Kwikset 158SQT Square Deadbolt...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$78.20
$52.78
Kwikset 158SQT Square Deadbolt, Halifax Keyed Entry Single Cylinder Deadbolt with SmartKey(SMT)

Kwikset 158SQT Square Deadbolt, Halifax Keyed Entry Single Cylinder Deadbolt with SmartKey(SMT)

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Model: 158SQT-15S
From the Halifax Collection
$78.20
$52.78
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$78.20
$52.78
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Kwikset 158SQT Halifax Square Single Cylinder Deadbolt with SmartKey Security

The Kwikset 158SQT is a single cylinder deadbolt in the Halifax collection, featuring a square-corner contemporary profile. Keyed entry on the exterior operates a 1" throw bolt; a thumbturn on the interior locks and unlocks without a key. SmartKey Security lets you re-key the cylinder in seconds using the included tool, without removing the lock from the door.

Rated ANSI/BHMA Grade 2 for residential applications. Fits doors 1-3/8" to 1-3/4" thick with an adjustable backset of 2-3/8" or 2-3/4". Handing is reversible. Installs with a screwdriver; no special tools required. Backed by a limited lifetime finish and limited lifetime mechanical warranty.

Key Specifications

  • Function: Single cylinder (keyed exterior, thumbturn interior)
  • ANSI/BHMA Grade: Grade 2
  • Latch Throw: 1"
  • Backset: Adjustable 2-3/8" or 2-3/4"
  • Door Thickness: 1-3/8" to 1-3/4"
  • Handing: Reversible
  • Cylinder: SmartKey Security (re-keyable without lock removal)
  • Strike: 1" round corner, 2-1/4" faceplate
  • UL Fire Rating: Optional UL 1/3-hour fire rating available
  • Warranty: Limited lifetime finish; limited lifetime mechanical
  • Available Finishes: Venetian Bronze (510), Satin Nickel (619), Satin Chrome (626), Polished Chrome (625), Matte Black (622)

Resources & Downloads

158SQT SMT Halifax Deadbolt Installation Guide
Kwikset Halifax Deadbolt Sell Sheet
SmartKey Re-Keying Instructions

Manufacturer Resources

Product Specs

Series:
Signature Series
Collection:
Halifax
Grade:
Grade 2
Warranty:
Limited Lifetime Finish, Limited Lifetime Mechanical
ANSI/BHMA:
ANSI/BHMA Grade 2
Product Group:
Mechanical Locks
Product Subgroup:
Deadbolts
Subcategory:
Deadbolts
Latch Throw:
1"
Keyed Function:
Single Cylinder
Commercial/Residential:
Residential
Keyed:
Yes
UL Listing Type:
Optional UL 1/3 Hour fire rating for all functions.
Lock Function:
Entry
Cylinder and Keyways:
SmartKey Security
Features:
SmartKey
Product Attribute:
Deadbolts
Standard Strike:
1" - 2-1/4" Round Corner Strike
Backset (Distance):
Adjustable 2-3/8 or 2-3/4
Product Function:
Cylinder x Thumbturn
Product Type:
Deadbolts
Door Hand Direction:
Reversible
Door Thickness Range:
1-3/8" to 1-3/4"
Product Details:
Mechanical
Product Style:
Contemporary
Product Category:
Mechanical Locks
Department:
Door Hardware

Kwikset 158SQT-15S – Frequently Asked Questions

1) Is the Kwikset 158SQT Halifax deadbolt rated for a commercial door?
It is an ANSI/BHMA Grade 2 deadbolt catalogued for residential use. That is right for apartments, single family entries, and light multi-family doors. For a commercial opening taking heavy daily traffic, step up to a Grade 1 single cylinder deadbolt such as the Dexter DB1000 Series or the Delaney LM Series, or a Grade 1 cylindrical deadlock like the Corbin Russwin DL3011 for a 1-3/4 to 2-1/4 inch commercial door.
2) Will the Kwikset 158SQT deadbolt latch into the strike plate already in my door frame?
The 158SQT throws a 1 inch bolt and ships with a 1 inch round corner strike on a 2-1/4 inch faceplate. If the frame already has a round corner strike of that size with a full 1 inch deep pocket behind it, the bolt drops straight in. If the existing strike is square corner or the mortise is shallow, use the strike supplied with the lock and re-chisel the jamb, otherwise the bolt will only project part way and you lose the security the 1 inch throw is there for.
3) Can I key the Kwikset 158SQT to match the deadbolts already on my other units?
Yes, in two ways. On the order you choose Keyed Different or Keyed Alike, and there is a field to enter a specific key code if you are matching an existing system. Beyond that, the cylinder is SmartKey Security, so you can re-key it yourself in seconds with the included tool without pulling the lock off the door. For a property manager rotating tenants or consolidating a mixed set of keys across a building, that is the whole point of this cylinder: you standardize after install, not before.
4) Should I use a single cylinder or double cylinder deadbolt on a door with glass next to it?
The 158SQT is single cylinder: key outside, thumbturn inside. That is the safer choice for egress because anyone inside can get out without hunting for a key, and it is what most residential code expects. Where there is glazing within reach of the thumbturn and the risk is someone breaking the glass and turning it, a double cylinder needs a key on both sides. If you go that route, ZenSupply carries the Dexter DB2000 Grade 2 double cylinder, the Delaney LU Series Grade 2 double cylinder, and the Baldwin Reserve Double Cylinder Contemporary Square Deadbolt if you want to keep the square trim look. Check your local egress rules first, since double cylinder is restricted in some jurisdictions.
5) Is the Kwikset 158SQT a drop-in replacement for the deadbolt already on my door?
In most residential cases yes, because the 158SQT installs into the standard tubular deadbolt prep, adjusts to either the 2-3/8 or 2-3/4 backset already bored, and covers the 1-3/8 to 1-3/4 door thickness range. Installation is three steps with a screwdriver: latch into the edge bore, deadbolt body over it, strike into the jamb. Where it will not drop in is a door prepped for a mortise deadbolt or an interconnected lock, since those are a different cut in the door entirely.
6) What is the closest Grade 2 single cylinder deadbolt to the Kwikset 158SQT Halifax if a square contemporary trim is required?
The Bravura 310SC Elite is a Grade 2 contemporary square deadbolt with cylinder x thumbturn operation, the same function the 158SQT uses - keyed outside, thumbturn inside. The Brinks Mendocino E2402 is another contemporary square single cylinder deadbolt with cylinder x thumbturn function. Both hold the square-corner look of the Halifax square trim; the difference is the cylinder, since the 158SQT carries SmartKey Security and the Bravura and Brinks units do not list it.
7) The opening needs a Grade 1 deadbolt instead of Grade 2 - what single cylinder options carry cylinder x thumbturn?
The Kwikset 158SQT is Grade 2 and rated for residential use, so a Grade 1 spec calls for a different lock. The Dexter DB1000 single cylinder deadbolt is Grade 1 with cylinder x thumbturn function and fits doors 1-3/8 inch to 1-7/8 inch. The Accentra D111 is a Grade 1 single cylinder deadbolt with cylinder x thumbturn function fitting 1-3/8 inch to 1-3/4 inch doors on a 2-3/8 inch backset. Deltana CL200LM is a Grade 1 single cylinder deadbolt with the same function, and the Delaney LM Series is a Grade 1 single cylinder less-core deadbolt for jobs that take an owner-supplied cylinder.
8) What should be used instead of the Kwikset 158SQT on a door where a key is required from both sides?
The 158SQT is a single cylinder deadbolt - keyed exterior with a thumbturn inside - so it cannot be keyed on both faces. For a double cylinder opening, the Dexter DB2000 double cylinder deadbolt is Grade 2 and fits 1-3/8 inch to 1-3/4 inch doors, matching the 158SQT door thickness range. The Hager 3214 is a Grade 2 double cylinder deadbolt with a Schlage C keyway for the same thickness range. Delaney LU Series is a Grade 2 double cylinder deadbolt, and Callan 210S is a Grade 3 double cylinder deadbolt. For a contemporary square face, the Baldwin Reserve DC.CSD is a double cylinder contemporary square deadbolt.
9) Is the Cal-Royal ED500 or LSD a substitute for the Kwikset 158SQT Halifax deadbolt?
Both are single cylinder deadbolts with cylinder x thumbturn function that fit 1-3/8 inch to 1-3/4 inch doors, the same range the 158SQT covers, so either will go into the same bore and door. The distinction is the rating: the Cal-Royal ED500 and LSD are Grade 3, while the 158SQT is ANSI/BHMA Grade 2. The LSD adds an ADA ergonomic thumbturn, which matters where the turn piece has to be operable without tight grasping. If the spec calls for Grade 2, the Cal-Royal CB160 is the Grade 2 single cylinder deadbolt in that line and adds a tamper-resistant cylinder guard.
10) The 158SQT keys to SmartKey - what deadbolt should be ordered instead to key into an existing Schlage C system?
The Kwikset 158SQT uses a SmartKey Security cylinder, which is its own keying platform. To key a deadbolt into an existing Schlage C master or maison system, the Hager 3215 is a Grade 2 single cylinder deadbolt with a 1 inch throw and a Schlage C keyway, fitting 1-3/8 inch to 1-3/4 inch doors - the same throw and door range as the 158SQT. Hager 3115 is also a Grade 2 cylinder x thumbturn deadbolt with the Schlage C keyway for that thickness range. For a small-format interchangeable core house key system, the Arrow E61 is a Grade 2 single cylinder deadlock with SFIC prep less core for 1-3/8 inch to 1-3/4 inch doors, and Deltana CL200LAIC is a Grade 2 cylinder x thumbturn deadbolt built for an interchangeable core.
11) What deadbolt takes the place of a Kwikset 158SQT on an exit door that must never be keyed from the outside?
The 158SQT is a keyed entry deadbolt with a cylinder on the exterior face. On an exit-only door where no outside key is wanted, the Arrow E60 is a Grade 2 non-keyed exit deadlock with blank plate outside and thumbturn inside, fitting 1-3/8 inch to 1-3/4 inch doors - the same door range the 158SQT covers. The Callan 205S is a Grade 3 one-sided half-bore deadbolt for a door with no through-bore on the outside face. Where the outside must be keyed but the inside carries no turn piece, the Corbin Russwin DL3011 is a Grade 1 cylindrical deadlock, cylinder x blank, for 1-3/4 inch to 2-1/4 inch doors.
12) The door is thicker than 1-3/4 inches - which deadbolt covers it if the Kwikset 158SQT does not?
The 158SQT fits doors 1-3/8 inch to 1-3/4 inch thick. Above that, the Corbin Russwin DL3011 Grade 1 cylindrical deadlock covers 1-3/4 inch to 2-1/4 inch doors. The Deltana 7312KA2 is a Grade 3 double cylinder deadbolt covering 1-3/8 inch to 2 inch doors, and the Dexter DB1000 Grade 1 single cylinder deadbolt covers 1-3/8 inch to 1-7/8 inch - useful on a slab that measures a shade over standard.
13) Do the Emtek 2050 or Codelocks CL200 work as a drop-in replacement for a Kwikset 158SQT?
No - they are different lock formats. The 158SQT is a bored tubular deadbolt installed with a screwdriver on an adjustable 2-3/8 or 2-3/4 inch backset with a 1 inch throw and a 1 inch by 2-1/4 inch round corner strike. The Emtek 2050 is a European mortise deadbolt with an integrated roller latch in a square trim, which requires a mortise pocket in the door edge rather than a bored hole. The Codelocks CL200 is a surface deadbolt with key override, mounted on the face of the door. The Dormakaba D900 is a small case mortise deadbolt, also mortise prep. Swapping to any of these changes the door prep, so they suit new doors or doors already mortised, not a straight retrofit of a bored deadbolt.
14) For a heavy traffic commercial opening, what carries more duty than a Kwikset 158SQT single cylinder deadbolt?
The 158SQT is rated Grade 2 for residential applications. Stepping up, the Cal-Royal CRB800 is a Grade 1 heavy duty single cylinder deadbolt with a UL 3-hour fire rated latch and cylinder x thumbturn function. The Falcon D111 is a Grade 1 heavy duty deadbolt in the D100 Series with an adjustable backset. The Design Hardware D1 Series is an extra heavy duty Grade 1 double cylinder deadbolt for 1-3/4 inch doors, for openings that also need a key on both faces.
15) Do I need to order the Kwikset 158SQT handed for a left or right hand door?
No handing to specify. The 158SQT is reversible and a deadbolt has no lever or latch bevel to orient, so one part number covers left and right hand openings and inswing or outswing. That matters if you are buying a batch for a building: you order quantity, not a hand split.
16) I need a square contemporary deadbolt but not a Kwikset. What else is there?
Two close matches in square trim: the Bravura 310SC Elite is a Grade 2 contemporary square deadbolt, cylinder x thumbturn, and the Callan 200S is the same square trim shape at Grade 3. Both are single cylinder like the 158SQT. What neither gives you is the SmartKey cylinder, so if the reason you want the Kwikset is self re-keying on turnover, the substitutes are trim-equivalent but not function-equivalent.
17) Do I need to buy anything else to install the Kwikset 158SQT deadbolt?
No extra hardware for a normal install. The 158SQT comes with the adjustable latch, the 1 inch round corner strike with 2-1/4 inch faceplate, mounting screws, keys, and the SmartKey reset tool for re-keying. A screwdriver is the only tool. If the door has no deadbolt bore yet you will need a 2-1/8 inch hole saw and a 1 inch spade bit for the edge, which are not supplied.
18) Can I re-key the Kwikset 158SQT myself when a tenant moves out?
Yes, and without taking the lock off the door. SmartKey Security lets you reset the cylinder to a new key in seconds using the included tool, so turnover on a unit is a two minute job at the door instead of a locksmith call or a lock swap. Across a portfolio that is the practical difference between this deadbolt and a conventional pin tumbler cylinder, which has to be pulled and pinned to a new bitting.
19) What is the difference between the Kwikset 158SQT and the Falcon D211 classroom deadbolt?
Both are Grade 2 deadbolts with cylinder x thumbturn function, so at a glance they read as the same lock. The Falcon D211 is a classroom function deadbolt in the medium duty D200 Series, and the Falcon D111 is the Grade 1 classroom version in the heavy duty D100 Series with an adjustable backset. The 158SQT is an entry function residential deadbolt with SmartKey Security and a reversible, adjustable 2-3/8 or 2-3/4 inch backset. Classroom function is specified where the door has to be secured or released by key on a schedule; entry function with a thumbturn is specified where an occupant on the inside needs to throw the bolt without a key.
20) Which deadbolts are an alternative to the Kwikset 158SQT when the round trim is wanted instead of the square?
The 158SQT Halifax carries a square-corner contemporary trim. For the same cylinder x thumbturn function in a round face, the Bravura 310RC Elite is a Grade 2 contemporary round deadbolt and the Bravura 310B Elite is the Grade 2 traditional round version. The Callan 200S-G2 is a Grade 2 single cylinder round trim deadbolt, and the Brinks Raleigh E2401 is a transitional round single cylinder deadbolt with a 4-way adjustable backset. All four run cylinder x thumbturn, the same function as the 158SQT.
21) What replaces the Kwikset 158SQT if the unit needs keypad or electronic access instead of a key?
The 158SQT is a mechanical deadbolt with a keyed cylinder and thumbturn. Where codes or credentials are wanted in the same deadbolt footprint, the Delaney KP400 is a Grade 2 electronic deadbolt with a programmable remote. The Codelocks CL2200 is a medium duty electronic surface deadbolt, and the CL2210 is the electronic mortise version. For multifamily credential systems, the Dormakaba Saffire LX-D is an RFID electronic deadbolt with BLE and electronic lock override, and the Dormakaba Nova-D is an RFID multihousing smart electronic deadbolt.
22) Is a deadbolt like the Kwikset 158SQT the right part for a door that also needs a latching knob or lever?
The 158SQT is a deadbolt only - a 1 inch throw bolt operated by key outside and thumbturn inside, with no latch to hold the door closed. It is paired with a separate knob or lever on the same door. Where a single interconnected unit is preferred, the Falcon H2101 is a Grade 2 entrance interconnected lock with a single cylinder deadbolt built into it, so the deadbolt and the latching trim retract together. Baldwin Estates 8011 is a contemporary 1-5/8 inch double cylinder deadbolt in entrance function for a door that takes a key on both faces alongside its own trim.
23) Which single cylinder deadbolts should be considered against the Kwikset 158SQT when the backset is fixed at 2-3/4 inches?
The 158SQT ships with an adjustable backset that sets to either 2-3/8 or 2-3/4 inches, so it covers a 2-3/4 inch bore without a separate part number. If a fixed 2-3/4 inch unit is preferred, the Deltana CL200LA is a Grade 2 single deadbolt with a 2-3/4 inch backset and cylinder x thumbturn function. Where the bore is 2-3/8 inch, the Accentra D111 is a Grade 1 single cylinder deadbolt with a 2-3/8 inch backset. The Brinks Mendocino E2402 and Raleigh E2401 both use a 4-way adjustable backset.
24) Which Grade 2 deadbolts compare to the Kwikset 158SQT for standardizing across a portfolio of doors?
The 158SQT is Grade 2 with cylinder x thumbturn function, an adjustable 2-3/8 or 2-3/4 inch backset, reversible handing, and a SmartKey cylinder that re-keys without pulling the lock - which is what makes it practical to rotate keys unit by unit across a fleet. Comparable Grade 2 single cylinder units include the Arrow DBX61 with cylinder x thumbturn function, the Dexter DB2000 single cylinder for 1-3/8 inch to 1-3/4 inch doors, the Bravura Rectangle single cylinder deadbolt, and the Cal-Royal CB160 with a tamper-resistant cylinder guard. Those alternates do not carry SmartKey, so a re-key means pulling the cylinder.
25) What finishes does the Kwikset 158SQT Halifax deadbolt come in?
Five: Venetian Bronze (510), Satin Nickel (619), Satin Chrome (626), Polished Chrome (625), and Matte Black (622). If you are matching a building already standardized on a finish, those numbers are the Kwikset finish codes to quote against your existing hardware schedule. The trim is a square contemporary profile, so it pairs with square rose knobs and levers rather than round colonial trim.
How fast can I get the Kwikset 158SQT-15S 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 158SQT-15S come with a warranty?
Absolutely. The Kwikset 158SQT-15S 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 158SQT-15S?
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 158SQT-15S from ZenSupply?
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