Threaded cylindrical couplers and anchors for construction rebar Ø16–40 mm — standard, transition, anchor and position. Full-strength weld-free splice per GOST 34278-2024.
Standard cylindrical thread — a joint of bars of the same diameter.
Joint of bars of different diameter.
End anchor with a bearing plate.
Anchor with an enlarged bearing area.
With right and left thread (R/L) — without rotating the rebar.
With a lock nut — fixing and protection against loosening.
Positional three-piece — fixed bars.
Welded — one end is welded to the rebar or embedded part.
Bolted — clamped with locking bolts, no bar rotation.
A threaded cylindrical coupler is a steel connecting sleeve with an internal metric thread that mechanically joins two rebar bars into a single working splice without welding or lapping. A thread is formed on the bar ends by a thread-rolling machine (without removing metal or weakening the cross-section), after which the bars are drawn together by the coupler with a torque-controlled wrench. The finished splice is full-strength to the rebar body — its load capacity is no lower than the bar itself.
Such couplers are used on all load-bearing reinforced-concrete structures: columns, walls, pylons, floor and foundation slabs, pile caps, bored piles. A threaded connection is the base technology for splicing rebar Ø16–40 mm of classes A400, A400C and A500C, where a predictable full-strength splice and construction-supervision acceptance are required.
Mechanical rebar splices are governed by GOST 34278-2024. It sets the requirements for strength, deformability and fatigue endurance of the splice: the connection must withstand a load no lower than the bar's nominal resistance and stay serviceable under alternating and cyclic loads. Lomax couplers are tested to this GOST; each batch comes with a quality certificate and test report.
Installing a threaded coupler needs no certified welder, no preheating and no on-site electricity, and is done in any weather. A thread is rolled on the bars, the coupler is screwed onto the first bar, then the second bar is inserted and the joint is tightened with a wrench to the nominal torque. For bars that cannot be rotated there are right/left-hand thread versions (Type AB) and three-part position couplers (Type AF).
Threaded cylindrical is the most common and economical solution for standard frames. Tapered coupler with a tapered thread is more convenient to install and less sensitive to misalignment. Swaged (press) coupler is installed by cold pressing with a hydraulic press right on site and needs no thread cutting — it's chosen when there is no access to the bar end for rolling. A comparison of technologies — in the article "Threaded, tapered and swaged couplers".
Unlike a lap splice, a coupled joint needs no rebar overlap of 30–50 diameters — this saves up to 25% of rebar at splices and relieves congested nodes. Unlike welding, it needs no certified welder, weld quality control or preheating, and splice consistency does not depend on the human factor. A detailed breakdown — in the article "Coupler vs welding vs lap splice".
The base version is the Type B threaded cylindrical coupler (splice of same-diameter bars). Price shown "from", depends on batch volume; exact dimensions for each version (transition, anchor, lock-nut, position) — in the cards above.
| Marking | Ø, mm | Ø2 (transition), mm | Outer Ø, mm | Length L, mm | Tightening force ≥, N·m | Material | Price incl. VAT, RUB/pc |
|---|---|---|---|---|---|---|---|
| Coupler Lomax B d16 | 16 | — | 27±1 | 43±1 | 140 | Steel 45 / 40Cr | 85 |
| Coupler Lomax B d18 | 18 | — | 30±1 | 47±1 | 150 | Steel 45 / 40Cr | 93 |
| Coupler Lomax B d20 | 20 | — | 34±1 | 52±1 | 160 | Steel 45 / 40Cr | 103 |
| Coupler Lomax B d22 | 22 | — | 36±1 | 57±1 | 220 | Steel 45 / 40Cr | 111 |
| Coupler Lomax B d25 | 25 | — | 40±1 | 63±1 | 260 | Steel 45 / 40Cr | 122 |
| Coupler Lomax B d28 | 28 | — | 44±1 | 70±1 | 270 | Steel 45 / 40Cr | 133 |
| Coupler Lomax B d32 | 32 | — | 50±1 | 80±1 | 340 | Steel 45 / 40Cr | 177 |
| Coupler Lomax B d36 | 36 | — | 57±1 | 90±1 | 350 | Steel 45 / 40Cr | 221 |
| Coupler Lomax B d40 | 40 | — | 62±1 | 100±1 | 360 | Steel 45 / 40Cr | 258 |
Dimensions are given with a ±1 mm tolerance. The tightening force is a reference value, ≥ the figure shown.
You can buy couplers Ø16, Ø20, Ø25, Ø32, Ø40 and other sizes from the manufacturer — send a specification and we'll return a calculation and price within 1 business day.
All types and prices for a specific diameter Ø16–40 mm:
ЛОМАКС