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Carlisle HP Purlin Fasteners, Self-Drilling Hex Head Steel Screws, 6-1/4 in. and 7-1/4 in., 500 per Box
Regular price $470.00Carlisle HP Purlin Fasteners, Self-Drilling Hex Head Steel Screws, 6-1/4 in. and 7-1/4 in., 500 per Box
Carlisle HP Purlin Fasteners secure membrane and Pressure-Sensitive (PS) RUSS to structural steel purlins in Carlisle metal retrofit roofing systems. Two sizes are offered, 6-1/4 in. and 7-1/4 in. #14, in mill finish, 500 screws per box. The self-drilling point penetrates 12- to 18-gauge steel and pairs with 2 in. HP Polymer Seam Plates and 2-3/8 in. Piranha Plates.
Key Features:
- Self-drilling point: The self-drilling point can penetrate 12-gauge to 18-gauge structural steel purlins without pre-drilling.
- Hex head drive: The hex head drive provides positive bit engagement during the drilling process.
- Holding power: Superior pull-out and back-out resistance keeps membrane and PS RUSS securely fastened.
- Corrosion resistance: Excellent corrosion resistance surpasses the FM 4470 corrosion test.
- Retrofit system fit: Specifically designed to secure membrane and Pressure-Sensitive (PS) RUSS to structural steel purlins in Carlisle metal retrofit roofing systems.
- Plate compatibility: Compatible with 2" (50.8 mm) HP Polymer Seam Plates and 2-3/8" (60.3 mm) Piranha Plates.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Carlisle |
| Sell unit | 1 box of 500 fasteners |
| Product line | Carlisle HP Purlin Fasteners |
| Available sizes | 6-1/4" (500/box) and 7-1/4" #14 (500/box) |
| Material | Steel, corrosion-resistant coating |
| Color / finish | Mill |
| Length | 6-1/4 in. or 7-1/4 in.; fasteners are made with a 3/4 in. (19 mm) extended point, so actual length of a 3" HP Purlin Fastener is 3-3/4 in. |
| Point type | Self-drilling point for 12-gauge to 18-gauge steel |
| Drive | Hex head |
| Minimum penetration | 1-1/4" (31.75 mm), including the 3/4 in. point extension |
| Plate compatibility | 2" HP Polymer Seam Plates; 2-3/8" (60.3 mm) Piranha Plates |
| Corrosion testing | Surpasses the FM 4470 corrosion test |
| Intended use | Securing membrane and PS RUSS to structural steel purlins in metal retrofit roofing systems |
| Pack quantity | 500 fasteners per box |
Fit and Compatibility:
HP Purlin Fasteners are designed for Carlisle metal retrofit roofing systems and are compatible with 2" HP Polymer Seam Plates and 2-3/8" Piranha Plates. Minimum penetration into the purlin is 1-1/4" including the 3/4" extended point; plates are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included in a box?
A: Each box contains 500 HP Purlin Fasteners in either the 6-1/4 in. or 7-1/4 in. #14 size, in mill finish.
Q: What steel thickness can these screws penetrate?
A: The self-drilling point can penetrate 12-gauge to 18-gauge steel.
Q: How deep must the screw penetrate the purlin?
A: Minimum penetration is 1-1/4" (31.75 mm), which includes the 3/4" extended point built into the fastener.
Q: Which seam plates do they work with?
A: They are compatible with 2" (50.8 mm) HP Polymer Seam Plates and 2-3/8" (60.3 mm) Piranha Plates.
Q: How corrosion resistant are they?
A: They offer excellent corrosion resistance and surpass the FM 4470 corrosion test.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
In a metal retrofit, the fastener is the weak link if you undersize it — pick the length that reaches 1-1/4 in. minimum penetration into the purlin after accounting for the 3/4 in. extended point and any plate thickness. Use a hex driver with positive bit engagement to keep the screw from wobbling as it drills 12- to 18-gauge steel. Pair each screw with the matching HP Polymer Seam Plate or Piranha Plate for proper load distribution. Choose the 7-1/4 in. #14 when your retrofit detail stacks additional material above the purlin.
Wear eye protection and gloves when driving self-drilling screws; fasteners and cut points are sharp, and driving over steel requires secure footing and fall protection.
Order Carlisle HP Purlin Fasteners in 500-count boxes for your next metal retrofit roof.
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