How to loosen a stripped screw? A guide for machine service teams and operators

A stripped screw in a metalworking machine is not just a minor inconvenience, but a real risk of production downtime. In industrial environments where every operating hour counts, machine failures caused by seized or damaged fastening elements require a fast and professional response. In this article, you will learn how to safely resolve the issue and when it is worth replacing components with brand-new machine parts.

Why do screws in machine tools get damaged? (Workshop practice)

Under intensive operation, screws in machine tools work in extremely demanding conditions. The most common causes encountered by service technicians include:

• Process contamination: dust, coolant, and chips entering mechanisms, causing thread seizure
• Vibration and mechanical stress: continuous machine operation generates forces leading to micro-deformations and “seizing” of connections
• Operational errors: incorrect preload or improper lubricants used during assembly
• Exceeding operating parameters: running machines beyond allowable limits, accelerating wear of fastening components

Service tip: If resistance is noticed already at the initial loosening attempt, it is worth stopping before the screw head is completely damaged. At this stage, a simple technical issue can turn into an expensive repair.

Proven methods for removing a stripped screw

When damage occurs, precision is key to avoid damaging the machine body. Professional workshops use the following methods:

• Increasing grip (rubber band method): a simple trick for lightly damaged heads – a thick rubber band placed between the screwdriver and screw fills gaps and improves grip
• Impact driver: impulse force helps break the resistance of seized threads more effectively than steady manual pressure
• Professional screw extractor: for broken heads, drilling a hole and using a left-hand thread extractor is required
• Pliers or cutting a new slot: if the head protrudes, locking pliers or cutting a new groove for a flat screwdriver can be used

When should a screw in a machine be replaced?

A previously damaged or “rescued” screw should never be reused. In industrial machinery, every fastening element must ensure stability and safety in accordance with HSE standards.

Replace the screw if:

• The thread shows any deformation (risk of failure under load)
• The screw head has been mechanically damaged, making future maintenance difficult
• The machine operates under high vibration conditions – material fatigue may lead to sudden failure

Take care of your machine park with MultiMasz

Problems with fastening elements are often a signal that the entire machine requires inspection. At MultiMasz, we not only advise on handling failures but also provide comprehensive solutions for your business.

We offer:

• Fast delivery of high-quality machine parts
• Professional service and modernization of entire machine parks in line with safety requirements
• Technical consulting to help avoid costly downtime in the future

We supply screws and industrial machine components – ask about availability and restore your machine to full efficiency today!

👉 Contact our spare parts department: multimasz@multimasz.pl