Mill Liner Bolts
Molycop Engineered designs and manufacturers a range of SAG and Ball mill liner bolts for the mining and mineral processing industry. Manufactured from carbon alloy steel, we customize our bolts to satisfy our customer requirements.
Molycop Engineered controls the end-to-end process for this product range. From in-house design, through to integrated steel manufacturing and machining, we control each stage of the process to ensure that our product meets the highest standard and integrity.
All head shapes, lengths, and diameters of forged products are catered for and customised for any requirement. Specific design, tension, and optimal head seating are critical components to reduce mill shut down risk.
Our product line includes: Oval head liner bolts, Square head liner bolts, Hex head liner bolts and Tee head liner bolts
Easy-Out Bolts
Our patented Easy-Out Bolts are designed to reduce the potential for personal injury, damage to equipment and shorten liner change-out times.
These Easy-Out Bolts design consists of a standard liner bolt which has been modified to be used in conjunction with a specially designed moil fitted to any standard hydraulic or pneumatic hammers. Both the Easy-Out Bolts and moil are custom manufactured and supplied by Molycop Engineered to suit specific customer requirements.
After removing the nut, the moil is inserted into the bolt end. Without the need to remove recessed or seal washers the bolt can be driven out of the liner and completely clear of the mill shell in one movement. Recent trials at a large copper concentrator have shown that bolt removal time was halved by using Easy-Out Bolts. The positive location between the moil, or drift, and the bolt eliminates the risk of mill damage due to misalignment of hydraulic hammer moils or sledgehammer damage around bolt holes. The use of Easy-Out Bolts also improves safety by removing the need for a man between the hammer and the mill.
Twistlock Pins
Twistlock Pins are manufactured with the finest precision and complete material composition certainty for our customers.
The nature of the lifting role of twist lock pins, within shipping containers and mobile plant lifting equipment, commands the highest of structural integrity to comply with associated standards.
Customised Fasteners
Fasteners are manufactured to AS4291.1:2015 “Mechanical properties of fasteners made from carbon and alloy steel”, Part 1 and AS/NZS ISO 9001:2015 quality standards. Technical specification, chemical and mechanical properties are in accordance with the standards.
The product is heat treated to achieve Grade 8.8 requirements for Steel Grade 4140.
The product line includes: oval head liner bolts, square head liner bolts, hex head liner bolts and tee head liner bolts.
Quality Accreditation
We provide comprehensive quality control and certification to ensure compliance with all specified requirements.
- AS 4291.1:2015, Mechanical properties of fasteners made from carbon and alloy steel – Part 1: Bolts, screws and studs
- ISO 6157.1:1988, Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements
- ASTM F1470 – 02, Standard Guide for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
- ISO 3269:2019, Fasteners – Acceptance inspection
