Cal-Royal CR271536 Saddle Threshold 1/2" H x 5" W x 36" L

The Cal-Royal CR271536 is a commercial-grade aluminum saddle threshold sized 1/2" H × 5" W × 36" L, engineered for exterior entry doors, interior fire-rated doors, ADA accessibility retrofits, and barrier-free transitions over carpet. The 1/2" overall height meets the maximum allowable threshold height under ADA 2010 Standards § 303 with the required beveled transition profile, making the CR271536 specifiable on any opening that needs ADA compliance without resorting to ramped or recessed installations. Heavy-duty extruded aluminum construction handles foot traffic, rolling cart loads, wheelchair traffic, and weather exposure on exterior openings. The 5" width provides adequate footprint to seal against typical commercial door bottom sweeps and weather strips. Three-hour positive pressure fire rating (meets UL 10B, UL 10C, and UBC 7-2 1997) makes this threshold specifiable on the highest fire-rated openings, including stairwell doors, elevator lobby doors, occupancy separation walls, and hazardous occupancy doors. Available in standard mill aluminum or Duranodic dark bronze finish. #10 × 1-1/2" wood screws included for direct installation into the wood subfloor or pre-tapped metal frame. Optional Sure Step non-slip abrasive coating available for high-moisture environments and exterior weather-exposed openings. 

Where the CR271536 Fits in Cal-Royal's Threshold Family

Cal-Royal Products is a U.S. commercial hardware manufacturer (Los Angeles, in business since 1986) supplying value-engineered architectural hardware that meets the same UL fire-rating standards and ADA compliance specifications as Pemko, NGP (National Guard Products), Reese Enterprises, and Zero International. Within Cal-Royal's threshold lineup, the CR2715 family is the 1/2" × 5" saddle profile, of which the CR271536 is the 36" length variant. The CR2715 length-variant family extends to longer doors at 42", 48", 60", and 72" lengths through Cal-Royal's catalog, though americanlocksets.com currently stocks the 36" variant on this URL — for longer threshold lengths in the same 5" profile, see comparable NGP 425E variants linked below. For the broader threshold lineup see Cal-Royal Thresholds within the Saddle Thresholds category under Thresholds/Gasketing.

CR271536 Specifications

• Profile dimensions: 1/2" H × 5" W × 36" L

• Material: extruded aluminum (heavy-duty commercial gauge)

• Finishes: Aluminum (mill finish) standard, Duranodic Dark Bronze (DUR) optional

• ADA compliance: meets ADA 2010 Standards § 303 maximum threshold height of 1/2" with required 1:2 beveled transition profile

• Barrier-free rating: handicap accessible, barrier-free over carpet (transition does not exceed 1/2" measured from carpet pile surface)

• Fire rating: 3-hour positive pressure (meets UL 10B, UL 10C, and UBC 7-2 1997)

• Specifiable on: stairwell doors, elevator lobby doors, occupancy separation walls, hazardous occupancy doors, and any commercial fire-rated opening up to 3-hour rating

• Fasteners included: #10 × 1-1/2" wood screws (sized for direct installation into wood subfloor or pre-tapped metal frame)

• Optional finish: Sure Step non-slip abrasive coating (recommended for high-moisture environments, exterior weather-exposed openings, and ADA accessibility paths where slip resistance is a project priority)

• Model variants: CR271536 (standard), CR271536 ALUM (aluminum mill finish explicit), CR271536 DURO (Duranodic dark bronze explicit)

• Brand context: Cal-Royal Products, U.S. commercial hardware manufacturer (Los Angeles, established 1986)

When to Specify the CR271536 Saddle Threshold

The 1/2" × 5" × 36" sizing fits standard 36" wide commercial doors, which is the most common door width in commercial construction (storeroom doors, office entry doors, classroom doors, exam room doors, and most institutional single-leaf openings). Three application contexts point to this specific SKU:

• ADA retrofit projects in older buildings being updated to current accessibility standards. Older thresholds at 3/4" or 1" height fail current ADA requirements; replacing with the CR271536 brings the opening into compliance without ramping or major reconstruction.

• Fire-rated commercial openings requiring 3-hour positive pressure rating. The UL 10C compliance makes this threshold one of relatively few aluminum saddle options specifiable on the highest fire-rating tier, where most commercial aluminum thresholds top out at 1.5-hour or 1-hour ratings.

• Carpet-to-hard-surface transitions at interior commercial doors where carpet meets vinyl, tile, concrete, or hardwood. The barrier-free over carpet rating means the threshold can be installed directly over carpet without exceeding the 1/2" maximum transition height when measured from the carpet pile surface.

If the door is wider than 36" (double doors, oversized openings), look at the longer-length variants in the comparable NGP 425E 5" aluminum saddle threshold family: NGP 425E 42", NGP 425E 48", NGP 425E 60", or NGP 425E 72". For wider profile applications (door sweeps that need 6" or 7" footprint), see the NGP 426E 6" Aluminum Saddle Threshold or NGP 427E 7" Aluminum Saddle Threshold families.