Extra Strong Bonded Nylon Thread #138 Tex135 3000yds - Durable Heavy

In this review the reviewer tested the Extra Strong Bonded Nylon Thread #138 Tex135 to see who it suits and why it stands out. Intended for leatherworkers, upholsterers and anyone repairing heavy fabrics, the bottom line is simple: this thread delivers consistent strength and smooth feeding for heavy-duty sewing. Its bonded nylon construction and high-temperature dyeing make it a dependable option when stitch durability and colorfastness matter most.

Key Features

• 100% Nylon 6.6: The high-grade material offers excellent abrasion resistance and reliable tensile strength for demanding seams.
• Bonded and Twisted: Precise twisting and bonding chemistry prevent single-thread untwisting and peeling for cleaner, longer-lasting stitches.
• High-Temperature Lubricant: Treated with a formulated lubricant so the thread passes smoothly through needles and resists heat-related failure.
• Commercial Size #138 Tex135: A 1 lb cone with 3000 yds provides a large, economical supply for frequent or professional projects.
• Fade-Resistant Dyeing: High-temperature dyeing yields uniform color that resists bleeding and fading in finished work.
• Versatile Use: Suitable for leather, upholstery, canvas, footwear, automotive interiors and other heavy textiles where strong seams are required.

Who It's For

The thread is aimed at craftsmen and small shops that routinely sew heavy materials: leatherworkers making wallets or saddles, upholstery technicians repairing sofas and automotive interiors, and makers of heavy canvas goods such as tents and sails. Its commercial cone and 3000 yd length make it practical for repeat projects and production runs.

It is less suitable for delicate hand-sewing or fine garments where a thinner, less visible thread is preferred; hobbyists who only do occasional light mending might find the cone size excessive and could opt for smaller spools instead.

Pros & Cons

Pros

• Exceptional strength and abrasion resistance for long-lasting seams on heavy materials.
• Bonding and lubricant treatment minimize breakage and skipped stitches during machine sewing.
• Large 3000 yd cone is cost-effective for frequent users and professional workrooms.
• Colorfast, high-temperature dyeing keeps finished projects looking consistent over time.

Cons

• Commercial cone size may be bulky for occasional hobbyists or hand sewers.
• The thicker diameter (0.41 mm) limits use to heavy needles and applications, not fine fabrics.

Specifications

Material	100% nylon 6.6
Size	#138 Tex135 Tkt20
Length	3000 yds
Cone weight	1 lb
Diameter	0.41 mm
Average strength	22 lbs
Recommended needle	140/22 or 160/23

Our Verdict

This bonded nylon thread is a practical, value-oriented choice for professionals and serious hobbyists who work with leather, upholstery and heavy canvas. Its bonded construction, lubricant treatment and colorfast dyeing deliver dependable stitching performance, making the 3000 yd cone a sensible investment when durability and consistent results are priorities.

Frequently Asked Questions

Is this thread suitable for sewing leather by machine?
Yes. The bonded nylon construction and recommended needle sizes make it appropriate for machine stitching leather and other heavy materials.

Will the color resist fading or bleeding?
Yes. High-temperature dyeing produces uniform, fade-resistant color designed to minimize bleeding in finished work.

What needle sizes should be used?
Use heavier needles such as 140/22 or 160/23 to accommodate the 0.41 mm diameter and avoid needle damage.