ZAGO’s Oversized Phillips Pan Head Seal Screws are easy to install and designed to perform. Engineered for applications that demand broad surface coverage, enhanced stability and environmental sealing, these oversized fasteners are complete with an elastomeric O-ring that fits into a specially designed groove on the underside of the head. Once installed, the O-ring compresses into the groove, forming a 360-degree hermetic seal, eliminating failure due to fluid ingress and egress.
This unified design eliminates the need for secondary washers, gaskets, and sealants, reducing assembly time, lowering total part count, and improving long-term reliability.
Designed for mission-critical applications, these pressure-sealing fasteners deliver both mechanical fastening and environmental sealing, performing under pressure and exposure to fluids and particulates. They are ideal for aerospace, medical devices, robotics, and defense, among other uses.
Oversized head fasteners increase the load-bearing surface, distributing clamp force over a wider area. This reduces localized stress on thin or soft materials and helps prevent deformation, cracking or pull-through. It also improves stability across uneven or rough surfaces, where standard heads may concentrate load in smaller contact zones.
Increased surface area also supports more consistent compression of sealing elements, such as ZAGO’s O-rings. By allowing for more uniform compression of the sealing element without excessive torque, oversized head designs help reduce the risk of thread stripping, over tightening, and material damage.
All components are fully customizable (see detail below) and engineered-to-order to ensure optimal performance. ZAGO’s team of US-based engineers is available to share their expertise and help make the best choice for your application.
Feature | Detail |
|---|---|
Drive Style | Phillips Cross Recessed (conventional tooling) |
Head Type | Oversized Pan Head (wide bearing surface) |
Seal Type | O-ring under head, 360° sealing |
Installation | Compatible with standard torque requirements for each material grade |
Reusability | Yes (seal maintains integrity over multiple assemblies) |
Material Options | 18-8 Stainless Steel, Carbon Steel, 316 Stainless Steel, Titanium, Brass, Aluminum; custom materials available on request (see detail) |
O-Ring Options | Silicone, Buna, Fluorosilicone, Viton® (FKM), EPDM, Neoprene, FDA APP (see detail) |
Temperature Range | Varies by O-Ring material (see detail) |
Compliance | REACH / RoHS / DFARS (upon request) |
Parameter | Options |
|---|---|
Thread Sizes | Custom thread sizes available |
Thread Type | UNC / UNF / Metric Coarse / Metric Fine |
Lengths | From 3mm (1/8") to 50mm (2") standard; custom lengths available |
Plating/Coatings | Black oxide, passivation, zinc, nickel, anodized (for aluminum) |
Torque Specs | Available by size/material request |
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