Kwikset 660-SMT-RFAL Round Sin...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$39.70
$20.67
Kwikset 660-SMT-RFAL Round Single Cylinder Deadbolt SmartKey with Round Face Adjustable Latch and Round Corner Strike

Kwikset 660-SMT-RFAL Round Single Cylinder Deadbolt SmartKey with Round Face Adjustable Latch and Round Corner Strike

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Model: 660-3-SMT-RFAL-RCS
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$39.70
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Kwikset 660-SMT-RFAL Round Single Cylinder Deadbolt SmartKey with Round Face Adjustable Latch and Round Corner Strike

The Kwikset 660 Single Cylinder Deadbolt delivers reliable security with the convenience of SmartKey Security™, allowing you to re-key your lock in seconds without removing it from the door. Perfect for exterior doors, this deadbolt offers superior protection against lock picking and bumping while maintaining a sleek, classic design that fits any home style.

Features & Benefits:

  • Single cylinder deadbolt – operated by key outside and thumb turn inside

  • SmartKey Security™ – re-key your lock quickly without a locksmith

  • RCAL adjustable latch – fits multiple backset configurations

  • Dual RCS round corner strikes – for a secure, snug fit

  • 5303 full lip strike – added strength and durability

  • K3 keyway – compatible with Kwikset keys for easy keying options

  • Durable construction – built to withstand daily use and harsh conditions

  • Easy installation – fits standard door preps with included hardware

The Kwikset 660 Single Cylinder Deadbolt is a proven choice for homeowners who want both security and convenience without compromising style.

RESOURCES & DOWNLOADS

Kwikset 660-SMT-CP Smart Key Round Single Cylinder Deadbolt with Thumbturn, Round Corner Adjustable Deadbolt, Round Corner Strike

Manufacturer Resources

Product Specs

Product Group:
Mechanical Locks
Product Subgroup:
Deadbolts
Subcategory:
Deadbolts
Commercial/Residential:
Residential
Product Features:
SmartKey
Product Attribute:
Deadbolts
Product Type:
Deadbolts
Product Category:
Mechanical Locks
Department:
Door Hardware

Kwikset 660-3-SMT-RFAL-RCS – Frequently Asked Questions

1) Does the Kwikset 660 deadbolt fit a 2-3/8 inch or a 2-3/4 inch backset?
Both. The Kwikset 660 SmartKey deadbolt ships with the RCAL adjustable latch, which covers the two standard residential backsets without swapping parts. That is why it works on doors already bored for either prep, and why it is a safe stocking item if the bores in a building are not consistent.
2) What is SmartKey on the Kwikset 660 and can I re-key it myself?
SmartKey lets you re-key the 660 deadbolt in place, on the door, without pulling the lock or calling a locksmith. For a landlord turning a unit between tenants, that means a key change in seconds instead of a service call or a cylinder swap. Kwikset also cites SmartKey for added resistance to picking and bumping.
3) Is the Kwikset 660 keyed alike to my other Kwikset locks?
The 660 uses the K3 keyway, which is Kwikset's standard keyway, so it accepts Kwikset keys. With SmartKey you can re-key the deadbolt on the door to match an existing Kwikset key, which is how most people key a whole house or a unit to one key.
4) Is this a single cylinder or double cylinder deadbolt?
Single cylinder. The Kwikset 660 takes a key on the outside and a thumbturn on the inside. If your door has glass beside or within it and your local code or insurer calls for a key on both sides, you need a double cylinder instead, such as the Callan Model 210S or the Dexter DB2000 double cylinder.
5) Can I use the Kwikset 660 deadbolt on a commercial building entrance?
The 660 is classed as residential hardware. For apartment unit doors, single family rentals and interior-to-garage doors it is the right kind of lock. For a commercial opening where a spec calls out an ANSI grade, look at a Grade 1 or Grade 2 commercial deadbolt instead, such as the Accentra D111 Grade 1 or the Arrow DBX61 Grade 2.
6) What is a Grade 1 alternative to the Kwikset 660 single cylinder deadbolt for a commercial opening?
The Kwikset 660 is a residential-rated single cylinder deadbolt. For a commercial opening where a Grade 1 bolt is specified, the Accentra D111 is a Grade 1 cylinder x thumbturn deadbolt with a 2-3/8 inch backset that fits doors 1-3/8 inch to 1-3/4 inch thick, and the Dexter DB1000-SCT is a Grade 1 single cylinder deadbolt covering 1-3/8 inch to 1-7/8 inch door thickness. Both keep the same key-outside, turn-inside operation as the 660.
7) Which deadbolt should I use instead of the Kwikset 660 if the door has no key on the outside?
The Kwikset 660 is keyed outside with a thumbturn inside, so it is not the part for an unkeyed opening. The Arrow E60 is a Grade 2 exit deadlock with a blank plate on the outside and a thumbturn inside, for doors 1-3/8 inch to 1-3/4 inch thick. The Callan 205S is a Grade 3 one-sided half-bore deadbolt, which suits a door bored on one face only.
8) What is the closest match to the Kwikset 660 if I need keying on both sides of the door?
The Kwikset 660 is single cylinder only, so glass-adjacent doors that call for a key both sides need a different part. The Dexter DB2000-DCT is a Grade 2 double cylinder deadbolt for doors 1-3/8 inch to 1-3/4 inch thick, the Dexter DB1000-DCT is the Grade 1 double cylinder version covering 1-3/8 inch to 1-7/8 inch, and the Delaney LU Series 320601 is a Grade 2 double cylinder deadbolt in a US32D stainless steel finish.
9) Which other single cylinder deadbolts have an adjustable backset like the Kwikset 660?
The Kwikset 660 ships with an RCAL adjustable latch that fits multiple backset configurations. Comparable adjustable-backset single cylinder deadbolts include the Brinks Raleigh E2401 round deadbolt and the Brinks Mendocino E2402 square deadbolt, both with 4-way adjustable backset and cylinder x thumbturn function, and the Cal-Royal ED500, a Grade 3 adjustable-backset deadbolt for doors 1-3/8 inch to 1-3/4 inch thick. The Falcon D111 is a Grade 1 heavy duty adjustable-backset deadbolt for commercial work.
10) The Kwikset 660 uses a K3 keyway. What deadbolt do I use if the building is keyed to Schlage C?
The Kwikset 660 has a K3 keyway and takes Kwikset keys. On a property already keyed to Schlage C, the Hager 3215 is a single cylinder deadbolt with a 1 inch throw and a Schlage C keyway for doors 1-3/8 inch to 1-3/4 inch thick, and the Hager 3115 is a Grade 2 cylinder x thumbturn deadbolt with the same keyway and door thickness range. Both are fire rated.
11) Can I use the Kwikset 660 on a facility standardized to small format interchangeable core?
The Kwikset 660 is built around SmartKey re-keying with a K3 keyway, not an interchangeable core. For an SFIC program, the Arrow E61 is a Grade 2 single cylinder deadlock supplied with SFIC prep less core for doors 1-3/8 inch to 1-3/4 inch thick, the Deltana CL200LAIC is a Grade 2 single cylinder deadbolt with interchangeable core less cylinder on a 2-3/4 inch backset, and the Delaney LM Series 301702 is a Grade 1 single cylinder less core deadbolt in US26D.
12) Which deadbolt works instead of the Kwikset 660 on a door thicker than 1-3/4 inch?
For thicker doors, the Corbin Russwin DL3011 cylindrical deadlock is a Grade 1 deadbolt rated for 1-3/4 inch to 2-1/4 inch door thickness, and the Deltana 7312KA2 double cylinder deadbolt covers 1-3/8 inch to 2 inch. The Dexter DB1000 single cylinder runs 1-3/8 inch to 1-7/8 inch if the door is only slightly over standard.
13) Do I need to drill a new hole to install the Kwikset 660?
No, on a door already prepped for a standard tubular deadbolt. The 660 is a tubular deadbolt that mounts into standard door prep with the hardware in the box, and the adjustable latch handles either common backset, so a straight swap of an older deadbolt normally needs no new boring.
14) I need a deadbolt for a fire rated apartment entry door. Is the Kwikset 660 the right pick?
Fire rated hardware is an option choice on the 660 rather than standard, so it has to be specified when you order. If your spec sheet calls out a fire rated deadbolt explicitly, a commercial option like the Cal-Royal CRB800 with its UL 3-hour fire rated latch or a Hager 3215 is the more direct match.
15) What else could I buy instead of the Kwikset 660 if I want an adjustable backset deadbolt from a different brand?
The closest alternatives with adjustable backset are the Brinks Raleigh Series round single cylinder deadbolt and the Brinks Mendocino Series square version, both with 4-way adjustable backset and key-outside, thumbturn-inside operation. The Cal-Royal ED500 is another adjustable backset single cylinder deadbolt and is rated Grade 3 for 1-3/8 to 1-3/4 inch doors. None of those carry SmartKey re-keying, which is the 660's main differentiator.
16) Is the Arrow 460 strike a replacement for the strikes that come with the Kwikset 660?
No. The Kwikset 660 includes dual RCS round corner strikes and a 5303 full lip strike sized to its own bolt and prep. The Arrow 460 is a mortise lock strike for latchbolt and deadbolt functions with a straight lip on 1-3/4 inch doors, which is strike hardware for a mortise lock case rather than a round corner strike for a tubular deadbolt.
17) I want the same round trim look as the Kwikset 660 but in a different brand. What matches?
The Kwikset 660 uses a round face and round trim with a single cylinder outside and thumbturn inside. Round-trim equivalents include the Bravura 310B Elite traditional round deadbolt and the 310RC Elite contemporary round deadbolt, both Grade 2 cylinder x thumbturn, and the Callan 200S-G2, a Grade 2 single cylinder round trim deadbolt. If the opening calls for square trim instead, the Bravura 310SC Elite is the Grade 2 square-trim counterpart.
18) What is the difference between the Kwikset 660 and an electronic deadbolt like the Delaney KP400?
The Kwikset 660 is a mechanical single cylinder deadbolt keyed outside and turned by thumbturn inside, with SmartKey re-keying. The Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote, and the Codelocks CL200 is a surface-mounted deadbolt with key override. Those are code or credential driven openings; the 660 requires a physical key each time from the outside.
19) What deadbolt should I specify instead of the Kwikset 660 for a classroom function opening?
The Kwikset 660 is a standard single cylinder residential deadbolt and does not offer a classroom function. For classroom deadlocks, the Falcon D111 is Grade 1 heavy duty with an adjustable backset, the Falcon D211 is the Grade 2 medium duty single cylinder version, and the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C keyway and 6-pin cylinder for doors 1-3/8 inch to 1-3/4 inch thick.
20) Is the Baldwin Reserve double cylinder round deadbolt the same thing as the Kwikset 660 round deadbolt?
They share a round trim shape but not the function. The Kwikset 660 is single cylinder, keyed outside with a thumbturn inside. The Baldwin Reserve contemporary round deadbolt is a double cylinder unit requiring a key on both faces, as is the Baldwin Reserve contemporary square version. If you want the thumbturn inside, the 660 or another cylinder x thumbturn model is the correct pick.
21) What single cylinder deadbolt has an ADA-friendly thumbturn compared to the Kwikset 660?
The Kwikset 660 uses a standard thumbturn on the inside. If the opening calls for an easier grip, the Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn for doors 1-3/8 inch to 1-3/4 inch thick, with the same cylinder x thumbturn operation.
22) Which deadbolt has a tamper-resistant cylinder guard as an alternative to the Kwikset 660 SmartKey?
The Kwikset 660 resists picking and bumping through its SmartKey cylinder. If the concern is physical attack on the cylinder face instead, the Cal-Royal CB160 is a Grade 2 single cylinder deadbolt with a tamper-resistant cylinder guard, and the Cal-Royal CRB800 is a heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch.
23) What finishes does the Kwikset 660 SmartKey deadbolt come in?
Four: Satin Nickel, Satin Chrome, Polished Brass and Black. Satin Nickel is the usual choice for matching existing residential trim across a portfolio; Black pairs with contemporary matte exterior hardware.
24) Is the round trim on the Kwikset 660 going to look right next to square modern hardware?
The 660 has round face trim and a round corner latch face, which is the traditional profile. If the rest of the door hardware is squared off, a square trim deadbolt reads better, for example the Bravura 310SC Elite or the Callan 200S square trim deadbolt.
How fast can I get the Kwikset 660-3-SMT-RFAL-RCS 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 Kwikset 660-3-SMT-RFAL-RCS come with a warranty?
Absolutely. The Kwikset 660-3-SMT-RFAL-RCS 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 Kwikset 660-3-SMT-RFAL-RCS?
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 Kwikset 660-3-SMT-RFAL-RCS from ZenSupply?
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