Norton Rixson HM51 Series 3/4" Offset Shallow Depth Floor Closer for Hollow Metal Doors - 250 lbs Capacity with Backcheck

Norton Rixson HM51 Series 3/4" Offset Shallow Depth Floor Closer for Hollow Metal Doors - 250 lbs Capacity with Backcheck

Professional Shallow-Depth Floor Closer for Hollow Metal Door Applications

The Norton Rixson HM51 Series delivers professional-grade door control for hollow metal doors weighing up to 250 lbs. This 3/4" offset-hung floor closer features shallow-depth design ideal for multi-story buildings, with robust Cycolac rust-proof cement case construction. The system includes three special steel 4-1/2" ball bearing standard weight hinges with 3/4" offset for complete door support and control. Single acting operation with separate independent valves provides precise control over closing speed, latch speed, and backcheck functions.

Professional Features & Benefits

• Heavy-Duty Door Support: Supports doors up to 250 lbs with door widths up to 4' 0" (1219mm) for versatile commercial applications.
• Shallow Depth Design: 3/4" offset-hung configuration with shallow depth construction ideal for upper levels of multi-story buildings where space is limited.
• Complete Hinge System: Includes three special steel 4-1/2" ball bearing standard weight hinges with 3/4" offset for doors over 90" in height.
• Precision Control Valves: Separate independent valves for closing speed, latch speed, and backcheck provide enhanced operational control and adjustment capability.
• Vandal-Resistant Construction: Concealed in-floor installation with Cycolac rust-proof cement case provides protection from tampering and weather exposure.
• Flexible Installation Options: Available with floor plate or threshold installation, plus interchangeable spindle adapters and extended spindles in 1/2" increments up to 2" longer than standard.
• Hold Open Configuration: Available non-hold open (NBC) or automatic hold open (ABC) with 90° or 105° options, doors swing 5° beyond hold open point.
• Manufacturer Warranty: 2-year limited warranty for added confidence and protection.

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: HM5103NBC
• Product Subgroup: Door Closers - Floor
• Product Type: Floor Door Closers - Shallow Depth
• Series: HM51 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, weight capacity up to 250 lbs, and hollow metal door and frame compatibility.
2. Use manufacturer-provided templates to mark mounting hole locations accurately for floor installation and hinge mounting positions.
3. Prepare floor surface and door frame by drilling required holes and routing as specified for the 3/4" offset configuration and shallow depth requirements.
4. Install the three included special steel 4-1/2" ball bearing hinges with 3/4" offset, adding additional hinge for doors over 90" in height as warranted.
5. Mount floor closer unit with surface mounted bottom arm using thru bolts, ensuring proper alignment with door swing path and selected hold open configuration (90° or 105° if applicable).
6. Adjust the separate independent valves for closing speed, latch speed, and backcheck to achieve desired door operation and test throughout full range of motion. 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
• Industrial and Warehouse Facilities
• Government and Municipal Buildings
• Retail Establishments with Heavy Traffic

Why Choose Norton Rixson Quality?

Norton Rixson HM51 Series floor closers deliver professional-grade reliability with robust steel construction and Cycolac rust-proof cement case designed for demanding commercial applications. The shallow-depth design with 250 lb door weight capacity and comprehensive valve control system ensures dependable performance in multi-story buildings where space constraints and heavy-duty operation are critical. 2-year limited warranty provides added confidence for long-term commercial installations.