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Patent pending power tool resistant SAF Tech design and geometry deters angle grinder blades up to 5 inches. Hardened cast steel for increased hardness, strength, ductility and toughness will withstand repeated brute force attacks.

Unique anti-drill design prevents direct attacks to internal lock body and locking mechanism

Premium high security disc detainer lock is extremely pick resistant

Easy to grip cap seals out moisture and debris for additional extreme weatherproofing
1 Trailer Coupler Lock
4 High quality disc detainer keys
20.1 lbs
7.25" x 6" x 5.5"
Fits most standard OEM flat lip design trailer couplers
> for additional fit guidance see below <
The quality and peace of mind that comes with this lock is hard to put a price on. It keeps my airstream safe and sound. Big fan!
It was a little expensive but we'll worth the money.
My trailer is parked outside and makes me a little nervous knowing someone could hitch it up and take it away while I'm in bed. Sleeping easier now knowing there's not a chance.
See what our customers are saying
from 203 reviewsThe quality and peace of mind that comes with this lock is hard to put a price on. It keeps my airstream safe and sound. Big fan!

It was a little expensive but we'll worth the money.

My trailer is parked outside and makes me a little nervous knowing someone could hitch it up and take it away while I'm in bed. Sleeping easier now knowing there's not a chance.

If Apple made a trailer lock, this would be the one. Excellent design and quality!

After years of using a different brand, I saw this one. SO MUCH EASIER to install. Ordering the carrying bag to tie a bow on it. Thanks -

This lock is amazing, it is huge and built to destroy. I love it.
I leave my bicycle in front of my work the whole day and feel so good about not to have to worried that my bike will be stolen.
I m glad I found and bought the SAF lock.

This lock appears to be bullet proof so to speak, just seeing it is enough to discourage 90% of thieves in my opinion.

Why do I buy a $350 lock to protect my Airstream even if my insurance already cover theft lost? It’s just for the peace of mind. Knowing it’s protected by the safest lock on the market makes me feel safe.

Omg. This lock is by far the best lock I have ever used. Superior quality, superior materials, and superior strength. Need I say more. You will not regret this purchase for piece of mind.

Has always been worried about utility trailer theft but not now with this heavy duty lock

This thing is MONSTROUS! Like 20lbs of raw, "come steal me, bro!", in your face, masculinity. I had to upgrade my truck just to pack this thing around when I wasn't using it. I dropped it once and it broke the driveway, it's that tough. I almost want someone to try to steal my trailer just so I can watch them struggle with this massive hunk of steel and awesomeness. It's so intimidating, I'm scared to take it off my own trailer! ZERO worries about miscreant mother-RVers walking away with my rig. Spendy, but worth it in piece of mind.

Arrived and was more impressive in person than on the website. Wonderful product and if things go good will be ordering many more

This lock is extremely impressive!! I researched until my finger tips bled on keyboard . Had an order set to go with its toughest more well known puck style lock but the easy drilling out of that turns me to hit order now the SAF. It also happens to be HAF, Heavy As F’k. This is definitely beyond proven to me a hell of lock. Get yours now and quit worrying and enjoy the security is done in regards to getting your ball locked up safely. I’d say it’d be safe in the dead of the woods on my camper !

FIT Guidance
for 2 5/16" Couplers




The SAF 2516 fits most SAE Class I-IV rated A-frame and channel mount couplers designed for 2-5/16" hitch balls.
Note: The SAF 2516 is designed to secure 2 5/16" couplers with a flat lip design as found on these popular brands.
See below for additional fit guidance.


Standard A-frame Coupler

Standard Channel Mount Coupler

"Demco" Coupler
For Airstream Owners:



2020 Airstreams and newer have standard 2 5/16" flat lip couplers that are compatible with the SAF Trailer Lock.
We recommend that if you do replace the rolled lip coupler on your camper, have a certified welder or have your Camper Service Mechanic install a coupler with the noted flat lip design referenced above.
The SAF 2516 Trailer Lock DOES NOT fit the following 2 5/16" coupler style:

Sleeve-lock style

Rolled Lip A-frame coupler

Cast steel A-frame style

Under-style A frame coupler

Straight tongue coupler

Yoke latch coupler style
Q. Is it possible to order different (or multiple) SAF Trailer locks and use the same key for all of them?
A. Yes, it is possible to order the SAF Trailer Lock keyed alike. Please choose this option in the drop down menu when placing your order, or contact us if you want a large corporate order to secure your fleet of trailers. Please allow additional time for shipping and handling for your custom order.
Q. How do I know the SAF Trailer Lock will fit my coupler?
A. The SAF Trailer Lock has been test fitted with most common coupler locks available. The SAF Trailer Lock is designed to work couplers with a flared lip. Please review the above fit guidance to compare and ensure your coupler is compatible. If your don't see your style of coupler, please email info@altorlocks.com with an image of your coupler.
The Altor SAF2516 Trailer Lock is the first power tool proof trailer lock!
Thieves using power tools is the new normal. If you do not have this lock, your trailer and its cargo are vulnerable to being stolen in seconds. The SAF 2516 features Altor's patent pending SAF Tech, a radial finned structure formed from a premium hardened alloy steel that is too thick to be penetrated by angle grinders so hard it destroys reciprocating saw blades, and shock resistant enough to withstand repeated blows from a sledge hammer ensuring that you have the ultimate peace of mind that your trailer is safe.
In addition to being the most secure trailer lock on the market the SAF 2516 is the most weather proof trailer lock on the market. Designed with extreme weatherproofing, this means that the SAF 2516’s high security disc detainer mechanism is encased in a stainless steel lock body that will not corrode from the elements. For additional level of protection the SAF 2516 has an internal dynamic seal and weatherproofing cap that form an airtight seal ensuring that no corrosion causing moisture or mechanism seizing dust enter your lock mechanism.
Lastly the SAF 2516’s one piece design installs in seconds. Simple and easy!
Features and benefits:
- Patent pending power tool resistant SAF Tech.
- SAF Tech Geometry can't be penetrated by angle grinders up to 5”
- Premium hardened alloy steel destroys reciprocating saw blades and drill bits rendering them useless
- Tough enough to withstand repeated attacks from sledge hammers and pry bars
- Extreme weather proofing for maximum life span and reliability.
- All stainless steel lock body for maximum corrosion resistance
- Dynamic mechanism seal prevents corrosion causing moisture from damaging the mechanism
- Weather Proofing Cap prevents dust and debris compromising the locks reliability
- High security disc detainer lock mechanism
- One piece design installs in seconds
- Fits most common 2-5/16” couplers with a flat lip (See coupler fit guide)
Package Includes:
- 1 SAF Trailer Lock
- 4 high security disc detainer keys
Weight: 20.1 lbs
SAF TECH FEATURES AND BENEFITS
Defends and protects against these attacks

ANGLE GRINDER
Altor's patent pending SAF Tech Design's unique radial fin and a specialized formulation of hardened cast steel destroys the cutting edge on angle grinder blades up to five inches.

RECIPROCATING SAW
Physical properties of our hardened steel is incredibly tough and quickly dulls and breaks saw blade teeth rendering them useless and ineffective against our SAFTech.

DRILL + HOLE SAW
The lock mechanism is designed with an anti-drill feature where drill bits and hole saws cannot dig in and have no leverage, spinning in place.

BRUTE FORCE
Our hardened cast steel design and specialized formulation will withstand brute force attacks from pry bars, crowbars and sledge hammers.

PICK RESISTANT
Our disc detainer locks have multiple disc tumblers making the lock highly secure and incredibly pick resistant. Per Lock Picking Lawyer, "This lock is un-pickable on the street." (link to youtube)

WEATHERPROOF
The easy-to-grip safety cap and series of internal seals lock out moisture, dust, mud, and debris, from the lock body, preventing corrosion and internal lock mechanism jams and freezing.
Installation is a snap, installs in seconds.
SIMPLE INSTALLATION

Juggling not necessary

Step 1
Remove cap and insert key. Turn key to the unlock position.

Step 2
Place the SAF Trailer Lock onto your coupler. Turn key to the lock position.

Step 3
Secure cap. Enjoy Peace of Mind.
The SAF Trailer Lock vs Reciprocating Saw
The SAF Trailer Lock vs Drilling and Hole Saw
The SAF Trailer Lock vs Brute Force