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Ives FB31 Automatic Flush Bolts for Metal Doors
Automatic Flush Bolt Solution for Double Metal Door Applications
The Ives FB31 automatic flush bolts deliver fully automatic operation for metal door applications. A 3/4" bolt throw with 7/8" vertical adjustment and 3/4" bolt backset provides reliable engagement with installation flexibility. Standard rod length is 12" from the center of the flush bolt body to the bolt tip. Available as a top-and-bottom pair (FB31P), top bolt only (FB31T), or bottom bolt only (FB31B). Non-handed. For use with metal doors only.
Key Features
- Fully Automatic Operation: Inactive door latches automatically when the active door closes; unlatches when the active door opens — no manual throw required.
- 3/4" Bolt Throw with 7/8" Vertical Adjustment: Accommodates minor misalignment at jamb and threshold strikes without re-mortising.
- No Spring Tension on Top Bolt: Low actuation forces reduce wear and make operation smooth over the life of the hardware.
- 12" Standard Rod Length: Measured from center of flush bolt body to bolt tip; sized for typical metal door applications.
- Non-Handed: Installs on either leaf without handing — simplifies ordering and field inventory.
- ANSI A156.3 Type 25 Compliant: Meets the commercial door hardware standard for automatic flush bolts.
- UL Fire Door Listed: Approved for fire-rated door assemblies — supports code compliance on rated openings.
- Brass or Stainless Steel Substrate: Choose the substrate that matches corrosion and finish requirements for the application.
Technical Specifications
- Model: FB31
- ANSI/BHMA: ANSI A156.3 Type 25
- Bolt Throw: 3/4"
- Vertical Adjustment: 7/8"
- Bolt Backset: 3/4"
- Standard Rod Length: 12" (center of body to bolt tip)
- Body Dimensions: W: 1", L: 6-3/4", D: 2"
- Substrate: Brass or Stainless Steel
- Door Hand Direction: Non-Handed
- Application: Metal doors only
- Commercial/Residential: Commercial
Installation Overview
- Verify door thickness and edge preparation requirements for flush bolt mortising against the Ives installation sheet.
- Use manufacturer templates to mark mounting hole locations on the door edge, aligned with jamb and threshold strike points.
- Rout flush bolt mortise cavities to specified dimensions for both top and bottom bolt assemblies.
- Install flush bolt assemblies in prepared mortises and secure per manufacturer torque specifications.
- Use the 7/8" vertical adjustment to align bolts with jamb and threshold strikes.
- Test automatic operation: close and open the active door to confirm full bolt extension and retraction. Refer to the Ives Full Line Catalog for complete installation details.
Typical Applications
- Commercial office buildings and retail establishments
- Educational facilities and healthcare institutions
- Government and municipal buildings
- Industrial, warehouse, and multi-tenant residential properties
- Fire-rated door assemblies requiring UL-listed hardware
Manufacturer Resources
Ives Full Line Catalog
Product Specs
- Subcategory:
- Flush Bolts and Coordinators
- Product Group:
- Door Trim and Accessories
- Product Subgroup:
- Flush Bolts
- Product Type:
- Flush Bolts
- ANSI/BHMA:
- ANSI A156.3 Type 25
- Commercial/Residential:
- Commercial
- Product Model:
- FB31
- Door Hand Direction:
- Non-Handed
- Product Dimension:
- W: 1", L: 6-3/4", D: 2"
- Product Category:
- Door Trim and Accessories
- Product Substrate:
- Brass or Stainless Steel
- Department:
- Door Hardware
Ives FB31P 12 MD US3 – Frequently Asked Questions
1) What are the Ives FB31 automatic flush bolts used for?
The Ives FB31 automatic flush bolts secure the inactive leaf of double metal doors. They automatically engage when the door closes and retract when the active leaf opens.
2) Are these flush bolts compatible with all metal door types?
The FB31 works with standard hollow metal doors. Verify door thickness and construction before installation. Check manufacturer specifications for compatibility with your specific door frame.
3) How do I determine the correct handing for installation?
Stand facing the outside of the doors. The inactive leaf determines handing. Order right-hand if inactive leaf is on the right, left-hand if on the left.
4) What finishes are available for the FB31 flush bolts?
Standard finishes include US3 bright brass, US4 satin brass, US10B dark bronze, US26D satin chrome, and US32D stainless steel. Custom finishes may be available on request.
5) What is the duty rating for these automatic flush bolts?
The FB31 is designed for heavy-duty commercial applications. Check with manufacturer specifications for specific cycle ratings and load requirements for your installation.
6) Do these flush bolts meet fire door code requirements?
The FB31 can be used on fire-rated assemblies when properly installed. Verify local fire codes and consult fire door labels for approved hardware configurations.
7) What accessories are included with the FB31 flush bolts?
Standard package includes flush bolts, strikes, mounting screws, and installation template. Verify all components are included before beginning installation.
8) What are the basic installation requirements?
Installation requires mortising into the door edge and drilling for strikes. Use manufacturer template for precise measurements. Professional installation recommended for fire-rated doors.
9) How do I adjust the flush bolts after installation?
Adjustment screws allow fine-tuning of bolt projection and spring tension. Make small adjustments and test operation. Lubricate moving parts with light machine oil as needed.
10) Are there similar models available as alternatives?
Other automatic flush bolt options include manual flush bolts or surface-mounted alternatives. Browse our door hardware section for compatible products.
11) What door thickness range do these flush bolts accommodate?
Standard FB31 flush bolts work with most commercial door thicknesses. Verify exact thickness requirements with manufacturer specifications before ordering.
12) What are the key measurements needed for ordering?
Measure door thickness, height, and frame dimensions. Note handing and finish requirements. Confirm clearance for bolt projection into frame head and threshold.
How fast can I get the Ives FB31P 12 MD US3 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 Ives FB31P 12 MD US3 come with a warranty?
Absolutely. The Ives FB31P 12 MD US3 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 Ives FB31P 12 MD US3?
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