KYA 19.5×21 Gauge 037031G Galvanized Flat Stitching Wire is a flat-profile low-carbon steel wire designed for carton stitching, corrugated packaging, printing and binding applications. The wire measures 0.037 × 0.031 inch, approximately 0.95 × 0.80mm.
The zinc-galvanized surface provides corrosion protection and a clean finish for use in compatible stitching equipment. The listed tensile-strength range is 650–950 N/mm² with a dimensional tolerance of ±0.05mm.
For the 19.5×21 size, the reference table lists approximately 283 feet of wire per pound and a recommended work-thickness range of 1/2" to 1". Available spool weights include 2kg, 3.5kg, 10kg, 15kg and 100kg.
| Specification | Details |
| Product Name | 19.5×21 Gauge 037031G Galvanized Flat Stitching Wire |
| Model | 19.5×21 Gauge .037 × .031 Inch |
| Brand | KYA |
| Wire Gauge | 19.5 × 21 |
| Wire Profile | Flat / Rectangular |
| Wire Size – Inch | 0.037 × 0.031 inch |
| Wire Size – Metric | 0.95 × 0.80mm |
| Material | Low Carbon Steel |
| Surface Finish | Zinc-Galvanized |
| Other Finish Option | Copper coating is also listed within the stitching wire range |
| Tensile Strength | 650–950 N/mm² |
| Dimensional Tolerance | ±0.05mm |
| Feet per Pound | Approx. 283 ft/lb |
| Reference Work Thickness | 1/2"–1" |
| Spool Weights | 2kg, 3.5kg, 10kg, 15kg, 100kg |
| Flat Wire Series Range | 0.80 × 0.50mm to 2.50 × 0.50mm |
The 1/2"–1" work-thickness figure is a wire-selection reference rather than a universal stitching-machine capacity. Actual capacity depends on the stitching machine, stitching head, cutter, former, clincher, material construction and operating setup.
The 037031G designation identifies the approximately 0.037 × 0.031-inch rectangular wire dimensions. In metric units, the size is approximately 0.95 × 0.80mm.
When replacing an existing wire, use the actual inch or metric dimensions together with the machine specification. Similar gauge descriptions should not be assumed to be interchangeable without checking the stitching head.
| Wire Gauge | Size (Inches) | Size (mm) | Feet per Pound | Recommended Thickness of Work |
|---|---|---|---|---|
| 18 × 20 | 0.047 × 0.035 | 1.20 × 0.90 | 221 | 5/8"–2" |
| 19 × 21.5 | 0.041 × 0.030 | 1.05 × 0.75 | 283 | 1/2"–1" |
| 19.5 × 21 | 0.037 × 0.031 | 0.95 × 0.80 | 283 | 1/2"–1" |
| 20 × 24 | 0.035 × 0.023 | 0.90 × 0.60 | 408 | Up to 3/16" |
| 20 × 25 | 0.035 × 0.021 | 0.90 × 0.55 | 455 | 1/8"–5/8" |
| 21 × 25 | 0.031 × 0.021 | 0.80 × 0.55 | 559 | 1/16"–1/2" |
The 037031G version uses low-carbon steel with a zinc-galvanized surface. The zinc coating provides corrosion protection for the underlying steel and supports use in carton packaging, printing and binding environments.
The wire is designed with a clean and smooth surface so it can move through correctly maintained wire guides and stitching heads. A consistent coating and wire surface help reduce flaking, contamination and feeding interruptions.
Copper-coated stitching wire is also listed within the KYA stitching wire range. Specify the required surface finish when requesting a quotation.
The listed tensile-strength range for this 037031G product is 650–950 N/mm². Tensile strength affects wire stiffness and influences feeding, cutting, bending and stitch formation in the stitching head.
For stitching equipment that specifies a particular tensile grade, provide the machine or stitching-head requirement when requesting a quotation or sample so the required wire specification can be confirmed.
Available spool weights include 2kg, 3.5kg, 10kg, 15kg and 100kg. Select the spool according to the machine wire holder, de-spooling arrangement and required production run.
| Spool Weight | Ordering Note |
|---|---|
| 2kg | Confirm spool dimensions and machine compatibility. |
| 3.5kg | Confirm spool dimensions and machine compatibility. |
| 10kg | Suitable spool format should be confirmed for the production setup. |
| 15kg | Suitable spool format should be confirmed for the production setup. |
| 100kg | Confirm reel holder and de-spooling requirements before ordering. |
19.5×21 Gauge Galvanized Flat Stitching Wire is intended for high-strength stitching in packaging, printing and binding operations using compatible stitching equipment.
Corrugated cardboard boxes and cartons
Carton box stitching
Book and booklet binding
Side stitching
Saddle stitching
Corner stitching
Inline press stitching
Furniture packaging
Mattress packaging
Machine parts packaging
Before replacing an existing wire, confirm that the stitching machine and stitching head support 0.037 × 0.031-inch flat wire.
Check the required wire dimensions, surface finish, tensile grade, work thickness, spool configuration and machine setup. Providing the machine model, stitching-head model, existing wire label or a wire sample can help confirm the required specification.
A clean wire path from the spool to the stitching head supports consistent wire feeding and stitch formation. Wire guides, spring tubes, felt pads and other wire-contact components should be kept clean and inspected for wear.
The wire should de-spool freely without excessive crossing, kinks or bends. Correct wire routing and regular equipment maintenance help reduce coating damage, flaking and feeding interruptions.
KYA also supplies round stitching wire. The following table is provided as a reference for related round wire products and does not represent the dimensions of the 19.5×21 flat wire on this page.
| Wire Gauge | German Wire Gauge (mm) | m/kg | ASWG (mm) | m/kg | ft/LBS | BWG (mm) | m/kg | ft/LBS |
|---|---|---|---|---|---|---|---|---|
| 21 | 0.80 | 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 | 0.60 | 451 | 0.58 | 482 | 717 | 0.56 | 517 | 769 |
| 25 | 0.55 | 536 | 0.52 | 600 | 893 | 0.51 | 624 | 929 |
| 26 | 0.50 | 649 | 0.46 | 767 | 1141 | 0.46 | 767 | 1141 |
| 27 | 0.45 | 801 | 0.44 | 838 | 1247 | 0.41 | 965 | 1436 |
| 28 | 0.40 | 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 | 0.30 | 1802 | 2682 |
Samples can be arranged for product evaluation. When requesting a sample, provide the required wire dimensions, surface finish, tensile requirement, spool weight and stitching-machine information where available.
Bulk orders and customized solutions are available. Tailored wire dimensions and spool sizes can be discussed for specific carton packaging, printing and binding applications.
KYA Fasteners has more than 20 years of experience in industrial fasteners and states that its production is SGS certified.
KYA supplies customers in more than 50 countries and states that worldwide shipments leave from Qingdao port within 20–30 days.
SGS-certified production
Supply to 50+ countries
Worldwide shipping from Qingdao port
Stated shipping time: 20–30 days
Custom wire dimensions and spool sizes available
The 037031G wire measures 0.037 × 0.031 inch, approximately 0.95 × 0.80mm.
The correct 037031G specification is 0.037 × 0.031 inch, corresponding to approximately 0.95 × 0.80mm.
037031 identifies the approximately 0.037 × 0.031-inch flat wire dimensions. The 037031G model is the galvanized version.
It is used for compatible corrugated carton stitching, cardboard packaging, book and booklet binding, side stitching, saddle stitching, corner stitching and packaging for furniture, mattresses and machine parts.
It is made from low-carbon steel with a zinc-galvanized surface.
The listed tensile-strength range for this product is 650–950 N/mm². If the stitching equipment requires a specific tensile grade, confirm that requirement before ordering.
The listed dimensional tolerance is ±0.05mm.
The listed reference value is approximately 283 feet per pound.
The size table lists a reference work-thickness range of 1/2" to 1". Actual stitching capacity depends on the machine, stitching head, material construction and equipment setup.
No. The stitching machine and stitching head must support 0.037 × 0.031-inch flat wire. Confirm machine compatibility before ordering.
A clean wire path helps reduce friction, coating damage, flaking and feeding interruptions between the spool and stitching head.
Available spool weights are 2kg, 3.5kg, 10kg, 15kg and 100kg.
Yes. Contact KYA Fasteners with the required wire dimensions, spool size and stitching-machine information to arrange a sample for evaluation.
Yes. Customized wire dimensions and spool sizes can be discussed for specific packaging, printing and binding requirements.
KYA states that it supplies customers in more than 50 countries.
KYA states that worldwide shipments leave from Qingdao port within 20–30 days.
