Carlisle SynTec HP-X 15 in. Roofing Fastener, Black, Carton of 250 - image 1

Carlisle SynTec HP-X 15 in. Roofing Fastener, Black, Carton of 250

Regular price $677.50

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Carlisle SynTec HP-X 15 in. Roofing Fastener, Black, Carton of 250


This is Carlisle SynTec's HP-X high-performance roofing fastener in a 15 in. length, sold as a carton of 250 black screws. It secures Carlisle single-ply membrane and insulation to steel or wood roof decks through approved Carlisle plates. Pair it with Carlisle HP-X plates and a clutch-drive electric screw gun.


Key Features:

  • Superior pull-out: Oversized heavy shank and #15 thread diameter provide enhanced pull-out resistance.
  • Drill point design: The miniature drill point penetrates decks quickly and contributes to exceptional back-out and pull-out resistance.
  • Buttress threads: Deep buttress threads further increase pull-out and back-out resistance.
  • Corrosion resistant: CR-10 coating delivers excellent corrosion resistance, surpassing the FM4470 corrosion test.
  • No pre-drilling: Installs without pre-drilling on steel decks (20- or 22-gauge) or wood decks of minimum 15/32 in. CDX plywood.
  • Extra-long reach: The 15 in. length penetrates very thick insulation assemblies to reach the roof deck.

Specifications Table:

Specification Details
Brand Carlisle SynTec
Manufacturer model 300626
Sell unit 1 carton of 250 fasteners
Product line HP-X Fastener
Length 15 in. (355 mm)
Head #3 Phillips truss head, .435 in. (11.04 mm) diameter
Thread diameter .265 in. (6.73 mm)
Shank diameter .202 in. (5.13 mm)
Thread length 4 in. (102 mm)
Color Black
Coating CR-10
Pack quantity 250 fasteners per carton
Weight 29 lb per carton (dealer sheet); manufacturer PDS lists 32 lb per carton for the 15 in. size
Approvals FM Approved; corrosion resistance surpasses FM4470
Deck compatibility Steel decks 20-gauge (0.91 mm) or 22-gauge (0.76 mm), or wood (minimum 15/32 in. CDX plywood)
Intended use Securing Carlisle single-ply membrane and insulation

Coverage & How Much You Need:

One carton contains 250 fifteen-inch fasteners. Fastener count per roof area depends on insulation thickness, deck type, and the wind uplift design pressure; follow the fastening pattern in your Carlisle specification.

Fit and Compatibility:

Designed for Carlisle single-ply membrane and insulation assemblies and installs through approved Carlisle plates (sold separately). Use on 20- or 22-gauge steel decks or minimum 15/32 in. CDX plywood wood decks. Use a clutch-drive electric screw gun (0-2,500 rpm); a #3 Phillips bit is required for the truss head.


Frequently Asked Questions (FAQ):

Q: How many fasteners are in a carton?
A: This carton contains 250 fifteen-inch HP-X fasteners.


Q: Do I need to pre-drill the deck?
A: No. The miniature drill point penetrates steel and wood decks without pre-drilling; drive with a standard clutch-drive electric screw gun (0-2,500 rpm).


Q: What decks does this fastener work in?
A: It is designed for 20- or 22-gauge steel decks and wood decks of at least 15/32 in. CDX plywood.


Q: Will it resist corrosion?
A: The CR-10 coating surpasses the FM4470 corrosion test, and the item is listed as FM Approved.


Q: Are plates included?
A: No, fasteners install through approved Carlisle plates, which are sold separately.


Q: What fastener length should I choose?
A: Select a length that penetrates the deck adequately for your insulation thickness; the 15 in. fastener suits the deepest multi-layer insulation assemblies.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

Choose fastener length from the total insulation thickness plus required deck penetration, and verify pull-out on the actual deck with a fastener pull test, since deck strength varies with moisture and condition. Extra-long fasteners like the 15 in. demand careful perpendicular driving with a well-adjusted clutch to keep the assembly straight and avoid overdriving at the plate. Pair with approved Carlisle HP-X plates to complete a Carlisle-system attachment that supports wind uplift ratings.

Wear eye protection during drilling and installation, and take care not to overdrive the fastener.


Order the Carlisle SynTec HP-X 15 in. fastener carton of 250 to secure your single-ply roofing assembly.

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Subject to Approval & Availability
All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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