Parallel Roll Threaded Coupler

Cold-roll forming displaces steel outward, preserving the full bar cross-section and enhancing surface hardness for maximum tensile strength retention.

16-40mm

Bar Range

Rolled

Thread

Zero

Area Loss

Type 2

Grade

See What Fits Your Needs

Full Section Integrity

Parallel Roll Threaded systems use cold-roll forming to create strong, precise threads without removing material, ensuring full strength and high-performance splicing.

Cold-roll forming process (no material cutting or loss)

Thread area meets or exceeds parent bar strength

Enhanced surface hardness due to cold working

Ideal for high-tensile rebar where strength retention is critical

Consistent parallel threads allow tight fit and easy visual inspection

Certified to BS 8597 Type 2 for superior strength and ductility

BS 8597 T2

Zero Loss

Seismic

Why Cold Forged?

Zero Material Loss:
Roll-forming displaces rather than removes steel, maintaining full bar cross-section at the splice zone.

Enhanced Surface Hardness:
Cold-working during rolling increases surface hardness and fatigue resistance, thread is stronger than the parent bar.

Type 2 Splice Compliant:
Meets the most stringent mechanical splice requirements including seismic, nuclear, and critical infrastructure applications.

Superior Fatigue Life:
Compressive residual stresses from rolling significantly improve fatigue performance under dynamic and cyclic loads.

Roll-Thread to Verified Splice

Cut Square

Bar end is cut perpendicular with a mechanical cutter – burr-free and within 2° of perpendicular.

Roll Thread

Cold-roll die-head is applied to the bar end- no material removed, thread crest forms above the bar OD.

Thread Gauge

Go / no-go thread gauge confirms correct thread geometry before assembly, rejecting out-of-spec bars immediately.

Assemble & Verify

Bars are threaded into the sleeve to the specified make-up. Protruding thread end confirms correct engagement.

Available Bar Sizes

Size ID (mm)	Thread Pitch (mm)	Size OD (mm)	Length (mm)	Material
16	20 × 2.5	28	40	EN8D
20	24 × 3	32	48	EN8D
25	29 × 3	40	60	EN8D
32	35 × 3	50	72	EN8D
40	45 × 4	63	90	EN8D

Industries We Serve
Our couplers are trusted across diverse sectors that demand performance without compromise.

Industrial Construction

Infrastructure & High-Rise Buildings

Bridges & Metro Projects

Commercial Complexes

Residential Projects

Darmaa Metal Product