Stanley Proto J7121 1/2" Square Ext, 7/16" Hex
Product ID: 13308401
Details
- BrandProto
- Item Length6.25 Inches
- MaterialBlend
- Finish TypeBrushed
- Number of Pieces1
🔢Size stamped for quick ID
🛑Ball detent secure fit
⚙️Forged steel durability
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The Stanley Proto J7121 1/2" Square Extension with 7/16" Hex drive is a forged steel, durable tool accessory designed for professional use. Featuring a size stamp for quick identification and a ball detent for secure socket retention, this 6.25-inch extension is lightweight and made in the USA. Ideal for precise, reliable manual applications (not impact), it’s a must-have for any serious toolkit.
| ASIN | B001HWC6A2 |
| Best Sellers Rank | #96,397 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #118 in Hex-Shank Drill Bits |
| Bit Compatibilities | 1/2", 7/16" |
| Brand | Proto |
| Brand Name | Proto |
| Customer Reviews | 4.5 out of 5 stars 867 Reviews |
| Drive Bit Shank Style | Hex with Square Drive |
| Drive System | Hex, Square |
| Finish Type | Brushed |
| Finish Types | Brushed |
| Global Trade Identification Number | 00662679340155 |
| Included Components | 1/2" Square Extension 7/16" Hex |
| Item Length | 6.25 Inches |
| Item Type Name | 1/2" Square Extension 7/16" Hex |
| Item Weight | 0.15 Pounds |
| Manufacturer | Stanley Proto |
| Manufacturer Part Number | J7121 |
| Manufacturer Warranty Description | Manufacturer |
| Material | Alloy Steel |
| Material Type | Alloy Steel |
| Model Number | J7121 |
| Number of Pieces | 1 |
| UPC | 662679340155 |
| Unit Count | 1.0 Count |
G**G
Amazing!
Very solid base. Much better then expected. Only one I was able to find to prevent twisting of base on impact driver.
S**E
As described
Works great
T**W
Great price
works well
S**R
Quality product
I had to remove the protective coating to be able to use in dewalt dcd443 drill. Seems very well built & strong.
H**.
Tough
Not sure how to write this so everyone can picture it in their head. But chucked it up into a 7.5 amp low rpm, high torque drill and screwed together 15 30lbs sub-barrels simultaneously, so basically it handled all the torque of spinning 450lbs of steel from 0 to 600 rpm then slamming to a hard stop when the threads made up. The 1/4 bits kept snapping for the same process, so if you have broken a 1/4 socket adapter I would definitely recommend this product.
B**5
For Milwaukee impact
Work great and well built
C**C
Beefy adapter
I use this regularly at work with a half inch drill and 15/16 socket. So I've broken quite a few 1/4" shank adapters. I don't think this one will ever break. I really like the 7/16" shank on this. The locking stud also is appreciated
K**N
Perfect as always.
I’m a telco lineman and use these to drive sockets with our cordless impact. Have yet to have an issue with any one them.
T**Y
Very pleased
Cheap and works good
A**N
original from proto
the build quality is good, not sure about the hardness. knocking it together on the edge make dent on the hex edges.
A**A
It fits my Dewalt torque wrench
I used it to open my chevy equinox lug nuts to install winter tires and worked perfectly fine. It gets stuck and does not remove from the wrench easily.
E**N
Sturdiness of the Tool
It's Awesome and Perfect for my Job Application
W**E
good for hardware
I use this so that I can use the odd socket to install hardware as a carpender. I do not do automotive so don't know if this is good on cars.
Trustpilot
3 weeks ago
4 days ago