KYA 21 Gauge Black Annealed Rebar Tie Wire is a 0.8mm low-carbon steel tying wire supplied on a 95m reel for compatible automatic rebar tying machines. Each reel has an approximate net wire weight of 0.4kg and is designed for repetitive reinforcement tying in precast concrete, foundations, rebar cages, bridges, retaining walls and other reinforced-concrete construction.
The listed material is Q195 low-carbon steel with a black annealed finish. Annealing provides the ductility required for repeated bending and twisting during automatic tying, while the black surface is intended for general construction and concrete reinforcement applications.
The 0.8mm × 95m format is comparable in wire diameter and length to legacy 21 gauge automatic rebar-tier consumables such as MAX TW897 and TW897A. Compatibility must still be confirmed by reel outside diameter, width, hub geometry, winding direction and feed-system requirements before ordering replacement wire.
| Specification | Details |
| Product | Black Annealed Automatic Rebar Tie Wire |
| Wire Gauge | 21 Gauge |
| Wire Diameter | 0.8mm / Approx. 0.0315" |
| Wire Length | 95m / Approx. 312ft per reel |
| Net Wire Weight | Approx. 0.4kg per reel |
| Material | Q195 Low-Carbon Steel |
| Heat Treatment | Annealed |
| Surface | Black Annealed / Black Oxide-Type Finish |
| Listed Tensile Strength | 420MPa nominal |
| Listed Elongation | 21% nominal |
| KYA Listed Ties per Reel | Approx. 120–190 depending on tool and tying configuration |
| Legacy Tool References | RB392, RB395, RB397 and RB213-type 21GA systems, subject to reel compatibility verification |
| Typical Applications | Precast Concrete, Foundations, Rebar Cages, Bridges, Retaining Walls, Concrete Floors and Reinforcement Mesh |
For projects requiring certified tensile strength, elongation, chemical composition or material traceability, request current production documentation for the supplied batch before ordering.
The nominal 0.8mm diameter corresponds to the traditional 21 gauge automatic rebar tie-wire class used by many earlier-generation reinforcement tying machines.
Wire diameter alone does not determine machine compatibility. Automatic rebar tiers also depend on spool outside diameter, spool width, hub geometry, reel locking system, winding direction and the dimensions of the internal feeding path.
Each reel contains approximately 95m / 312ft of black annealed wire. This length closely matches the traditional MAX TW897 and TW897A 21 gauge black annealed wire specification used with several legacy Re-Bar-Tier models.
Matching wire length does not by itself prove interchangeability. The complete reel body and feed interface must also match the tying machine.
KYA specifies Q195 low-carbon steel for this tie wire. Low-carbon steel can be annealed to provide the ductility needed for bending, feeding, twisting and cutting during the automatic rebar tying cycle.
Wire consistency is important in automatic tying equipment because irregular diameter, excessive hardness, poor winding or surface defects can affect feeding and knot formation.
Black annealed tie wire is heat treated to improve flexibility and typically has a dark oxide-type surface. It is widely used for general construction, precast concrete and reinforcement work.
The black finish provides only limited corrosion protection compared with galvanized or stainless-steel wire. Black annealed wire should therefore not be presented as the preferred option for prolonged outdoor, marine or aggressive corrosion exposure.
| Wire Type | Typical Selection Consideration |
|---|---|
| Black Annealed | Flexible general-purpose tie wire for construction, precast and reinforcement applications where enhanced corrosion protection is not the primary requirement. |
| Electro-Galvanized | Zinc-coated option where greater corrosion resistance than black annealed wire is required. |
| Plastic Coated | Coated option commonly selected for epoxy-coated reinforcement or applications requiring a cushioned protective surface. |
| Stainless Steel | Higher corrosion-resistant material for applications where the project specification requires stainless tie wire. |
This product page lists a nominal tensile strength of 420MPa and nominal elongation of 21%. These values describe the listed product specification and should not be interpreted as a guarantee for every production batch without supporting test documentation.
| Property | Listed Value | Buyer Consideration |
|---|---|---|
| Diameter | 0.8mm | Confirm machine feed specification and diameter tolerance. |
| Tensile Strength | 420MPa nominal | Request current batch documentation when a controlled tensile range is required. |
| Elongation | 21% nominal | Ductility influences bending and twisting during the tying cycle. |
| Surface | Black Annealed | Suitable primarily for general construction rather than high-corrosion environments. |
KYA lists approximately 120–190 ties per reel for this product. Actual output depends on the automatic tying machine, number of wraps, rebar combination and amount of wire consumed for each tie.
| Factor | Effect on Reel Yield |
|---|---|
| Tool Model | Different tying machines consume different lengths of wire per cycle. |
| Number of Wraps | Additional wraps increase wire consumption and reduce ties per reel. |
| Rebar Size | Larger intersections require a longer wire path around the bars. |
| Machine Setup | Feed, tension and tying settings can influence finished tie geometry and wire consumption. |
The 21 gauge 0.8mm × 95m format is comparable in basic wire dimensions to several legacy MAX black annealed tie-wire systems. However, MAX specifies proprietary reel systems for its tying tools, so aftermarket compatibility must be verified before use.
| Tool Reference | Wire Reference | Compatibility Guidance |
|---|---|---|
| MAX RB397 | TW897A, 21GA / 0.8mm / 95m | Basic wire dimensions match closely, but confirm reel geometry and feeding compatibility before using an aftermarket reel. |
| MAX RB395 | TW897, 21GA / 0.8mm / Approx. 312ft | Legacy 21GA reference. Confirm spool body and tool-specific requirements before substitution. |
| MAX RB392 | Legacy 21GA reel system | KYA references this tool family; verify actual original reel specification and machine condition. |
| MAX RB213 | Legacy 21GA reel system | 21GA black annealed tie-wire systems exist for this tool generation, but exact aftermarket reel compatibility must be verified. |
| Other Automatic Rebar Tiers | Model-Specific | Do not determine compatibility from 0.8mm wire diameter alone. |
Different generations of automatic rebar tying tools use different wire gauges and spool systems. Traditional 21 gauge reels should not be confused with newer twin-wire or heavy-gauge tying systems.
Black annealed automatic tie wire is commonly used in precast plants for securing reinforcement before concrete placement. Its ductile low-carbon steel construction is suitable for repeated automatic twisting when the wire and reel match the tying machine.
For high-volume precast production, consistent reel winding and wire diameter are important because feeding interruptions can reduce tying-machine productivity.
Compatible automatic rebar tiers can use 21 gauge black annealed wire during the assembly of foundations, footings, columns and reinforcement cages.
Tie wire holds reinforcing bars in their intended position during fabrication, handling and concrete placement. The structural capacity of the finished reinforced-concrete element is provided by the designed reinforcement system rather than by the tie wire itself.
Automatic tying wire can be used in bridge decks, pile caps, road structures and other reinforcement work where a compatible automatic tying machine is approved for the application.
Infrastructure projects may specify particular material, coating, traceability or corrosion requirements. Confirm those specifications before selecting black annealed wire instead of galvanized, coated or stainless-steel wire.
21 gauge automatic tie wire can be used in reinforcement grids for retaining walls, concrete floors, walls and other structural concrete components where the machine and tie-wire reel are compatible.
Where reinforcement is exposed to aggressive environments before or during construction, the required tie-wire surface treatment should follow the project specification.
Precast concrete beams and panels
Foundations and footings
Rebar cages
Columns and pile caps
Bridge reinforcement
Road construction
Retaining walls
Concrete floors
Wall reinforcement
Reinforcement mesh
Swimming-pool reinforcement
| Buyer Check | KYA Black Annealed Reel |
|---|---|
| Gauge | 21 Gauge |
| Diameter | 0.8mm |
| Length | 95m / Approx. 312ft |
| Net Weight | Approx. 0.4kg |
| Material | Q195 low-carbon steel |
| Surface | Black annealed |
| Reel Outside Diameter | Compare with original consumable before ordering. |
| Reel Width and Hub | Must fit the tool reel holder and locking mechanism. |
| Winding Direction | Confirm feed direction with the tying machine. |
| Original Part Number | Provide the original wire model when requesting an aftermarket replacement. |
| Tool Model | Provide exact manufacturer and model number. |
KYA supplies black annealed, galvanized, plastic-coated and stainless-steel rebar tie wire for concrete contractors, precast plants, reinforcement fabricators, construction distributors and automatic rebar-tier users.
For bulk purchasing, provide the tying-machine manufacturer and model, original consumable part number, required wire diameter, reel dimensions, surface treatment, quantity and any project-specific material requirements.
KYA supplies automatic rebar tie wire in multiple gauges, materials and surface treatments for concrete reinforcement and rebar tying machines. Available product families include black annealed, electro-galvanized, plastic-coated and stainless-steel wire.
A nominal 0.8mm automatic rebar tie wire corresponds to the common 21 gauge wire class.
This KYA black annealed product is listed at approximately 95m / 312ft per reel with approximately 0.4kg net wire weight.
KYA lists approximately 120–190 ties per reel. Actual yield depends on tool model, rebar combination, number of wraps and wire consumption for each tying cycle.
KYA lists Q195 low-carbon steel with an annealed heat treatment for this product.
The steel wire is heat treated to improve ductility and has a dark oxide-type surface. Black annealed wire is widely used for general construction and concrete reinforcement tying.
No. The black surface provides limited corrosion protection. Galvanized, coated or stainless wire should be considered where greater corrosion resistance is required.
This product page lists a nominal tensile strength of 420MPa. For applications requiring certified mechanical properties, request current production test documentation for the supplied batch.
No absolute guarantee should be assumed. Feeding and breakage depend on wire properties, spool winding, reel geometry, machine condition, cutter condition, feed components and tool setup.
The RB397 original TW897A specification is 21 gauge / 0.8mm and approximately 95m / 312ft, which closely matches this wire's basic dimensions. MAX specifies its own dedicated reel, so confirm aftermarket reel geometry and feed compatibility before use.
The legacy RB395 uses MAX TW897 21 gauge / 0.8mm wire at approximately 312ft per coil. Confirm the complete reel dimensions and machine compatibility before substituting an aftermarket reel.
RB392 and RB213 belong to legacy 21 gauge automatic rebar-tier families and are referenced for this wire class. Verify the original consumable specification and complete reel geometry before ordering replacement reels.
No. Different MAX tool generations use different wire systems. Traditional 21 gauge Re-Bar-Tier tools, newer TwinTier systems and larger-wire platforms do not use the same consumable reels.
No. Wire diameter is a generic dimensional specification and is not exclusive to one machine manufacturer. Compatibility must be determined from the complete reel and machine specification.
No direct interchangeability should be assumed. TW1525 belongs to a different tie-wire system. Compare the exact wire gauge, reel format and machine specification before selecting a replacement.
Black annealed wire is primarily selected for ductility and general construction use. Galvanized wire adds a zinc coating where increased corrosion resistance is required.
Yes. Precast reinforcement is a common application for black annealed automatic tie wire when the tying machine and reel are compatible.
Yes. Foundations, footings, reinforcement cages and columns are common automatic rebar tying applications.
Yes. Bridge and road reinforcement are common applications, subject to the project specification for tie-wire material, surface treatment and traceability.
Provide the tying-machine manufacturer and exact model, original consumable part number, wire gauge, reel outside diameter, spool width, hub dimensions, surface treatment and purchasing quantity.
