Razor Barbed Wire Specifications Guide: BTO-22 vs CBT-65, Factory-Direct Export Standards

Razor barbed wire—also known internationally as concertina wire or barbed tape—is the first line of defense in high-security perimeter protection worldwide. From military bases and border walls to oil field compounds and correctional facilities, razor wire delivers a psychological and physical deterrent that conventional fencing cannot match.

For procurement managers, security contractors, and government buyers sourcing razor barbed wire from China, understanding the technical specifications is what separates a durable installation from one that rusts through in two monsoon seasons. This guide covers every specification parameter that matters: BTO-22 vs CBT-65 blade profiles, core wire diameters from 2.0mm to 4.0mm, coil diameters from 450mm to 960mm, galvanizing grades, powder coating options, and the ASTM F1910 international standard that governs quality testing.

1. Understanding Razor Barbed Wire: Concertina Coil Basics

Razor barbed wire consists of a high-tensile core wire wrapped with a continuous strip of punched steel tape featuring razor-sharp barbs at precise intervals. When stretched and deployed, it forms a formidable coiled barrier that is extremely difficult to climb, cut, or breach without specialized tools.

The product goes by multiple names in international procurement:

• Concertina wire — military terminology, referring to the expandable coiled configuration
• Barbed tape — emphasis on the flat steel strip from which barbs are punched
• Razor wire — civilian/commercial term, emphasizing the sharp cutting edges
• Spiral razor wire — describes the helical winding pattern

The HS code for international customs classification is 7313.00 (Barbed wire of iron or steel; twisted hoop or single flat wire, barbed or not, and loosely twisted double wire, of a kind used for fencing). This is critical for import duty calculation — razor barbed wire typically attracts 3-7% duty in most markets, though specific rates vary by country and bilateral trade agreements.

2. BTO-22 vs CBT-65: Key Specification Differences

The two dominant razor barbed wire profiles in international trade are BTO (Barbed Tape Obstacle) and CBT (Concertina Barbed Tape). Each is identified by a model number designating the profile series — the distance the sharp blade protrudes from the core wire axis.

Specification	BTO-22	CBT-65
Blade Thickness	0.5 ± 0.05 mm	0.6 ± 0.05 mm
Blade Width	15 ± 1 mm	21 ± 1 mm
Barb Spacing	34 ± 1 mm	100 ± 2 mm
Core Wire Diameter Range	2.0 – 4.0 mm (common: 2.5 mm)	2.0 – 4.0 mm (common: 2.5 mm)
Typical Coil Diameters	450 / 500 / 600 / 700 mm	450 / 500 / 700 / 960 mm
Deterrent Level	Medium-High	Maximum
Primary Applications	Factory perimeters, residential communities, warehouse compounds, commercial security	Military bases, border walls, maximum-security prisons, oil & gas infrastructure, diplomatic compounds
Market Positioning	⭐ Volume seller — best cost-to-security ratio	⭐ Premium grade — maximum deterrence for critical infrastructure

Additional profiles are available as customizable options: BTO-10 (barb length 10mm, for light commercial use), BTO-30 (barb length 30mm, medium-security upgrade), and CBT-60 (barb length 60mm, near-military grade). These variants can be manufactured to order with lead times of 15-25 days depending on volume.

3. Core Wire Diameter Selection: 2.0mm to 4.0mm

The core wire is the structural backbone of every razor wire coil. It is a high-tensile steel wire running through the center of the barbed tape, providing the necessary strength to maintain coil tension, resist cutting attempts, and support the weight of the blade strip during installation and service.

Wire Diameter	Tensile Strength Range	Cut Resistance	Weight Impact	Recommended Use
2.0 mm	350 – 450 MPa	Low	Lightest	Temporary fencing, agricultural deterrent, short-term event security
2.5 mm ⭐	400 – 550 MPa	Medium-High	Balanced	Industrial perimeters, commercial security, warehouse compounds, standard export specification
3.0 mm	500 – 650 MPa	High	Moderate	Oil & gas facilities, mining compounds, coastal installations (with heavy galvanizing)
3.5 – 4.0 mm	550 – 700 MPa	Maximum	Heaviest	Military-grade installations, border infrastructure, maximum-security prisons

2.5mm is the most commonly specified core wire diameter in international trade for three reasons: it provides sufficient structural integrity to maintain coil tension under wind and thermal expansion, it resists manual bolt-cutters for 15-30 seconds (enough delay for security response), and it keeps shipping weight economical — approximately 7-9kg per standard 500mm coil versus 12-15kg for 3.5mm wire.

All core wire diameters are produced from high-carbon or medium-carbon steel wire conforming to mechanical property standards verified through tensile testing per ASTM A370 / ISO 6892 methodology. Buyers should specify the nominal diameter and acceptable tolerance (±0.05mm) in purchase orders to ensure consistent coil geometry during deployment.

4. Coil Diameter & Coverage: From 450mm to 960mm

The coil diameter of razor barbed wire directly determines two critical deployment parameters: barrier height per coil and linear coverage per coil. Selecting the wrong coil diameter results in either inadequate barrier height or excessive material waste — both costly errors in large-scale installations.

Coil Diameter	Typical Loops	Stretch Length	Approx. Weight	Clips Needed	Best Configuration
450 mm	33	7 – 8 m	4 – 5 kg	3	Single coil (top of fence), CBT wall-mount
500 mm ⭐	56	12 – 13 m	7 – 9 kg	3	Single coil — most popular export size
600 mm	56	10 – 11 m	8 – 10 kg	3	Single coil or cross-type, medium-height barrier
700 mm	56	13 – 14 m	10 – 12 kg	3 – 5	Single or cross-type, high-security perimeters
960 mm	56	14 – 16 m	12 – 15 kg	5	Cross-type only, maximum barrier height

How to calculate coverage: A 500mm diameter single coil with 56 loops, when stretched to its operational tension (typically 20-25cm loop spacing), covers approximately 12-13 linear meters. For a 500-meter perimeter, you would need approximately 40-42 coils plus 10% contingency for corners, gates, and termination points.

Weight can be customized per buyer specification. Common weight grades include 5kg, 7kg, 8kg, 9kg, 10kg, and 12kg per coil. Heavier coils use thicker core wire or denser loop counts to increase the physical mass of the barrier. This is particularly relevant for export projects where shipping costs per kilogram must be balanced against the security performance requirements on-site.

5. Surface Treatment & Corrosion Protection

Surface treatment is the single most important factor determining the service life of razor barbed wire. A correctly specified galvanizing grade can mean the difference between 5 years and 25+ years of effective security without degradation. The following grades represent the full range available for international procurement:

Treatment	Zinc Coating / Thickness	Test Standard	Service Life (Approx.)	Best For
Standard Hot-Dip Galvanized	60 – 80 g/m²	ASTM A90/A90M	5 – 8 years	Inland environments, low humidity, temporary installations, budget-sensitive projects
Medium Hot-Dip Galvanized	≥ 120 g/m²	ASTM A90/A90M	10 – 15 years	Moderate rainfall areas, urban environments, commercial security
High-Zinc Hot-Dip Galvanized ⭐	≥ 245 g/m²	ASTM A90/A90M, ISO 1461 Class 3	20 – 25+ years	Coastal installations, high humidity, tropical monsoon, critical infrastructure
Powder Coating / PVC Coated	0.3 – 0.5 mm coating thickness (over galvanized base)	Visual inspection + adhesion test	15 – 20 years	Aesthetic requirements, color-coded security zones, additional corrosion barrier
201 Stainless Steel	N/A (inherent corrosion resistance)	Chemical composition analysis	20+ years	Specialized applications — available as custom order

Powder coating color options include dark green (military standard), black (maximum visual deterrence), yellow (high-visibility warning), and white (diplomatic/corporate campus aesthetics). The powder coating is applied over a galvanized base layer, providing dual-layer protection against both corrosion and UV degradation.

6. Single Coil vs Cross-Type: Which Configuration?

Razor barbed wire is supplied in two fundamental coil configurations, each designed for a different deployment geometry and security level:

Feature	Single Coil (Single Spiral)	Cross-Type (Double Spiral)
Construction	One continuous spiral of razor tape wound around a single core wire axis	Two intersecting spirals crossing each other, creating a diamond-pattern barrier
Barrier Density	Moderate — gaps between loops when stretched	Very high — intersecting blades fill all gaps
Typical Coil Diameters	450 / 500 / 600 / 700 mm	600 / 700 / 960 mm
Installation Speed	Fast — one-man deployment with minimal clipping	Slower — requires precise alignment and more clipping points
Bypass Difficulty	High — 30-45 seconds to cut through with heavy bolt cutters	Extreme — 90+ seconds to create a breach, multiple cutting points required
Weight (500mm / 56-loop equivalent)	7 – 9 kg	14 – 18 kg (double the material)
Cost Factor	1.0× (baseline)	~1.8 – 2.0× (double material + complex manufacturing)
Recommended Use	General perimeter security, fence-top augmentation, industrial compounds	Ground-level barriers, military perimeter rings, standalone security cordons

For most international procurement, single coil configuration accounts for roughly 70-80% of orders due to its better cost-to-coverage ratio. Cross-type is typically specified only for the innermost security ring of high-value installations, or for deployments where the razor wire serves as the primary barrier rather than a fence-top augmentation.

7. International Standards & Quality Testing

Razor barbed wire exported internationally must conform to recognized standards for dimensional accuracy, mechanical strength, and coating integrity. The three-tier testing framework below represents best practice for factory quality assurance:

Standard	Scope	Key Test Parameters
ASTM F1910-98 (2018)	Standard Specification for Long Barbed Tape Obstacles	Barb length tolerance (±1mm), barb width tolerance (±1mm), barb spacing tolerance, coil diameter verification, material thickness, minimum tensile properties
ISO 1461	Hot-dip galvanized coatings on fabricated iron and steel articles	Minimum coating mass (245 g/m² for Class 3), coating uniformity, adhesion (no flaking on bending), appearance (smooth, free from bare spots)
ASTM A90/A90M	Standard Test Method for Weight of Coating on Zinc-Coated (Galvanized) Iron or Steel Articles	Gravimetric zinc coating weight measurement, triple-spot testing for uniformity, adherence evaluation
ASTM A370 / ISO 6892	Mechanical testing of steel products / Tensile testing at ambient temperature	Core wire tensile strength (MPa), yield strength, elongation percentage
ASTM B117 / ISO 9227	Salt spray (fog) testing for corrosion resistance	Neutral salt spray exposure duration before red rust appears on galvanized coating (available on request for high-spec projects)

Factory quality control checklist (per production batch):

1. Dimensional inspection — Vernier caliper measurement of blade length, blade width, blade spacing, and coil diameter on 3 random samples per 100 coils
2. Core wire diameter — Micrometer measurement (±0.01mm resolution), 5-point check per coil sample
3. Blade thickness — Micrometer measurement at blade tip and base, 0.5±0.05mm for BTO, 0.6±0.05mm for CBT
4. Zinc coating weight — Gravimetric method per ASTM A90/A90M, dissolution in inhibited acid, triple-spot average
5. Visual inspection — 100% visual check for blade sharpness (no burrs, no blunt edges), coating uniformity (no bare spots, no zinc lumps), and coil integrity
6. Tensile test — Core wire sample tested to failure, recording ultimate tensile strength per ISO 6892
7. Salt spray test — Per ASTM B117, available on buyer request for projects requiring documented corrosion resistance data

8. Application Scenarios: Military, Prison, Oil Field, Perimeter

Different security environments demand different razor wire specifications. Below is the application-to-specification mapping that guides procurement decisions in international projects:

Application	Recommended Profile	Coil Diameter	Wire Ø	Galvanizing	Configuration
Military Base Perimeter	CBT-65	700 / 960 mm	3.0 mm	≥245 g/m²	Cross-type
Maximum-Security Prison	CBT-65 / BTO-30	700 mm	2.5 – 3.0 mm	≥245 g/m²	Cross-type
Oil & Gas Facility	BTO-22 / CBT-60	500 / 700 mm	2.5 – 3.0 mm	≥245 g/m² (coastal) or ≥120 g/m² (inland)	Single coil (fence-top) or cross-type (ground-level)
Border Infrastructure	CBT-65	960 mm	3.5 – 4.0 mm	≥245 g/m²	Cross-type, multiple stacked rings
Industrial Compound	BTO-22 ⭐	500 mm	2.5 mm	≥120 g/m²	Single coil (fence-top)
Residential Community / Villa	BTO-22	450 / 500 mm	2.0 – 2.5 mm	60 – 80 g/m² or powder coated	Single coil
Warehouse / Logistics Center	BTO-22	500 mm	2.5 mm	60 – 80 g/m²	Single coil (fence-top)
Agricultural / Ranch Perimeter	BTO-10 (custom)	450 mm	2.0 mm	60 – 80 g/m²	Single coil

9. Packaging, Container Loading & Export Logistics

Proper packaging of razor barbed wire for ocean freight is critical — loose or inadequately secured coils can cause container damage, worker injury during unloading, and significant claims from shipping lines. Standard export packaging follows these specifications:

Packaging Parameter	Standard Specification
Coil Bundling	50 coils compressed and strapped per bundle with steel banding strips (3 horizontal + 2 vertical straps). Each bundle wrapped in waterproof plastic film then heavy-duty woven polypropylene bag.
Loose Packing (Alternative)	Individual coils packed in woven bags, stacked on pallets. Suitable for small-quantity orders or mixed-container shipments.
Palletization	Heat-treated wooden pallets (ISPM 15 certified for international shipping), maximum 1,200 kg per pallet. Pallets wrapped with stretch film and edge-protected with cardboard corner guards.
20ft Container Capacity	Approximately 18 – 22 metric tons, or 1,800 – 3,000 standard 500mm single coils depending on weight specification
40ft Container Capacity	Approximately 25 – 28 metric tons, or 2,500 – 4,000 standard 500mm single coils depending on weight specification
Labeling	Each bundle/pallet labeled with: Product name, specification (BTO/CBT, wire Ø, coil Ø), zinc coating grade, coil count, net weight, gross weight, batch number, production date, FOB port (Tianjin, China), destination port

FOB Port: All shipments depart from Tianjin Port, the largest northern China deep-water port with direct container shipping lines to the Middle East (Jebel Ali, Dammam, Umm Qasr), Africa (Mombasa, Durban, Lagos), South Asia (Karachi, Chittagong, Mumbai), and Latin America (Santos, Callao). Typical ocean transit times: 15-20 days to Middle East, 25-30 days to East Africa, 30-35 days to West Africa, 35-45 days to South America.

10. How to Specify Your Razor Wire Order

To receive an accurate FOB Tianjin quotation, your RFQ should include every parameter in the checklist below. An incomplete specification leads to assumptions that may not align with project requirements: