Norton Rixson QT51 Series 3/4" Offset Quick Install Floor Closer with Threshold - 250 lbs Door Weight Capacity

Norton Rixson QT51 Series 3/4" Offset Quick Install Floor Closer with Threshold - 250 lbs Door Weight Capacity

Professional Shallow-Depth Floor Closer Solution

The Norton Rixson QT51 Series delivers professional-grade door control for interior doors weighing up to 250 lbs with its innovative 3/4" offset-hung design. This shallow-depth floor closer is specifically engineered for 1-3/4" door installation and features a rust-proof cement case with Cycolac cover for enhanced durability. The system includes a 180° top pivot and M19 intermediate pivot for doors up to 90" in height, with fire rating capability for 20-minute labeled doors.

Professional Features & Benefits

• Door Weight Capacity: Supports doors up to 250 lbs with robust internal components for reliable long-term performance in commercial applications.
• Shallow Depth Design: 3/4" offset-hung configuration ideal for upper levels of multi-story buildings where space constraints require minimal floor penetration.
• Enhanced Door Control: Separate independent valves for closing speed, latch speed, and backcheck provide precise operational adjustment for optimal door performance.
• Vandal-Resistant Construction: Concealed in-floor installation with rust-proof cement case and Cycolac cover protects against tampering and environmental damage.
• Quick Install System: Surface-attached bottom arm allows closer removal without demounting door, reducing maintenance time and complexity.
• Flexible Door Compatibility: Accommodates doors up to 4' 0" width and 90" height with included pivots, plus extended spindles available in 1/2" increments up to 2" longer than standard.
• Fire Rating Capability: Certain models UL Listed with F prefix and fire rated for 20-minute labeled doors for code compliance applications.
• Manufacturer Warranty: 2-year limited warranty provides added confidence and protection for commercial installations.

Technical Specifications

• Commercial/Residential: Commercial
• Cover Type: Cycolac, rust-proof cement case
• Delay Function: Yes
• Department: Door Hardware
• Door Swing: Single Acting
• Door Weight: 250 lbs.
• Duty Level: Standard Duty
• Fire Rating: Yes
• Hang Type: Offset Hung
• Hold Open Feature: No
• Mounting Method: Offset
• Product Category: Door Controls
• Product Group: Door Controls
• Product Model: Q5103NBC
• Product Subgroup: Door Closers - Floor
• Product Type: Floor Door Closers - Shallow Depth
• Series: QT51 Series
• Spring Type: Fixed Size
• Subcategory: Floor Closers
• UL Listing Type: Certain models UL Listed (F prefix)
• Warranty: 2 Year Limited

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including door thickness of 1-3/4", door weight up to 250 lbs, and floor conditions for shallow-depth installation.
2. Use manufacturer-provided templates to mark floor pocket location and mounting hole positions for the 3/4" offset configuration accurately.
3. Prepare floor pocket to specified depth and install rust-proof cement case with proper drainage considerations for the shallow-depth design.
4. Install 180° top pivot and M19 intermediate pivot per manufacturer specifications, ensuring proper alignment for doors up to 90" height.
5. Mount mortise arm with thru bolt attachment and adjust vertical door positioning using built-in adjustment mechanisms.
6. Configure separate independent valves for closing speed, latch speed, and backcheck to achieve desired door operation characteristics throughout the full swing range.
7. Test complete door operation including swing beyond hold open point and verify all adjustment settings. Refer to manufacturer documentation for complete installation details and valve adjustment procedures.

Professional Applications

• Commercial Office Buildings
• Educational Facilities
• Healthcare Institutions
• Multi-Story Building Upper Levels
• Retail Establishments
• Government and Municipal Buildings
• Fire-Rated Door Applications

Why Choose Norton Rixson Quality?

Norton Rixson QT51 Series floor closers deliver professional-grade reliability with robust materials and internal components designed for demanding commercial applications. The rust-proof cement case with Cycolac cover and UL listing capability for fire-rated applications demonstrate the engineering quality built into every unit. Backed by a 2-year limited warranty, this shallow-depth design provides the perfect solution where space constraints require reliable door control without compromising performance.