LCN 4021REGALLH Left Hand Adjustable 1-5 Top Jamb Push Side Mounted Door Closer with TBSRT Thru Bolts 689 Aluminum Finish

This LCN 4021 closer mounts on the push side top jamb with left-hand configuration. It controls door swing speed and ensures reliable closing for medium to heavy-duty commercial applications where consistent operation matters for code compliance.

The cast iron body houses a double heat treated steel pinion and forged steel main arm for long-term durability. All weather fluid maintains performance across temperature ranges. Spring size adjusts from 1 through 5 to match door weight and width requirements.

Thru-bolt mounting with TBSRT hardware provides secure attachment to hollow metal or wood frames. The aluminum finish resists corrosion in exterior applications. Peel and stick templates speed installation layout.

Series	4020 Series
ANSI Grade	Grade 1
Mounting	Push Side Top Jamb
Handing	Left Hand
Finish	689 Aluminum
Spring Size	Adjustable 1-5

Meets ANSI/BHMA A156.4 Grade 1 requirements and carries UL listing for fire-rated door assemblies.

Selecting the right spring size depends on door dimensions and weight - reference the door closer selection guide for proper sizing. For applications requiring fire door compliance, see ANSI A156.4 door closer standards covering Grade 1 performance criteria.