Insert the assembly
The tapered bolt and expansion sleeve are placed through the aligned coupling holes.
Zero-clearance coupling bolts
Nord-Lock EZ Fit Expansion Bolts
An expanding bolt system for rotating flanges and shaft couplings that removes radial clearance without line reaming.
Nord-Lock Group technologyProduct overview
Built for secure, serviceable joints.
EZ Fit combines a tapered bolt with an expanding sleeve. Axial tightening drives the sleeve outward until it fills the coupling hole, forming a rigid zero-clearance connection that can transmit torque and reversing loads.
- Eliminates radial play in the coupling hole
- Reduces fretting and movement-related wear
- Avoids line reaming required by fitted bolts
- Faster installation and straightforward removal
- Reusable design for planned maintenance
How it works
Expand to fill the coupling hole
The sleeve is installed with the tapered bolt in a standard-clearance hole, then expanded by the axial tightening action.
Tighten axially
The tapered components move together and force the sleeve to expand radially.
Fill the clearance
The sleeve conforms to the hole wall and creates a rigid, zero-clearance connection.
Secure the joint
The completed assembly transfers torque while the axial locking arrangement prevents loosening.
Typical applications
Where this solution fits.
01Rotating shaft couplings
02Turbine and generator flanges
03Marine propulsion systems
04Large industrial drives
05High-torque or reversing-load connections
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