Lockoffs – What You Need to Know & Which Carseats Have Them


Graco Argos 80 Elite - installed with seatbelt using lockoff

CarseatBlog’s Carseat Lockoff Guide

As LATCH weight limits shrink due to federal standards, more and more carseats require using the seatbelt once the child exceeds a certain weight. The problem with seatbelt installations is that most parents have no idea how to lock the seatbelts in their vehicle in order to properly install a carseat or infant seat base. Ask the average parent or caregiver what a switchable retractor is and you’ll probably get a very confused look in response.

This is why every car seat in North America should come with a built-in lockoff! If you are installing with a seatbelt instead of lower LATCH anchors and your carseat has a lockoff device – use it and you will never have to worry about understanding pre-crash locking features on vehicle restraint systems.

Function of built-in lockoff device: A lockoff device can serve more than one function but its main purpose is to cinch or clamp the seatbelt in such a way that it cannot loosen and your tight carseat installation stays tight!  

2022 List of Carseats that Have Lockoff(s)

Rear-Facing Infant Seats
Baby Jogger City GO 2
Baby Jogger City GO AIR
Britax B-Safe Gen2 | B-Safe Gen2 FlexFit | B-Safe FlexFit+ | Endeavours | B-Safe Ultra
Chicco KeyFit | KeyFit 30 | KeyFit 35
Chicco Fit2 Infant & Toddler
Clek Liing
Evenflo LiteMax | LiteMax DLXSecureMax Infant
Graco SnugRide SnugFit 35 DLX | SnugRide SnugFit 35 DLX featuring Safety Surround | SnugRide SnugFit 35 Elite | SnugRide SnugFit 35 LX
Graco SnugRide 35 LX Click Connect
Graco SnugRide SnugLock (all models)
Maxi-Cosi Coral XP | Mico XP Max
Nuna Pipa | Pipa Lite | Pipa Lite lx | Pipa Lite rx | Pipa Lite r | Pipa rx
Orbit Baby G5 Infant Seat
Peg-Perego Primo Viaggio 4-35 | Primo Viaggio Lounge | Primo Viaggio Nido
Summer Affirm 335
UPPAbaby Mesa
Convertible Seats
Baby Jogger City Turn
Britax AllegianceEmblem
Britax  ClickTight convertibles (all models)
Britax One4Life ClickTight All-in-One
Chicco NextFit SportNextFit Zip | NextFit Zip Max ClearTex | NextFit Zip Max Air
Chicco Fit4 | Fit4 Adapt
Chicco OneFit ClearTex All-in-One
Clek Foonf | Fllo
Graco 4Ever featuring Safety Surround*4Ever DLX* | 4Ever DLX SnugLock | 4Ever Extend2Fit* | 4Ever featuring TrueShield*
Graco SlimFit3 LX* | True3Fit LX*
Graco TrioGrow SnugLock | TrioGrow SnugLock LX
Maxi-Cosi Magellan XP | Magellan XP Max
*forward-facing only lockoff
Forward-Facing Combination Seats
Britax Grow With You ClickTight | Grow With You ClickTight Plus
Chicco MyFit | MyFit Zip | MyFit Zip Air
Graco Nautilus SnugLock
Graco Tranzitions SnugLock

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Lockoffs on Infant Seat Bases

There are different types of lockoffs that require different routing so make sure you are following the directions that came with your carseat. Never assume anything. Below we discuss the two most common types of lockoff systems.

Lockoff just for shoulder belt portion of the lap/shoulder belt

  • Bases with these types of lockoffs will have a lockoff on each side of the base but you only use one lockoff–  on the side where the shoulder belt goes up to the retractor.

keyfit base lockoff


Two lockoffs on base but only use one of them!

Single lockoff device

  • clamps both portions of the seatbelt (lap belt and shoulder belt)

Graco SR35 lockoff



Convertible seats with lockoffs will usually have them for both rear-facing and forward-facing beltpaths

Britax Allegiance and Emblem lockoffs (old-style Britax G4.1)


Original Chicco NextFit lockoffs (just for shoulder belt portion)

nextfitlockoffopen  nextfitlockoffclosed

Clek Foonf & Fllo lockoffs (different types of lockoffs for RF & FF beltpaths)

Clek Fllo FF lockoff Clek Fllo RF lockoffs

Forward-Facing Combination Seats Lockoffs

Nautilus 65 DLX model 


Chicco MyFit (this lockoff design can also be found on all current NextFit convertible seats)

ClickTight Technology (available on certain Britax models): The ClickTight compartment acts as a lockoff too!

Britax Frontier 90 - Desert PalmBritax Advocate CT - open CT compartment stock


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