembly compatibility for large quantities.
2. Rolling flower anti-slip structure design, tight locking, low rework rate, reducing customers' post-maintenance costs.
3. Pipe diameter, total length, wall thickness, and the length of the knurling area can all be customized as required.
4. Material and surface process freely combined to meet various requirements of rust-proofing, wear resistance, conductivity, and lightweighting.
5. Factory inspection of appearance and dimensions per batch, stable quality, guaranteed delivery for foreign trade orders.

Chapter 7: Procurement Q&A

Q1: Can you replicate the processing based on the drawings or physical samples I provide?
A: Full support, accepts 1:1 CAD drawings and physical samples for production, with priority scheduling for small batch samples.
Q2: What is the minimum order quantity? How long is the lead time for samples and bulk orders?
A: A small quantity of samples is sufficient for production arrangement; the minimum order quantity for mass production can be flexibly negotiated. Sample cycle: 3-4 days, regular large-volume order: 7-10 days, urgent orders can shorten the production period.
Q3: Can the wall thickness, inner diameter, and knurling length be adjusted at will?
Inner diameter, outer diameter, wall thickness, total length of the sleeve, starting and ending lengths of the knurling area, and the density of the patterns can all be customized as required.
Q4: For outdoor humid environments, what surface treatment is recommended?
A: Prefer the color zinc electroplating process for its superior resistance to salt spray and corrosion compared to blue and white zinc, suitable for long-term outdoor and humid conditions.
Q5: Can the sleeve be made into a plain, non-embossed round tube?
A: Sure, smooth, straight-ribbed, and mesh-ribbed textures are all available for processing as required.