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Terminal Block ScrewdriverMerchant Video
  • Klein Tools 612-4 Terminal Block Screwdriver
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Klein Tools 612-4 Terminal Block Screwdriver

4.8 out of 5 stars 2,118 ratings

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Purchase options and add-ons

Brand KLEIN TOOLS
Number of Items 1
Head style Flat
Material Alloy Steel
Colour Black
Special feature Cushion Grip
Item dimensions L x W x H 19.7 Centimetres
Item weight 2.4 Ounces
Model name 612-4

About this item

  • Precision machined tip provides exact fit for terminal block screws
  • Tip is up to 19-Percent stronger than competitors
  • Tip provides 76-Percent higher torque value than the required ASME B107 Standard
  • Cushion-Grip handle offers greater torque comfort

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Product information

Technical Details

Manufacturer ‎Klein Tools
Place of Business ‎ELKHORN, WI, 53121 US
Part Number ‎612-4
Item model number ‎612-4
Is discontinued by manufacturer ‎No
Size ‎One Size
Colour ‎Black
Style ‎1/8 Terminal Block Screwdriver
Finish ‎Brushed
Material ‎Alloy Steel
Pattern ‎Solid
Shape ‎Rectangular
Power Source ‎hand_powered
Item Package Quantity ‎1
Head Style ‎Flat
Number of Handles ‎1
Measurement System ‎Inch/Metric
Special Features ‎Cushion Grip
Included Components ‎Terminal Block Screwdriver 1/8-Inch Cabinet
Batteries Included? ‎No
Batteries Required? ‎No
Item Weight ‎67.9 g
Country of origin ‎China

Additional Information

ASIN B0058I6VNE
Customer Reviews
4.8 out of 5 stars 2,118 ratings

4.8 out of 5 stars
鶹 Rank
Date First Available April 10 2012

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Klein Tools 612-4 Terminal Block Screwdriver


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From the manufacturer

klein tools
Screwdriver, Made in USA

klein tools
About Klein Tools

As an American manufacturer of hand tools for more than 160 years, Klein Tools makes premium-quality, professional-grade tools that deliver performance, durability and precision. Our team continues to put six generations of expertise into each tool by using the highest quality materials and superior workmanship.

Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day … Since 1857.

Screwdriver, Made in USA, Flat Head Terminal Block Screwdriver, 1/8-Inch Cabinet Tip, 4-Inch Round Shank, TB-DIN

Klein Tools' Terminal Block Screwdriver is precision-machined for an exact fit. This flat head screwdriver provides 76-Percent higher torque values than the required ASME B107 Standard. Its Cushion-Grip handle offers the comfort needed for all-day work.

  • Precision machined tip provides exact fit for terminal block screws
  • 1/8-Inch (3.2 mm) cabinet tip is up to 19-Percent stronger than competitors
  • Tip provides 76-Percent higher torque value than the required ASME B107 Standard
  • Cushion-Grip handle offers greater torque comfort
  • Made in USA

FEATURES

Screwdriver has  4-Inch round shank and 1/8-Inch cabinet tip

Screwdriver has 4-Inch round shank and 1/8-Inch cabinet tip

Terminal Block  Screwdriver's precision-machined tip for exact fit

Terminal Block Screwdriver's precision-machined tip for exact fit

Cushion-Grip handle  for great comfort

Cushion-Grip handle for great comfort

4-in-1 Electronics Screwdriver Set
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Adjustable Screwdriver, #1 and #2 Square
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Demolition Driver with Keystone Tip and 4-Inch Shank
Wire Bending Phillips Round Shank Tip Screwdriver
Customer Reviews
4.6 out of 5 stars 18,270
4.8 out of 5 stars 2,344
4.2 out of 5 stars 285
4.6 out of 5 stars 1,887
4.7 out of 5 stars 2,607
4.7 out of 5 stars 303
Mfg. No. 32581 32596 32708 32751 6024DD 6034B
Description 4-in-1 Electronics Screwdriver Set Multi-Bit Screwdriver /Nut Driver, Magnetic 8-in-1 HVAC Slide Drive Tool Adjustable Screwdriver, #1 and #2 Square Screwdriver with Adjustable Length 4 to 8-Inch Demolition Driver with Keystone Tip and 4-Inch Shank Wire Bending Phillips Round Shank Tip Screwdriver
Phillips Demolition Driver, 4-Inch Shank, Made in USA
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Combo Tip Driver, 4-Inch Fixed Blade, Made in USA
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Customer Reviews
4.5 out of 5 stars 86
4.7 out of 5 stars 456
4.6 out of 5 stars 213
4.8 out of 5 stars 3,034
4.6 out of 5 stars 8,511
4.8 out of 5 stars 153
Mfg. No. 6034DD 7314 7324 85191 MAG2 85445
Description Phillips Demolition Driver, 4-Inch Shank, Made in USA Combo-Tip Driver, 4-Inch Fixed Blade, Made in USA Combo Tip Driver, 4-Inch Fixed Blade, Made in USA Screwdriver / Conduit Reamer, Made in USA Demagnetizer / Magnetizer for Screwdriver Bits Screwdriver Set, Made in USA, Slotted, Phillips

Product description

The Klein 612-4 Terminal Block Screwdriver’s precision machined tip provides an exact fit for terminal block screws. The terminal block screwdriver has a shank length of 4-Inches and width of 1/8-Inch, and an overall length of 7 3/4-Inches. The 612-4 screwdriver has a tip up to 19% stronger than its competitors. The tip provides 76% higher torque value than the required ASME B107 standard. The cushion-grip handle offers greater torque comfort. Since 1857, Klein Tools has manufactured the world's finest hand tools.Today, Klein Tools is the 1 choice among professional tradesmen. We manufacture more than 3,000 tools and accessories, including pliers, cable and bolt cutters, wire strippers, voice-data-video tools and testers, fish tapes, conduit benders, drill bits, insulated tools, gloves and many other high-quality products. Klein Tools' dedication to quality and innovation continues with products available for professional tradesmen worldwide.

Top Brand: KLEIN TOOLS

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Price$26.68$48.22-21%$9.73
Was:$12.24
$19.88$21.10$46.58
Delivery
Get it by Tuesday, Aug 5
Get it by Tuesday, Aug 5
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head size
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Important information

Safety Information

Always wear approved eye protection.NOT insulated. Will NOT protect against electrical shock.Do NOT use to pry or chisel.

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Customer reviews

4.8 out of 5 stars
2,118 global ratings

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Customers say

Customers like the build quality, precision, and grip of the screwdriver. They mention it's durable, professional, and a great addition to any electrician's toolkit. Customers also say it works excellent for their job and performs in the harshest of environments. They also appreciate the handle size, terminal driver, and comfort. However, some customers disagree on the tip strength.

23 customers mention "Build quality"23 positive0 negative

Customers are satisfied with the build quality of the screwdriver. They mention it's durable, professional, and much more substantial than other panel drivers they have.

"Klein make the best screwdrivers on the planet. Great quality and an affordable price point...." Read more

"Excellent product as usual from klien tools." Read more

"Good quality" Read more

"Good product" Read more

18 customers mention "Precision"18 positive0 negative

Customers like the precision of the screwdriver. They mention it's the best tool on the market, perfect for terminal blocks, and a great addition to any electrician's toolkit. Customers also say the precision tip fits screws snugly and the 4-inch shaft reaches tight spots easily.

"...The precision tip fits screws snugly, and the 4-inch shaft reaches tight spots easily...." Read more

"Fantastic terminal screwdriver. Good grip and never leaves screws on terminal blocks loose." Read more

"Good screwdriver for terminal blocks" Read more

"This is a serious screw driver. Great grip and build quality" Read more

10 customers mention "Grip"10 positive0 negative

Customers like the grip of the screwdriver. They mention it has a great grip, even if it gets a little oily. They also say it's easy on the hands.

"Fantastic terminal screwdriver. Good grip and never leaves screws on terminal blocks loose." Read more

"This is a serious screw driver. Great grip and build quality" Read more

"...nice big comfy grip fits well in your hand feels like any other klein screwdriver" Read more

"...The handle is comfortable with a solid grip, and the overall build feels durable and professional. A great addition to any electrician's toolkit." Read more

9 customers mention "Performance"9 positive0 negative

Customers are satisfied with the performance of the screwdriver. They mention it works excellent for their job, has good torque, and performs in the harshest of environments. Some say it works well adjusting the flame on gas stove burners.

"...Great quality and perform in the harshest of environments." Read more

"...Anyway, this tool was not damaged and works as intended. Update: Not really as good as I originally thought...." Read more

"Full size handle with the terminal driver tip Works awesome good torque with the full size handle" Read more

"Worked well adjusting the flame on my gas stove burners." Read more

8 customers mention "Comfort"8 positive0 negative

Customers like the comfort of the screwdriver. They mention it's very comfortable and fits well in their hands.

"...Nice big handle. Comfortable. Lots of reach. And the blade hasn't deformed at all. I would buy this again if I lost it." Read more

"...The handle is comfortable with a solid grip, and the overall build feels durable and professional. A great addition to any electrician's toolkit." Read more

"Easy comfortable choice" Read more

"...handler terminators from Klein and others but this one is way more comfortable and easier to torque down a terminal with just your finger tips...." Read more

8 customers mention "Handle size"8 positive0 negative

Customers like the handle size of the screwdriver. They mention it's the perfect size, fits well in their hands, and is ergonomic. Some also say it's like the classic Klein handle for a terminal driver.

"Full size handle with the terminal driver tip Works awesome good torque with the full size handle" Read more

"...Nice big handle. Comfortable. Lots of reach. And the blade hasn't deformed at all. I would buy this again if I lost it." Read more

"By far my favourite terminal block driver. The big handle is far more ergonomic, especially when you're using it all day...." Read more

"Klein... never disapointed" Read more

3 customers mention "Terminal driver"3 positive0 negative

Customers are satisfied with the terminal driver. They mention it's the best terminal driver ever and their favourite terminal block driver.

"By far my favourite terminal block driver. The big handle is far more ergonomic, especially when you're using it all day...." Read more

"Best terminal driver EVER!" Read more

"Best Terminal Driver Ever..." Read more

5 customers mention "Tip strength"3 positive2 negative

Customers have mixed opinions about the tip strength of the screwdriver. Some mention it's very rigid, offers a perfect grip, and doesn't bend or warp. However, others say the tip is not very strong and has already damaged during normal use.

"...Nice big handle. Comfortable. Lots of reach. And the blade hasn't deformed at all. I would buy this again if I lost it." Read more

"...Update: Not really as good as I originally thought. Already damaged the tip during normal use. For sure not buying anymore Klein tools." Read more

"...this one and thus far it works well, handle is very comfy, tip does not bend or warp, fits in all my terminal blocks without and issue and is just a..." Read more

"Tip not very strong." Read more

Excellent produit
5 out of 5 stars
Excellent produit
Ce tournevis de Klein tools est de qualité professionnel. La pointe plate de 1/8" est très rigide et offre une prise parfaite sur les vis de borniers. La tige de 4" offre une bonne polyvalence et sont manche caoutchouté procure une prise en main impeccable. Bien que le tournevis ne soit pas isolé contre les chocs électriques, il se traduit en excellent investissement. Cet outil à une place de choix dans mon coffre d'électricien. Je le recommande! Livraison ultra rapide avec amazon prime. This screwdriver from Klein tools is professional quality. The flat tip of 1/8 "is very rigid and offers a perfect grip on terminal block screws.The 4" shank offers good versatility and is rubberized handle provides a flawless grip. Although the screwdriver is not insulated against electric shock, it translates into excellent investment. This tool has a place of choice in my electrician's chest. I recommend it! Ultra fast delivery with amazon.prime.
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Top reviews from Canada

  • Reviewed in Canada on July 4, 2025
    Verified Purchase
    Great price
  • Reviewed in Canada on June 25, 2025
    Verified Purchase
    Good quality
  • Reviewed in Canada on May 24, 2025
    Verified Purchase
    The Klein Tools 612-4 is perfect for terminal block work. The precision tip fits screws snugly, and the 4-inch shaft reaches tight spots easily. The handle is comfortable with a solid grip, and the overall build feels durable and professional. A great addition to any electrician's toolkit.
  • Reviewed in Canada on March 30, 2025
    Verified Purchase
    I've used it hundreds of times. I work on mobile equipment and my first move when they start acting up is to tighten all the din rail connections. When our equipment travels on gravel or is just running the vibrations tend to loosen everything. And when I need to tighten a few hundred screws as fast as possible this is the screwdriver I reach for. Nice big handle. Comfortable. Lots of reach. And the blade hasn't deformed at all. I would buy this again if I lost it.
  • Reviewed in Canada on September 16, 2024
    Verified Purchase
    Fantastic terminal screwdriver. Good grip and never leaves screws on terminal blocks loose.
  • Reviewed in Canada on February 23, 2025
    Verified Purchase
    Good screwdriver for terminal blocks
  • Reviewed in Canada on August 24, 2024
    Verified Purchase
    No dislikes - price is high, sure, but Klein tools are simply the best
  • Reviewed in Canada on September 6, 2024
    Verified Purchase
    Good quality, have been pleased with the brand.

Top reviews from other countries

Translate all reviews to English
  • jd
    5.0 out of 5 stars Sturdy Alternative to Undersized Precision Screwdrivers - The Torque We've Been Waiting For.
    Reviewed in the United States on September 5, 2011
    Verified Purchase
    Overall Length: 7 3/4" (200mm)
    Shank Length: 4" (100mm)
    Tip Width: 1/8" (3.2mm)

    MAIN ADVANTAGE: A small tip width, with a larger diameter handle than most 1/8" tip screwdrivers...Klein's miniature series included, this link was previously the best Klein screwdriver with a 1/8" tip, but note the small handle diameter Klein Tool 608-4 1/8-Inch Cabinet Tip Miniature Screwdriver with 4-Inch Round Shank

    MAIN DISADVANTAGE: The temptation to use it on things other than low torque wire terminating, which will likely result in a broken tip. Just because you see that reliable black and yellow sticking out of the dark recesses of your tool bag, don't give in to temptation and begin to use this on any other type of screw other than a terminal block.

    THIS TOOL FITS 99% of the terminal blocks in our facility. I found one type that had a just under 3mm screw hole width (screwdriver tip is 3mm wide), which made me have to pull out the old precision screwdriver. But, they are fairly rare and you can count on this fitting most standard IEC and NEMA blocks. The truth is I could have forced this tool down into the hole and probably tightened the screw, but that leads to other problems with distorting the terminal block and causing the tightening screw to move over and disappear.

    IT SEEMS UNIMAGINABLE that a Klein screwdriver (other than one that uses 10 different bits) would get any other rating other than 5 stars.
    This one is no different. I have searched feverishly for a high quality regular screwdriver that will work on terminal blocks. I have been struggling with different sets of precision screwdrivers for years trying to find one that will produce the proper torque, fit in the screw properly and last (many broken undersized tips in my past).

    LOOSE TERMINAL BLOCK SCREWS in an industrial facility are producing downtime at an ever increasing rate, as things get more automated. I believe they are so common because few technicians (me included) own a screwdriver that will tighten the screw properly. Especially if there are more than one wires under the same terminal block screw.

    Control panels/terminal blocks are the central nervous system of the facility. Now you can give them the attention they deserve and put that "precision" screwdriver to work tightening your sunglasses, not critical controls terminations.
    Customer image
    jd
    5.0 out of 5 stars
    Sturdy Alternative to Undersized Precision Screwdrivers - The Torque We've Been Waiting For.

    Reviewed in the United States on September 5, 2011
    Overall Length: 7 3/4" (200mm)
    Shank Length: 4" (100mm)
    Tip Width: 1/8" (3.2mm)

    MAIN ADVANTAGE: A small tip width, with a larger diameter handle than most 1/8" tip screwdrivers...Klein's miniature series included, this link was previously the best Klein screwdriver with a 1/8" tip, but note the small handle diameter Klein Tool 608-4 1/8-Inch Cabinet Tip Miniature Screwdriver with 4-Inch Round Shank

    MAIN DISADVANTAGE: The temptation to use it on things other than low torque wire terminating, which will likely result in a broken tip. Just because you see that reliable black and yellow sticking out of the dark recesses of your tool bag, don't give in to temptation and begin to use this on any other type of screw other than a terminal block.

    THIS TOOL FITS 99% of the terminal blocks in our facility. I found one type that had a just under 3mm screw hole width (screwdriver tip is 3mm wide), which made me have to pull out the old precision screwdriver. But, they are fairly rare and you can count on this fitting most standard IEC and NEMA blocks. The truth is I could have forced this tool down into the hole and probably tightened the screw, but that leads to other problems with distorting the terminal block and causing the tightening screw to move over and disappear.

    IT SEEMS UNIMAGINABLE that a Klein screwdriver (other than one that uses 10 different bits) would get any other rating other than 5 stars.
    This one is no different. I have searched feverishly for a high quality regular screwdriver that will work on terminal blocks. I have been struggling with different sets of precision screwdrivers for years trying to find one that will produce the proper torque, fit in the screw properly and last (many broken undersized tips in my past).

    LOOSE TERMINAL BLOCK SCREWS in an industrial facility are producing downtime at an ever increasing rate, as things get more automated. I believe they are so common because few technicians (me included) own a screwdriver that will tighten the screw properly. Especially if there are more than one wires under the same terminal block screw.

    Control panels/terminal blocks are the central nervous system of the facility. Now you can give them the attention they deserve and put that "precision" screwdriver to work tightening your sunglasses, not critical controls terminations.
    Images in this review
    Customer imageCustomer imageCustomer image
  • Tracy D. Albert
    5.0 out of 5 stars Nice Terminal Screwdriver.
    Reviewed in the United States on June 5, 2025
    Verified Purchase
    Fits well.
  • Jared Betts
    5.0 out of 5 stars Technicans best friend
    Reviewed in the United States on February 7, 2024
    Verified Purchase
    Have you ever wished you had a small flat head screw driver with a long skinny shank? Then look no further. This little fella fits the bill with ease. As a electrical technician I have to fiddle with tiny and I mean tiny terminal blocks that take 22-14 guage wire all the time. This has been permanently added to my carry bag as it just makes life so much easier. The flat head measuring 1/8th inch will put in miles of work.

    Need to remove a wire from a small terminal block? Or what about a contactor with a tiny release for the din rail? How about a push-in wire connector giving you fits and not opening?

    Well this is the tool for the job. Its so handy and works so amazingly well you will wish you had it sooner.
    Customer image
    Jared Betts
    5.0 out of 5 stars
    Technicans best friend

    Reviewed in the United States on February 7, 2024
    Have you ever wished you had a small flat head screw driver with a long skinny shank? Then look no further. This little fella fits the bill with ease. As a electrical technician I have to fiddle with tiny and I mean tiny terminal blocks that take 22-14 guage wire all the time. This has been permanently added to my carry bag as it just makes life so much easier. The flat head measuring 1/8th inch will put in miles of work.

    Need to remove a wire from a small terminal block? Or what about a contactor with a tiny release for the din rail? How about a push-in wire connector giving you fits and not opening?

    Well this is the tool for the job. Its so handy and works so amazingly well you will wish you had it sooner.
    Images in this review
    Customer image
  • BrewingRAGE26
    5.0 out of 5 stars Klein makes great tools
    Reviewed in the United States on November 27, 2022
    Verified Purchase
    Outstanding made in America tool and a welcome addition to my current Klein collection. Very well balanced and the grip for the screwdriver is amazing. It’s comfortable and easy to use which is consistent with this brand. I appreciate the lifetime warranty Klein offers (unlike Craftman’s “lifetime” warranty which won’t allow for any speck of rust, and I mean speck!) Thank you Klein tools for holding such high standards of quality and construction, and for your continued excellence in the industry.
  • Alberto 2G
    5.0 out of 5 stars Klein tools
    Reviewed in Mexico on October 10, 2023
    Verified Purchase
    Excelente desarmador, justo lo que necesitaba.
    Customer image
    Alberto 2G
    5.0 out of 5 stars
    Klein tools

    Reviewed in Mexico on October 10, 2023
    Excelente desarmador, justo lo que necesitaba.
    Images in this review
    Customer imageCustomer imageCustomer image
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