Xylan PTFE Coated T-Bolt | Anti-Corrosion T-Head Bolt with Nut for Marine Deck Equipment

The Xylan PTFE coated T-bolt is a specialty marine fastener that combines the anti-rotation locking geometry of a T-head bolt with the long-term corrosion protection of a fluoropolymer coating. Designed for deck track, equipment rail, and cable tray applications where access to the bolt head is restricted after installation, this fastener delivers salt-spray resistance without the weight penalty of solid stainless steel. Supplied as a matched bolt-and-nut set, each batch ships with EN 10204 3.1 material certification and full dimensional traceability.

What Is a Xylan PTFE Coated T-Bolt

A T-bolt (also called T-head bolt, hammer head bolt, or T-slot bolt) features a flat rectangular head that slides into a T-slot track or channel rail. After insertion, the head is rotated 90 degrees so the rectangular profile locks against the slot walls, preventing the bolt from spinning during nut tightening. This mechanical anti-rotation action eliminates the need to hold the bolt head from the back side, making T-bolts ideal for blind-mount installations on ship decks, machinery rails, and structural brackets.

TheXylan 1424 PTFE coating applied to these T-bolts is a fluoropolymer coating system manufactured by Whitford Worldwide. Xylan 1424 contains PTFE (polytetrafluoroethylene) particles suspended in a thermoset resin binder, applied as a liquid spray to approximately 25-35 micrometers dry film thickness, then heat-cured. The resulting blue-grey finish provides a combination of low friction coefficient (approximately 0.15-0.20), broad chemical resistance, and sustained corrosion protection in marine topside and splash-zone environments.

Why Xylan PTFE Coating for Marine T-Bolts

Carbon steel T-bolts offer higher tensile strength and lower cost than solid stainless steel, but they require reliable corrosion protection. Xylan PTFE coating addresses three challenges simultaneously:

Compared to hot-dip galvanizing, Xylan coating provides a significantly thinner film (25-35 um versus 45-85 um), which preserves thread fit accuracy on T-head bolts where dimensional tolerance is critical for T-slot engagement. The blue-grey finish also provides immediate visual identification during installation and inspection, reducing the risk of mixing coated and uncoated fasteners on site.

Technical Specifications

Marine Applications for Xylan Coated T-Bolts

Material Grades and Coating Options

For the majority of topside marine applications, Grade 8.8 with Xylan PTFE coating provides the optimal balance of strength, corrosion resistance, and cost. The coating thickness of 25-35 um preserves thread engagement accuracy in the T-slot while delivering salt spray performance exceeding 3000 hours. For applications involving continuous seawater immersion — such as subsea piping clamps or underwater structural connections — solid A4-70 (316) stainless steel is the appropriate choice.

How to Specify a Xylan T-Bolt

When ordering Xylan PTFE coated T-bolts, provide the following information to ensure correct supply:

Quality Assurance and Traceability

Every batch of Xylan PTFE coated T-bolts is manufactured under controlled conditions with the following quality measures:

• Raw material: medium-carbon alloy steel, incoming inspection per purchase specification
• Heat treatment: quench and temper to achieve Grade 8.8 mechanical properties (Rm = 800 MPa, Rp0.2 = 640 MPa)
• Dimensional inspection: T-head width, head thickness, shank diameter, thread gauge check (go/no-go)
• Coating application: Xylan 1424 sprayed to controlled wet film thickness, oven-cured per Whitford recommended schedule
• Coating inspection: dry film thickness measurement (25-35 um target), adhesion check, visual inspection for runs or holidays
• Documentation: EN 10204 3.1 material certificate per batch; dimensional report available on request
• Third-party inspection available upon request for marine classification society projects

Frequently Asked Questions

What is the difference between Xylan and regular paint coating

Xylan is a fluoropolymer coating system that contains PTFE particles suspended in a thermoset resin binder. Unlike conventional paint, which provides only a barrier layer, Xylan combines corrosion protection with a low-friction surface (coefficient of friction approximately 0.15-0.20). This makes Xylan-coated T-bolts significantly easier to install and remove compared to painted fasteners, and the coating resists salt spray for 3000+ hours per ASTM B117 testing. Xylan is specifically designed for industrial fastener applications, not general-purpose painting.

Can Xylan T-bolts be used in seawater immersion service

Xylan 1424 coating performs excellently in topside and splash-zone marine environments. However, for continuous seawater immersion — such as subsea piping, underwater structural connections, or ballast tank internals — we recommend solid A4-70 (316 stainless steel) T-bolts instead. The Xylan coating can be damaged by sustained immersion and mechanical abrasion in submerged service, which would expose the carbon steel substrate to direct seawater attack.

What is the maximum service temperature for Xylan 1424

Per Whitford data sheet, Xylan 1424 has a continuous service temperature range of -50 deg C to +290 deg C. This covers virtually all marine deck and engine room applications. For environments exceeding 290 deg C, alternative high-temperature coatings such as Xylan 1014 (rated to +260 deg C with different characteristics) or inorganic zinc silicate should be considered. Please consult our technical team for specific temperature requirements.

How does Xylan coating affect the T-head fit in the T-slot

The Xylan 1424 coating adds approximately 25-35 micrometers of film thickness, which is negligible relative to typical T-slot clearances (0.5-1.0 mm per side). The coating does not affect the T-head slide-and-lock engagement. In fact, the low-friction PTFE surface makes the initial insertion and 90-degree rotation smoother, reducing installation effort on tight-fit tracks.