You may also like
Stanley Security Grade 1 Surface Closer, Size 1-4, Tri-Pack Standard
Model: STN-D-1611
Stanley Security Grade 1 Surface Closer, Size 1-4, Tri-Pack Standard
The D-1610 Series is a slim line closer uniquely designed to accommodate the standard aluminum storefront application foot print...
Stanley Security
$204.00
$191.88
Stanley Security Grade 1 Surface Closer, Size 2-6, Standard Hold Open
Model: STN-D-4550H
Stanley Security Grade 1 Surface Closer, Size 2-6, Standard Hold Open
The model D4550 Series is Stanley’s best performing Heavy Duty Closer. The cylinder body is manufactured using R-14 Silicon...
Stanley Security
$534.00
$370.76
Stanley Security QRM311 - Grade 1 Mullion, Standard
The Stanley QRM311 is a Grade 1 listed mullion designed for installation with pairs of doors fitted with rim exit devices. Manufactured to withstand heavy commercial use, this mullion is “keyed-removable” (“KR”) for easy removal when access is required or for maintenance. Available in multiple lengths (8 ft, 9 ft, 10 ft, 11 ft, etc.) and finishes including Primer (600), Aluminum Painted (689/US28), and Dark Bronze Painted (695). Pre-prepped to accept Stanley’s QED100 and QED300 Series exit devices, the QRM311 provides strength, consistency, and design flexibility while maintaining high safety and durability standards
Specifications
| Specification | Details |
|---|---|
| Model | QRM311 – Keyed Removable Mullion |
| Grade / Rating | ANSI/BHMA Grade 1 Mullion Hardware |
| Finish Options | Primer (600), Aluminum Painted (689/US28), Dark Bronze Painted (695) |
| Lengths Available | 8′, 9′, 10′, 11′ (field-sizable) |
| Material / Construction | Steel tube, typically 2″ × 3″, 1⁄8″ wall thickness for standard usage. Head caps, bottom sills, and adapters investment cast steel in some variants |
| Compatibility | Pre-prepped for Stanley QED100 and QED300 Series exit devices |
| Fire / Hurricane Rating | Fire rating for openings up to 8 ft high (standard variants) |
| Key Feature | Keyed-removable design for ease of removal when needed (variant “KR”) |
Manufacturer Resources
Product Specs
- Product Group:
- Exit Devices and Trim
- Series:
- QRM300 Series
- Product Subgroup:
- Exit Devices - Rim
- Product Type:
- Mullions
- Subcategory:
- Exit Devices
- Commercial/Residential:
- Commercial
- Product Category:
- Exit Devices and Trim
- Department:
- Door Hardware
Stanley Security QRM311 8 689 – Frequently Asked Questions
1) What does a removable mullion like the Stanley QRM311 actually do on a pair of doors?
It gives each leaf of a pair something to latch into. Rim exit devices latch to a strike, and on a pair with no center post there is nothing there, so the QRM311 stands vertically between the two leaves and carries the strikes. Both doors then swing independently on standard rim devices instead of needing surface vertical rod hardware. When you need the full clear opening for moving equipment or furniture, the mullion comes out.
2) Should I order the keyed removable version of the QRM311 or the standard one?
Both are offered. Keyed removable (KR) lets authorized staff unlock the mullion with a key and lift it out, which is what you want on a loading entrance, a gym, a banquet room, or anywhere oversize items move through on a schedule. The non-keyed version stays fixed and is the simpler choice on an exit that never needs the full opening. Keyed removable is an option you pick when ordering, alongside length and finish.
3) What lengths does the Stanley QRM311 mullion come in, and can I cut one down for a shorter opening?
Order it at 8, 9, 10, 11 or 12 feet. The mullion is field-sizable, so you buy the next length up from your opening height and trim on site rather than hunting an exact match. Pick from the height of the frame rabbet, not the door leaf.
4) Is the Stanley QRM311 mullion fire rated?
Standard QRM311 variants carry a fire rating for openings up to 8 feet high. Above that height the rating does not follow, so on a 9, 10, 11 or 12 foot opening treat the longer mullion as a non-rated application unless your specification says otherwise.
5) I need a mullion that locks in place and comes out with a key - does the Sargent 980 do that?
The Sargent 980 is a removable mullion in its 980 series, so it is designed to come out of the opening, but the Stanley QRM311 is specifically offered in a keyed-removable configuration as well as a non-keyed one, selectable when you order. If the requirement is that only a keyholder can pull the post - typical where a wide opening has to be cleared for freight or furniture but the doors must stay secure day to day - order the QRM311 with keyed removable set to Yes.
6) Will a Sargent 980 mullion work with Stanley QED100 or QED300 exit devices?
The Stanley QRM311 arrives pre-prepped for Stanley QED100 and QED300 Series rim exit devices, so the strike prep lines up without field drilling. The Sargent 980 is a removable mullion of its own series and is prepped to its maker's pattern; pairing it with QED devices means verifying and likely field-preparing the strike locations. On an opening already running QED100 or QED300 hardware, the QRM311 is the matched post.
7) What finish should I order on the Stanley QRM311 mullion?
Three choices: 600 primer, 689 aluminum painted (also called US28), and 695 dark bronze painted. Primer is for openings you are painting on site to match a frame color. The 689 and 695 painted finishes are the ones that match common aluminum and dark bronze storefront and hollow metal frames straight out of the box. All three are available in every length from 8 through 12 feet.
8) Do I need a mullion at all, or should I just use vertical rod exit devices on the pair?
Two valid routes. A mullion plus two rim devices, which is what the QRM311 is for, keeps the hardware on the door face simple and lets each leaf work on its own, and the post can be removed for a clear opening on the keyed removable version. Surface vertical rod devices skip the post entirely by latching at the head and the threshold, which is the way to go when nothing may obstruct the opening and when you cannot have a removable component staff might lose. On a pair of rim devices with no mullion, the inactive leaf has nothing to latch to, so the mullion is not optional in that configuration.
9) For a Grade 1 institutional opening, which mullion should I specify?
The Stanley QRM311 is an ANSI/BHMA Grade 1 mullion with a fire rating for openings up to 8 ft high on standard variants, which is what most institutional and healthcare specs call out for a pair of exit doors. The Sargent 980 is a removable mullion at 86 inch standard height in extruded aluminum. Where the drawing states Grade 1 mullion hardware and a fire-rated pair, the QRM311 answers that line directly.
10) Is the Stanley QRM311 suitable for residential use?
No, it is commercial hardware. Grade 1 mullions like the QRM311 belong on fire exits, storefront pairs and institutional entrances running rim exit devices, not on a house. Property managers and MRO buyers standardizing a multi-family or commercial building are the right fit for it.
How fast can I get the Stanley Security QRM311 8 689 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 Stanley Security QRM311 8 689 come with a warranty?
Absolutely. The Stanley Security QRM311 8 689 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 Stanley Security QRM311 8 689?
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 Stanley Security QRM311 8 689 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.