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Falcon D251 Grade 2 Double Thumbturn Deadbolt with Anti-Saw Protection
Professional Medium-Duty Security Solution
The Falcon D251 double thumbturn deadbolt delivers Grade 2 certified security with solid zinc bolt construction and hardened steel anti-saw pin insert. Featuring adjustable 2-3/8" or 2-3/4" backset with lock-in-place helix design, this medium-duty deadbolt accommodates door thicknesses from 1-3/8" to 2-1/4" and includes metal dustbox reinforcement with three 3" screws for enhanced frame protection.
Professional Features & Benefits
- Adjustable Backset: 2-3/8" or 2-3/4" with lock-in-place helix design for versatile installation requirements.
- Door Thickness Range: Accommodates 1-3/8" to 2-1/4" doors for broad compatibility across commercial applications.
- Anti-Saw Protection: Solid zinc bolt with hardened steel anti-saw pin insert provides enhanced security against forced entry attempts.
- Reinforced Frame Protection: Metal dustbox anchors deep into wood door frames with three 3" screws to protect against kick-in attacks.
- Tamper-Resistant Design: Free-spinning tapered trim ring resists wrenching and prying, while integrated security shield protects bolt from ice-pick attacks.
- Grade 2 Certification: ANSI/BHMA A156.5 Grade 2 certified for medium-duty commercial applications with reliable performance standards.
- ADA Compliant Operation: Thumbturn design meets ADA compliance requirements for accessible operation.
- Fire Rating Available: UL 10C 3-hour fire rated options available when used as auxiliary locks for code compliance applications.
Technical Specifications
- ANSI/BHMA: A156.5, 2001, Grade 2
- Commercial/Residential: Commercial
- Cylinder and Keyways: n/a
- Department: Door Hardware
- Duty Level: Medium Duty
- Electronic: No
- Grade: Grade 2
- Keyed: No
- Keyed Function: Non-Keyed
- Lock Function: Double Thumbturn
- Product Attribute: Deadbolts
- Product Category: Mechanical Locks
- Product Function: Double Thumbturn
- Product Group: Mechanical Locks
- Product Model: D251
- Product Subgroup: Bored Locksets
- Product Type: Deadbolts
- Series: D200 Series
- Standard Strike: Square Corner with metal dust box, 1-1/8" x 2-3/4"
- Subcategory: Deadbolts
Installation & Operation
- Review manufacturer specifications and verify door preparation requirements including door thickness between 1-3/8" and 2-1/4", and backset selection of 2-3/8" or 2-3/4".
- Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for the 1" housing diameter deadbolt.
- Prepare door and frame by drilling required holes including the 1-1/8" x 2-1/4" faceplate mortise and routing as specified in manufacturer instructions.
- Install the metal dustbox reinforcement in the frame with three 3" screws, then mount the deadbolt assembly and strike plate per manufacturer specifications.
- Adjust the lock-in-place helix backset mechanism for proper alignment and verify smooth thumbturn operation on both sides.
- Test deadbolt operation to verify proper 1" throw extension and retraction, and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.
Professional Applications
- Commercial Office Buildings
- Educational Facilities
- Healthcare Institutions
- Retail Establishments
- Industrial and Warehouse Facilities
- Multi-Tenant Residential Properties
- Government and Municipal Buildings
Why Choose Falcon Quality?
Falcon D251 deadbolts deliver professional-grade reliability with solid zinc bolt construction and hardened steel anti-saw pin insert rated for Grade 2 commercial applications. The integrated security features including metal dustbox reinforcement and tamper-resistant trim design provide enhanced protection against common attack methods. BAA compliant construction and available UL 10C fire rating options ensure code compliance for demanding commercial installations where dependable security performance is essential.
Manufacturer Resources
Allegion BAA Compliance catalog
Product Specs
- Series:
- D200 Series
- Subcategory:
- Deadbolts
- Grade:
- Grade 2
- Duty Level:
- Medium Duty
- Keyed:
- No
- Standard Strike:
- Square Corner with metal dust box, 1-1/8" x 2-3/4"
- ANSI/BHMA:
- A156.5, 2001, Grade 2
- Product Group:
- Mechanical Locks
- Product Subgroup:
- Bored Locksets
- Product Type:
- Deadbolts
- Electronic:
- No
- Keyed Function:
- Non-Keyed
- Commercial/Residential:
- Commercial
- Cylinder and Keyways:
- n/a
- Lock Function:
- Double Thumbturn
- Product Attribute:
- Deadbolts
- Product Model:
- D251
- Product Function:
- Double Thumbturn
- Product Category:
- Mechanical Locks
- Department:
- Door Hardware
Falcon D251 626 – Frequently Asked Questions
1) Will the Falcon D251 deadbolt work on a 2-inch thick door?
Yes. The D251 covers door thicknesses from 1-3/8 inches up to 2-1/4 inches, so a 2 inch door is inside its range without a spacer kit. That upper end is unusual for a bored deadbolt, and it's what makes the D251 workable on thick institutional and multi-family doors where a typical residential-range deadbolt tops out at 1-3/4 inches.
2) Does the Falcon D251 need a key, or is it thumbturn on both sides?
Thumbturn on both sides, no cylinder and no key anywhere on it. The D251 is a non-keyed double thumbturn deadbolt, so anyone on either face can throw or retract the bolt by hand. That makes it right for an interior opening, a stockroom, or a connecting door where you want a positive lock but no key control. If you need a key on the outside, this is the wrong function of the D200 Series.
3) Can I use a double thumbturn deadbolt on an exit door?
A thumbturn on the inside means no key is needed to get out, which is the reason the D251 gets specified on egress-side openings, and the thumbturn operation meets ADA requirements. But the outside face is also a thumbturn, so it gives you no key control from the exterior. For a door where the outside must stay locked to non-keyholders, look at a keyed function instead, such as the Arrow E60 Grade 2 exit deadlock, which is blank plate outside by thumbturn inside, or a cylinder by thumbturn deadbolt like the Hager 3215.
4) Does the Falcon D251 fit a 2-3/8 or a 2-3/4 inch backset?
Both. The D251 ships with an adjustable backset that sets to either 2-3/8 or 2-3/4 inches using a lock-in-place helix, so one part covers both of the standard bored-lock backsets. If you're stocking deadbolts for a building with mixed door prep, that's one SKU instead of two.
5) Can I put a Falcon D251 on a fire rated door?
UL 10C 3-hour fire rated options are offered on the D251 when it's used as an auxiliary lock, meaning alongside the primary latching lockset rather than as the only latch on the opening. A deadbolt with no latch does not hold a fire door closed on its own. Confirm the fire rated option is called out on the order if the opening is rated.
6) I need a keyed deadbolt instead of a double thumbturn, what's the closest option?
The D251 is non-keyed by design, so a keyed version means a different product. For the same Grade 2 commercial level with a key outside and a thumbturn inside, the Arrow DBX61 and the Cal-Royal CB160 are both Grade 2 cylinder by thumbturn deadbolts, and the Hager 3115 is Grade 2 cylinder by thumbturn on a Schlage C keyway for 1-3/8 to 1-3/4 inch doors, which matters if you're keying into an existing Schlage system. For key on both sides, the Delaney LU Series is a Grade 2 double cylinder.
7) The Falcon D251 is Grade 2 medium duty - what deadbolt should I specify if the facility requires Grade 1?
The Falcon D251 carries ANSI/BHMA A156.5, 2001, Grade 2 and is rated medium duty. Where a spec calls for Grade 1, the Design Hardware D1 Series is a Grade 1 double cylinder deadbolt rated extra heavy duty for 1-3/4 inch doors, the Dexter DB1000 is a Grade 1 deadbolt available in single cylinder and double cylinder for doors 1-3/8 to 1-7/8 inch, and the Corbin Russwin DL3011 is a Grade 1 cylindrical deadlock covering 1-3/4 to 2-1/4 inch doors. Note that all three are keyed functions, so a Grade 1 upgrade also means moving off double thumbturn operation.
8) I need a deadbolt for a door thicker than 1-3/4 inches - does the Falcon D251 cover it, and what else does?
The Falcon D251 accommodates door thicknesses from 1-3/8 inch to 2-1/4 inch, which covers thick commercial doors that many deadbolts stop short of. Most Grade 2 peers top out at 1-3/4 inch: the Dexter DB2000 in single or double cylinder covers 1-3/8 to 1-3/4 inch, and the Hager 3115 and 3214 both cover 1-3/8 to 1-3/4 inch. Among the keyed options that reach thicker doors, the Corbin Russwin DL3011 Grade 1 cylindrical deadlock covers 1-3/4 to 2-1/4 inch. For an oversized door needing thumbturn operation on both faces, the D251 range is the one to check against the actual door.
9) What is the closest alternative to the Falcon D251 if the door needs a key on the outside instead of a thumbturn on both sides?
The Falcon D251 is a double thumbturn deadbolt, non-keyed, thrown or retracted by turning either side. When the opening needs outside key control, the Arrow DBX61 is a Grade 2 single cylinder deadbolt in a cylinder x thumbturn function, and the Hager 3215 is a Grade 2 commercial deadbolt with a 1 inch throw in cylinder x thumbturn, fitting doors 1-3/8 to 1-3/4 inch. Both put a keyed cylinder outside with a thumbturn inside; the D251 keeps operation manual on both faces, which suits interior and back-of-house doors where nobody should be locked out by a lost key.
10) Which non-keyed deadbolt works like a Falcon D251 but only needs to operate from the inside of an exit door?
The Falcon D251 turns from both faces. On an exit door where the outside face should have no operation at all, the Arrow E60 is a Grade 2 exit deadlock, non-keyed, in a blank plate x thumbturn function for doors 1-3/8 to 1-3/4 inch thick - blank trim outside, thumbturn inside. The Callan 205S is a Grade 3 one-sided half-bore deadbolt, which bores only one face of the door. Choose the D251 when staff need to operate the bolt from either side; choose a blank-plate or one-sided unit when outside operation must be blocked.
11) Is a double cylinder deadbolt the same thing as the Falcon D251 double thumbturn?
No. The Falcon D251 is a double thumbturn: a turn piece on both faces, non-keyed, so it needs no key from either side and meets ADA requirements for accessible operation. A double cylinder deadbolt takes a key on both faces instead - the Delaney LU Series is a Grade 2 double cylinder deadbolt, the Callan 210S is Grade 3 double cylinder, and the Dexter DB2000 double cylinder is Grade 2 for 1-3/8 to 1-3/4 inch doors. Double cylinder units are often restricted on egress doors because occupants need a key to get out; the D251 leaves the inside face free-turning.
12) Can a Falcon D251 be keyed into an existing master key system?
No - the Falcon D251 is non-keyed with no cylinder, so it cannot join a keying system. When the deadbolt has to key alike with the rest of a facility, the Deltana CL200LAIC is a Grade 2 single deadbolt prepped for an interchangeable core with a 2-3/4 inch backset, the Arrow E61 is a Grade 2 single cylinder deadlock with SFIC prep less core for 1-3/8 to 1-3/4 inch doors, and the Delaney LM Series is a Grade 1 single cylinder less core deadbolt in dull chrome US26D. Each takes the core the existing system already uses. The D251 stays the choice where the door should never require a key.
13) Will a mortise deadbolt drop into the same prep as a Falcon D251?
No. The Falcon D251 is a bored deadbolt installed through a 1 inch housing bore with a 1-1/8 inch by 2-1/4 inch faceplate mortise. Mortise deadbolts need a pocket cut into the door edge instead: the Dormakaba D900 is a small case mortise deadbolt in cylinder x thumbturn, the Emtek 2050 and 2051 are European mortise deadbolts with an integrated roller latch in square and round trim, and the DynaLock 1300 Series is a heavy duty mortise electric deadbolt. Swapping between bored and mortise means re-prepping the door, so confirm which prep the existing opening has before ordering.
14) What holes do I need to drill for a Falcon D251 deadbolt?
The D251 uses a 1 inch housing diameter through the door face and a 1-1/8 x 2-1/4 inch faceplate mortise on the door edge for the standard bolt. In the frame, you set the metal dustbox with three 3 inch screws so the anchor reaches past the jamb into the stud. Falcon supplies templates for marking. If you'd rather skip the edge mortise entirely, order the circular drive-in bolt version, which is 626 satin chrome only.
15) What keeps someone from sawing or prying the Falcon D251 off the door?
The bolt is solid zinc with a hardened steel anti-saw pin insert cast into it, so a hacksaw blade skates instead of cutting. The outside trim ring is tapered and free-spinning, which defeats a wrench or pipe grip. There's a security shield over the bolt against ice-pick attack, and the metal dustbox with three 3 inch screws pulls the frame side of the lock into framing rather than just the jamb trim, which is what usually fails in a kick-in.
16) Is the Falcon D251 Buy American Act compliant for a government job?
Yes, the D251 is BAA compliant, which is what lets it onto federal, municipal, and other publicly funded work where domestic-preference sourcing has to be documented. Allegion publishes the BAA listing for Falcon product if your submittal package needs the reference.
17) Do I need to buy a strike and dustbox separately for the Falcon D251?
No. The standard square corner strike with metal dust box, 1-1/8 x 2-3/4 inches, comes with the deadbolt along with the three 3 inch frame screws. You only add a strike line item if you want something other than the standard one, and a separate dust box or a strike reinforcer can be ordered where an existing frame needs building up.
18) What is a lighter-duty alternative to the Falcon D251 for a low-traffic residential-style door?
The Falcon D251 is a Grade 2 commercial deadbolt rated medium duty. On lower-traffic openings, the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with adjustable backset for 1-3/8 to 1-3/4 inch doors, and the Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn over the same thickness range. Both are keyed outside rather than thumbturn on both faces, and both sit a grade below the D251, so match the choice to the cycle count the opening actually sees.
19) What should I use instead of a Falcon D251 if the door needs credential or code access rather than a manual turn?
The Falcon D251 is a mechanical, non-electronic deadbolt. For access-controlled openings, the Codelocks CL2200 is a medium duty electronic surface deadbolt in brushed steel, the Codelocks CL200 is a light duty surface deadbolt with key override, the Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote, and the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override. These change how the door is credentialed; the D251 is the option when the bolt should work with no power and no credential.
20) Which Grade 2 deadbolts are direct peers to the Falcon D251 if I want to standardize a property on one model?
The Falcon D251 is ANSI/BHMA A156.5 Grade 2, commercial, in a double thumbturn function. Peer Grade 2 units include the Arrow DBX61 single cylinder, the Cal-Royal CB160 with a tamper-resistant cylinder guard, the Bravura 310B Elite in a traditional round trim, and the Callan 200S-G2 in a round trim - all cylinder x thumbturn. If the fleet standard is a keyed outside face, those are the like-for-like grade match; if the standard is turn-on-both-sides with no keys to issue, the D251 is the one that holds that function at Grade 2.
21) Is the Arrow 460 or a BEST 8T a substitute for a Falcon D251?
Neither is a complete deadbolt. The Arrow 460 is a mortise lock strike with a straight lip for latchbolt and deadbolt functions - frame hardware only. The BEST 8T is a T Series tubular deadbolt tube component, meaning the bolt assembly rather than a finished lock with trim. The Falcon D251 ships as a complete double thumbturn deadbolt with a square corner strike and metal dust box, 1-1/8 inch by 2-3/4 inch. Order the Arrow or BEST items only when replacing a piece of an existing installation.
22) Which deadbolt should I choose over the Falcon D251 when the classroom function is required?
The Falcon D251 is a double thumbturn with no cylinder, so it cannot provide keyed classroom control. For classroom-function openings, the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway and a 6-pin cylinder for 1-3/8 to 1-3/4 inch doors and carries a fire rating, and the Corbin Russwin DL2211 is a Grade 1 cylindrical deadlock in a cylinder x blank classroom function for 1-3/4 inch doors. Both give a keyed face; the D251 remains appropriate where the room should be secured by turn only.
23) Can I match the Falcon D251 to the finish on the rest of my doors?
Five finishes are made: 605 bright brass, 606 satin brass, 613 satin bronze oil-rubbed, 625 bright chrome, and 626 satin chrome. 626 satin chrome is the usual commercial standard and is the one that lines up with most existing office and institutional hardware. Note that if you want the circular drive-in bolt rather than a mortised faceplate, 626 is the only finish it comes in.
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Does the Falcon D251 626 come with a warranty?
Absolutely. The Falcon D251 626 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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