Sigma Fasteners

Manufacture and Distribute Fasteners for Energy

Phone: (281) 214-8800
Fax: (281) 214-8801

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Sigma Fasteners

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. Nano Galv is a replacement for toxic cadmium, traditional galvanizing, epoxy and PTFE coatings.

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. Nano Galv is not to be confused with a hot dip or mechanical galvanizing process and provides bolting with a much cleaner fit and finish.

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.

ZERON 100 Bolts

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ZERON® 100 is a highly alloyed super duplex stainless steel for use in aggressive environments. The combination of properties makes ZERON® 100 the optimum choice in a range of industries. ZERON® 100 is highly resistant to corrosion in a wide range of organic and inorganic acids. The copper content gives excellent resistance to corrosion in many non-oxidizing acids. This alloy is also highly resistant to strong alkalis. ZERON® 100 is not recommended for uses which involve extended exposure to temperatures greater than 300°C (572°F) as there is a substantial reduction in toughness.

660 Bolts

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Grade 660 Bolts

ASTM A453 Grade 660 covers four grades of bolting materials Classes A, B, C, and D  for use in High Strength, Heat Resistance Steel
service such as 660 bolts for pressure vessel and flanges. 

Sigma custom manufaters 660 bolting in Hex bolts, hex nuts, screws, washers, studs, and stud bolts.

L7M Bolts

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ASTM L7M Custom Bolts

ASTM A320 Grade L7M bolting is designned for low temperature sour gas service where there is high concertration of Hydrogen Sulfide gases present in prodcution situation. Per the specification at Sigma Fasteners we have our own heat treating furnace and hardness testing equipmet for onsite L7M modification and hardness testing. All L7M bolts require 100% hardness testing and at Sigma we keep it in house for complete control over the quality your products demand.