Norton Rixson QT51 Series 3/4"...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3,275.00
$3,004.60
Norton Rixson Norton Rixson QT51 Series - 3/4" Offset Quick Install Removable Shallow Depth Floor Closer with Threshold, 250 lbs. Door Weight RIX-QT51

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

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Model: QT5103-90NBC-RH-626
$3,275.00
$3,004.60
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$3,275.00
$3,004.60
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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.

Product Specs

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

Norton Rixson QT5103-90NBC-RH-626 – Frequently Asked Questions

1) Will the Norton Rixson QT51 floor closer handle a 250 lb door?
250 lbs is the rated door weight for the QT51 Series, and it is a standard duty, single acting closer for commercial interior openings. Door size is capped as well: up to 4 ft 0 in wide and 90 in tall using the included 180 degree top pivot and M19 intermediate pivot. If your leaf is heavier than 250 lbs or taller than 90 inches, this is not the right closer.
2) What door thickness does the QT51 Quick Install floor closer require?
It is built for 1-3/4 inch doors, which is the standard commercial thickness. The offset-hung geometry is fixed at a 3/4 inch offset, so a thinner 1-3/8 inch leaf will not prep correctly to it.
3) Can I get the Norton Rixson QT51 on a 20-minute fire labeled door?
Yes, with the right model. Certain QT51 models are UL Listed and carry an F prefix in the model number, and those are fire rated for 20-minute labeled doors. The hold open arm option is not appropriate on a fire door; for a labeled opening you want the non-hold-open arm.
4) Why choose a shallow depth floor closer instead of a standard full depth one?
Shallow depth is what you specify when you cannot cut a deep pocket, typically upper floors of a multi-story building where the slab or the structure below limits how far you can penetrate. The QT51 cement case sits shallow for that reason. On a ground floor slab with room below, a full depth floor closer gives you more spring range; the tradeoff here is that the QT51 spring is a fixed size rather than adjustable.
5) When do I need the extended spindle option on a QT51 floor closer?
When the finished floor sits higher than the closer case, which is the usual case if carpet, tile or a topping slab goes down after the case is set. Extended spindles come in 1/2 inch increments up to 2 inches longer than standard. Measure from the top of the closer body to your finished floor before ordering, because a short spindle means pulling the bottom arm apart on site.
6) Can the QT51 be serviced without taking the door down?
That is the point of the Quick Install design. The bottom arm is surface attached, so the closer body can be pulled out of the floor case for service or replacement with the door still hung. On a conventional floor closer you normally have to demount the leaf to get at the unit.
7) Does the QT51 floor closer hold the door open?
Depends which arm you order. The automatic hold open arm catches the door at the hold open point; the non-hold-open arm lets it close from any position. Order the non-hold-open version for fire rated openings and anywhere the door must be free to close.
8) Is the QT51 a pivot set as well, or do I order pivots separately?
Pivots come with it. A 180 degree top pivot and an M19 intermediate pivot are included and cover doors to 90 inches in height. The mortise arm attaches with thru bolts, and vertical door position is set with the built-in adjustment.
9) How adjustable is the closing action on the Norton Rixson QT51?
Three separate independent valves: closing speed, latch speed and backcheck, each adjusted on its own. Delay action is also part of the unit. Backcheck matters in windy lobbies and on doors that get thrown open, since it cushions the swing before the door hits anything.
10) Will a QT51 floor closer hold up in a wet or high-traffic entry?
The case is a rust-proof cement case with a Cycolac cover, and the whole unit sits concealed in the floor, so there is nothing at hand height to vandalize or knock loose. That in-floor, covered construction is why floor closers get specified for schools, healthcare corridors and municipal buildings over surface closers.
11) What finishes does the Norton Rixson QT51 come in so I can match the rest of my openings?
Thirteen: 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 oil rubbed bronze, 613E dark oxidized satin bronze, 618 bright nickel, 619 satin nickel, 622 black painted, 625 bright chrome, 626 satin chrome, plus BSP black suede powder and WSP white suede powder. 626 satin chrome and 613 oil rubbed bronze are the two that most commonly match existing commercial trim.
How fast can I get the Norton Rixson QT5103-90NBC-RH-626 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Norton Rixson QT5103-90NBC-RH-626 come with a warranty?
Absolutely. The Norton Rixson QT5103-90NBC-RH-626 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Norton Rixson QT5103-90NBC-RH-626?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Norton Rixson QT5103-90NBC-RH-626 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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