Galvanic Corrosion Chart
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Southco Access Fasteners

Southco delivers innovative, engineered access hardware solutions designed to enhance the "touch points" of customer products. Southco leverages its global resources to deliver proven solutions which can reduce the overall costs and cycle time of customer projects.

To find out more about the Southco range of access hardware solutions, please click below.


Avdel Blind Fasteners

Quality, Innovation and Expertise are the key elements of the Avdel range of fasteners. Avdel focuses on identifying new product improvements whilst constantly updating its range of fastening solutions to help customers maximise output and profitability. The Avdel range includes Blind Rivets, Speed Fasteners and Rivet Nut systems, as well as high quality pneumatic tooling.

To find out more about the Avdel range of fasteners, please click below.


Pem Self-Clinching Fasteners

PEM is a global leader in the manufacture of Clinch Fasteners, providing fastener and fastener installation design and product solutions, utilizing a unique self-clinching technology to provide strong, reusable and permanent threads and mounting points in thin sheetmetal and PC Boards.

For more information on the PEM range of fasteners, please click below.





BBA High Performance Rivet Nuts

BBA produce a range of high quality inserts designed to provide a solution for certain specialist applications. Using a unique and patented design, BCT rivet nuts from BBA bring a whole new level of versatility and performance to manufacturing.


  • High performance rivet nuts for difficult applications
  • Can be used in materials such as GRP, Carbon fibre, plastics etc as well as all metals.
  • Suitable for thicker materials
  • Exceptional thread strength and high resistance to turning in the application.
  • Available in steel, aluminium, brass and A2 or A4 stainless steel.

To find out more about the BBA range of inserts, please click the button below


Zygology Value Rivet Nuts


Value Rivet Nuts

The most cost effective method of installing a full depth thread in thin gauge materials, Value Rivet Nuts come in a variety of forms. Ideal for use in drilled or punched holes, Value Rivet Nuts are installed from one side making them especially suitable for tube, box sections or tight corners. A comprehensive range of inserts is available in a large range of metric thread sizes to suit most applications.

Zygology Value rivet nuts offer the following benefits:
  • Excellent value for money
  • a wide range of body styles and thread sizes
  • Excellent quality
  • available in steel and stainless steel
  • RoHS compliant
  • specials available to special order


Click here for more information



Gesipa - The experts in blind riveting

Zygology is a Master Distributor For Gesipa UK. This means that we can assist with advice on product selection, problem solving as well as the supply of Gesipa products. Currently we can offer a fast turn around on fasteners, and tools from stock.
Shown below are examples of just  some of the products Gesipa manufactures.
GESIPA’s PolyGrip rivets feature a wide grip range enabling a single Polygrip to replace up to 3 lengths of standard blind rivets. The PolyGrip’s hole-filling rivet body expands within the application material for better joint integrity. The large blind-side closing head with locked mandrel core provides better support and improved sealing for weather resistance. Polygrips are available in three head styles. Material choices include Aluminum, Steel and Stainless Steel.
GESIPA Dome Peel rivets split into four legs providing a large blind side bearing head for improved support in brittle, soft or ductile materials.
GESIPA Tri-fold rivets form three folded legs that distribute the fastener's clamp-load over a larger blind side head formation. The larger blind side offers increased pull-through resistance in soft and ductile material applications. Tri-fold rivets are used in automotive applications such as plastic body panels, trim, and interior components.     
GESIPA manufactures a complete line of Extra Length metric blind rivets according to DIN7337 standards in 3 mm, 4 mm, 4.8 mm, 5 mm, 6 mm and 6.4 mm diameters. Material choices include Aluminum/Steel, Steel/Steel, as well as 304 and 316 Alloy Stainless Steel. XL-Metric     XL-Metric-set
GESIPA’s Mega-Grip is a high strength multigrip structural blind rivet. The flush-break mechanically locked mandrel core improves weather resistance and provides higher shear strength. During setting the rivet body expands within the application material to provide complete hole-fill for tighter joints. Mega-Grips are offered in three head styles: Dome, Large Flange and Countersunk. Material choices include Aluminum and Steel.
GESIPA’s G-Bulb is a high strength structural blind rivet. Designed for thinner material applications, the G-Bulb forms a large blind-side closing head, providing better material support and higher pull-through resistance. High shear strength is achieved by the locked mandrel core. Material choices include Steel and Stainless Steel.
GESIPA’s Bulb-tites are the original high-strength structural tri-folding blind rivets. The comprehensive Bulb-tite product line includes 10 unique series, offering a broad range of diameters, head styles and material choices.
GESIPA produces a comprehensive range of air tools capable of setting all types of blind and structural rivets. The Tuarus range offers fast cycle times combined with flexibilty and ease of use

For those with out access to compressed air GESIPA produces a range of re-chargeable battry powered tools suitable for placing blind rivets up to 6.4 MM in diameter and rivet nuts up to M8.

For more information on Gesipa products please click here

Galvanic Corrosion Chart
All dissimilar materials have the potential to react with each other when they are brought together in the presence of a catalyst. In most circumstances this reaction is so mild as to be of no importance, but when the wrong materials are used in combination and then exposed to an electrolyte such as water the effects can become much more noticeable. For applications where humidity is low then you can generally ignore galvanic corrosion. If on the other hand you are working on a project for use in damp conditions or outside then it is best to pay some regard to the possible effects of galvanic corrosion.

As a rule it is best to use metals which are as close together as possible in the table below. Doing this will help to eliminate any possibility of galvanic corrosion. If you do have to mix materials then take a look at the galvanic compatibility section.

Active (Anodic) Most Likely To Corrode
Magnesium alloys
Zinc (hot-dip, die cast, or plated)
Aluminium 1100, 3003, 3004, 5052, 6053
Tin (plated)
Steel 1010
Iron (cast)
Stainless steel 410 (active)
Copper (plated, cast, or wrought)
Nickel (plated)
Chromium (Plated)
Stainless steel 301,304,310 (active)
Stainless steel 430 (active)
Nickel-silver (18% Ni)
Stainless steel 316L (active)
Bronze 220
Copper 110
Red Brass
Stainless steel 347 (active)
Copper-nickel 715
 Admiralty brass
Stainless steel 202 (active)
Bronze, Phosphor 
Monel 400
Stainless steel 201 (active)
Stainless steel 321 (active)
Stainless steel 316 (active)
Stainless steel 309 (active)
Stainless steel 17-7PH (passive)
Silicone Bronze 655
Stainless steel 301,304,321 (passive)
Stainless steel 201,286 (passive)
Stainless steel 316L (passive)
Stainless steel 202 (passive)
Noble (Cathodic) Least Likely To Corrode
Galvanic Compatibility

Often when design requires that dissimilar metals come in contact, the galvanic compatibility is managed by finishes and plating. The finishing and plating selected facilitate the dissimilar materials being in contact and protect the base materials from corrosion.

  • For harsh environments, such as outdoors, high humidity, and salt environments fall into this category. Typically there should be not more than 0.15 V difference in the "Anodic Index". For example; silver - nickel would have a difference of 0.15V being acceptable.
  • For normal environments, such as storage in warehouses or non-temperature and humidity controlled environments. Typically there should not be more than 0.25 V difference in the "Anodic Index".
  • For controlled environments, such that are temperature and humidity controlled, 0.50 V can be tolerated. Caution should be maintained when deciding for this application as humidity and temperature do vary from regions.
Anodic Index
Index (Volts)
Silver, solid or plated; monel metal. High nickel-copper alloys
Nickel, solid or plated, titanium an s alloys, Monel
Copper, solid or plated; low brasses or bronzes; silver solder; German silvery high copper-nickel alloys; nickel-chromium alloys
Brass and bronzes
High brasses and bronzes
18% chromium type corrosion-resistant steels
Chromium plated; tin plated; 12% chromium type corrosion-resistant steels
Tin-plate; tin-lead solder
Lead, solid or plated; high lead alloys
Aluminum, wrought alloys of the 2000 Series
Iron, wrought, gray or malleable, plain carbon and low alloy steels
Aluminum, wrought alloys other than 2000 Series aluminum, cast alloys of the silicon type
Aluminum, cast alloys other than silicon type, cadmium, plated and chromate
Hot-dip-zinc plate; galvanized steel
Zinc, wrought; zinc-base die-casting alloys; zinc plated
Magnesium & magnesium-base alloys, cast or wrought
Please Note: Galvanic corrosion is a complex problem with many variables which are difficult to predict. The information above is provided for guidance only - and is only a short summary of the issues involved. Zygology Ltd can take no responsibility for application failure resulting from errors or omissions in the data provided.
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Our Galvanic Corrosion Chart shows which metals are most and which are least likely to be effected. This information is important to consider when producing fixtures and assembly solutions for use in damp conditions or outside Copyright Zygology Ltd 2015. Website design by Saturn Innovation