I. Product Overview

This stepped cylindrical connecting rod is made by a CNC turning machine, with the body and top limit step machined as a whole, without any splicing or welding. The workpiece has high coaxiality and precise outer diameter, which can form a good sliding fit with the matching sleeve; the top step serves as an axial limit, preventing over insertion, and ensuring stable and reliable assembly positioning.
Carbon steel, stainless steel, brass, and aluminum alloys are available in various materials. Length, diameter, and limit step dimensions can be customized according to customer drawings or physical samples. Both small batch trial orders and large volume stable supply are acceptable. Strict dimensional inspections are conducted upon product dispatch.

Part Two: Core Highlights of Craftsmanship

1. Solid rod material, integrated CNC turning and shaping, excellent concentricity
   The whole part is machined in one operation, with high coaxiality between the cylindrical surface and the head step, ensuring smooth sliding without jamming or deviation, thus guaranteeing the precision of the equipment operation.
2. Step-limited positioning structure, precise control of insertion stroke
   Integrated positioning boss, automatically limits insertion depth during assembly, uniform batch assembly dimensions, reduces manual debugging errors.
3. External cylindrical precision turning, smooth sliding and wear-resistant
   Cylindrical working surface is finely turned to remove burrs, with a smooth surface; the steel material can be heat treated to enhance surface hardness, making it resistant to wear during long-term reciprocating sliding.
4. End face is smooth and regular, assembly is tight and fit.
   Both ends are flat and perpendicular, fitting with accessories without gaps, evenly distributing stress, and resistant to deformation over long-term use.

Section 3: Optional Customized Raw Materials

1. 45# Carbon Steel (Recommended)
   Quenchable to enhance hardness, excellent wear resistance, first choice for tooling and machine locating pins.
2. 304 Stainless Steel
   Anti-corrosive and rust-resistant, suitable for use in damp environments and outdoor equipment.
3. H62 Brass
   Self-lubricating, suitable for low-load sliding applications, and meets conductive requirements.
4. Aluminum alloy
   Lightweight, non-bearing locating connection for light instruments.

4. Optional Surface Treatment Processes

• Quenching blackening: Enhance hardness, wear resistance and rust prevention, mainstream solution for mechanical shafts
• Nickel Plating: Rust and wear resistance, clean appearance, precision instrument accessories
• Galvanized: Economical rust prevention, suitable for indoor general assembly parts
• Original color precision turning: Internal assembly, no electroplating required

Five, Applicable Application Scenarios

✅ Automatic machining fixture guide pin shaft
✅ Internal sliding connecting rod of the testing instrument
✅ Limiting connection posts for various electrical module components
✅ Small mold guide pin, limit component
✅ Light industry equipment, fitness equipment sliding connection accessories

Six, Core Product Advantages

1. Numerical control precision machining, flexible customization of outer diameter, length, and step sizes
2. High-intensity one-piece structure, resistant to lateral forces and easy to bend.
3. Quenching and hardening treatment can be selected according to working conditions, significantly enhancing service life.
4. A combination of various materials and surface processes, balancing wear resistance, rust prevention, and lightweight requirements.
5. Single piece sampling available, stable delivery time, supports long-term supply matching

Chapter 7: Common Procurement FAQ Q&A

Q1: Can the outer diameter tolerance of the connecting rod be matched according to the actual matching sleeve size?
A: Sure, adjust the clearance tolerance according to customer requirements to achieve tight fit, transition fit, and sliding fit effects.
Q2: What material treatment method is recommended for abrasion resistance?
A: 45# steel + quenched and blackened treatment, high hardness and optimal wear resistance.
Q3: Can the rod head be modified to a round head, pointed head, or slotted style?
A: Support, the head shape can be processed as required, round head, flat position, and grooved can all be turned into one piece.
Q4: Can the corresponding sleeve be processed as a complete set with the tube?
A: Support, the connecting rod and matching sleeve can be processed synchronously to ensure mating accuracy.