Kwikset 660-SMT-CP SmartKey Ro...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$31.00
$24.05
Kwikset 660-SMT-CP SmartKey Round Single Cylinder Deadbolt with Thumbturn, Round Corner Adjustable Deadbolt, Round Corner Strike, In Clear Pack

Kwikset 660-SMT-CP SmartKey Round Single Cylinder Deadbolt with Thumbturn, Round Corner Adjustable Deadbolt, Round Corner Strike, In Clear Pack

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Model: 660-26D-SMT-KA6-CP
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Kwikset 660-SMT-CP SmartKey Round Single Cylinder Deadbolt with Thumbturn, Round Corner Adjustable Deadbolt, Round Corner Strike, In Clear Pack

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 660-26D-SMT-KA6-CP – Frequently Asked Questions

1) Does the Kwikset 660 deadbolt work with a 2-3/8 inch or 2-3/4 inch backset?
Both. The Kwikset 660 ships with the RCAL adjustable latch, so the same bolt covers the two standard residential backsets without ordering a separate latch. Set it before you drop the bolt into the cross bore.
2) Can I key the Kwikset 660 to match the Kwikset locks already on my other doors?
Yes. The 660 uses the Kwikset K3 (KW1-style) keyway, so it keys alike with other Kwikset cylinders on the same keyway. Because it is a SmartKey cylinder, you can also re-key it yourself in seconds with the existing key and a SmartKey tool, no locksmith and no removing it from the door. That is the feature property managers use to re-key a unit between tenants.
3) Is the Kwikset 660 a single cylinder or double cylinder deadbolt?
Single cylinder: key on the outside, thumbturn on the inside. If you have glass within reach of the bolt and your local code allows a keyed inside cylinder, you would want a double cylinder instead, such as the Callan Model 210S or the Dexter DB2000 double cylinder.
4) Is the Kwikset 660 deadbolt suitable for a commercial opening?
It is built as a residential deadbolt, so for apartment interiors, single family and light rental use it is the right part. For a commercial or institutional door where a Grade 1 or Grade 2 deadbolt is specified, look at the Accentra D111 Grade 1, the Arrow DBX61 Grade 2, or the Cal-Royal CB160 Grade 2 instead.
5) Will the Kwikset 660 fit the existing holes if I am replacing an old deadbolt?
In most cases yes. The 660 is a tubular deadbolt built for the standard door prep and installs with the hardware in the pack, and the adjustable latch covers either common backset, so a straight swap on an already bored door usually needs no new drilling. If the old bolt was a mortise type rather than a bored tubular one, that is a different prep and this will not drop in.
6) What is the closest equivalent to the Kwikset 660 SmartKey deadbolt from another brand with a round single cylinder body and adjustable backset?
The Brinks Raleigh Series E2401 is the nearest match in form: a transitional round single cylinder deadbolt with a 4-way adjustable backset, operating cylinder outside and thumbturn inside, the same arrangement as the Kwikset 660. The Bravura 310RC Elite is another round single cylinder deadbolt with cylinder x thumbturn function and a Grade 2 rating. The difference is re-keying: the 660 carries SmartKey, which lets you re-key the lock on the door, while the Brinks and Bravura units are conventional keyed cylinders.
7) The Kwikset 660 is a residential deadbolt - what should I spec instead for a commercial opening that needs a Grade 1 lock?
The Kwikset 660 is catalogued for residential use. For a commercial opening needing Grade 1, the Accentra D111 is a Grade 1 single cylinder deadbolt with a 2-3/8 inch backset and a 1-3/8 to 1-3/4 inch door thickness range, and the Dexter DB1000-SCT is a Grade 1 single cylinder deadbolt covering 1-3/8 to 1-7/8 inch doors. Both use the same cylinder x thumbturn operation as the 660.
8) I need a deadbolt keyed on both sides instead of a thumbturn - what replaces the Kwikset 660?
The Kwikset 660 is a single cylinder unit, key outside and thumbturn inside, so it cannot be converted to double keyed. For a double cylinder opening, the Dexter DB2000-DCT is a Grade 2 double cylinder deadbolt for 1-3/8 to 1-3/4 inch doors, the Delaney LU Series 320601 is a Grade 2 double cylinder deadbolt in US32D, and the Baldwin Reserve DC.CRD gives a contemporary round double cylinder body if you want the round trim shape the 660 uses.
9) Can the Kwikset 660 be used on a fire rated door opening?
For an opening where a fire rating is called out, the Hager 3215 is a Grade 2 single cylinder deadbolt with a 1 inch throw and a fire rating, fitting 1-3/8 to 1-3/4 inch doors, and the Hager 3115 is a fire rated cylinder x thumbturn deadbolt in the Schlage C keyway over the same door thickness range. The Kwikset 660 uses the K3 keyway and is built for residential exterior doors.
10) My master key system runs on Schlage C or an interchangeable core - is the Kwikset 660 the wrong lock for that?
The Kwikset 660 uses the K3 keyway and re-keys through SmartKey, so it will not accept a Schlage C key or an interchangeable core. For a Schlage C system, the Hager 3115 is a cylinder x thumbturn deadbolt in the Schlage C keyway and the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C 6-pin cylinder. For SFIC, the Arrow E61 26D IC is a Grade 2 single cylinder deadlock with SFIC prep less core, the Deltana CL200LAIC is a Grade 2 single deadbolt for an interchangeable core with a 2-3/4 inch backset, and the Delaney LM Series 301702 is a Grade 1 less core deadbolt.
11) What strikes come in the box with the Kwikset 660 deadbolt?
You get dual RCS round corner strikes plus a 5303 full lip strike. The round corner strikes drop into a door frame already prepped with a radius corner mortise, which is what most metal frames and factory prepped wood jambs have. The full lip strike is there when you need the extra bearing surface on a square cut jamb.
12) Does the SmartKey cylinder on the Kwikset 660 help against picking and bumping?
That is the point of the SmartKey cylinder on the 660. Kwikset states it gives protection against lock picking and bumping in addition to the owner re-keying feature. It is a residential-grade security package, not a commercial deadlock.
13) I need a deadbolt with an easier thumbturn for residents with limited grip. Is this it?
The Kwikset 660 uses a standard round thumbturn. If you need an ergonomic turn for accessibility, the Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn that fits 1-3/8 to 1-3/4 inch doors.
14) The Kwikset 660 fits a standard 2-1/8 inch bore - what do I use on a door with no existing deadbolt bore or a mortise prep?
The Kwikset 660 installs into a standard tubular deadbolt prep with its RCAL adjustable latch. If the door is not bored through, the Callan 205S is a Grade 3 one-sided half-bore deadbolt. For a mortise prep, the Dormakaba D900 is a small case mortise deadbolt with cylinder x thumbturn function, and the Emtek 2051 is a European mortise deadbolt with an integrated roller latch in a round trim.
15) Is a Codelocks CL200 or an electronic deadbolt a drop-in substitute for the Kwikset 660?
They solve a different problem. The Kwikset 660 is a keyed mechanical deadbolt with a thumbturn that re-keys via SmartKey. The Codelocks CL200 is a light duty surface deadbolt with keypad entry and key override, so it mounts on the door face rather than in a bored deadbolt prep. 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 electronic lock override. Choose those when you want codes or credentials rather than keys.
16) I want a square trim deadbolt rather than the round Kwikset 660 - what are the options?
The Kwikset 660 uses round trim with a round corner strike. For square trim in the same single cylinder cylinder x thumbturn arrangement, the Bravura 310SC Elite is a Grade 2 contemporary square deadbolt, the Callan 200S is a Grade 3 single cylinder square trim deadbolt, and the Brinks Mendocino E2402 is a contemporary square single cylinder deadbolt with 4-way adjustable backset.
17) The Kwikset 660 thumbturn is hard for some residents to operate - is there a deadbolt with an easier turn?
The Cal-Royal LSD is a Grade 3 single cylinder deadbolt with an ADA ergonomic thumbturn, fitting doors 1-3/8 to 1-3/4 inch thick, and it keeps the same cylinder outside and thumbturn inside operation as the Kwikset 660. If you also want adjustable backset like the 660 RCAL latch, the Cal-Royal ED500 is a Grade 3 single cylinder deadbolt with adjustable backset across the same door thickness range.
18) For rental turnovers I re-key constantly - what else besides the Kwikset 660 lets me change keys without a locksmith?
The Kwikset 660 carries SmartKey, which re-keys the cylinder on the door in seconds. Among alternatives that avoid pinning, the Arrow E61 26D IC takes a small format interchangeable core that swaps out without removing the lock, as does the Deltana CL200LAIC, a Grade 2 single deadbolt built for an interchangeable core with a 2-3/4 inch backset. The trade-off is that the IC route requires cores and a control key, while SmartKey uses the existing Kwikset K3 keys.
19) What deadbolt should I use on a classroom or school door instead of the Kwikset 660?
The Kwikset 660 is a residential deadbolt. For classroom function, the Falcon D111 is a Grade 1 heavy duty classroom deadbolt with adjustable backset, the Falcon D211 is the Grade 2 medium duty classroom equivalent, and the Hager 3118 is a Grade 1 classroom deadbolt with a Schlage C 6-pin cylinder for doors 1-3/8 to 1-3/4 inch thick.
20) Is the Arrow 460 strike or the BEST 8T tube a replacement part for the Kwikset 660?
No. The Kwikset 660 ships as a complete deadbolt with its RCAL adjustable latch, dual RCS round corner strikes and a 5303 full lip strike. The Arrow 460 is a mortise lock strike with a straight lip for latchbolt and deadbolt functions, and the BEST 8T is a tubular deadbolt tube component from the T Series - both are pieces for other lock platforms, not parts that fit the 660. Likewise the Baldwin 8BR0618001 is a deadbolt spacer for a double cylinder Reserve lock.
21) I need a deadbolt for a thick door - the Kwikset 660 is sized for standard residential doors. What covers heavier stock?
For doors above standard residential thickness, the Corbin Russwin DL3011 is a Grade 1 cylindrical deadlock covering 1-3/4 to 2-1/4 inch doors, and the Deltana 7312KA2 is a Grade 3 heavy duty double cylinder deadbolt rated 1-3/8 to 2 inch. If you only need a little more than 1-3/4, the Dexter DB1000-SCT is a Grade 1 single cylinder deadbolt for 1-3/8 to 1-7/8 inch doors and keeps the cylinder x thumbturn operation of the Kwikset 660.
22) What is a step up from the Kwikset 660 if I want a heavier deadbolt but the same key-outside thumbturn-inside operation?
Several peers keep cylinder x thumbturn operation with heavier construction: the Cal-Royal CRB800 is a heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch, the Deltana CL200LM is a Grade 1 single cylinder deadbolt, and the Cal-Royal CB160 is a Grade 2 single cylinder deadbolt with a tamper-resistant cylinder guard. All three use a keyed cylinder rather than the SmartKey re-keyable cylinder on the Kwikset 660.
23) I need a non-keyed thumbturn deadbolt on an interior or exit door - is the Kwikset 660 right?
The Kwikset 660 is keyed on the exterior side, so it is more lock than a non-keyed opening needs. The Arrow E60 is a Grade 2 exit deadlock, non-keyed, with blank plate outside and thumbturn inside, fitting doors 1-3/8 to 1-3/4 inch thick. The Corbin Russwin DL2211 is a Grade 1 cylindrical deadlock with cylinder x blank for a 1-3/4 inch door if you want the keyed side without an inside turn.
24) What finishes does the Kwikset 660 SmartKey deadbolt come in?
Three: satin nickel, satin chrome and antique brass. Satin nickel is the usual match for existing brushed nickel levers and knobs, satin chrome reads cooler and brighter, antique brass suits darker traditional trim.
How fast can I get the Kwikset 660-26D-SMT-KA6-CP delivered?
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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 660-26D-SMT-KA6-CP come with a warranty?
Absolutely. The Kwikset 660-26D-SMT-KA6-CP 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 660-26D-SMT-KA6-CP?
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