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Masterlock ULock Key - Black - image 1 of 4
Masterlock ULock Key - Black - image 2 of 4
Masterlock ULock Key - Black - image 3 of 4
Masterlock ULock Key - Black - image 4 of 4
Masterlock ULock Key - Black - image 1 of 4
$16.99 when purchased online

About this item


  • Outdoor heavy duty bike u-lock is best used as a bicycle lock
  • Hardened steel u-shaped lock body resists cutting, sawing and prying
  • Double locking shackle for superior pry resistance; Protective vinyl coating helps prevent scratching
  • Bike lock body is 7-1/4 in. (18 cm) wide, with 8 in. (20 cm) long shackle and 1/2 in. (13 mm) shackle diameter
  • Includes one u-lock bike lock, two keys


The Master Lock 8320D U-Lock Bike Lock with Key features a 7-1/4 in. (18 cm) wide hardened steel body for maximum strength and reliability. The 1/2 in. (13 mm) diameter double locking shackle is 8 in. (20 cm) long and made of hardened steel, offering extra resistance to prying, cutting, and sawing. The disc key cylinder prevents picking. The Lifetime Guarantee provides peace of mind from a brand you know and can trust.
Overall Width: 5.0 Inches
Weight: 2.0 Pounds
Warranty: No Applicable Warranty. To obtain a copy of the manufacturer's or supplier's warranty for this item prior to purchasing the item, please call Target Guest Services at 1-800-591-3869
TCIN: 13592034
UPC: 716492052556
Item Number (DPCI): 082-01-0768
Origin: Imported
If the item details above aren’t accurate or complete, we want to know about it.

Shipping details

Estimated ship dimensions: 9.8 inches length x 7.42 inches width x 1.35 inches height
Estimated ship weight: 2.15 pounds

Return details

This item can be returned to any Target store or Target.com.
This item must be returned within 90 days of the date it was purchased in store, shipped, delivered by a Shipt shopper, or made ready for pickup.
See the return policy for complete information.

Q: Does it come with a bracket to mount it to the frame?

submitted by Jon - 2 months ago
  • A: Yes, this model does come with the mounting bracket.

    submitted byMasterLockCompany - 2 months ago
    Brand expert

Q: Can i check out as a guest ?

submitted by Mike - 9 months ago
3.2 out of 5 stars with 38 reviews
0% would recommend
1 recommendations
quality: 1.33 out of 5
value: 1.67 out of 5

Not worth it

1 out of 5 stars
Thumbs down graphic, would not recommend
Na - 23 days ago, Verified purchaser
The lock continues to get jammed. The key gets stuck.
1 reply from MasterLockCompany team - 22 days ago
We appreciate your feedback and apologize for your inconvenient experience with this product. For more information regarding this product, or any others from Master Lock, please contact our Customer Support at 800-464-2088 US, 1-800-227-9599 CAN
quality: 1 out of 5
value: 1 out of 5
Did you find this review helpful?

Poor Quality for security.

1 out of 5 stars
Dan - 10 years ago
I purchased the Master U Lock back in '09 and it was working fine with no problem. Well, after a year of use the locking mechanism was "sticking" as many have listed above. I dealt with it as best I could. The final give was when it popped open and fell off my bicycle frame while it was locked to it on the way home. I hate carrying locks so I lock 'em to the frame but I was so embarrassed that it popped open and fell off I just left it on the road. Sorry for littering. Master lock make better products please. To potential buyers, Kryptonite makes durable products. Since then I've purchase a lock form Trimax. No complaints yet and very durable. Be sure you DON'T buy any lock with cylinder keys. They can and WILL be opened by a plastic BIC pen. Thanks You tube for that one. Hope my review helped.
quality: 2 out of 5
value: 5 out of 5
23 guests found this review helpful. Did you?

bad lock

1 out of 5 stars
marv - 10 years ago
bought one of these now the key doesnt work so i cant unlock my bike.
quality: 1 out of 5
value: 1 out of 5
9 guests found this review helpful. Did you?

bike got stolen

1 out of 5 stars
steve - 11 years ago
I was using a bulky chain and a padlock prior. I just switched to this feeling that it would be pretty safe parked outside the honors dorm at my university and my bike got stolen with it locked up using just this lock. For security, I can not say it is very good. Other comments, the lock rusted over 6 months, but still worked fine and the key was a bit off but worked alright
quality: 1 out of 5
value: 2 out of 5
14 guests found this review helpful. Did you?

Keys do not open lock PLEASE DO NOT BUY

1 out of 5 stars
David - 12 years ago
I tried this lock for the first time and the keys do not open the lock. Keys also feel very flimsy, so even if they did open the lock they would likely break. Pacific Cycle customer service number did not connect to anyone who could help and just asked if I had an extension number. Please do not buy this lock to encourage Target to stop carrying such inferior products.
quality: 1 out of 5
value: 1 out of 5
9 guests found this review helpful. Did you?


1 out of 5 stars
Jenny - 12 years ago
The key broke off into the lock the first time I tried to use it. Key NOT durable at all. Don't buy this product. Go to a local bike shop and buy one. It's not like the older, durable version that I used to have. This one is terrible. Returning it tomorrow.
quality: 1 out of 5
value: 1 out of 5
9 guests found this review helpful. Did you?

cheap keys

1 out of 5 stars
gabby - 12 years ago
key broke in the lock a week after purchase
quality: 1 out of 5
value: 1 out of 5
9 guests found this review helpful. Did you?

Stolen Bike

1 out of 5 stars
Mark - 12 years ago
My bike was stolen as a result of this product. It was destroyed using something like bolt/rebar cutter and the company offered no service. I highly discourage purchasing Master Lock NO. 8170D.
quality: 1 out of 5
value: 1 out of 5
10 guests found this review helpful. Did you?


1 out of 5 stars
Adam - 12 years ago
Like the other reviewers, ours broke in about a month or two. Which is weird because I have an older version of this from 5 or 6 years ago that is bullet proof. Rain, snow, mud, just keeps working. This new design is terrible though.
quality: 1 out of 5
value: 1 out of 5
8 guests found this review helpful. Did you?

Been using for years

4 out of 5 stars
Onsted - 12 years ago
I have used this product for several years with no problem. It mounts on the bike when not using. Just don't lose the key.
quality: 4 out of 5
value: 4 out of 5
4 guests found this review helpful. Did you?

cheap and malfunctions

1 out of 5 stars
mary - 12 years ago
I got 3 of these for 3 bikes and every one of them froze up after a few months of use. The keys do not work and we did not get them mixed up. The bikes were in separate locations, like dorms and cities. The keys would start to 'stick' so I recommended everyone go EZ on the locks. Then, each lock began to have the same problem - the key would not open the lock - either it would not turn or it would turn but the lock would not pop open! A disaster! Missed appointments and classes. I went to a local bike shop here in Cambridge and the guy showed me how bad the locks were - they were EZ to pop with a pen. I am taking all 3 back but I doubt I will get a refund -past dates - but Target should junk this lock. I can't be the only person with this problem!
quality: 1 out of 5
value: 1 out of 5
12 guests found this review helpful. Did you?

Not worth the money if your bike gets stolen only days after purchase!!

1 out of 5 stars
Chris - 12 years ago
I purchased this lock and happily involved in owning my new bike only a few days ago. I chose it because it was the most expensive and durable looking one they had at the store. I figured they would need a blow torch to get it off. Imagine my disappointment when I came out after work to find my bike and lock gone. I made sure the lock was securly on and figured that it would be safe on busy Clark street with lots of police and foot traffic passing by, leading me to wonder how easy it is to tamper with this lock. My advice is to purchase a much better lock at a local bike store.
quality: 1 out of 5
value: 1 out of 5
11 guests found this review helpful. Did you?

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