Direct Tension Indicators Washers to BS EN 14399-9
Andrews Fasteners company in manufacturing Direct Tension Indicators Washers (DTI Washers) in well know in construction industry company based in United States – TurnaSure. All our washers are marked with our headmark FAST (previously AND.).
Benefits of using Direct Tensions Indicators Washers:
- The use of DTIs is the simplest way of ensuring that bolting assemblies are tensioned properly;
- The use of DTIs saves cost on inspection.;
- No torque figures are required, only feeler gauges;
- Risk reduction on over tightening;
- DTIs are manufactured in compliance with EN 14399-9 and can be supplied with CE approved preload bolting assemblies;
- Unique curved protrusion design of Turnasure DTIs reduce necessary of using nut face / bolt face washers for 8.8 grade assemblies;
- Direct Tension Indicators (DTI) retain their accuracy regardless of their surface condition during tightening, be they oiled, coated or even rusted.
- DTIs can be fully flattened before the bolt yields thanks to their unique geometry, so a flattened DTI can be seen at a distance without the need for a feeler gauge.
- DTIs provide assurance of slip resistance.
Product Range
| Description | Specification | Size range | Availability | |
| Direct Tension Indicators Washers (DTI Washers) | EN 14399 Part 9 Alternative to BS 7644-1, ASTM F959M |
M12 – M36 | ||
Finishes available
| Finish | Specification |
| S/C Self Colour |
Bare / Blackened (Black Oxide) Lightly Oiled |
| HDG Hot Dip Galvanised |
EN ISO 10684 EN 1461 BS 7371 Part 6 |
| SHER / SHERA Sherardized Vapour galvanising |
EN ISO 17668 EN 13811 BS 7371 Part 8 BS 4921 |
| BZP Bright Zinc Plated |
EN ISO 4042 BS 7371 Part 3 |
| MZP Mechanical Applied Coating (Galvanized/Zinc) |
BS 7371 Part 7 |
For technical information and advice on the use of Direct Tension Indicators Washers supplied by Andrews Fasteners please see our Technical Support Page.