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Slewing Ring Bolts & Special Lifting Fasteners

Energy Bolting is a special bolting supplier with a focus on high tensile, performance critical, fully tested and certified slew ring fasteners and crane bolting.


Industries & Use Applications

Offshore/Marine cranes, tower cranes and slewing ring structures.

Energy Bolting supply both ‘’Special’’ where bolting is part of a slewing ring connection & ‘’Primary’’ where the bolts or nuts are transferring principle loads.


Products, Materials & Coatings


Hexagon Bolts, Socket Head Capscrews, Hex Nuts, Double Ended Studs, Washers and items to client drawing/design.


Bolts & Threaded Components

ISO 898-1 Grade 8.8, ISO 898-1 Grade 10.9, ISO 898-1 Grade 12.9

Hexagon Nuts

ISO 898-2 Grade 8, ISO 898-2 Grade 10, ISO 898-2 Grade 12


A variety of surface finishes are available including: PTFE, Hot Dip Galvanising, Zinc & Zinc Nickel.


Testing, Inspection & Documentation

Product in accordance with DNV standards for offshore and platform lifting appliances.

EN10204 3.1 certification and independent third party witness for inspection and testing where required EN10204 3.2

We are also able to provide: Manufacturing Process Specifications, Quality Plans, Inspection & Test Plans, Third Party Test Reports, ​Dimensional Reports, Document Pack.

Additionally we offer a full range of Destructive/Non-Destructive testing available including

Tensile (Ambient / Elevated)

Impact: Charpy / Izod (Ambient / Sub-Zero)

Hardness ​​

Proof Load

PMI (Positive Material Identification)

MPI (Magnetic Particle Inspection)

Dye Penetrant



Chemical Analysis

Send your enquiries for a prompt and competitive quotation


Energy Bolting supply a diverse range of special fasteners, machined components and associated products.

Find out more about our vision and values:

Find out more about what we do:


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