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Internet # 100137289

Model # HDZD

Store SKU # 364231

#7 x 1/2 in. External Hex Flange Hex-Head Sheet Metal Screw (50-Bag)

Limit 5 per order
  • Highly versatile design allows for indoor and outdoor use
  • Unique self-piercing design enables rapid driving
  • Screw is heat treated to taper to a fine and sharp point
  • View More Details
0 in stock
Free & Easy Returns In Store or Online
Return this item within 90 days of purchase. Read Return Policy

Product Details

About This Product

HDZD is the number 1 sheet metal screw for professionals. A unique thread design and quality-controlled manufacture spell the Zip-In difference.Zip-In's sophisticated heat treat process allows the screw to taper to a fine, sharp point without sacrificing critical point strength. A single starting thread is formed down to the very tip of the point and is the source of Zip-In's penetrating power. A second thread above the point engages after initial penetration and drills in the screw double fast. Zip-In screws are faster driving, with a greater capacity for fastening heavier gauges of sheet metal than any other self-piercing type.


  • Indoor or outdoor use
  • Use with sheet metal
  • Steel construction
  • 1/2 in. L
  • Self-piercing design
  • Zip-in design
  • Undercut head design
  • Includes 50 screws
  • Highly versatile
  • Common project applications: roofing, HVAC, steel stud framing, gutters, and register vents
  • Return Policy

Product Information

Internet # 100137289

Model # HDZD

Store SKU # 364231

Additional Resources

Shop All Malco



Screw Length

1/2 in



Thread Pitch (mm)

6.35 mm

Threads Per Inch (TPI)



Drive Style


Fastener Color


Fastener Material

Carbon Steel

Fastener Type

Self Piercing Screws


ACQ Rated

Head Style

Hex Head


No Additional Items Included



Materials Fastened


Measurement System


Package Quantity


Product Weight (lb.)

0.16 lb



Thread Style

Coarse Thread

Warranty / Certifications

Manufacturer Warranty


Questions & Answers

Q:Will these screws work good with the Malco Magnetic 1/4 in. and 5/16 in. Reversible Hex Chuck Driver?
by|Sep 30, 2022
1 Answer
Answer This Question

A:  Great question. The Malco Zip-in and Bit-tip screws are designed to work as a system with the Cleanable reversible hex drivers; making them a great pairing.

by|Oct 3, 2022
    Q:Are these screws galvanized/all weather?
    by|Aug 12, 2022
    2 Answers
    Answer This Question

    A:  If these screws are meant for indoor duct work, perhaps you should remove "gutters" from the list of common project applications in the description: "Common project applications: roofing, HVAC, steel stud framing, gutters, and register vents"

    by|Apr 7, 2023
      2 found this answer helpful

      A:  Malco #7 x 1/2 in. External Hex Flange Hex-Head Sheet Metal Screw (50-Bag) are zinc plated and are a sheet metal screw meant for indoor use on duct work. Please feel free to call Malco Products Customer Service at 800-328-3530 with any questions you may have about this product.

      by|Jan 6, 2023
        1 found this answer helpful
        Q:what size socket fits on the head of the screw?
        by|Jun 23, 2020
        1 Answer
        Answer This Question

        A:  ¼” MSH Is the size of socket you would want to use.

        by|Apr 9, 2023
          2 found this answer helpful
          Showing 1-3 of 3

          Customer Reviews

          4.8 out of 5

          • 4.8 out of 46 reviews
          • 86% recommend this product
          Filter by:
          Showing 1-10 of 46 reviews
          • Verified Purchase
          Used these to install gutter guards on some gutters for a customer. Went great, no problems
          • Verified Purchase
          Pay attention to quantity when comparing prices
          Great screws for my ductwork project. Just don’t buy them at Home Depot. $6.88 for 100 screws from that other store is better than Home Depot’s $6.88 for 50 screws. Same Malco screws, twice as expensive at Home Depot. Skip team orange on this purchase and go with team blue.
          Response from Malco ProductsMar 13, 2024
          Thank you for sharing your experience with our screws for your ductwork project. We understand your concern about pricing differences between retailers. It's important to note that the prices may vary based on the pack sizes offered by each retailer. We appreciate your feedback and encourage you to reach out to our customer service team by email: custsvcs@malcotools.com or call us at 800-328-3530 if you have any further questions or concerns. We're here to assist you. Thank you for choosing Malco Tools! Malco
            1 found this review helpful
            prompt availability for pickup.
            • Verified Purchase
            • Verified Purchase
            • Verified Purchase
            Theyre sheet metal screws, they joint 2 pieces of sheet metal together, what mpre is there to say
            • Verified Purchase
            I’m a noob. My project was inspired by my cats peeing into the vents. The project ended up like an Erector Set kit; the sheet metal screw locked it up and connected the sections of tubing I ran from vent to furnace.
            • Verified Purchase
            • Verified Purchase
            • Verified Purchase
            Showing 1-10 of 46 reviews