Swaged Rebar Couplers

Swaged Rebar Couplers provide a full-strength mechanical splice by cold-forging a seamless steel sleeve directly onto ribbed reinforcement steel. Using a portable hydraulic swaging press, the steel sleeve deforms plastically into the rebar ribs, creating a mechanical interlock that exceeds the ultimate tensile strength of the parent bar.

This system eliminates field threading, bar-end heating, and cross-sectional area reduction. It connects standard deformed rebar (#4 to #18 / 12mm to 57mm) in high-seismic, high-fatigue, and congested concrete structures where traditional lap splices cause steel congestion or fail code clearance limits.

Zero Threading Required: Joins shear-cut or flame-cut rebar directly without thread cutting, cold-upsetting, or taper machining.

Full Mechanical Interlock: Cold radial deformation forces sleeve steel into rebar deformations, eliminating slip under load cycles.

100% Bar Break Assurance: Splice design capacity exceeds the actual ultimate tensile strength (fu) of Grade 60, Grade 75, and Grade 80 rebar.

Compact Outer Diameter: Sleek sleeve profile reduces rebar cage congestion, enabling smooth concrete placement and aggregate flow.

Visual Inspection Capability: Complete cold-swaging causes measurable outer diameter reduction and sleeve elongation, allowing instant gauge verification on site.

Our swaged couplers comply with international structural design codes for Type 1 and Type 2 mechanical splices:

ACI 318-19 / ACI 349 / ACI 359: Meets Type 1 (125% fy) and Type 2 (100% fu specification) mechanical splice requirements.

BS EN 1992-1-1 (Eurocode 2): Complies with static, dynamic, and low-cycle fatigue load criteria for reinforcement connections.

AASHTO LRFD Bridge Design Specifications: Approved for main tension ties and seismic plastic hinge zones in bridge piers.

ISO 15835-1 / 2: Class B1/S1 performance certification under static, slip, and cyclic tension-compression testing.

ASTM A706 / A615: Compatible with Low-Alloy Billet Steel and Carbon-Steel Deformed Bars.

Bridge Substructures & Piles: Splicing vertical rebar cages in bored piles, diaphragm walls, and bridge piers where cage stiffness is critical during hoisting.

Nuclear & Containment Buildings: Heavy reinforcement splices subjected to impact, blast resistance, and thermal stress requirements under ACI 349.

High-Rise Core Walls & Columns: Splicing large-diameter rebar (#11 to #18) to replace long lap splices, reducing steel weight and concrete void risks.

Precast Concrete Connections: Splicing starter bars protruding from precast elements in field closure pours and beam-column joints.

Infrastructure Retrofit & Repair: Connecting new reinforcement to exposed existing rebar in bridge widening, dam repair, and structural upgrades.

Step 1: Rebar End Preparation
Ensure rebar ends are free of loose rust, oil, concrete slurry, or extreme bent tips. Flame-cut or shear-cut ends are acceptable; flat facing is unneeded.

Step 2: Marking & Positioning
Mark the required embedment depth (half the coupler length) on both rebar ends using chalk or paint markers. Slide the swaged sleeve completely onto the first bar up to the center stop mark.

Step 3: Hydraulic Cold Swaging
Align the second bar into the sleeve. Position the portable hydraulic swaging press over the sleeve. Apply radial hydraulic pressure sequentially from the center toward both outer edges until the press die closes fully.

Step 4: Quality Verification
Inspect the swaged connection using a passed/failed GO/NO-GO caliper on the outer swaged diameter. Check that the rebar alignment remains within 1.5 degrees tolerance.

Every production batch undergoes destructive and non-destructive quality controls prior to shipment:

Tensile & Elongation Testing: Pull testing to destruction (ASTM A370) ensuring bar rupture occurs outside the coupler sleeve zone.

Cyclic Tension-Compression Test: High-stress low-cycle testing (20 cycles from 0.5 fy to 1.25 fy) to verify performance under dynamic seismic loading.

Low-Slip Verification: Electronic extensometer measurements to ensure slip remains strictly under 0.10 mm.

Metallurgical Analysis: Chemical composition verification (spectrometry) and hardness testing on raw steel tubing to prevent brittle fracture under cold deformation.

Nondestructive Testing (NDT): Magnetic particle testing (MT) on forged sleeves to verify 100% surface integrity without micro-cracks.

Standard Inventory: Ready-to-ship stocks for rebar sizes 16mm, 20mm, 25mm, 32mm, and 40mm in plain finish.

Transition Couplers: Custom machined inner steps to join unequal bar sizes (e.g., #11 to #9 / 36mm to 28mm).

Weldable Half-Couplers: Single-ended swaged sleeves with carbon-equivalent structural steel chamfers for direct welding to structural steel plates, pilings, or liners.

Special Coatings: Hot-dip galvanizing (ASTM A153) or epoxy coating (ASTM A775) for marine and deicing salt environments.

Field Equipment Support: Supply and rental options for custom hydraulic swaging presses, die sets, and field power units tailored to project bar schedules.

To receive an accurate technical quotation and production schedule, submit the following specifications:

Rebar Parameters: Nominal bar sizes (#4 to #18 / 12mm to 57mm), steel grade (e.g., Grade 60, Grade 80, B500B), and deformation profile standard.

Project Code Requirements: Specific design standards required (ACI 318 Type 1/2, Eurocode 2, AASHTO, Caltrans).

Quantity & Delivery Schedule: Total piece count per size and required delivery batches.

Surface Coating: Plain, galvanized, epoxy-coated, or specialized anti-corrosion finish.

Equipment Requirements: Indicate whether hydraulic swaging presses and die sets are needed for site execution or if pre-swaging shop equipment is required.
 

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