Pemko 157 Series Fire-Rated Of...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$72.27
$61.95
Pemko 157 Series Fire-Rated Offset Saddle Threshold cross-section diagram showing 5-1/2" width and 3/4" height dimensions

Pemko 157 Series Fire-Rated Offset Saddle Threshold 5-1/2" x 3/4" Aluminum

(No reviews yet) Write a Review

Model: 157A 36
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$72.27
$61.95
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Pemko 157 Series Fire-Rated Offset Saddle Threshold — 5-1/2" x 3/4" Aluminum

The Pemko 157 Series Offset Saddle Threshold is a fire-rated aluminum threshold engineered for commercial door openings where floor surfaces meet at a 1/2" height offset — tile to carpet, concrete to resilient flooring, or similar transitions. At 5-1/2" wide and 3/4" tall, it covers the full transition zone cleanly while maintaining a low-profile saddle profile that meets ADA and code requirements for commercial egress doors.

Fire Rating & Code Compliance

  • UL 10C Positive Pressure Listed — qualifies for use in positive-pressure fire-rated door assemblies
  • UL 4L10 Listed — meets construction requirements for fire-rated assemblies
  • ANSI/BHMA A156.21 — compliant with the commercial threshold standard for door hardware

Technical Specifications

  • Width: 5-1/2"
  • Height: 3/4"
  • Height Offset: 1/2"
  • Material: Aluminum
  • Available Finishes: Mill Finish Aluminum (157A), Dark Bronze Anodized Aluminum (157D)
  • Available Lengths: 36", 48", 72", 84" (standard); custom lengths 24" minimum to 185" maximum
  • Fasteners: #10 x 1.5" wood screws standard; other fastener options available
  • Weight: 0.93 lbs per unit

Typical Applications

  • Commercial office buildings and tenant fit-outs
  • Healthcare facilities and hospitals
  • Educational institutions
  • Retail and hospitality
  • Government and municipal buildings
  • Multi-family and mixed-use residential
  • Industrial and warehouse facilities

Why Pemko 157 Series

Pemko is the specification-grade threshold brand of choice for architects, contractors, and facility managers. The 157 Series ships in standard lengths or cut to your exact opening — up to 185" — so you order once and install without field modification. UL 10C and UL 4L10 listings are documented and verifiable, making submittal packages straightforward for fire-rated door assemblies.

Product Specs

Subcategory:
Thresholds
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Commercial Thresholds
Commercial/Residential:
Commercial
Product Model:
157
Product Dimension:
W: 5-1/2", H: 3/4"
Product Substrate:
Aluminum
Product Category:
Door Trim and Accessories
Department:
Door Hardware
Series:
157 Series

Pemko 157A 36 – Frequently Asked Questions

1) Will the Pemko 157 threshold work where tile on one side of the door sits higher than the carpet on the other?
That is exactly the opening the 157 Series is built for. It is an offset saddle, meaning the profile carries a 1/2 inch height difference from one side to the other, so it bridges tile to carpet, concrete to resilient flooring, or any similar transition where the two finished floors do not land at the same level. At 5-1/2 inches wide it sits over the frame and the flooring seam on both sides, and it stands 3/4 inch tall overall. Measure the actual difference between your two finished floors first: the 157 handles a 1/2 inch step. If your transition is materially larger or smaller than that, the offset will not sit flat on both sides.
2) My floors are the same level on both sides of the door. Should I use an offset saddle threshold like the Pemko 157?
No. The 157 Series has a 1/2 inch height offset designed into the profile, so one side of the saddle is built to land on a floor that is half an inch lower than the other. Set it on two floors at the same level and the low side has nothing under it, which leaves it unsupported and liable to rock or deflect underfoot. For a flush opening you want a flat saddle threshold with a symmetrical profile rather than an offset one. Save the 157 for the openings in the building where the flooring actually changes height.
3) Can I use the Pemko 157 saddle threshold on a fire-rated door opening?
Yes. The 157 Series is UL 10C positive pressure listed, which is the listing you need for a threshold going into a positive-pressure fire-rated door assembly, and it is also UL 4L10 listed for construction in fire-rated assemblies. It is built to ANSI/BHMA A156.21, the commercial threshold standard. Those three lines are what a plan reviewer or an AHJ looks for, and they are what goes on the submittal for a rated opening in a hospital, a school, or a stair enclosure.
4) Which way does an offset saddle threshold face when you install it?
Orientation matters on the 157, because the profile is not symmetrical. It carries a 1/2 inch height difference across its 5-1/2 inch width, so the high side goes down on the higher finished floor and the low side on the lower one. Get it backwards and you have built a step instead of removing one. Confirm which side of the opening is high before you set the threshold and drill, since the fastener holes go through the aluminum into the substrate below.
5) Does the Pemko 157 threshold come with screws, and what do I use to anchor into a concrete slab?
Standard fasteners with the 157 are #10 x 1-1/2 inch wood screws, which suits a wood subfloor or a wood-framed opening. Anchoring into a concrete slab is a different fastener, and Pemko offers other fastener options on the 157 for that reason, so specify the anchor type with the order rather than assuming the packed screws will do the job. Worth sorting out before the crew is on site, since a threshold set into concrete needs the holes drilled and anchored, not just driven.
6) Is 5-1/2 inches wide enough to cover the door frame and the flooring seam at the threshold?
At 5-1/2 inches wide, the 157 saddle spans well past a standard commercial frame footprint and lands on finished floor on both sides of the opening, which is what you need when the flooring changes material under the door. That extra width is the point of a saddle in this size: it covers the raw edge where tile meets carpet or concrete meets resilient, so neither flooring contractor has to detail a clean termination at the door. Overall height is 3/4 inch, with the 1/2 inch of that being the offset between the two floor levels.
7) Is a 3/4 inch tall threshold going to be a problem for accessibility on a commercial egress door?
The 157 stands 3/4 inch tall overall, and Pemko lists the low-profile saddle as meeting ADA and code requirements for commercial egress doors. The number that usually gets scrutinised is the step it creates, and here the profile absorbs a 1/2 inch floor-height difference rather than adding one on top of level floors. On a rated egress opening the 157 also carries the UL 10C positive pressure listing and ANSI/BHMA A156.21, so the accessibility and the fire side of the submittal are covered by the same part.
8) What is the difference between the Pemko 157A and 157D thresholds?
Finish, and nothing else. The 157A is mill finish aluminum, the raw natural aluminum look that disappears against aluminum storefront and standard hollow metal work. The 157D is dark bronze anodized aluminum, which is what you want against bronze or dark anodized frames and darker door hardware. Both are the same 5-1/2 inch by 3/4 inch offset saddle in the same aluminum, and both are stocked in the 36, 48, 72 and 84 inch lengths, so a property manager standardizing across a building can pick one finish and carry it through every opening.
9) Will an aluminum threshold hold up to hospital floor cleaning and heavy cart traffic?
The 157 is an aluminum saddle rated commercial, and healthcare facilities are one of the applications Pemko names for the series along with schools, retail, hospitality, government buildings and multi-family. Aluminum takes the wet mopping and the disinfectant regimes those floors see without rusting the way a plated steel plate would. Where the traffic is hardest on appearance, the dark bronze anodized version (157D) has an anodic surface layer rather than a bare mill face, so scuffing from cart wheels reads less obviously than it does on mill finish.
How fast can I get the Pemko 157A 36 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 Pemko 157A 36 come with a warranty?
Absolutely. The Pemko 157A 36 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 Pemko 157A 36?
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 Pemko 157A 36 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.
!