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Rockwood 2848 Automatic Flush Bolt with Bottom Fire Bolt for Metal Doors Fire Rated Up to 3 Hours
Model: ROC-2848
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.
Rockwood
Starting at
$193.38
$139.53
ROCKWOOD 2948 Automatic Flush Bolt with Bottom Fire Bolt
Material: Brass, stainless steel;
Finishes: US3, US4, US10, US10B,US10BE, US26, US26D, US32D;
Fastner: 8 ea. #8 x 3/4 " FH combo screws, 2 ea. plastic anchors; 3 ea. #10 x 1" FH WS
Features:
- For Fire Rated Wood 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 1/2"
- For fire rated UL listed 20-minute wood core and composite doors 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:
- 2948
- Product Category:
- Door Trim and Accessories
- Department:
- Door Hardware
Rockwood ROC-2948-US32D – Frequently Asked Questions
1) Does the Rockwood 2948 flush bolt need the floor drilled for a bottom strike?
No floor prep. The 2948 uses a bottom fire bolt instead of a conventional bottom bolt dropping into a floor strike, which is the point of the design: no coring the slab, no threshold strike to keep clear of. That matters on existing openings where the floor is tile, terrazzo, or a poured slab you would rather not touch.
2) Do I have to throw the Rockwood 2948 bolt by hand every time, or is it automatic?
Fully automatic. Opening the active leaf retracts the top bolt on the inactive leaf, and closing it re-engages. Nobody has to reach up and slide a lever, which is why automatic bolts get spec'd on openings the public uses. If you want a bolt that stays thrown until someone deliberately releases it, a manual set like the Ives FB358 or the ABH 1854 fire bolt set is the other approach.
3) Is the Rockwood 2948 for wood doors or hollow metal doors?
Wood doors. The 2948 is prepped and fastened for wood core and composite construction, and it ships with 8 each #8 x 3/4 inch flat head combo screws, 2 plastic anchors, and 3 each #10 x 1 inch flat head wood screws. On a hollow metal pair you want a metal door bolt instead, such as the ABH 1854 fire bolt set or the Ives FB457.
4) What happens if the doors settle and the Rockwood 2948 bolt no longer lines up with the strike?
Two things absorb misalignment. The bolt head rod adjusts up to 1/2 inch, so you can tune engagement without re-prepping the frame, and the bottom fire bolt strike hole is oversized to take slight door misalignment. There is also an override: if the bolt head is blocked from entering the strike, the mechanism gives rather than damaging the door or the bolt.
5) Is a residential brass flush bolt an acceptable substitute for the Rockwood 2948 on a fire rated pair?
No. Bolts such as the Delaney 6 inch square end solid brass flush bolt, the Delaney 7 inch slide type mortise in flush bolt, and the Orca Hardware 6 inch flush bolt with radius corners are manually operated flush bolts for holding an inactive leaf. The Rockwood 2948 is a commercial device intended for fire rated wood doors, with a bottom fire bolt and a thermal lock that automatically locks the inactive door under high heat due to fire. On a rated opening, that fire function is what the inspector is looking for.
6) Can I use a 6 inch flush bolt like the Trimco 3999 in place of the Rockwood 2948?
Those are different devices. The Trimco 3999 is a 6 inch corner mount flushbolt with a rounded end and the 3999SE is the square end version of the same 6 inch corner mount bolt. Both are manually thrown by hand at the bolt. The Rockwood 2948 is automatic - opening the active door retracts the top bolt - and includes a bottom fire bolt with a thermal lock that locks the inactive door under high heat. If the opening calls for an automatic bolt, a manual corner mount bolt does not fill that role.
7) What is the difference between an automatic flush bolt and a key operated flush bolt on a pair of doors?
An automatic bolt like the Rockwood 2948 works off the active leaf: open the active door and the top bolt retracts on its own, so the inactive leaf can be opened without a key or a tool. A cylinder operated flushbolt, such as the Adams Rite 1877 for paired wood doors or the 1870 Series with key control, only releases for someone holding the key. Use the automatic where the inactive leaf has to open freely for egress or for moving equipment through; use the key operated version where you want the inactive leaf locked down and controlled.
8) Do I need to order the bottom fire bolt separately with the Rockwood 2948?
No, the bottom fire bolt is part of the 2948. You get the automatic top bolt and the bottom fire bolt together, along with the fasteners: 8 each #8 x 3/4 inch flat head combo screws, 2 plastic anchors, and 3 each #10 x 1 inch flat head wood screws. What you still need on the opening is the frame strike prep at the head and whatever lock or latch the active leaf carries.
9) I only need the top automatic bolt for a wood door pair - is there an option that is not a full set?
Yes. The Ives FB42 is a top automatic flush bolt for wood doors with an auxiliary fire latch, and it carries a fire rating. That covers the case where the bottom of the inactive leaf is already handled or a separate bottom device is being used. The Rockwood 2948 is supplied as an automatic top bolt together with a bottom fire bolt, which is what lets it skip floor prep on the inactive leaf.
10) What is a simpler manual flush bolt to use where an automatic bolt is not required?
For a wood or metal opening where the inactive leaf can be thrown by hand, the Ives FB358 is a manual flush bolt with a 3/4 inch throw and a 1/2 inch bolt diameter, and the Ives FB457 is a manual flush bolt with a 12 inch rod length for metal doors. Both carry a fire rating. The tradeoff is operation: the Rockwood 2948 retracts its top bolt automatically when the active door is opened, with a maximum 5 lb closing force, while a manual bolt requires someone to reach the lever at the door edge each time.
11) Can I add a bottom fire bolt to an existing pair instead of replacing the whole set with a Rockwood 2948?
The ABH 1858 is a universal bottom fire bolt with manual operation, which addresses the bottom of the inactive leaf on its own. The Rockwood 2948 arrives as a combined assembly - automatic top bolt plus bottom fire bolt - with an oversize fire bolt strike hole that allows for slight door misalignment and a bolt head rod adjustable up to 1/2 inch. Choose by whether you are supplementing existing top hardware or replacing both ends.
12) What is the difference between the Rockwood 2948 and a two-point flushbolt like the Adams Rite MS2180?
The Adams Rite MS2180 Series is an auto-release two-point flushbolt with a Smartlock mechanism, and the MS1880/MS1881 are two-point flushbolts with an interlock mechanism - both throw top and bottom from a single mechanism and are Adams Rite devices typically specified on narrow stile openings. The Rockwood 2948 is an automatic top bolt with a separate bottom fire bolt for wood doors, where the bottom fire bolt removes the need for floor prep and the top bolt retracts when the active leaf opens. Confirm the door construction first, since the 2948 is built for 20-minute wood core and composite doors.
13) I need a single manual flush bolt for a metal door, not a wood door set. What should I order?
The ABH 1855S is a manual flush bolt single for metal doors with a 3/4 inch throw, and the International Door Closers FB-1202 is a flush bolt with a positive U joint actuator, 5/8 inch throw, 1/8 inch offset with 7/8 inch backset, square end, with guide. Both are single manual bolts. The Rockwood 2948 is a wood door assembly and operates automatically off the active leaf, so it is not a match for a single manual metal door application.
14) What is the Rockwood 2948 made of, and will it hold up in a school or hospital corridor?
Brass and stainless steel construction. Rockwood hardware of this kind goes into institutional buildings, offices, retail, educational, detention, sports facilities, and hospitality work, which is the traffic level this bolt is built around. The commercial rating means it is not a light residential slide bolt.
15) Does the Rockwood 2948 come in a satin stainless finish, and how does that compare to what other flush bolt lines offer?
Yes - the Rockwood 2948 is offered in 630 satin stainless steel, and the line is made in brass and stainless steel with finishes including US3, US4, US10, US10B, US10BE, US26, US26D and US32D. Among the alternatives, the Delaney 6 inch square end bolt is a solid brass flush bolt and Emtek offers a flush bolt line, both of which lean toward decorative brass-family openings. If you are matching satin stainless hardware across a commercial pair, the 630 option on the 2948 keeps the pair consistent.
How fast can I get the Rockwood ROC-2948-US32D delivered?
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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 Rockwood ROC-2948-US32D come with a warranty?
Absolutely. The Rockwood ROC-2948-US32D is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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