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Johns Manville Purlin Fasteners, Steel-Coated Membrane Screws, #12 Gauge with 1/4 in. Hex Head, 3.75 in. to 7 in., 500-Count Box
Regular price $254.00Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville Purlin Fasteners, Steel-Coated Membrane Screws, #12 Gauge with 1/4 in. Hex Head, 3.75 in. to 7 in., 500-Count Box
Johns Manville Purlin Fasteners are steel-coated roof membrane fasteners with a 1/4 in. hex head and 3/4 in. drill point, engineered for attaching membranes to structural steel purlins. Choose from four lengths: 3.75 in., 4.75 in., 5.75 in. and 7 in. Each box contains 500 fasteners in mill finish and pairs with JM membrane systems over steel-deck roofing.
Key Features:
- Steel-Coated Build: Fasteners are made of coated steel for secure membrane attachment.
- Self-Drilling Point: The 3/4 in. drill point bores into structural steel purlins without pre-drilling.
- Hex Head Drive: A 1/4 in. hex head accepts standard hex-driver bits for fast installation.
- Round Plate: Includes a 2 3/8 in. (6.03 cm) round plate for holding power at the membrane.
- Purlin Range: Designed for structural steel purlins from 12 to 18 gauge (2.77 mm to 1.25 mm).
- Four Lengths: Available in 3.75 in., 4.75 in., 5.75 in. and 7 in. lengths.
- Bulk Box: Sold 500 fasteners per box for commercial roofing jobs.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 box, 500 fasteners |
| Product line | JM Purlin Fasteners |
| Available sizes | 3.75 in., 4.75 in., 5.75 in., 7 in., each 500/box |
| Material | Coated steel |
| Color / finish | Mill |
| Wire gauge | #12 |
| Head | 1/4 in. hex head |
| Drill point | 3/4 in. |
| Plate | 2 3/8 in. (6.03 cm) round |
| Pack quantity | 500 per box |
| Deck type | Structural steel purlins 12-18 gauge (2.77 mm-1.25 mm) metal |
| Intended use | Roof membrane attachment to structural steel purlins |
Coverage & How Much You Need:
One box covers roughly 500 membrane attachment points; fastener layout and spacing follow the membrane manufacturer's specified fastening pattern for the roof zone.
Fit and Compatibility:
Designed for use with roof membranes installed over structural steel purlins from 12 to 18 gauge (2.77 mm to 1.25 mm). Select length so the drill point and threads fully engage the purlin; drive tools and washers/plates per the roofing system specification are sold separately.
Frequently Asked Questions (FAQ):
Q: How many fasteners come in a box?
A: Each box contains 500 fasteners, available in 3.75 in., 4.75 in., 5.75 in. and 7 in. lengths.
Q: What decks are these fasteners designed for?
A: They are designed for structural steel purlins ranging from 12 to 18 gauge (2.77 mm to 1.25 mm) metal.
Q: Do I need to pre-drill?
A: No, the 3/4 in. drill point is designed to penetrate the steel purlin directly.
Q: What driver fits these screws?
A: The 1/4 in. hex head drives with a standard 1/4 in. hex bit.
Q: Which length should I choose?
A: Choose a length that secures the membrane plus insulation and fully engages the purlin; the four listed sizes cover common build-ups.
Q: What finish are the fasteners?
A: The listed variants are mill finish coated-steel fasteners.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Match fastener length to the total assembly thickness so the screw penetrates well into the purlin without protruding through thin-gauge steel. These are intended specifically for structural steel purlin decks, not wood or lightweight concrete. Keep a hex driver with proper clutch settings on the screw gun to avoid stripping the 1/4 in. hex head or overdriving the plate.
Wear eye protection and gloves when driving self-drilling screws; freshly cut fastener tips and shavings are sharp.
Order Johns Manville Purlin Fasteners in your required length and get 500 steel-coated membrane screws per box.
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