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ROCKWOOD 2848 Automatic Flush Bolt with Bottom Fire Bolt
Material: Brass, stainless steel;
Finishes: US3, US4, US10, US10B,US10BE, US26, US26D, US32D;
Fastner: 10 ea. #8 x 3/4" FH combo screws, 4 ea. plastic anchors
Features:
- For Fire Rated Metal Doors
- Low (5 lbs. maximum) closing force
- Fully automatic—opening active door retracts top bolt
- Override feature prevents damage to doors or bolt if bolt head is blocked from entering strike
- Bolt head rod is adjustable up to 1-1/2"
- For fire rated metal doors labeled A, B, C, D, & E up to 4' w x 9' h
- Thermal lock automatically locks the inactive door under high heat conditions due to fire
- Bottom fire bolt eliminates need for floor prep
- Oversize fire bolt strike hole allows for slight door misalignment
ROCKWOOD OVERVIEW
Rockwood products are normally used on all types of institutional buildings, offices, retail, educational, detention, sports facilities, hotel and restaurant, and finer residences.
ENVIRONMENTAL MANAGEMENT
ASSA ABLOY is commited to protecting the quality of the environment as well as the health and safety of its employees, customers, and the community. Please see our Environmental Health and Safety Policy for details on how we are dedicated to this commitment.
RESOURCES & DOWNLOADS
Manufacturer Resources
Product Specs
- Product Group:
- Door Trim and Accessories
- Subcategory:
- Bolts and Latches
- Product Subgroup:
- Flush Bolts
- Product Type:
- Flush Bolts
- Commercial/Residential:
- Commercial
- Product Model:
- 2848
- Product Category:
- Door Trim and Accessories
- Department:
- Door Hardware
Rockwood 2848 US32D – Frequently Asked Questions
1) Do I have to core drill the floor for a bottom bolt with the Rockwood 2848?
No floor prep needed. The 2848 uses a bottom fire bolt rather than a bolt that drops into a floor strike, so there's nothing to cut into the slab or the threshold. The fire bolt strike hole is oversized as well, which takes up slight misalignment between the leaves.
2) My inactive leaf is out of alignment and the top bolt keeps hanging up. Will the Rockwood 2848 handle that?
Two things on the 2848 cover it. The bolt head rod is adjustable up to 1-1/2 inches, so you can dial the top bolt to reach the frame strike after the frame has settled or the door has sagged. And there's an override built in: if the bolt head is blocked from entering the strike, the mechanism gives rather than damaging the door or the bolt.
3) What is the closest automatic flush bolt to the Rockwood 2848 for a fire rated metal door pair?
The ABH 1860P/1862P automatic flush bolt pair is the nearest match. Like the Rockwood 2848, it is an automatic flush bolt arrangement rated for 3 hours with a thermal lock, so the inactive leaf self-locks under fire conditions. The Rockwood 2848 is an automatic flush bolt with a bottom fire bolt for metal doors, fire rated up to 3 hours, where opening the active door retracts the top bolt and the bottom fire bolt removes the need for floor prep.
4) If the doors are wood rather than metal, what automatic flush bolt takes the place of the Rockwood 2848?
Use the Ives FB41 automatic flush bolt set for wood doors, which has a 3/4 inch throw and a 90 minute fire rating. For a top bolt only on a wood pair, the Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch. The Rockwood 2848 is built for fire rated metal doors, so a wood pair needs one of the wood-door sets instead.
5) Automatic or manual flush bolts on a fire rated pair, which do I need?
Automatic bolts like the Rockwood 2848 retract the top bolt whenever the active leaf swings open, so the inactive leaf frees itself without anyone reaching for it. That's what egress codes generally push you toward on a pair with a fire label. Manual bolts require someone to throw and release them by hand and are usually specified where the inactive leaf is meant to stay fixed. If manual is what your spec calls for on metal doors, the ABH 1854 Series manual flush bolt set with fire bolt or the Ives FB457 with 12 inch rod cover that.
6) Does the Rockwood 2848 come with the screws and anchors, or do I need to buy fasteners separately?
Fasteners are in the box: 10 each #8 x 3/4 inch flat head combo screws and 4 plastic anchors. What isn't included is the frame strike prep, so plan on the strike work at the head as part of the install.
7) Is there another automatic flush bolt with a thermal lock besides the Rockwood 2848?
The ABH 1860P/1862P automatic flush bolt pair is the closest cross-brand equivalent we carry, fire rated 3-hour with a thermal lock like the 2848. Both are automatic sets for a fire rated pair. If you only need to replace the bottom fire bolt and not the whole set, ABH also lists the 1858 universal bottom fire bolt.
8) Can I use the Rockwood 2848 on a non-rated pair, or on decorative wood doors?
On a non-rated pair of metal doors the 2848 works, though you're paying for a fire bolt you don't need. It is not the part for wood doors. For plain surface or mortise flush bolts on wood or decorative openings, the Delaney 6 inch square end solid brass flush bolt, the Delaney 7 inch slide type mortise flush bolt, or a Trimco 3999 6 inch corner mount are the right family.
9) When does a key-operated flushbolt make more sense than the Rockwood 2848?
When the inactive leaf must be secured or released under key control rather than automatically. The Adams Rite 1870 Series is a cylinder-operated flushbolt with key control, and the Adams Rite 1877 is a cylinder-operated flushbolt for paired wood doors. The Rockwood 2848 has no cylinder; it operates automatically off the active leaf and holds the inactive door with a thermal lock under fire conditions.
10) Which flush bolt should be specified for an opening where the bolt must land in a floor strike with some door misalignment?
The Rockwood 2848 handles that at the sill without floor prep: its bottom fire bolt eliminates the need for floor prep and its oversize fire bolt strike hole allows for slight door misalignment. Where a conventional bottom bolt is wanted instead, the ABH 1858 is a universal bottom fire bolt of manual operation and the Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors.
11) What two-point flushbolt options exist for an aluminum storefront pair rather than the Rockwood 2848?
The Adams Rite MS1880/MS1881 are two-point flushbolts with an interlock mechanism, and the Adams Rite MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism. Both engage top and bottom as a two-point set. The Rockwood 2848 is an automatic flush bolt with a bottom fire bolt intended for fire rated metal doors.
12) Are the Delaney and Emtek flush bolts an equivalent to the Rockwood 2848?
They serve a different kind of opening. The Delaney 7 inch slide type mortise-in flush bolt, the Delaney 6 inch square end solid brass flush bolt, the Delaney 7 inch mortise extension flush bolt, and the Emtek flush bolts are hand-operated mortise-in bolts. The Rockwood 2848 is a fully automatic bolt with a bottom fire bolt, a low 5 pound maximum closing force, and an override feature that prevents damage to the door or bolt if the bolt head is blocked from entering the strike.
13) What finishes does the Rockwood 2848 flush bolt come in?
Two orderable finishes on the 2848: 626 satin chrome and 630 satin stainless steel. Both are standard on commercial openings, and 630 is the usual match when the rest of the pair's hardware is stainless. Rockwood publishes the 2848 in a wider finish range (US3, US4, US10, US10B, US10BE, US26, US26D, US32D), but 626 and 630 are the two stocked here.
14) What is the Rockwood 2848 actually made of, and will it hold up in a school or hospital corridor?
Brass and stainless steel construction, and Rockwood hardware of this kind is normally put into institutional buildings, offices, retail, schools, detention, sports facilities, hotels and restaurants. Ordered in 630 satin stainless it's the usual choice for wet or high-wear corridors.
15) Which manual metal-door flush bolts state a 3/4 inch throw if a single bolt is all the opening needs?
The ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, and the Ives FB358 is a manual flush bolt with a 3/4 inch throw and a 1/2 inch bolt diameter. Each is a single hand-operated bolt. The Rockwood 2848 is an automatic set whose bolt head rod is adjustable up to 1-1/2 inches and whose bottom fire bolt eliminates the need for floor prep.
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Does the Rockwood 2848 US32D come with a warranty?
Absolutely. The Rockwood 2848 US32D is backed by a manufacturer’s warranty.
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