The 21x25 Gauge 031021C Copper Flat Box Stitching Wire from KYA Fasteners is designed for stitching cardboard packaging boxes, cartons, and books. With dimensions of 0.031" x 0.021" (0.80mm x 0.55mm), this low carbon steel wire features a copper coating for enhanced corrosion resistance and a bright, flake-free finish. Offering a tensile strength of 135,000-165,000 PSI, it ensures strong, reliable stitches without premature wear on stitching heads or trimmer knives. Ideal for side, saddle, and corner stitching, this wire flows smoothly off the spool, minimizing kinks and downtime for high-speed packaging operations.
21x25 gauge (0.80mm x 0.55mm) copper-coated flat wire
Tensile strength of 135,000-165,000 PSI for reliable stitches
Corrosion-resistant copper finish with no flaking
Smooth flow from spool, free of kinks and bends
Ideal for stitching cardboard boxes, cartons, and books
559 feet per pound for efficient high-volume use
| Specification | Details |
|---|---|
| Model | 031021C |
| Gauge | 21x25 |
| Wire Dimensions | 0.031" x 0.021" (0.80mm x 0.55mm) |
| Material | Low Carbon Steel |
| Finish | Copper Coated (Galvanized also available) |
| Tensile Strength | 135,000-165,000 PSI |
| Tolerance | +/- 0.05mm |
| Feet per Pound | 559 |
| Recommended Work Thickness | 1/16" - 1/2" |
| Wire Gauge | Size (in.) | Size (mm) | Feet per Pound | Recommended Work Thickness |
|---|---|---|---|---|
| 18 x 20 | 0.047 x 0.035 | 1.20 x 0.90 | 221 | 5/8" - 2" |
| 19 x 21.5 | 0.041 x 0.030 | 1.05 x 0.75 | 283 | 1/2" - 1" |
| 19.5 x 21 | 0.037 x 0.031 | 0.95 x 0.80 | 283 | 1/2" - 1" |
| 20 x 24 | 0.035 x 0.023 | 0.90 x 0.60 | 408 | Up to 3/16" |
| 20 x 25 | 0.035 x 0.021 | 0.90 x 0.55 | 455 | 1/8" - 5/8" |
| 21 x 25 | 0.031 x 0.021 | 0.80 x 0.55 | 559 | 1/16" - 1/2" |
| Wire Gauge | German Wire Gauge (mm) | m/kg | ASWG (mm) | m/kg | ft/LBS | BWG (mm) | m/kg | ft/LBS |
|---|---|---|---|---|---|---|---|---|
| 21 | 0.8 | 253 | 0.81 | 247 | 368 | 0.81 | 247 | 368 |
| 22 | 0.75 | 288 | 0.73 | 304 | 452 | 0.71 | 322 | 479 |
| 23 | 0.65 | 331 | 0.65 | 384 | 571 | 0.63 | 409 | 609 |
| 24 | 0.6 | 451 | 0.58 | 482 | 717 | 0.56 | 517 | 769 |
| 25 | 0.55 | 536 | 0.52 | 600 | 893 | 0.51 | 624 | 929 |
| 26 | 0.5 | 649 | 0.46 | 767 | 1141 | 0.46 | 767 | 1141 |
| 27 | 0.45 | 801 | 0.44 | 838 | 1247 | 0.41 | 965 | 1436 |
| 28 | 0.4 | 1014 | 0.41 | 965 | 1436 | 0.36 | 1252 | 1863 |
| 29 | 0.37 | 1185 | 0.38 | 1123 | 1671 | 0.33 | 1489 | 2216 |
| 30 | 0.35 | 1324 | 0.36 | 1252 | 1863 | 0.3 | 1802 | 2682 |
The 031021C Copper Flat Box Stitching Wire is optimized for durable packaging applications. Contact KYA Fasteners for bulk orders or custom specifications.
Request a Bulk QuoteCopper-coated for corrosion resistance and bright finish
High-quality steel with clean, flake-free surface
No kinks or bends for smooth de-spooling
Tensile strength optimized at 135,000-165,000 PSI
Ideal for side, saddle, and corner stitching
Recommended for packaging furniture, mattresses, and machine parts
The 031021C Copper Flat Box Stitching Wire is designed for packaging applications requiring strong, reliable stitches.
Stitching cardboard packaging boxes
Carton assembly
Booklet and book binding
Packaging furniture and mattresses
Securing machine parts in corrugated cartons
Wire tensile strength, measured in PSI, determines the force required to break the wire. The 031021C Stitching Wire has an optimal tensile range of 135,000-165,000 PSI, ensuring strong stitches without excessive stiffness. Higher tensile strengths (>165,000 PSI) can prematurely wear stitching heads and trimmer knives, increasing maintenance costs. Lower tensile strengths (<135,000 PSI) may result in soft wire that fails to form proper stitches.
It is used for stitching cardboard boxes, cartons, books, and packaging for furniture, mattresses, and machine parts.
The copper coating provides corrosion resistance and a bright, flake-free finish for aesthetic and durable stitches.
The wire has a tensile strength of 135,000-165,000 PSI, balancing strength and machine compatibility.
It is recommended for materials from 1/16" to 1/2" thick.
Its smooth, kink-free design ensures reliable de-spooling and consistent stitching in high-speed machines.
It is compatible with box stitching machines for side, saddle, and corner stitching; contact KYA Fasteners for specific recommendations.
Ask a QuestionWith over 20 years of expertise, KYA Fasteners is a trusted leader in industrial fasteners, delivering high-quality 21x25 Gauge 031021C Copper Flat Box Stitching Wire. Our SGS-certified production ensures precision and durability, serving clients in over 50 countries. We ship from Qingdao port within 20-30 days, offering customized solutions for packaging and stitching needs.
Global Reach: Exporting to 50+ countries with reliable stitching wire
Premium Quality: Corrosion-resistant, high-performance wire for packaging
Fast Delivery: Ships worldwide in 20-30 days from Qingdao port
Custom Solutions: Tailored wire gauges and finishes for specific applications
Enhance your packaging operations with 031021C Stitching Wire. Request a free quote today to experience KYA's quality and service.
Contact KYA Fasteners
The 21x25 Gauge 031021C Copper Flat Box Stitching Wire from KYA Fasteners is designed for stitching cardboard packaging boxes, cartons, and books. With dimensions of 0.031" x 0.021" (0.80mm x 0.55mm), this low carbon steel wire features a copper coating for enhanced corrosion resistance and a bright, flake-free finish. Offering a tensile strength of 135,000-165,000 PSI, it ensures strong, reliable stitches without premature wear on stitching heads or trimmer knives. Ideal for side, saddle, and corner stitching, this wire flows smoothly off the spool, minimizing kinks and downtime for high-speed packaging operations.
21x25 gauge (0.80mm x 0.55mm) copper-coated flat wire
Tensile strength of 135,000-165,000 PSI for reliable stitches
Corrosion-resistant copper finish with no flaking
Smooth flow from spool, free of kinks and bends
Ideal for stitching cardboard boxes, cartons, and books
559 feet per pound for efficient high-volume use
| Specification | Details |
|---|---|
| Model | 031021C |
| Gauge | 21x25 |
| Wire Dimensions | 0.031" x 0.021" (0.80mm x 0.55mm) |
| Material | Low Carbon Steel |
| Finish | Copper Coated (Galvanized also available) |
| Tensile Strength | 135,000-165,000 PSI |
| Tolerance | +/- 0.05mm |
| Feet per Pound | 559 |
| Recommended Work Thickness | 1/16" - 1/2" |
| Wire Gauge | Size (in.) | Size (mm) | Feet per Pound | Recommended Work Thickness |
|---|---|---|---|---|
| 18 x 20 | 0.047 x 0.035 | 1.20 x 0.90 | 221 | 5/8" - 2" |
| 19 x 21.5 | 0.041 x 0.030 | 1.05 x 0.75 | 283 | 1/2" - 1" |
| 19.5 x 21 | 0.037 x 0.031 | 0.95 x 0.80 | 283 | 1/2" - 1" |
| 20 x 24 | 0.035 x 0.023 | 0.90 x 0.60 | 408 | Up to 3/16" |
| 20 x 25 | 0.035 x 0.021 | 0.90 x 0.55 | 455 | 1/8" - 5/8" |
| 21 x 25 | 0.031 x 0.021 | 0.80 x 0.55 | 559 | 1/16" - 1/2" |
| Wire Gauge | German Wire Gauge (mm) | m/kg | ASWG (mm) | m/kg | ft/LBS | BWG (mm) | m/kg | ft/LBS |
|---|---|---|---|---|---|---|---|---|
| 21 | 0.8 | 253 | 0.81 | 247 | 368 | 0.81 | 247 | 368 |
| 22 | 0.75 | 288 | 0.73 | 304 | 452 | 0.71 | 322 | 479 |
| 23 | 0.65 | 331 | 0.65 | 384 | 571 | 0.63 | 409 | 609 |
| 24 | 0.6 | 451 | 0.58 | 482 | 717 | 0.56 | 517 | 769 |
| 25 | 0.55 | 536 | 0.52 | 600 | 893 | 0.51 | 624 | 929 |
| 26 | 0.5 | 649 | 0.46 | 767 | 1141 | 0.46 | 767 | 1141 |
| 27 | 0.45 | 801 | 0.44 | 838 | 1247 | 0.41 | 965 | 1436 |
| 28 | 0.4 | 1014 | 0.41 | 965 | 1436 | 0.36 | 1252 | 1863 |
| 29 | 0.37 | 1185 | 0.38 | 1123 | 1671 | 0.33 | 1489 | 2216 |
| 30 | 0.35 | 1324 | 0.36 | 1252 | 1863 | 0.3 | 1802 | 2682 |
The 031021C Copper Flat Box Stitching Wire is optimized for durable packaging applications. Contact KYA Fasteners for bulk orders or custom specifications.
Request a Bulk QuoteCopper-coated for corrosion resistance and bright finish
High-quality steel with clean, flake-free surface
No kinks or bends for smooth de-spooling
Tensile strength optimized at 135,000-165,000 PSI
Ideal for side, saddle, and corner stitching
Recommended for packaging furniture, mattresses, and machine parts
The 031021C Copper Flat Box Stitching Wire is designed for packaging applications requiring strong, reliable stitches.
Stitching cardboard packaging boxes
Carton assembly
Booklet and book binding
Packaging furniture and mattresses
Securing machine parts in corrugated cartons
Wire tensile strength, measured in PSI, determines the force required to break the wire. The 031021C Stitching Wire has an optimal tensile range of 135,000-165,000 PSI, ensuring strong stitches without excessive stiffness. Higher tensile strengths (>165,000 PSI) can prematurely wear stitching heads and trimmer knives, increasing maintenance costs. Lower tensile strengths (<135,000 PSI) may result in soft wire that fails to form proper stitches.
It is used for stitching cardboard boxes, cartons, books, and packaging for furniture, mattresses, and machine parts.
The copper coating provides corrosion resistance and a bright, flake-free finish for aesthetic and durable stitches.
The wire has a tensile strength of 135,000-165,000 PSI, balancing strength and machine compatibility.
It is recommended for materials from 1/16" to 1/2" thick.
Its smooth, kink-free design ensures reliable de-spooling and consistent stitching in high-speed machines.
It is compatible with box stitching machines for side, saddle, and corner stitching; contact KYA Fasteners for specific recommendations.
Ask a QuestionWith over 20 years of expertise, KYA Fasteners is a trusted leader in industrial fasteners, delivering high-quality 21x25 Gauge 031021C Copper Flat Box Stitching Wire. Our SGS-certified production ensures precision and durability, serving clients in over 50 countries. We ship from Qingdao port within 20-30 days, offering customized solutions for packaging and stitching needs.
Global Reach: Exporting to 50+ countries with reliable stitching wire
Premium Quality: Corrosion-resistant, high-performance wire for packaging
Fast Delivery: Ships worldwide in 20-30 days from Qingdao port
Custom Solutions: Tailored wire gauges and finishes for specific applications
Enhance your packaging operations with 031021C Stitching Wire. Request a free quote today to experience KYA's quality and service.
Contact KYA Fasteners
