Skip to content
Carlisle SynTec HP Purlin Fastener 4-3/4 in. Self-Drilling Roofing Screw, 500-Carton
Regular price $328.49Orders start at $399 — combine any items to reach the minimum. Learn more
Carlisle SynTec HP Purlin Fastener 4-3/4 in. Self-Drilling Roofing Screw, 500-Carton
Carlisle SynTec HP Purlin Fasteners secure single-ply membrane and Pressure-Sensitive (PS) RUSS to structural steel purlins in Carlisle metal retrofit roofing systems. This 4.75 in. size ships 500 fasteners per carton, weighing about 13 lb. They pair with 2 in. HP Polymer Seam Plates and 2-3/8 in. Piranha Plates.
Key Features:
- Self-drilling point: The self-drilling point penetrates 12-gauge to 18-gauge steel purlins without pre-drilling.
- Hex head drive: Hex head drive gives positive bit engagement during the drilling process.
- High pull-out strength: Delivers minimum pull-out of 1,000 lb per fastener in 12- and 14-gauge purlins, 800 lb in 16-gauge and 600 lb in 18-gauge.
- Corrosion resistant: Corrosion resistance surpasses the FM 4470 corrosion test.
- Extended point: Manufactured with a 3/4 in. extended point; the 4.75 in. overall length includes this extension.
- FM Approved: Listed as FM Approved for use in metal retrofit roofing assemblies.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Carlisle SynTec |
| Sell unit | 1 carton of 500 fasteners |
| Product line | HP Purlin Fastener |
| Dimensions | 4-3/4 in. (121 mm) overall length |
| Thread length | 3 in. (75 mm) |
| Point | Self-drilling with 3/4 in. (19 mm) extended point |
| Head | Hex head |
| Purlin gauge range | 12-ga to 18-ga steel |
| Minimum penetration | 1-1/4 in. (31.75 mm), includes the 3/4 in. extension |
| Pull-out resistance | 1,000 lb (12-14 ga), 800 lb (16 ga), 600 lb (18 ga) per fastener |
| Pack quantity | 500 fasteners per carton |
| Weight | 13 lb per carton |
| Approvals | FM Approved; surpasses FM 4470 corrosion test |
| Intended use | Securing membrane and PS RUSS to structural steel purlins in metal retrofit roofing systems |
| Compatible plates | 2 in. HP Polymer Seam Plates, 2-3/8 in. Piranha Plates |
Coverage & How Much You Need:
Fastener count depends on the specified fastening pattern for your membrane and plate layout; size the job from the Carlisle specification sheets for the assembly, not a fixed per-carton area.
Fit and Compatibility:
Designed for Carlisle metal retrofit roofing systems and compatible with 2 in. HP Polymer Seam Plates and 2-3/8 in. Piranha Plates (sold separately). Use the length that provides at least 1-1/4 in. penetration into the purlin including the 3/4 in. point extension.
Frequently Asked Questions (FAQ):
Q: How many fasteners come in a carton?
A: 500 fasteners per carton, with the carton weighing about 13 lb.
Q: What does the 4.75 in. length include?
A: The 4.75 in. (121 mm) is the overall length, including a 3/4 in. extended drill point; minimum penetration of 1-1/4 in. counts the extension.
Q: Do I need to pre-drill the purlins?
A: No for 12- to 18-gauge steel purlins, which the self-drilling point penetrates; pre-drilling may be required for purlins heavier than 12-gauge.
Q: What driver should I use?
A: A standard clutch drive electric screw gun at moderate speed, maximum 1,800 rpm, driving the fastener flush with the top of the plate.
Q: Which plates do these fit?
A: 2 in. HP Polymer Seam Plates and 2-3/8 in. Piranha Plates; plates are sold separately.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Pick fastener length from the purlin gauge and insulation/assembly build-up: the rule is at least 1-1/4 in. penetration past the purlin face including the 3/4 in. point extension. Drive flush with the plate top at moderate screw-gun speed (max 1,800 rpm) so you do not burn out the drill point, and avoid over-driving, which can strip the purlin. For heavier-than-12-gauge purlins, plan on pre-drilling per the Carlisle details.
Wear eye protection during drilling and installation, and follow Carlisle specifications and details for the assembly.
Order the Carlisle SynTec 4.75 in. HP Purlin Fastener 500-carton for your metal retrofit roof today.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.
