YFluo Xylan PTFE Coated Fastener Series
YFluo Xylan PTFE Coated Fastener Series - Image 2
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YFluo Xylan PTFE Coated Fastener Series

High-performance YFluo (Xylan PTFE) coated fasteners for offshore, oil & gas and chemical environments. Available in multiple standards, grades (12.9, 10.9, 8.8, etc.), materials and Xylan coating options. Low friction, long salt-spray life, multi-color options.

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Description

YFluo Xylan-coated fasteners are high-performance PTFE (Xylan) coated bolts, nuts, studs and socket screws engineered for extreme anti-corrosion applications. The coating combines a PTFE top layer with engineered basecoats to deliver very low friction, long service life, chemical resistance and excellent weather and salt-spray performance — making these fasteners ideal for offshore platforms, marine oil & gas installations, petrochemical plants, nuclear and power equipment, seawater desalination and other high-corrosion environments.

Why choose yFluo xylan coated fasteners

  • Xylan PTFE coating (YFluo series): ultra-thin, high-performance fluoropolymer finish for superior corrosion resistance.
  • Extremely low friction: Coef. of friction 0.08–0.11 (make-up torque reduction up to ~70%).
  • Long salt-spray life: 1,200–4,000 hours (depends on coating grade & substrate).
  • High temperature range: −195 °C to +260 °C continuous.
  • Multiple standards & sizes available: Metric, imperial and many international standards (GB, DIN, ISO, ANSI/ASME, UNI, SH/T, etc.).
  • Materials: Carbon & alloy steels (AISI 4140/4145, 42CrMo, 35CrMo/30CrMo), AISI 304/316 stainless, AISI 410, AISI 1045 and special Cr-Mo-V alloys.
  • Color coded: Blue / Red / Yellow / Green / Silver / Black for easy identification.

Available Product Types & Dimension Standards

  • 1. Hex Head Bolts: GB/T5783, GB/T5782, SH/T3404, DIN 933, DIN 931, ISO 4014, ISO 4017, UNI 5737/5739 (Italy), ASME B18.2.3.1M, B18.2.3.5M, B18.2.3.6M (metric), ANSI/ASME B18.2.1 (US), and other metric/imperial sizes.
  • 2. Hex Socket (Allen) Screws / Countersunk Socket Screws: GB/T70, DIN 912, DIN 7991 (countersunk), ISO 4762, NI5931 (Italy), ANSI/ASME B18.3 (inch) and non-standard/custom sizes.
  • 3. Studs / Double-ended Studs: GB/T897, GB/T898, GB/T899, GB/T900, GB/T901, GB/T9125 (full thread), HG/T20634 (full thread), HG/T20613 (full thread), JB/T4707 (equal length double-end), SH/T3404, NB/T47027 (A/B/C types), DIN 938, DIN 939, IFI136, ASME B18.31.1M (metric), ASME B18.31.2 (inch), and drawing-based non-standard double-end studs. Available A-type (coarse shank), B-type (fine shank), and full thread.
  • 4. Nuts: GB/T6170, GB/T6172, GB/T6175, GB/T9125 (large hex), HG/T20634, HG/T20613, SH/T3404, DIN 934, ISO 4032, ISO 4035, UNI 5587 (heavy), UNI 5588, ANSI UNC/UNF/UN (coarse/fine/8-thread), ASME B18.2.2 (US heavy), ASME B18.2.4.1M / B18.2.4.2M / B18.2.4.3M / B18.2.4.6M (metric hex nuts).
  • 5. Eye / Clevis / Swivel / Special Fasteners: Eye (clevis) bolts per GB/T798, DIN 444, imperial and non-standard shapes. Also flange bolts and other custom/non-standard fasteners available.

Material Options

  • AISI 4140 / AISI 4145 alloy steels
  • AISI 304 (S30400) stainless steel
  • AISI 316 (S31600) stainless steel
  • AISI 410 (S41000) martensitic stainless (referred as “stainless iron”)
  • Cr-Mo-V alloy steels (US standard Cr-Mo-V)
  • AISI 1045 carbon steel
  • 42CrMo, 35CrMo / 30CrMo alloy steels
  • Other customer-specified alloys on request

Mechanical Grades & Specifications

Common grades offered: 12.9, 10.9, 10, 8.8, 8 — plus ASTM/ASME material grades used for high-temperature/high-pressure or special service fasteners:

  • ASTM A193 / A193M: Gr. B7, B7M, B16, B8, B8A, B8M, B8MA, B6, B8-2, B8M-2
  • ASME SA-193 / SA-193M: same grades as above
  • ASTM A194 / A194M: Gr. 2H, 2HM, 4, 6, 7, 7M, 8, 8M, 8A, 8C
  • ASME SA-194 / SA-194M: same grades
  • ASTM A320 / A320M: Gr. L7, L7M, B8, B8A, B8M, B8MA, B8-2, B8M-2
  • ASME SA-320 / SA-320M: same grades

YFluo (Xylan) Coating — Technical Highlights

Coating family: Xylan (PTFE fluoropolymer) basecoats/topcoats — applied as YFluo branded coating grades.

Common YFluo / Xylan grades offered:

  • YFluo 101D (Xylan 1424)
  • YFluo 102E (Xylan 1017 / 1014)
  • YFluo 101B, 102BB (dual coat: basecoat + topcoat, e.g., aluminum-ceramic base + topcoat or zinc-aluminum base + topcoat)
  • YFluo 915F (modified economical grade)

Typical coating parameters (factory target ranges):

  • Dry film thickness (fasteners): 20–25 μm
  • Components/parts: 20–30 μm
  • Coefficient of friction: 0.08–0.11 (can be reduced further in some assemblies)
  • Make-up torque reduction: up to ~70% relative to uncoated steel in many cases
  • Basecoat bond strength: ~4000 psi (indicative)
  • Topcoat pencil hardness: 3H–8H
  • Adhesion (ASTM D3359): 4B–5B
  • Working temperature: −195 °C to +260 °C continuous
  • Color options: Blue, Red, Yellow, Green, Silver, Black (custom color coding available)

Salt spray/corrosion performance: Depending on substrate and pre-treatment, salt spray resistance typically ranges from ~1,200 to 4,000 hours with minimal red rusting (<10–15% surface rust in test windows per grade and pre-treatment).

Pre-treatment / Surface Preparation Options

To maximize coating performance a range of pretreatments are applied depending on substrate and service:

  • Phosphating (including black phosphate)
  • Electroplating zinc (various finishes)
  • Hot-dip galvanizing
  • Zinc-magnesium alloy plating
  • Aluminum-ceramic conversion coatings
  • Other specialty pretreatments for improved adhesion and corrosion resistance

Typical Applications

  • Offshore drilling rigs & platforms (marine environments)
  • Offshore oil & gas engineering & subsea equipment
  • Petrochemical and chemical processing plants
  • Power generation and nuclear industry bolting applications
  • Seawater desalination plants & marine hardware
  • Any installation requiring high-strength fasteners with enhanced corrosion protection and low friction for installation/removal

Benefits & Performance Summary

  • Corrosion protection: PTFE-based Xylan topcoat plus engineered basecoats and pre-treatments provide excellent resistance to seawater, weathering and many chemicals.
  • Installation & maintenance: Low-friction coating reduces make-up and break-off torque, lowering the risk of galling and making future maintenance easier.
  • High temperature & chemical resistance: Suitable across a wide temperature range and stable in many aggressive chemical environments.
  • Wear & abrasion resistance: Engineered filler systems (ceramic/aluminum/PP/PTFE blends) improve wear resistance for long service life.
  • Identification: Multiple color options allow site marking & management by risk or maintenance class.

Typical technical specifications

Attribute Typical Value / Options
Coating system YFluo (Xylan) PTFE topcoat ± engineered basecoat
Coating thickness 20–30 μm (fasteners 20–25 μm)
Friction coefficient 0.08–0.11
Make-up torque reduction up to ~70%
Adhesion ASTM D3359: 4B–5B
Pencil hardness (topcoat) 3H–8H
Working temp −195 °C to +260 °C
Salt spray 1,200–4,000 h (depends on grade & pre-treatment)
Colors Blue, Red, Yellow, Green, Silver, Black
Materials AISI 4140/4145, 42CrMo, 35CrMo, 30CrMo, AISI 1045, AISI 304/316/410, others
Grades 12.9, 10.9, 10, 8.8, 8; ASTM/ASME grades A193/A194/A320 variants