Sewing thread and zip recommendations for safety shoes
Coats is proud to offer a comprehensive range of high performance threads and zips for manufacturing all types of safety shoes. Coats threads and zips are specifically engineered to enhance sewing performance and to improve the durability of the finished product.
Coats threads & zips
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Below are recommended stitch types for this end use item.
Coats industrial sewing threads are available in a range of fibre types and finishes, each designed to meet particular customer needs. Please see this comprehensive range below.
Key: CE = Closed End; OE = Open End; 2WOE = 2 Way Open End; 2WCE = 2 Way Closed End; X-Form / O-Form
|Opti M||Opti RT||Opti S|
|Opening||M80 CE||-||RT10 CE||Reversed, Zero-cut toptape ends||S80 CE||HydroS, FlameGuard|
|M60 CE||-||RT10 CC||Reversed||S60 CE||Reversed, Reflective, Contrast, Zero-cut toptape ends, Stitch line, Boot curved, Pin bottom stop, Hot melt adhesive, Bi-adhesive, HydroF, FlameGuard|
|-||-||-||-||S60 CC||Reversed, Reflective, Contrast, HydroF, FlameGuard, Hot melt adhesive, Bi-adhesive|
- When attaching the zip, we recommend a minimum gap of 2 mm between the spiral edge and edge of the leather, to ensure the slider runs correctly. This is as per the SATRA recommendation.
- Excessive glue should be removed. Caution should be taken to ensure the glue pots and dispensers are positioned away from the teeth and slider.
- During the soiling out process, the side pushes can be an issue if they press against the slider.
- Attention must be taken with the thickness, width and positioning of the zip guards.
- When the zip goes through the curing tunnel, the slider should be pulled to the top of the boots, and the boots should be laid down with the slider facing upwards.
- Coats have a comprehensive range of flame retardant (FR) zips available: Opti FireFly, Opti FlameMaster, Opti FlameGuard; please contact Coats for more details.
Sewing recommendation for Opti S zips – Whilst sewing, the presser foot can accidently go over the spiral and stitch line and as a consequence this can affect the slider running.
Sewing recommendations for Opti M zips - When applying the zip to the bottom edge, the sewing line needs to be just below the bottom stop. Care must be taken to keep a straight sewing line, because there is a risk of needle breakage if it comes into contact with the teeth.
Since conditions and applications vary considerably in the use of the thread, Coats and its distributors can make no guarantee of results. These recommendations are given in good faith but without warranty or liability on the company or its employees. The thread user should assure herself or himself by preliminarily testing that the thread is suitable for the end use intended. Technical information listed above is based on current averages and should be taken only as indicative.