33 x 20.8 Armour Ring™ - Stainless Steel (A2)


Key Features

  • High Security Level (4)
  • Home Office Approved
  • 1 Year Extended Warranty.
  • Free Technical Support From Our Engineers.
  • External Diameter (D): 33mm
View Full Technical Specification.
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Official Hafren Security Fasteners Product.
$12.38 / each.
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33 x 20.8 Armour Ring™ - Stainless Steel (A2) Technical Specification

33 x 20.8 Armour Ring™ - Stainless Steel (A2) Drawing
External Diameter (D)33mm
Fastening Type1 Way Permanent Fixing
Height (H)13.5mm
Internal Diameter (d)20.8mm
MaterialStainless Steel (A2)
Material SpecificationStainless Steel (A2)
Security LevelHigh Security Level (4)

Product Certifications

Certificate of Conformity Included
Certificate of Conformity Included
RoHS Certified
RoHS Certified
REACH Certified
REACH Certified
Quality Approved

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33 x 20.8 Armour Ring™ - Stainless Steel (A2) Description

The 33 x 20.8 Armour Ring™ - Stainless Steel (A2) has the following features:

  • 13.5mm Height (H)
  • Stainless Steel (A2) Material
  • Stainless Steel (A2) Material Specification
  • Natural Finish
  • 33mm External Diameter (D)
  • 20.8mm Internal Diameter (d)
  • 1 Way Permanent Fixing Fastening Type
  • High Security Level (4) Security Level

Discover more about the Armour Rings™ range.

Armour Rings are a simple and unique conical collar which convert standard Hex Bolts and Hex Nuts into tamper resistant fasteners. As the Armour Ring™ can simply be installed onto any British or DIN standard hexagon nut or bolt using a regular hammer, it requires no specialist tooling to operate.

The patented Armour Ring is intended to be an easy to use 1-Way security fastener. They aren’t governed by torque and are designed to be used for maintenance free applications, giving them some advantage over other similar permanent fixings.

Favoured by Health & Safety executives, along with approval from the Home Office, Armour Rings provide a smooth, clean finish which is free from sharp edges and similar in appearance to a Conical Washer. Common applications for this type of tamper resistant fastener cover are security grilles and for securing public installations such as park benches.


Security Armour Rings are available from Accu in both Stainless Steel and Bright Zinc Plated Steel. Stainless Steel Armour Rings can be supplied with a Matte Black finish.


Security Armour Rings can be used to convert Hexagon Bolts or Nuts into tamperproof fixtures, compatible with metric sizes M6 to M20.

Shipping Information

Shipping Destinations:Worldwide.
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Weight: Not defined.

Component History

Product First Available:Monday, September 6, 2021
Stock Last Updated:08:13 am
Thursday, January 20, 2022
Specification Last Updated:Thursday, January 20, 2022

APC / Barcodes

APC (Accu Product Code):HAR-33-20.8-S
EAN13 (International Article No.):5054328282452
ASIN (Amazon Stock Identification No.):ASIN not defined.