Set estrattori viti Hazet 840/5 per viti e bulloni danneggiati M3–M18

Hazet 840/5 screw extractor set is designed for removing damaged, seized or rounded bolts and screws in metric sizes M3 to M18. The set includes a range of extractors matched to metric thread sizes so they can bite into the remaining metal of a fastener and turn it out without enlarging the hole. The tool set is intended for workshop, maintenance and repair applications where preserving surrounding components and avoiding additional drilling is important.

Advantages

The extractors are tailored to metric thread profiles to ensure reliable grip on damaged heads and shanks. The set covers a practical size range from small to medium fasteners, reducing the need to carry multiple individual tools. Because the extractors work by engaging the existing material rather than cutting a new profile, they can remove fasteners while minimizing damage to mating parts. The insert geometry and hardened construction provide durability under repeated use in professional environments.

Suitable for

• Removing rounded or seized bolts and screws in mechanical assemblies
• Workshop and maintenance tasks on machinery, vehicles and equipment
• Repair jobs where preserving surrounding components is required
• Situations where drilling out a fastener or replacing parts is undesirable

Key specifications

• Compatible fastener sizes: metric M3 to M18
• Range includes multiple extractor sizes matched to standard metric threads
• Design: extractors shaped to engage damaged heads and shanks without enlarging holes
• Material: hardened tool steel for wear resistance and longevity
• Intended use: workshop and maintenance applications

How to use

Select the extractor size appropriate for the damaged fastener so the tool will engage firmly with remaining material. Secure the workpiece to prevent movement, then center the extractor on the fastener and apply steady torque in the removal direction using an appropriate driver or wrench. If necessary, apply penetrating lubricant prior to turning and work with controlled force to avoid further rounding. Proceed gradually; if the fastener does not move, re-evaluate fit or try the next extractor size within the set.

Recommendations

Use protective eyewear and gloves during extraction operations. Apply penetrating oil and allow time for it to work on rusted or seized fasteners. For fragile assemblies or where access is limited, take incremental approaches and avoid excessive impact that could damage surrounding components.