Custom Steel Hot Forginig Eccentric Bolt

Custom steel hot forging eccentric bolts are specialized fasteners crafted through precision hot forging processes, designed to meet unique mechanical needs in applications requiring offset load distribution or adjustable alignment. Unlike standard bolts with concentric shanks and heads, these bolts feature an eccentric design, where the shank's axis is intentionally misaligned with the head's center, enabling precise positional adjustments or controlled eccentricity in assemblies.


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Product Description

Product Introduction

This is a hot forging eccentric bolt specifically engineered for installation on electricity meter boxes, boasting a set of distinctive features that set it apart from standard bolts and make it uniquely suited to its role.

Unlike ordinary bolts, its design is highly specialized: the head is significantly larger, providing a broad, stable bearing surface that distributes clamping force evenly across the meter box's mounting points. The thread specification is M8, a common yet reliable size that balances holding power with ease of installation, ensuring compatibility with standard nuts and the pre-drilled holes in meter box frames.

It's special design makes this hot forging bolt an essential component for secure, adjustable, and durable installation of electricity meter boxes, addressing the unique demands of electrical infrastructure mounting.

hot forging bolt

Material and process

This is made from steel material by hot forging process.

Here is the hot forging eccentric bolt's drawing:

eccentric bolt drawing

We conduct a analyzation of this bolt when we received the drawings. This part needs OD 12mm bars to hot forging or hot press. After the material is punched out, two flat surfaces need to be machined.

The threaded end needs to be CNC turning to 8mm and then roll the thread.
The head section needs to be flat, so use CNC turning to remove the entire surface, and then it will be very flat. There will be an eccentric fixture needs to be made. CNC machining can't be used because it's much more expensive.

Then we move forward to the production. High-quality alloy steel is heated to temperatures between 800–1200°C, rendering the metal malleable yet retaining its structural integrity. The heated steel billet is then shaped under extreme pressure using custom dies, which imprint the eccentric geometry—including the offset shank, threaded section, and head in a single or multi-step forging operation. This method eliminates internal voids, aligns the metal's grain structure along the bolt's contours, and enhances tensile strength, impact resistance, and fatigue life compared to cold-formed or machined alternatives.

Below is our hot forging machine:

hot forging machine

After finishing the hot forging, they are sent to undergo the white zinc plating, here are the finished bolts:

the finished bolt finished bolt 1

Packing

This eccentric nut is packaged individually in bubble bag to prevent scratches and bumps during handling. The bubble bag forms a protective cushion that tightly wraps around the nut, creating a barrier against friction and minor impacts that could damage its surface or threads.

After individual wrapping, the bolts are placed into sturdy cardboard boxes, the boxes are then loaded onto pallets, with each pallet carefully stacked to ensure stability and maximize space efficiency. Finally, the entire pallet is wrapped tightly with stretch film, which secures the boxes in place, prevents them from shifting or scattering during transportation, and also offers some protection against dust and moisture.

eccentric bolt package

Ningbo Joyo Metal products Co.,Ltd. excels in manufacturing a wide range of metal products, with strict quality control embedded in every stage of production.