Part 1: Application Scenarios and Core Advantages
Application Positioning for Tex 135 Bonded Nylon Thread
Tex 135 (#138) bonded nylon thread is a relatively large sewing thread commonly considered for applications that require a substantial stitch profile. Depending on the material, seam design and sewing setup, it may be suitable for leather footwear, bags, luggage, upholstery, knife sheaths and other medium-to-heavy sewn products.
Compared with smaller thread sizes such as Tex 90, Tex 135 provides a larger thread profile and more visible stitch appearance. It can be considered where the material and sewing equipment can accommodate the thread size and where a heavier stitch is preferred. Final selection should still be based on the actual material, stitch requirement, machine capability and intended use rather than on thread size alone.
Machine Setup and Technical Considerations
Moving to a larger thread such as Tex 135 (420D/3) may require adjustments to the sewing setup. Thread size can affect needle selection, tension, hook clearance and stitch formation, so compatibility should be reviewed against the specific machine, material and application before production use. The actual thread diameter of 0.414 mm for V138 thread significantly alters needle thread tension dynamics and rotary hook clearance.
NEXUS can support customers with thread selection, needle guidance and application-related questions based on the information provided. Machine-specific settings such as tension, timing and feeding should also be checked against the actual sewing machine, material and manufacturer guidance.
- Thread and Needle Selection: Review Tex size and needle guidance according to the material and sewing requirement.
- Machine Compatibility: Consider hook clearance, feeding system and the machine’s supported thread range.
- Tension and Stitch Formation: Use the machine manufacturer’s guidance and actual sewing tests to refine tension and stitch formation.
- Application Review: Evaluate the desired stitch appearance, material thickness and finished-product requirement before final thread selection.
Color Verification and Order Fulfillment
Before shipment, NEXUS can provide photos of the actual prepared products for customer review. This helps confirm the prepared product and color, but it should not be treated as a 100% color-match guarantee because photography, lighting and screen settings can affect perceived color.
Custom colors are also supported where applicable. Customers can provide a physical sample, image reference or Pantone reference. International shipping times vary by destination, shipment weight, selected service and carrier, so any transit time provided for a specific order should be treated as an estimate rather than a universal delivery guarantee.
For confirmed custom-color orders, the current MOQ is 10 units with an additional USD 50 custom-color fee. Standard custom-color lead time is 10 days, and urgent custom orders may be ready for dispatch on the third day after order confirmation. Customized products are non-returnable.
Part 2: Internal Test Data and Product Reference Specifications
NEXUS maintains internal tensile test data for Tex 135 (#138) Bonded Nylon 6.6 Thread. The values in this section reflect the tested sample and the stated test conditions. They are provided as product reference data and should not be interpreted as independent laboratory certification, ASTM compliance, or a permanent performance guarantee for every production batch, seam or finished product.
Tex 135 (#138) Internal Test and Product Reference Data
| Technical Parameter | Internal Test / Product Reference Data |
|---|---|
| Material Composition | Polyamide 6.6 Continuous Filament |
| Thread Construction | 420D/3 (3 plies) |
| Physical Diameter | Only retain if confirmed by current product records |
| Internal Test Speed / Gauge Length | 250 mm/min / 400 mm |
| Recorded Test Environment | 25°C / 60% RH |
| Mean Breaking Strength — Tested Sample | 10,869.60 cN |
| Tensile Tenacity | 8.63 g/D |
| Mean Elongation at Break | 32.27% |
| Twist | Confirm current TPM value before publishing |
| Suggested Needle Range | Nm 125/20 to Nm 140/22 |
| Breaking Strength C.V. | 1.21% |
Part 3: Application and Use Considerations
Because Tex 135 is a relatively large thread size, application and machine compatibility should be reviewed carefully before use. Material thickness, seam design, needle size, machine clearance, feeding system and stitch requirements can all affect sewing performance.:
Typical Application Areas
- Leather Goods and Footwear
- Typical applications may include leather footwear, boots, knife sheaths, saddlery components, thick leather belts, tool bags and substantial luggage.
- Tex 135 provides a larger thread profile than Tex 90 and may be suitable where a more substantial stitch is desired. Actual sewing performance depends on the leather, seam design, needle, machine setup and operating conditions.
- Upholstery and Decorative Topstitching
- Tex 135 may be considered for upholstery, leather furniture and decorative topstitching where a larger and more visible stitch profile is preferred. Final selection should be based on the material thickness, seam construction and sewing equipment.
- The bonded construction helps keep the plied strands together and reduce strand separation during sewing. Stitch appearance still depends on the thread, material, stitch length and machine setup.
- Handbags and Luggage
- Tex 135 may be used for decorative edge stitching, multi-layer leather construction and visible topstitching on bags and luggage when the material and sewing equipment can accommodate the thread size.
- The larger thread size can create a more visible stitch appearance. Sewing stability depends on the material transition, needle size, thread tension, feeding system and machine setup, so testing with the actual material is recommended before production use.
- THeavy Canvas and Substantial Sewn Products
- Tex 135 may also be considered for selected heavy canvas, covers, tool bags, dog collars and other substantial sewn products where the thread size, material and sewing equipment are compatible.
- For outdoor applications, fiber material and expected UV exposure should be evaluated separately rather than assuming that Tex size alone determines environmental durability.
Material and Thread Size Selection Considerations
- ❌Lightweight Materials: Tex 135 may be too large for some lightweight leather, wallets or fine upholstery materials. The larger thread and corresponding needle size can create a more pronounced stitch and larger needle holes. Suitability should be evaluated according to the material, seam design, desired stitch appearance and machine setup rather than by a fixed material-weight threshold alone.
- 💡 Smaller Thread Options: For lighter or medium-weight materials, a smaller thread such as Tex 90 may be more appropriate depending on the application and desired stitch appearance. Final selection should be based on the actual material and sewing requirement rather than treated as a mandatory downgrade.
- 💡 Larger Thread Options: If the project requires a larger stitch profile or heavier thread size, Tex 210 (#207) may be considered where the material and sewing equipment can accommodate it.
Machine Compatibility and Setup Considerations
- Household and Light-Duty Machines: Many household or light-duty sewing machines may not be designed for Tex 135. Compatibility depends on hook clearance, needle capacity, feeding system, presser-foot lift and the machine manufacturer’s supported thread range.
- Industrial Machine Setup: Industrial compound-feed or walking-foot machines may be suitable for Tex 135 where the machine provides adequate clearance, needle capacity and feeding capability. A machine such as a 1341 compound-feed cylinder-bed model may be considered for some leather and heavy-material applications, but compatibility should be confirmed for the specific machine, material and stitch requirement.
Just how strong is V138 (Tex 135) sewing thread?
NEXUS maintains internal tensile test records for Tex 135 (#138) Bonded Nylon 6.6 Thread. The values below reflect the tested sample and the stated test conditions. They are provided as product reference data and should not be interpreted as independent laboratory certification, a permanent specification for every production batch, or a finished-product performance guarantee:
Internal Tensile Test Results
- Commercial-grade breaking strength: Commercial reference value: 22 lbs / 10 kg, if confirmed by current product records.
- Mean breaking strength — tested sample: 10,869.60 cN
- Maximum breaking strength — tested sample: 11,031.77 cN
- Tensile tenacity — tested sample: 8.63 g/D, demonstrating exceptionally high monofilament purity.
Mean Elongation at Break — Tested Sample
The tested sample recorded a mean elongation at break of 32.27% under the stated tensile-test conditions. This value describes elongation behavior in that specific test and should not be interpreted as a certified dynamic-impact, energy-absorption or safety-performance rating.
- Bonded Construction: The bonding treatment helps keep the plied strands together and reduce strand separation during sewing. Actual sewing behavior depends on the thread specification, material, needle, machine setup and operating conditions.
What Needle Size Should Be Considered for Tex 135 Thread?
NEXUS product guidance lists industrial needle sizes 125/20 to 140/22 as a reference range for Tex 135 (#138) thread. Final needle selection should be confirmed against the specific sewing machine, material, stitch requirement and needle system.
A needle with sufficient eye and groove clearance can help reduce friction and support smoother thread feeding during sewing.
- Friction and Thread Feeding: An undersized needle can increase friction at the needle eye and interfere with thread movement.
- Tension and Stitch Formation: Poor needle-to-thread compatibility may contribute to inconsistent tension, skipped stitches or thread damage.
- Heat During Sewing: High sewing speed, friction, tension and material resistance can increase heat at the needle and thread interface. Actual behavior depends on the complete sewing setup.
Instantaneous High-Temperature Melting: During high-speed continuous production, extreme tension generates significant frictional heat. Because a small needle cannot dissipate heat effectively, the high temperature at the needle eye melts the nylon thread, causing frequent production line stoppages.
Can my home sewing machine use V138 (Tex 135) thread?
Many household sewing machines are not designed to handle a thread as large as Tex 135 (#138), but compatibility varies by machine model. Hook clearance, needle capacity, bobbin size, feeding system, presser-foot lift and the manufacturer’s supported thread range should all be checked before use.
If the machine does not provide sufficient clearance for the thread and needle combination, sewing problems such as binding, inconsistent tension, skipped stitches, needle deflection or thread damage may occur. For this reason, Tex 135 is generally better evaluated on industrial or heavy-duty machines that are designed to accommodate larger thread sizes.
Machine compatibility should be confirmed using the actual machine, material and stitch configuration rather than assuming that every household machine will fail or that every industrial machine will be suitable.
- Hook and Thread Clearance: Confirm that the machine provides enough clearance for the thread to pass through the hook and bobbin system without excessive binding.
- Needle Capacity: Check whether the machine can accept a needle size appropriate for Tex 135.
- Feeding and Material Control: Heavier thread is often used with thicker materials, so the machine’s feeding system and presser-foot capability should also be considered.
What is the fundamental difference between Tex 90 and Tex 135 threads?
Tex 90 and Tex 135 differ mainly in thread size, stitch appearance and the sewing setup they typically require. Tex 135 is larger than Tex 90, so changing between the two may require adjustments to needle size, thread tension and machine setup depending on the material and sewing application.
Tex 90 (#92) — Medium Thread Profile
Thread Construction: 280D/3
Suggested Needle Range: Nm 110/18 to Nm 125/20
Typical Use: Leather goods, bags, footwear, upholstery and selected canvas applications where a medium thread profile is appropriate.
Test Evidence: Internal tensile test data is available for the tested Tex 90 Bonded Nylon 6.6 sample under the recorded conditions.
Tex 135 (#138) — Larger Thread Profile
Thread Construction: 420D/3
Suggested Needle Range: Nm 125/20 to Nm 140/22
Typical Use: Leather footwear, luggage, upholstery, bags, saddlery components and other applications where a more substantial stitch profile is desired.
Test Evidence: Internal tensile test data is available for the tested Tex 135 Bonded Nylon 6.6 sample under the recorded conditions.
Choose between Tex 90 and Tex 135 according to the material, desired stitch appearance, seam construction and machine capability rather than treating one size as universally better than the other.
