Transition coupler for rebar (Type AT)

Q: Will the coupler pass GOST and lab testing?

Yes. The splice is full-strength — splice strength ≥95% of the bar's ultimate tensile strength, compliant with GOST 34278-2024. We provide the test report and a free trial kit for incoming inspection and the lab.

Q: How much is the Threaded cylindrical transition coupler Type AT?

From 115 ₽/pc. The price depends on diameter and batch volume — we send the current price for your project within the business day.

Q: Why is a coupler better than welding or a lap splice?

The thread is rolled onto the bar with no loss of cross-section, the splice is full-strength to the rebar body, installation is faster than welding and with no length lost to lapping — rebar savings of up to 25%.

Ø16–40 mmGOST 34278-2024

The Lomax AT threaded transition coupler for joining rebar of different diameters. Cylindrical thread, full-strength splice per GOST 34278-2024. Made by LOMAX, factory price, shipping across Russia and the CIS.

A transition coupler joins two bars of different diameter (Ø1 → Ø2) in one joint: the thread for each diameter is rolled separately.

price from115 ₽/pc incl. VAT

In stock — common Ø sizes from the warehouse
Shipping across Russia and the CIS — delivery terms
Quote in 1 day — tailored to your volume and below your current supplier

Get a quote in 1 day ← Back to “Cylindrical threaded couplers”

In shortThe Type AT transition coupler for rebar is a cylindrical threaded coupler that joins two bars of different diameter (Ø16–40 mm) in one splice: the thread for each diameter is rolled separately. Used at rebar cross-section changes over the height of a building, when splicing columns with different reinforcement and when connecting to starter bars of a different diameter. Full-strength splice per GOST 34278-2024.

Applications

Rebar section transition up the building height, joining columns with different reinforcement, tying to starter bars of a different diameter.

Features

Ø 12–40 mm · cylindrical metric thread
Joint strength ≥ 95% of the bar's tensile strength
Steel 45 / 40Cr · LOMAX laser marking
Installed with a wrench — no welding or lapping
Compliant with GOST 34278-2024 · Lomax TU

Specifications by diameter: Ø16, 18, 20, 22, 25, 28, 32, 36 mm

Sizes: 36. Ø is the spliced-rebar diameter. Price depends on volume — request the current list and we'll reply within the day.

Marking	Ø, mm	Ø2 (transition), mm	Length L, mm	Tightening force ≥, N·m	Material	Price incl. VAT, RUB/pc
Coupler Lomax AT d16-18	16	18	17	140/150	—	115
Coupler Lomax AT d16-20	16	20	17	140/160	—	125
Coupler Lomax AT d16-22	16	22	17	140/220	—	133
Coupler Lomax AT d16-25	16	25	17	140/260	—	148
Coupler Lomax AT d16-28	16	28	17	140/270	—	184
Coupler Lomax AT d16-32	16	32	17	140/340	—	229
Coupler Lomax AT d16-36	16	36	17	140/350	—	243
Coupler Lomax AT d16-40	16	40	17	140/360	—	369
Coupler Lomax AT d18-20	18	20	17	150/160	—	125
Coupler Lomax AT d18-22	18	22	17	150/220	—	133
Coupler Lomax AT d18-25	18	25	17	150/260	—	148
Coupler Lomax AT d18-28	18	28	17	150/270	—	184
Coupler Lomax AT d18-32	18	32	17	150/340	—	229
Coupler Lomax AT d18-36	18	36	17	150/350	—	243
Coupler Lomax AT d18-40	18	40	17	150/360	—	369
Coupler Lomax AT d20-22	20	22	17	160/220	—	133
Coupler Lomax AT d20-25	20	25	17	160/260	—	148
Coupler Lomax AT d20-28	20	28	17	160/270	—	184
Coupler Lomax AT d20-32	20	32	17	160/340	—	229
Coupler Lomax AT d20-36	20	36	17	160/350	—	243
Coupler Lomax AT d20-40	20	40	17	160/360	—	369
Coupler Lomax AT d22-25	22	25	17	220/260	—	148
Coupler Lomax AT d22-28	22	28	17	220/270	—	184
Coupler Lomax AT d22-32	22	32	17	220/340	—	229
Coupler Lomax AT d22-36	22	36	17	220/350	—	243
Coupler Lomax AT d22-40	22	40	17	220/360	—	369
Coupler Lomax AT d 25-28	25	28	17	260/270	—	184
Coupler Lomax AT d 25-32	25	32	17	260/340	—	229
Coupler Lomax AT d 25-36	25	36	17	260/350	—	243
Coupler Lomax AT d 25-40	25	40	17	260/360	—	369
Coupler Lomax AT d 28-32	28	32	17	270/340	—	229
Coupler Lomax AT d 28-36	28	36	17	270/350	—	243
Coupler Lomax AT d 28-40	28	40	17	270/360	—	369
Coupler Lomax AT d 32-36	32	36	17	340/350	—	243
Coupler Lomax AT d 32-40	32	40	17	340/360	—	369
Coupler Lomax AT d 36-40	36	40	17	350/360	—	369

Dimensions are given with a ±1 mm tolerance. The tightening force is a reference value, ≥ the figure shown.

Why it pays off with the LOMAX factory

In-house production

We cut and roll the threads ourselves — we don't resell imported systems (RollCon, Dextra, Bartec). That makes our price structurally lower.

Lower price than imported systems

Direct factory prices, proven over 3 years of supply. We'll beat your current supplier.

GOST 34278-2024 test report

Full-strength splice ≥95% Rm. We include the test report in the document package for the site.

Free trial kit

For incoming inspection and the lab — we remove the risk before the first delivery to site.

Shipping across Russia

From stock and to order, any region and the CIS. Common Ø sizes ship immediately.

Help with the specification

We'll match types and volume to your project and count the couplers from your drawings.

Frequently asked questions

Will the coupler pass GOST and lab testing?

Yes. Splice strength ≥95% of the bar's ultimate tensile strength, compliant with GOST 34278-2024. We provide the test report and a free trial kit for incoming inspection.

What does the price depend on?

On the diameter and batch volume. We send the current price for your project within the business day — usually below your current supplier.

Do you ship across Russia?

Yes, we ship to all regions of Russia and the CIS. Common sizes are from stock, the rest are made to order.

Why is a coupler better than welding or a lap splice?

The thread is rolled with no loss of cross-section, the splice is full-strength to the rebar body, installation is faster than welding and with no rebar overrun on lapping — savings of up to 25%. More — in comparing coupler / welding / lap splice.

Useful on the topic

Rebar couplers by diameter

See all types and prices for a specific Ø:

Ø16 Ø18 Ø20 Ø22 Ø25 Ø28 Ø32 Ø36 Ø40