NGP FDTB-3/8 90 Minute Fire-Ra...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$178.00
$139.86
NGP FDTB-3/8 90 Minute Thru-Bolts, Fits 1-3/4" to 2" Thick Doors, 1/4-20 Thread Size, 3/8" Height, Box of 20 Pieces

NGP FDTB-3/8 90 Minute Fire-Rated Thru-Bolts 1/4-20 Thread 3/8" Height for 1-3/4" to 2" Doors

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Model: FDTB-3/8

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

$178.00
$139.86
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NGP 90 Minute Fire-Rated Thru-Bolts 1/4-20 Thread 3/8" Height for 1-3/4" to 2" Doors

NFPA 80 Compliant Fire Door Hardware Solution

NGP 90 Minute Fire-Rated Thru-Bolts provide essential fire door compliance for commercial applications requiring secure fastening solutions. These zinc-plated steel thru-bolt sleeves with steel machine screws are specifically designed to fit 1-3/4" to 2" thick doors with 1/4-20 thread size and 3/8" height specifications. Meeting NFPA 80 requirements for filling open holes in fire doors with steel fasteners, these professional-grade components ensure code compliance while maintaining fire door integrity.

Professional Features & Benefits

  • Door Thickness Compatibility: Designed for 1-3/4" to 2" thick doors for versatile commercial door applications.
  • Thread Specifications: 1/4-20 thread size with 3/8" height provides secure fastening with standard hardware configurations.
  • Fire Door Compliance: Meets NFPA 80 requirements for filling open holes in fire doors with steel fasteners for code compliance.
  • Durable Construction: Zinc-plated steel thru-bolt sleeve with steel machine screw provides corrosion resistance and long-term reliability.
  • Convenient Packaging: Available in boxes of twenty pieces for efficient project planning and inventory management.
  • Professional Application: Specifically engineered for commercial fire door installations where code compliance is mandatory.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Product Category: Door Trim and Accessories
  • Product Group: Door Trim and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Substrate: Steel
  • Product Type: Thru-Bolts
  • Subcategory: Parts and Accessories

Professional Applications

  • Commercial Fire Door Installations
  • Educational Facility Safety Compliance
  • Healthcare Institution Fire Protection
  • Industrial Facility Code Compliance
  • Multi-Tenant Residential Fire Safety
  • Government and Municipal Building Safety
  • Retail Establishment Fire Door Maintenance

Why Choose NGP Quality?

NGP fire-rated thru-bolts deliver professional-grade reliability with zinc-plated steel construction and NFPA 80 compliance certification. These components are engineered for demanding commercial applications where fire door integrity and code compliance are essential. The steel construction and protective plating ensure long-term performance in critical fire safety applications.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Thru-Bolts
Subcategory:
Parts and Accessories
Commercial/Residential:
Commercial
Product Substrate:
Steel
Product Category:
Door Trim and Accessories
Department:
Door Hardware

NGP FDTB-3/8 – Frequently Asked Questions

1) Will NGP FDTB-3/8 thru-bolts work on a 1-3/4 inch fire-rated door?
Yes. The FDTB-3/8 thru-bolt set covers doors from 1-3/4 inches up to 2 inches thick, which is the standard commercial range. The sleeve threads are 1/4-20, matching the thru-bolt holes on most commercial lock and exit device trim.
2) Do I have to use steel thru-bolts on a fire door, or can I use regular screws?
On a fire door, the fastener has to be steel. NFPA 80 requires open holes in a fire door to be filled with steel fasteners, and the FDTB-3/8 is built for exactly that: a zinc-plated steel sleeve with a steel machine screw. Wood screws or plated-pot-metal fasteners do not satisfy that requirement.
3) My door is 2-1/4 inches thick. Can I use the FDTB-3/8?
No. The FDTB-3/8 is sized for 1-3/4 to 2 inch doors only. On a thicker leaf the sleeve and screw won't span the opening correctly, and a fire door fastener that doesn't seat properly is not a compliant repair. You'd need a thru-bolt set specified for that thickness.
4) What does the 3/8 inch in NGP FDTB-3/8 refer to?
It's the height of the thru-bolt sleeve, 3/8 inch. That dimension matters because the sleeve has to suit the trim and door prep it sits in. The thread on the machine screw is 1/4-20, and the assembly is sized for doors 1-3/4 to 2 inches thick.
5) What is a fire-rated thru-bolt actually used for on a door?
A thru-bolt passes all the way through the door leaf to fasten hardware, typically lock trim or an exit device, from both faces instead of relying on screws into the door edge or core. On a fire door it does double duty: it secures the hardware and fills the through-hole with steel, which is what NFPA 80 calls for. The FDTB-3/8 pairs a zinc-plated steel sleeve with a steel machine screw to do both.
6) How many thru-bolts come in a box of NGP FDTB-3/8?
Twenty pieces per box. For a property manager or MRO buyer doing a run of fire doors, that's enough to cover multiple openings from one order rather than buying per-door.
7) Will zinc-plated thru-bolts hold up in a damp stairwell or exterior fire door?
The sleeve is zinc-plated steel, which gives it corrosion resistance for interior and protected commercial openings. The base material throughout is steel, both sleeve and machine screw, so there's no dissimilar-metal mix in the fastener itself.
How fast can I get the NGP FDTB-3/8 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 NGP FDTB-3/8 come with a warranty?
Absolutely. The NGP FDTB-3/8 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 NGP FDTB-3/8?
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 NGP FDTB-3/8 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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