DURAFENCE Kenya: Ultimate Fencing Terminology & Buyer’s Glossary
Executive Summary & Quality Framework
Whether you are securing a commercial facility in Nairobi, managing an agricultural perimeter upcountry, or specifying heavy-duty security enclosures along the coast, choosing the right fencing components requires a clear technical understanding.
This categorized technical glossary breaks down key terminology for DURAFENCE products in Kenya—spanning raw steel grades, protective anti-corrosion coatings, wire processing, mesh configurations, and installation hardware.
Adherence to Kenya Bureau of Standards (KEBS) guidelines is essential when specifying, procuring, or installing commercial and residential perimeter fencing systems. KEBS certification ensures structural integrity, accurate wire gauge thickness, tensile resilience, and sufficient zinc coating mass to prevent premature atmospheric corrosion.
Uncertified materials often suffer from undersized wire gauges, brittle zinc layers, and rapid rusting—leading to failure within 12–24 months under Kenyan climatic conditions (notably high humidity along coastal regions like Mombasa and seasonal rain cycles in the highlands).
Relevant KEBS Standards for Fencing Materials
KEBS Reference | Scope & Coverage | Key Technical Requirements |
KS EAS 135:1999 | Steel Wire & Products for Fencing | Defines mechanical properties, wire diameter tolerances, and minimum coating mass for chainlink mesh, barbed wire, and tension line wires. |
KS 06-549 / KS EAS 135 | Hot-Dipped Galvanized Barbed Wire | Specifies strand wire tensile strength (~900 N/mm²), barb wire tensile strength (350–550 N/mm²), barb spacing (75mm standard), and roll lengths. |
KS ISO 1461 | Hot Dip Galvanized Coatings on Iron & Steel | Establishes minimum coating thickness and mass per square meter for structural steel fence posts, Y-section strainers, and brackets. |
KS 2680 | Woven Wire Fence Fabric (Chain Link Mesh) | Specifies standard roll lengths (18m), mesh aperture sizes (50x50mm, 80x80mm), wire gauges (10G to 15G), and knuckled/twisted edge finishes. |
KS 1757 / KS ISO 6935 | Steel for Structural & Reinforcement Use | Governs mild steel flat bars, angle bars, hollow sections (CHS/RHS), and profile bars used in post assembly and structural perimeter frame fabrications. |
Quick Reference: Core Steel & Coating Comparison
Specification
Primary Characteristics
Ideal Kenyan Environment / Application
Q195 Steel
Yield Strength ≥ 195 MPa; highly ductile
Light-duty wire products, binding, tie wire
Q235 Steel
Yield Strength ≥ 235 MPa; structural baseline
Standard fence posts, gates, chain link mesh
Q345 Steel
Yield Strength ≥ 345 MPa; high tensile
High-security perimeter posts, heavy gates, bollards
Electro-Galvanized
5–25 µm zinc layer; smooth, bright finish
Indoor partitions, decorative screens, dry environments
Hot-Dip Galvanized
45–200 µm zinc layer; thick alloy bond
Harsh outdoor environments, agricultural, high rainfall
PVC-Coated Wire
Heavy zinc base + 0.4–1.0mm PVC jacket
Coastal regions (Mombasa / Malindi), high-humidity areas
Raw Materials & Steel Grades
Carbon Steel:Steel composed primarily of iron and carbon (0.05%–2.0% carbon) without large proportions of alloy elements. It serves as the primary base material for structural fence posts, wire mesh, and gate fabrications.
- Related Terms: Mild Steel, Low Carbon Steel, Q235, Q345
Low Carbon Steel (Mild Steel)
Steel containing ≤ 0.25% carbon. It is soft, ductile, cost-effective, and exceptionally easy to weld or form, making it the most common steel for general fencing applications.
- Common Industry Grades: Q195, Q235, SPCC, DC01
- Applications: Chain link mesh, welded panels, fence posts, tie wire
Q195 Steel
A Chinese standard low-carbon steel grade featuring a yield strength of ≥ 195 MPa.
- Standard: GB/T 700 (Approximate ASTM equivalent: ASTM A36 / JIS SS400)
- Key Advantage: Highly flexible and easy to draw into light-duty wires.
Q235 Steel
The industry benchmark low-carbon structural steel grade in Kenya and internationally, providing a yield strength of ≥ 235 MPa.
- Standard: GB/T 700 (Equivalent to ASTM A36, EN S235JR)
- Grades: Q235A through Q235D (offering increasing levels of toughness and impact resistance)
- Applications: DURAFENCE fence posts, welded mesh panels, gates, and structural brackets
Q345 Steel
A high-strength, low-alloy (HSLA) steel with a yield strength of ≥ 345 MPa. Designed for heavy structural loads and high-security installations.
- Standard: GB/T 1591 (Equivalent to ASTM A572 Grade 50, EN S355JR)
- Applications: High-security perimeter posts, heavy-duty sliding gates, security bollards
Corten Steel (Weathering Steel)
A low-alloy steel (Iron + Copper + Chromium + Nickel) that develops a self-protecting, stable rust patina when exposed to atmospheric weather, eliminating the need for painting.
- Standards: ASTM A588, EN 10025-5 (S355J2W)
- Applications: Architectural facade panels, decorative security screens, landscape borders
Stainless Steel
An alloy containing a minimum of 10.5% chromium, creating a passive chromium oxide surface film that blocks rust and oxidation.
- Common Grades: Grade 304 (General use), Grade 316 (Marine grade for coastal environments), Grade 430
- Applications: Coastal razor wire, high-corrosion chemical zones, premium fittings
Recycled Steel
Steel manufactured using scrap metal processed through an Electric Arc Furnace (EAF). Consumes 60% less energy and produces 70% lower CO₂ emissions compared to virgin steel production.
Wire Processing & Physical Properties
Core Wire
The raw, uncoated inner steel wire before protective galvanizing or PVC jacketing is applied.
Drawn Wire
Wire created through the mechanical process of drawing—pulling wire rod through progressively smaller tungsten carbide dies to reduce its diameter and boost tensile strength.
Hard-Drawn Wire
Wire drawn to high tensile strength (1,000–1,800 MPa) without subsequent heat treatment. Offers high structural rigidity but low ductility.
- Applications: Rigid welded wire mesh panels, heavy-duty chain link
Annealed Wire
Wire that undergoes controlled heat treatment (650–750°C) followed by slow cooling. This softens the metal, relieves internal stress, and maximizes ductility.
- Applications: Binding wire, rebar tying wire, flexible woven netting
Black Annealed Wire
Annealed wire processed in an atmospheric furnace, leaving a light black oxide finish. Soft, economical, and flexible.
- Primary Uses: Rebar binding, temporary site bundling
Bright Wire
Unannealed wire drawn clean through dies without thermal treatment, yielding a shiny, smooth surface and high structural stiffness.
Ductility
The mechanical property describing a wire’s ability to deform, bend, or stretch under tensile stress without cracking or snapping. Critical for chain link weaving and manual wire twisting during installation.
Wire Types, Security & Mesh Enclosures
Barbed Wire
A classic security and agricultural fencing product featuring sharp barbs twisted onto a single or double strand wire at standard intervals (75–150mm).
- Standards: ASTM A121, EN 10223-2
Razor Wire / Concertina Wire / Barbed Tape
A high-security perimeter deterrent composed of continuous high-tensile wire bound with punched steel tape featuring sharp razor blades. Expands in accordion-like coils (diameter range 450–980mm).
- Configurations: Single coil, cross-clipped double coil (Concertina)
- Blade Profiles: Short barb (10–15mm), Medium barb (20–25mm), Long barb (60–65mm)
Chain Link Wire / Diamond Mesh
A woven fence fabric formed by twisting wire into a signature interlocking diamond pattern.
- Standard Wire Diameters:0mm to 4.0mm
- Common Mesh Sizes: 25mm, 50mm, 60mm, 75mm
- Standard Heights:9m up to 4.0m
Welded Wire Mesh
A rigid grid formed by electric resistance welding at every wire intersection. Provides high structural integrity and clean sightlines.
- Standard Wire Diameters:0mm to 8.0mm
- Applications: Security fence panels, concrete reinforcement, agricultural cages
Welded Mesh Fence Panel
Modular rigid fence sections engineered from heavy gauge welded wire. Mounted using clips, clamp bars, or bolts onto line posts.
- Finishes: Hot-dip galvanized, thermoset powder-coated, or PVC-dipped
Hexagonal Wire Netting (Chicken Wire)
Lightweight mesh featuring hexagonal six-sided woven openings.
- Typical Wire Diameters:7mm to 1.2mm
- Applications: Poultry coops, small animal enclosures, garden protection, plastering reinforcement
Crimped Wire Mesh
Woven mesh built from wires that are pre-crimped (wavy deformation) prior to weaving, locking the intersections tightly without welding.
Expanded Metal
A continuous metal sheet that is simultaneously slit and stretched into a seamless diamond-patterned lattice. Contains no welds or joints, maximizing structural strength per kilogram.
Perforated Metal
Solid metal sheet punched with uniform rows or staggered patterns of round, square, or slotted holes.
- Open Area Ratio: Typically ranges between 20% and 60%
Temporary Fence
Free-standing, modular panel systems with concrete or flat-steel feet for short-term perimeter containment, public crowd control, or construction site safety.
Anti-Corrosion Coatings & Protective Finishes
Buyer Tip for Kenya: For high-humidity or coastal regions (Mombasa, Malindi, Kilifi), always specify Hot-Dip Galvanized or PVC-Coated steel to prevent premature rust caused by airborne salt spray.
Zinc Coating
A protective barrier layer applied to steel. Zinc acts as a sacrificial anode, corroding preferentially to preserve the underlying iron even if scratched.
Electro-Galvanizing
An electroplating process that deposits a thin, uniform layer of zinc (5–25 µm) using an electric current.
- Appearance: Smooth, bright aesthetic finish
- Best For: Indoor partitions or light outdoor exposure requiring subsequent paint application
Hot-Dip Galvanizing (HDG)
The process of immersing cleaned steel into a bath of molten zinc at approximately 450°C. This forms a series of iron-zinc alloy metallurgical layers topped with pure zinc.
- Coating Thickness: 45–200 µm (350–600 g/m²)
- Lifespan: 20 to 50+ years depending on local climate
- Standards: ISO 1461, ASTM A123, ASTM A153
PVC Coating (Vinyl Coating)
A plastic coating applied via extrusion or dip-molding over hot-dip galvanized wire to provide dual barrier protection against water, UV rays, and corrosive salt air.
- Coating Thickness:4mm to 1.0mm
- Popular Colors: Dark Green, Charcoal Black, White
Powder Coating
An electrostatic application of dry polymer powder cured under heat (160–210°C) to form a tough, chip-resistant, decorative color finish.
- Typical Thickness: 60–120 µm
- Resins: Outdoor-grade UV-resistant Polyester
Manufacturing & Metal Processing Terms
Wire Drawing
The core process of pulling solid steel rod through tapered dies to reduce cross-section diameter while increasing tensile strength.
Weaving
Interlacing wires over and under on industrial automated looms to produce continuous rolls of chain link mesh or flexible screens.
Resistance Welding
Using high-amperage electrical current applied under pressure at wire intersections to fuse the metal instantly without needing external filler metal.
Bending & Pressing
Deforming tube stock or sheet metal with press brakes or rollers to form post brackets, clamp profiles, or gate frames.
Punching & Shearing
Stamping clean holes or cutting precise lengths in sheet steel and post walls using precision punch and die tooling sets.
Cold & Hot Rolling
Passing steel billets or sheets between rollers to reduce thickness or produce structural channels (e.g., Cold-Rolled vs Hot-Rolled profiles).
Dimensions, Gauges & Measurement Standards
Wire Diameter
The actual cross-sectional thickness of a wire, measured directly in millimeters (mm).
Wire Gauge (BWG / SWG)
A traditional numbering system for measuring wire and sheet metal thickness.
- Rule of Thumb: The gauge scale is inverted—a smaller gauge number indicates a thicker wire.
Gauge (BWG) | Metric Diameter | Common Usage in Kenya |
8 Gauge | 4.00 mm | Heavy-duty post stay wires, security mesh |
10 Gauge | 3.20 mm | Standard high-tensile chain link |
12.5 Gauge | 2.5 mm | Commercial chain link & barbed wire |
14 Gauge | 2.0 mm | Light-duty mesh, binding applications |
16 Gauge | 1.6 mm | Fine binding wire, light netting |
Aperture & Mesh Size
The dimension of the open space between adjacent parallel wires in a mesh.
- Square / Rectangular Mesh: Specified as Width × Height (e.g., 50 × 50mm or 50 × 200mm)
- Diamond Mesh: Measured diagonally across the inner opening
Mesh Count
The total number of open apertures per linear inch (25.4mm). Commonly used for fine woven wire screens and filtration meshes.
Fence Posts, Hardware & System Components
Line Post (Intermediate Post)
Standard vertical support posts installed at regular intervals along a straight fence line. Supports the weight of the mesh but does not bear structural tension loads.
Terminal Post (End, Corner & Gate Posts)
Heavy-duty, thicker-walled posts installed at fence ends, corners, and gate openings. Designed to withstand high tensile pull forces from stretched wire and mesh.
- End Post: Located at the start or finish of a fence run.
- Corner Post: Positioned at directional changes (usually supported by diagonal struts/braces).
- Gate Post: Reinforced post engineered to hold heavy swing or slide gates.
Post Cap
A protective cover fitted over the top of hollow post profiles to prevent rainwater accumulation, internal rust, and insect entry. Available as flat caps, dome caps, or decorative finials.
Top Rail
A horizontal steel pipe running continuously along the top of line posts to stabilize the fence top and prevent fabric sagging.
Tension Wire
A high-tensile spring-steel wire stretched along the top or bottom of a chain link fence line as a lower-cost, flexible alternative to a solid top rail.
Tension Bar
A flat vertical steel bar threaded through the final weave of a chain link mesh panel and clamped to a terminal post, distributing pull tension evenly without distorting the fabric.
Brace Band & Tension Band
Formed steel bands that wrap around round or square fence posts, providing fixed, weld-free anchoring points for top rails, tension bars, and diagonal stays.
Fence Clip (Hog Ring)
Metal fasteners or pre-bent wire clips crimped using specialized pliers to attach fence fabric tightly onto tension wires, line posts, or frame rails.
Gate Hardware
Mechanical components enabling reliable gate operation. Includes heavy-duty strap hinges, adjustable drop bolts, gravity latches, slam locks, and roller wheels.
Site Layout & Concrete Installation Practices
Fence Line Layout
The site prep phase involving boundary line verification, marking corner post centers with string lines, confirming property setbacks, and checking for underground utilities before digging.
Post Spacing
The calculated distance between post centers along a fence line.
- Chain Link Standard:4m to 3.0m
- Rigid Welded Mesh Panels:0m to 2.5m (dictated by factory panel width)
- Wind Load Factors: High-wind or exposed hill areas require closer post spacing and deeper post footings to resist lateral wind forces.
Concrete Footing & Base Preparation
The poured concrete foundation anchoring a fence post into the earth to prevent leaning, movement, or uplift.
- Depth Rule: Post holes should generally be dug to a minimum depth equal to one-third (1/3) of the total post length, or deep enough to reach stable, undisturbed soil.
- Drainage: A 100mm gravel drainage bed beneath the concrete footing prevents water from pooling directly at the base of the post, extending system service life.