Manufacturing Services of Hot Forged Bolts at JM Hardware®

Steps for producing hot forged bolts

The fastener market is demanding more hot forged fastener product Hexagon and other Headed Bolts and Socket screws.

Bolts with Large diameters and exclusively above M36 are produced by hot forging.

Extreme long lengths again lend themselves to hot forging.

Short production runs for diameters M5 and above make hot forging a preferred alternative to avoid the high set-up costs for cold forming.

Step1：Find quality raw materials

Raw materials refer to the raw materials purchased from manufacturers, which mainly include the following parameters:

A. Brand

B. product name

C. Specifications

D. Material                                                                         

E. Heat number or batch number                                      

F. Number/weight

                                                     Round material&straight raw material at JM Hardware® factory

Step2：Wire drawing/Phosphating

Function

Wire drawing:

1. Rust removal

2. Pull until the specified wire diameter

Phosphating:

Smooth material surface to reduce damage to machine

                                                              Wire drawing/Phosphating at JM Hardware® factory

Step3：Cutting materials

Cutting equipment is mainly used for cutting, and the length of the material should be determined according to the design requirements, and the cutting is required to be accurate.

                                                         Cutting materials at JM Hardware® factory

Step4：Rear chamfer

Large size bolt tails are usually chamfered

Step5：Hot forging

Step6：Head chamfer

Mainly used for hexagonal heads

Step7：Roll Threading

Thread rolling uses two threaded rods to squeeze the workpiece to be machined, so that the surface of the part is pressed out of threads.

Step8: Heat treatment (not necessary)

Heat treatment is a thermal process that accomplishes three primary improvements to the material properties of metal castings:

Improving mechanical properties.

Enhancing corrosion resistance.

Reducing residual stresses.

                                                             Heat treatment production line at JM Hardware® factory

Step9:  Surface treatment

The surface treatment of fasteners is a process of forming a covering layer on the surface of the workpiece by a certain method, 

and its purpose is to endow the surface of the product with beautiful and anti-corrosion effects.

                             plain (before)                                                                                             Blcak（after）

Step10:  Sampling test

For the finished bolts, JM Hardware® will conduct sampling inspection to ensure the quality of our products

Step11:  Package

JM Hardware® offers a variety of packaging options to ensure that products are delivered to customers intact. 

Or you can also inform us of your packing requirements, we will do our best to meet your requirements

Step12:  Transportation

JM Hardware® will carry out the most suitable shipping according to the trade method you choose