Hex 3-in-1 Pre-Assembled Bolt

Precision Die Forging Technology & Standardized Thread Forming Process

This Wanluo factory’s Hex 3-in-1 Pre-Assembled bolt is manufactured through professional die forging and integral forming technology. The outer hex head has precise dimensional tolerance, flat and smooth surface without burrs, ensuring full contact with the wrench sleeve for uniform force transmission and no slipping during high-torque operation. The bolt rod adopts secondary precision thread rolling process, with full and neat thread profile, uniform pitch and accurate meshing, perfectly matching standard threaded holes and nuts. After strict overall heat treatment, the bolt body achieves balanced hardness and toughness, resisting fracture, deformation and thread sliding under long-term heavy load. The matched flat and spring washers are fixed by high-pressure crimping process, ensuring no falling off or offset during transportation, screwing and long-term vibration. Multiple surface treatment options including electro galvanizing, color zinc plating and black passivation provide reliable anti-rust and anti-corrosion performance for industrial working conditions.

Product Parameter

Heavy Load-Bearing Performance & Engineering Structural Matching Advantages

1. Excellent high-torque heavy-load fastening capacity. The hex head provides larger stress area than inner hex and cross head screws, capable of bearing super high tightening torque. It is not easy to deform or slip during heavy-duty locking, meeting the high-strength fixing requirements of engineering and mechanical structures.

2. Dual anti-loosening and anti-vibration system. The matched spring washer provides continuous elastic pre-tightening force to offset mechanical vibration and structural displacement, while the flat washer evenly disperses pressure to prevent surface abrasion and loose fastening. The dual protection structure ensures long-term stable connection of operating equipment and engineering structures.

3. High-efficiency integrated assembly design. Adopting factory pre-assembled three-in-one structure, no manual gasket sorting and assembly is required on site. It effectively reduces assembly procedures, lowers labor costs and avoids hidden troubles such as missing gaskets and mismatched accessories in batch construction.

4. Standard thread & strong universal compatibility. The precisely rolled full machine thread features standard pitch and smooth meshing, compatible with all national standard and international standard nuts and reserved threaded holes. It realizes precise fitting and firm locking without thread slipping or jamming.

5. Durable industrial-grade stability. Through integral heat treatment and high-quality anti-corrosion surface treatment, the bolt has outstanding hardness, toughness and rust resistance. It adapts to various indoor and outdoor light industrial and engineering environments, with long service life and stable batch consistency.

FAQ

Q1: What is the difference between hex combination bolts and inner hex combination screws? 

A1: hex combination bolts adopt outer exposed hex driving design with higher torque resistance and heavier load-bearing capacity, focused on engineering and heavy machinery fastening; inner hex combination screws are suitable for precision equipment and limited space assembly with relatively lower load requirements.

Q2: Are the pre-assembled gaskets firm enough for long-term use? 

A2: All gaskets are fixed by professional high-pressure crimping process, with tight fit and no displacement. They will not fall off during transportation, repeated disassembly and long-term vibration, ensuring overall structural integrity.

Q3: Is this combination bolt suitable for outdoor engineering projects? 

A3: Yes. With multiple anti-corrosion surface treatment options and high structural strength, it can adapt to outdoor conventional and humid working environments, widely used for steel structure and outdoor equipment fixing.

Q4: Can non-standard sizes and customized logos be supported? 

A4: We support full-dimensional customization including special bolt lengths, non-standard thread specifications, exclusive surface colors and laser marking services to meet OEM and personalized engineering matching needs.

Q5: What tools are required for installation? 

A5: It matches conventional socket wrenches, electric wrenches and torque wrenches, with wide tool compatibility and convenient on-site construction, suitable for large-scale engineering batch operation.