McKINNON CHAINS SIMPLIFIED
Chain is self-preserving, that is, it has opposing forces at work when it is used, at every compression point it has a tensile stress opposing it, and vice versa this is the reason that chain breaks where the opposing forces meet which is between the crown and the barrel.
CONFIGIRATION
Short link = material diameter x 3 = pitch
Long link = material diameter x 4 = pitch
Extra long link = material diameter x 6 = pitch
Other chains include conveyor chains and calibrated chain
The pitch is the inside link length of the chain
McKINNON CHAIN GRADES
Grade 3 (30) (300) Mild Steel
Typical applications
Hardware chain
Mining chain (pipe roof support)
Grade 4 (40) (400) Mild Steel
Typical applications
Transport chain
Lashing chain
Grade 5(50) (500) High Tensile
Typical applications
General-purpose mining applications
Grade 6 (60) (600) Super 6 High Tensile
Typical applications
Mining chain (rigging)
Agricultural chain (sugar cane harvesting)
Grade 7 (70) (700) High Tensile
Typical applications
Fishing chain (trawling)
Aquaculture (chain cages)
Lashing (tie-downs)
Grade 8 (80) (800) Max – Alloy
Typical applications
Overhead lifting (slings)
Grade 8+ fishing chain - Alloy
Typical applications
Fishing chain (trawling)
Aquaculture (chain cages)
Grade 100 short link alloy lifting chain
Typical applications
Overhead lifting (slings)
The three-digit number relates to the minimum specified tensile strength in MPA
McKINNON CHAIN SPECIFICATIONS
As mass chain suppliers, we comply to national and international standards with the required type approval standards.
The most common standards are:
SANS 251 for long and extra-long link chains
SANS 189 for short link steel chain
SANS4778- Chain slings of welded construction (Grade 8)
DNV type approval for offshore lifting (containers and oil rigs)
Noorddeutsch Metall beruffsgenosshenschaft (H mark – H46) requirement for selling lifting chain into most European countries
EN 818, BS EN, EN12079,(part 1+2)
McKINNON CHAIN COATINGS
Natural finish
A natural chain quality is excellent it is susceptible to the elements and rust with time is inevitable.
Hot-dip galvanized
Thick zinc coating applied using a molten zinc bath with resultant good anti-corrosive properties. Can only be used for grade 3-Grade 7 chain.
Zinc Thermal diffused chain
The protective layer consists of three distinct Iron Zinc alloy layers after zinc has diffused into the steel. The process typically takes place at temperatures between 380 and 400 ºC. Apart from excellent anti-corrosion properties it also has excellent abrasion resistance, anti-spark properties, and freedom from any type of embrittlement. Available in chain grades 3-8.
Normally used in harsh environments such as offshore/marine.
Electro galvanized or electroplated chain
This is a chemical process and gives a good appearance as well as protection from the elements. Normally used on hardware chain.
McKINNON CHAIN GEOGRAPHICAL FOOTPRINT
South Africa and
sub-Saharan Africa
Zimbabwe
Mozambique
Zambia
Namibia
Ghana
Kenya
United Kingdom
Europe
Netherlands
Norway
Denmark
Belgium
Italy
Poland
Germany
USA
Latin America
Panama
Mexico
Asia
Japan
Hong Kong
South Korea
Taiwan
Singapore
Australia
South America
Brazil
Chile
Peru
Ecuador