1. Working Principle
An expansion screw consists of a screw rod and an expansion tube. After inserting it into a wall hole and tightening the nut, the rod pulls and expands the tube, which tightly clings to the hole wall to achieve firm fixation. It is a detachable fastener suitable for fixing various perforated components.An expansion screw consists of a screw rod and an expansion tube. After inserting it into a wall hole and tightening the nut, the rod pulls and expands the tube, which tightly clings to the hole wall to achieve firm fixation. It is a detachable fastener suitable for fixing various perforated components.
2. Types of Expansion Screws
Classification by Material
Plastic Expansion Screws
A substitute for traditional wooden wedges. Standard sizes (6×30, 8×40) apply to light fixtures such as towel bars, tool hangers and decorative paintings. Extended sizes (8×60, 8×80, 8×100, 10×80, 10×100) are suitable for medium-heavy equipment like LCD TVs and range hoods.
Stainless Steel Expansion Bolts
Available types: external expansion bolts, outer hexagon internal expansion bolts, expansion hooks, ring-type expansion bolts.
Common specifications: 6×60, 6×80, 6×120, 6×150. Select the size according to actual wall conditions.
3. Installation Standards & Precautions
Drilling Requirement
The drilling depth shall be about 5mm deeper than the expansion tube length to ensure full embedding.
Installation Steps
Drill with an alloy drill bit matching the tube diameter.
Keep the hole depth consistent with the bolt lengthn.
Put the complete screw assembly into the hole. Do not remove the nut in advance to avoid falling.
Tighten the nut 2-3 turns for firm fixation, then remove the nut for component installation..
Precautions for use
Rotary hammer, 5mm/6mm drill bits, hammer, utility knife.
