Cold Bolts
Cold bolts are high-strength fastening components manufactured and installed under non-operating (cold) conditions. They are widely used in mechanical, structural, and industrial assemblies where controlled tightening, safety, and material integrity are required without exposure to live pressure or temperature.
Overview
Cold bolts are standard fastening elements installed or replaced when piping systems, equipment, or structures are not in operation. Unlike hot bolting, cold bolting is performed under safe, controlled conditions where no internal pressure, temperature, or hazardous media is present.
Manufacturing Characteristics
- Manufactured using controlled processes such as cold forging and cold rolling of threads
- Cold-rolled threads improve fatigue resistance and surface finish
- Forged bolt heads ensure uniform grain flow and higher mechanical strength
- Reduced risk of brittleness and critical material flaws when properly manufactured
Materials
- Carbon Steel
- Alloy Steel
- Stainless Steel
- Special grades available for low-temperature or high-strength applications
Installation Conditions
- Installed on non-pressurized and non-operational systems
- Allows precise torque application and controlled tightening
- Minimizes safety risks compared to hot bolting procedures
Applications
- Structural steel connections
- Flanged joints during plant shutdowns
- Machinery assembly and maintenance
- Industrial equipment and piping systems
- Construction and infrastructure projects
Advantages of Cold Bolting
- Safer installation compared to bolting on live systems
- Higher accuracy in bolt preload and torque control
- Lower risk of leakage, blowout, or mechanical failure
- Improved long-term joint reliability
Cold Bolting vs Hot Bolting
Cold bolting is considered best practice in most industrial standards, as it eliminates the hazards associated with working on live equipment. Hot bolting is only used when shutdown is not possible, whereas cold bolting is preferred whenever safe system isolation can be achieved.
Quality & Standards
Cold bolts are manufactured and supplied in accordance with applicable international standards and material specifications, ensuring consistency in mechanical properties, dimensional accuracy, and long service life.