Metallics TXW1278 12-24 x 7/8 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$192.86
Metallics TXW1278 12-24 x 7/8 in. 5/16 Hex Head Self-Drilling Screws with Bonded Sealing Washer - #4 Drill Point - All-Weather - 100qty

Metallics TXW1278 12-24 x 7/8 in. 5/16 Hex Head Self-Drilling Screws with Bonded Sealing Washer - #4 Drill Point - All-Weather - Each

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Model: TXW1278
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$192.86
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12-24 x 7/8 in. 5/16 Hex Head Self-Drilling Screws with Bonded Sealing Washer - #4 Drill Point - All-Weather - 100qty

  • Features

    • 5/16 Hex Head with Hex Drive
    • #4 Drill Point
    • 12-24 Diameter, 7/8" Length
    • All-Weather Coating
    • Includes Bonded Sealing Washer for a weather-tight seal

  • Additional Notes

    • Economical fasteners for applications requiring a weather-tight seal|other sizes and quantities available by request

Manufacturer Resources

Product Specs

Minimum Purchase:
100 units
Arra Compliant:
C
Buy American Compliant:
C
Country Of Origin:
United States
Dimensional Standard:
ASME B18.6.3-2010
Division:
Electrical H1
Drill Point Size:
#4
Drive Type:
Hex
Fastener Head Height:
0.139 - 0.155 in.
Fastener Head Type:
Hex
Fastener Head Width:
0.305 - 0.312 in.
Fastener Length:
8-Jul
Hardness:
Rockwell C32-40
Language Code:
EN
Material Standard:
AISI 1016 - 1024
Order Minimum Imperial:
100
Order Minimum Uom Imperial:
CT
Pack Type:
Jar
Panel Thickness:
0.110 - 0.210 IN
Product Group:
Fasteners
Product Height:
3.6 in
Product Length:
3 in
Product Weight:
1.27 lbs
Product Width:
3 in
Screw Point Type:
Drill Point
Slot Depth:
0.077 - 0.093
Slot Width:
0.056 - 0.067
Sub Division:
Electrical-E H2
Thread Per Inch:
24
Thread Standard:
SAE J78 - 2013
Torsional Strength:
92 lb-in minimum
Washer Od:
0.398 - 0.432 in.
Washer Thickness:
0.022 - 0.039 IN
Width Across Corners:
0.34
Department:
Electrical
Product Subgroup:
Screws
Product Type:
Type BSD Self-Drilling Screw
Type2:
Type BSD Self-Drilling Screw
Series:
TXW
Product Finish:
Zinc/All-Weather Coating
Product Details:
Type BSD Self-Drilling Screw
Product Material:
All-Weather

Metallics TXW1278 – Frequently Asked Questions

1) Does the TXW1278 screw actually seal against water, or do I need a separate washer?
A bonded sealing washer is already on the screw, so nothing extra is needed for a weather-tight seal. The washer measures 0.398 to 0.432 in. outside diameter and 0.022 to 0.039 in. thick, which is what compresses against the panel when the hex head seats.
2) Do these screws meet Buy American requirements for a federal or public project?
They are flagged Buy American compliant and ARRA compliant, with United States country of origin, which is what a government or institutional procurement file needs on a fastener line item.
3) What size driver or socket do I need for these 12-24 hex head screws?
A 5/16 hex driver. Head width across the flats runs 0.305 to 0.312 in. with 0.34 across the corners, so a standard 5/16 magnetic nutsetter in a screw gun seats it. Head height is 0.139 to 0.155 in.
4) Are these screws suitable for outdoor and rooftop use?
Yes. The TXW1278 has a zinc all-weather coating and a bonded sealing washer, which is the combination used for exterior panel, flashing and rooftop equipment work where the penetration has to shed water.
5) Will these screws snap when driven into heavier gauge steel?
Torsional strength is 92 lb-in minimum with a case hardness of Rockwell C32-40, made from AISI 1016-1024 carbon steel. Drive them at moderate RPM with steady pressure and stop as soon as the washer compresses; over-torquing past seating is what shears a self-drilling screw, not the drilling itself.
6) What standards are these 12-24 self-drilling screws built to?
Dimensions follow ASME B18.6.3-2010 and the thread follows SAE J78-2013, the self-drilling tapping screw standard. Thread pitch is 24 threads per inch, and the point is a true drill point rather than a piercing or thread-cutting tip, so no pilot hole is needed.
7) Is a 7/8 in. length long enough for my assembly?
At 7/8 in. overall, the screw has to drill through the full stack and still leave thread engaged. Against the 0.110 to 0.210 in. panel capacity of the #4 point, that leaves plenty of shank for sheet-to-sheet or sheet-to-structure work, but it is not enough for thick layered build-ups or standoff-mounted equipment. Metallics offers other lengths in the TXW series for deeper stacks.
8) How many Metallics TXW1278 screws come in a package?
They ship in a jar of 100, which is the order minimum. Jar weight is 1.27 lbs.
How fast can I get the Metallics TXW1278 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Metallics TXW1278 come with a warranty?
Absolutely. The Metallics TXW1278 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Metallics TXW1278?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Metallics TXW1278 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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