High tenacity filament polyester sewing thread, filament nylon 66 sewing thread, also bonded nylon thread, have lots of thicknesses from fine Denier to coarse Denier. Different thickness specifications directly correspond to different application scenarios and strength requirements.

(Please read the thread specifications with TAYYON complete Thread Size Comparison:)

1. Ultra-Fine Specifications (Tex 8 - Tex 21)‌

Common Designations: T8, T16, T21

Application Fields: Lightweight fabrics, high-density fabrics

Specific Applications:

● High-end shirts: Sewing collars, plackets, cuffs, and other areas requiring fine stitches.

● Underwear, sleepwear: Used for elastic or silk fabrics, requiring thin, soft threads that are not irritating to the skin.

● Windbreakers, lightweight down jackets: Using T21 or finer high-tenacity thread with fine needles ensures seam strength while minimizing needle holes, effectively preventing down leakage and water seepage.

● High-end garments like silk and cashmere.

2. Medium Specifications (Tex 30 - Tex 60)‌

Common Designations: T35, T45

Application Fields: Quilting, general apparel, bags, shoes, and hats

Specific Applications:

● Bedding: Used for quilting mattresses, box springs, pillows, and cushions. This is the most widely used specification range.

● General woven garments: Such as jeans, jackets, suits, work pants for seam joining and quilting.

● Bags: Internal stitching and accessory attachment for backpacks, handbags, and wallets.

● Sports shoes, casual shoes: Upper seam joining and some decorative stitching.

● Furniture covers: Sewing sofa covers, chair covers.

3. Medium-Coarse Specifications (Tex 70 - Tex 150)‌

Common Designations: T70, T90, T135

Application Fields: Heavy-duty products, outdoor equipment, special workwear

Specific Applications:

● Heavy denim garments: Such as stitching for heavyweight denim.

● Work gloves: Requiring extremely high abrasion resistance.

● Tents, sleeping bags: Withstanding high tension and harsh outdoor environments.

● Canvas products: Such as messenger bags, tool bags.

● Car seats, airbags: Requiring extremely high strength and reliability.

● Heavy leather products.

4. Ultra-Coarse Specifications (Tex 200 and above)‌

Common Designations: T210, T275, T350, T400

Application Fields: Heavy-duty industrial, special purposes                                                              

Specific Applications:

● Leather shoes, boots: Stitching the upper to the sole.

● Harnesses, saddlery.

● Conveyor belts: Joining and repairing industrial conveyor belts.

● Sailcloth, cables.

● Lifting slings, safety belts: Serving as the core stitching for load-bearing parts.

The selection of thread specification is primarily based on balancing the following factors:

- Fabric Thickness and Material:‌ Thin fabrics paired with fine threads, thick fabrics with coarse threads. This is the fundamental principle.

- Strength Requirements of the Seam Area:‌ Areas subject to high stress (e.g., crotch, shoulder seams) require thicker or higher-strength thread.

- Stitch Appearance Requirements:‌ Use fine threads for invisible stitches (e.g., shirts); use coarse threads for decorative topstitching (e.g., jeans).

- Needle and Throat Plate:‌ The thread specification must be compatible with the needle size and the sewing machine throat plate hole size; otherwise, it may lead to thread breakage, skipped stitches, or fabric damage.

 Sewing Thread Thickness    Different Aplications    Bonded Nylon Thread     Filament Polyester Sewing Thread