Sigma Fasteners

Manufacture and Distribute Fasteners for Energy

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Coated Bolts

NanoGalv®

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NanoGalv®

NanoGalv has a life expectancy years beyond the competition in highly corrosive offshore, energy industrial environments, NanoGalv Fasteners out-perform all currently-specified fastener coatings used in oil and gas.
NanoGalv provides:
• Over 10x corrosion resistance of commonly used systems
• Reduced maintenance
• Less expensive up-front cost over exotic alloys
• Abrasion resistance superior to easily damaged coating systems
• Replacement of toxic cadmium plating and hex chrome passivates
• Reduced downtime and increased production
• Lower total ownership costs

Sigma Fasteners is Licensed by Modumetal
as a QUALIFIED NANOGALV MANUFACTURER

Sigma is qualified to produce Modumetal’s NanoGalv coating process under license and active certification. Certified manufactures meet Modumetal’s analytical and performance criteria in accordance with Modumetal Application Requirements as outlined in ARD-PD075:19-0916. This certification applies to specific production equipment within the specified production facility with capacity listed. Sigma as a Qualified NanoGalv licensee is subject to ongoing certification requirements. Click here to verify current status: NanoGalv Qualified Manufacturers

NanoGalv® Coated Bolts

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NanoGalv®

NanoGalv has a life expectancy years beyond the competition in highly corrosive offshore, energy industrial environments. NanoGalv Fasteners out-perform all other specified fastener coatings used in oil and gas.

NanoGalv provides:

  • Over 10x corrosion resistance of commonly used systems
  • Reduced maintenance
  • Less expensive up-front cost over exotic alloys
  • Abrasion resistance superior to easily damaged coating systems
  • Removal of toxic cadmium plating and hex chrome passivates

Reduced downtime and increased productionMore corrosion resistant than any other fastener coating on the market NanoGalv® Fasteners prevent critical failures, improve safety and provide 3x ROI. Corrosion is the oil and gas industry’s most expensive and persistent adversary. Corrosion Compromises the function and safety of essential bolting and infrastructure. Replacing corroded fasteners is costly and potentially dangerous, leading to increased maintenance overhead and increased downtime. NanoGalv bolting overturns this problem by providing a licensed and patented nanolaminated coating system. This improve process improves corrosion resistance by more than 10x, setting an entirely new standard for the durability, longevity and production of upstream oil and gas infrastructure applications. Oilfield operators generally have two options when assessing materials. The first is to select a low-budget material with the understanding it cannot withstand highly corrosive environments and will thus require regular replacement or operators may opt for a higher performance metals and the hefty price tag that comes along with it. NanoGalv upends that dynamic.

NanoGalv coated nuts and bolts offer a new choice in the form of nanolaminated materials, a new breed of coated metal designed to address a growing challenge. NanoGalv with nano-scale layers allow precise control over the fastener substrates providing unprecedented levels of performance in corrosion resistance, strength, hardness, and wear resistance.

SermaGard Coated Bolts

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ASTM F1428 – 92(2005) – Standard Specification for Aluminum Particle-Filled Basecoat/Organic or Inorganic Topcoat, Corrosion Protective Coatings for Fasteners

The ASTM F1428 specification as applied by Sigma Fasteners covers the corrosion-resistant coating system consisting of an inorganic aluminum particle-filled basecoat (SermaGard 1105) and an organic topcoat (SermaGard 1280 or Xylan 1014). The SermaGard basecoat is a water soluble slurry containing aluminum particles, a ceramic oxide pigment dispersed in a liquid binder of chromate/phosphate compounds. The organic topcoat consist of polymer and / or Fluoropolymer resins and pigments. At Sigma Fasteners these coatings are applied by conventional spray methods. The maximum service temperature of the coating system is 450° F (230° C). The coating system has a low susceptibility to inducing hydrogen embrittlement in steel parts of tensile strengths ≥ than 1000 MPa (≈RC31)

This coating system specification can be applied to alloy steels (ASTM A193 Grade B7),  ferritic and austenitic stainless steels (ASTM A193 GradeB8 and Grade B8M).

This coating system is in use in major offshore drilling, chemical and petrochemical facilities in the United States and worldwide.

SermaGard 1105 (ASTM F1428)

Sigma Fasteners is a licensed applicator for SermaGard products. 1105 is a ceramic-metallic sprayed
basecoat that at 1 mil of thickness or more affords 3000-4000 hours of ASTM B117 salt spray resistance,
with an appropriate topcoat. It can be used at high temperatures. It is extremely effective in salt
atmospheres. The SermaGard 1105 process involves curing at high temperatures (Minimum of 750 deg.
F) and subsequent burnishing with appropriate blast media to achieve conductivity. SermaGard 1105
contains aluminum flake.

SermaGard 1280

SermaGard 1280 is a fluorocarbon topcoat, which when applied to SermaGard 1105 basecoat gives
superior corrosion resistance and UV protection.

Moly Coated Bolts

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Moly Coated Bolts

Molybdenum disulfide coated bolts are commonly used to improve the performance in extremes of load carrying capacity, operating temperature and coefficient of friction. This coating provides effective lubrication in a wide range of loads, in many cases exceeding 250,000 psi. Moly coatings lubricate sacrificially by transferring lubricant between the two mating surfaces, which helps to reduce both wear and the coefficient of friction.

Moly coatings are a combination of molybdenum disulfide lubricant and high performance resins. The coating is thermally cured to bond thoroughly with the base metal of the coated part.

Moly coated bolts can solve problems associated with corrosion, chemical exposure, and abrasion. offer excellent corrosion and chemical resistance and a barrier protection better than phosphate. With Moly’s exceptional barrier protection, it is appropriate for more severe environments and is often used in chemical processing and oil field equipment.

Xylan Coated Bolts

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Xylan Coated Bolts
Xylan Coated Bolts

Xylan Coated Bolts

Xylan 1010, 1070, 1014, 1052 and now 1424 have been used as bolt coatings for almost a quarter century now. Most major Oil and Chemical Companies recognizing that maintenance is a huge issue have made coated bolt specifications for bolted high pressure flange connections. The various properties on the Xylan give excellent make up and brake out torque and reduce the need for high risk cutting torches or high cost bolt cutting when maintenance is required.

Xylan 1014 in bolt coatings used for its good lubricity, chemical and abrasion resistance.

Xylan 1052 for coated bolts used for its excellent lubricity.

Xylan 1070 and 1010 where the pioneers in the field – used for the lubricity and chemical inertness.

With VOCs an ever present issue these days Whitford has made a low VOC version 1424 which Sigma applies to achieve the results need in a coated bolt connection and to stay complaint in a green economy.

Xylan coated bolts come in many tints and the coated bolts are often coordinated with standard corporate color branding schemes. While very light shades are possible most of the popular hues range from a Dark Yellow to black with Reds and Blues and greens being the most widespread.

Zinc Phosphate Coating

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Zinc Phosphate coating is a crystalline conversion coating that is formed on a metal substrate. The phosphate process relies on the chemical reaction between the metal and the mildly acidic phosphate liquid to form insoluble crystalline phosphates on the surface of the part.

The phosphate coating is used as a pretreatment prior to painting, increasing corrosion protection, and providing for a better adhesion of the coating system.

When phos is used alone or in combination with oil (phos and oil) it lowers friction characteristics of sliding components or threaded parts. While typically called phos coating, phosphate alone has poor rust inhibiting characteristics and must be used in combination with oil or a top coat for corrosion protection. Zinc Phosphate can be applied to Ferric metals, but has no effect on Stainless Steel.

Phosphate Coating Characteristics
Color: dark gray / black
Typical Use: Anti –Galling/Basecoat
Top Coat: Oil or Paint