PTFE / Fluoropolymer-Coated Fasteners
Fluoropolymer coatings (often called by brand names such as Xylan) are organic coatings, usually over a zinc or phosphate base. They give low friction, chemical resistance and color coding, common on offshore and process studs.
Fluoropolymer at a glance
| Typical base | Zinc or phosphate pretreatment |
|---|---|
| Friction | Low: torque must be reduced or tension will overshoot |
| Use | A193 B7 studs offshore and in chemical plants |
| Watch | Coating thickness can affect thread fit; specify it |
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PTFE / fluoropolymer-coated fasteners
What it is
FIELD IDENTIFICATION
Fluoropolymer coatings (often called by brand names such as Xylan) are organic coatings, usually
over a zinc or phosphate base. They give low friction, chemical resistance and color coding, common
on offshore and process studs.
PTFE
Fluoropolymer-coated stud
Fluoropolymer at a glance
Typical base
Zinc or phosphate pretreatment
Friction
Low: torque must be reduced or tension will overshoot
Use
A193 B7 studs offshore and in chemical plants
Watch
Coating thickness can affect thread fit; specify it
Key points
Use torque values from the coating maker or a tensioning procedure; the dry-steel chart will over-tension the stud.
Governing standards: Maker specifications; ASTM A193/A193M-24 for the stud. Editions shown are the latest confirmed as of September 2026. The drawing and the governing
standard always take precedence over this sheet.
torquing any fastener. Verify the current governing standard, project documents, OEM requirements, size, thread, coating and lot certification. To the fullest extent permitted by law, The Fastener App disclaims liability
arising from reliance on this reference.
Fastener Guide reference FG-D244F6 · thefastenerapp.com/fastener-guide/plating-coatings-finishes/ptfe-fluoropolymer-coated-fasteners · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.
