Ultra Coupler
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Features
- A field-installed rebar coupler that connects rebar without separate threading.
- Applicable to weldable and special seismic rebar.
- Meets KS D 0249 requirements for uniaxial tensile, low-cycle fatigue and residual-deformation (static strength) testing.
- Minimizes residual and initial slip to 0.3 mm or less.
- Complies with the national concrete construction specification and Korea Expressway Corporation inspection criteria for rebar joints.
- With knobs and sleeves preassembled on movable rebar, installation can be completed on site in less than one minute.
Specifications
- L1
- Coupler body length
- L2
- Sleeve length
- D1
- Coupler outside diameter
- D2
- Rebar bore diameter
| Type | L1 | L2 | D1 | D2 |
|---|---|---|---|---|
| D13 | 42.0 | 24.5 | 28.5 | 15.5 |
| D16 | 51.5 | 29.5 | 34.0 | 19.0 |
| D19 | 62.5 | 38.0 | 42.0 | 22.5 |
| D22 | 68.5 | 43.5 | 48.0 | 26.5 |
| D25 | 77.0 | 49.0 | 54.0 | 29.0 |
| D29 | 81.0 | 54.5 | 62.0 | 32.5 |
| D32 | 92.0 | 61.0 | 67.0 | 36.5 |
| Tolerance | ± 2 | ± 1.5 | ± 1.5 | ± 1.5 |
Unit: mm ※ Dimensions may change due to product improvement or manufacturing process changes.
Components
-
Coupler
-
Thread Sleeve
-
Shouldered Sleeve
-
Knob
Installation Steps
-
1. Insert the coupler and shouldered sleeve onto one rebar in sequence.
-
2. Position the knob firmly after the first rib of the rebar.
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3. Hand-tighten the shouldered sleeve and knob. Repeat loosening and tightening in the reverse direction two to three times for complete fixation.
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4. Tighten the thread sleeve and knob on the opposite rebar in the same way.
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5. Assemble and lock the coupler and thread sleeve, then use a pipe wrench to tighten until the rebar is fully secured.
Ultra Coupler for Fishbone-Type Rebar
Annual Quality Control and Related Records
Ultra Couplers are quality-tested once each year for SD400, SD500 and SD600 grades. Tensile strength, yield strength and residual deformation results are reviewed as part of routine product quality control.
The latest publicly available reports cover KS D 0249 and KS B 0802 tests conducted by Korea Construction Quality Research Institute (㈜한국건설품질연구소).
Linked reports provide measurements and original images on a web page, rather than a PDF download.
| Grade | Issue date | Sizes | Test items | Result | Record |
|---|---|---|---|---|---|
| SD400 | Oct. 28, 2026 | D13–D32 | Tensile strength · Yield strength · Residual deformation | All tested sizes passed | Measurements & original images |
| SD500 | Jul. 10, 2026 | D13–D32 | Tensile strength · Yield strength · Residual deformation | All tested sizes passed | Measurements & original images |
| SD600 | Apr. 17, 2026 | D16–D32 | Tensile strength · Yield strength · Residual deformation | All tested sizes passed | Measurements & original images |
※ Test items and size ranges may vary by steel grade and issue year.
KCI-ST103:2026 Mechanical Splice Grade Evaluation
SD600 D16, D19, D22, D25 and D29 were tested at Kongju National University.
All five sizes are recorded as Grade 1, with mean residual deformation of 0.079-0.166 mm by size.
- Grade 1 test reports Five sizes, three specimens per size; issued September 3 and 23, 2026
- Test method and official source KCI-ST103:2026 revision notice
Results apply to the tested specimens and listed sizes. Review the complete reports and project requirements before use.
Patents Related to the Ultra Coupler
※ Review the project specifications and site quality requirements before application.
Product selection and quotation
When should an Ultra Coupler be considered?
The Ultra Coupler is a field-assembled rebar coupler that joins unthreaded rebars on site. It is designed to minimize residual deformation.
It can also be used where both rebars are fixed and difficult to rotate.
| Product | Purpose | Site checks |
|---|---|---|
| Ultra Coupler | Field-assembled rebar splicing | Rebar grade, diameter and installation space |
| Terminator | Rebar end anchorage | Anchorage details and design requirements |
| PC Coupler | Rebar splicing for precast structures | Center and length tolerances and exposed rebar length |
| Structural Coupler | Splicing fixed, threaded rebars | Long/short end threads, bar spacing and assembly clearance |
Before applying the product, check the rebar grade and diameter and the site conditions. Review test documentation against the design requirements. Published test results apply to the specified specimens and sizes.
What information is needed for a quotation?
Provide the product, rebar grade and diameter, quantity, site drawings or photos, whether the bars are fixed, available working space and requested delivery date. Junsung Industry will review product suitability, price and delivery requirements through the contact form or by phone at +82-53-581-5819.