Anaerobic thread sealants LH050, LM012, MH052, LH055, A129, A131, A1044, A1058 for hydraulics, pneumatics, water and low-pressure gas

Country: United Kingdom · Model: LH050/LM012/MH052/LH055/A129/A131/A1044/A1058

Anaerobic thread sealants LH050, LM012, MH052, LH055, A129, A131, A1044 and A1058 for pipes and fittings, replacing PTFE tape and tow. The general-purpose LH050 has a strength of 7 MPa, and grades with separate approvals are available for hydraulics, pneumatics, water, heating and gas up to 50 mbar.

Purpose: sealing threaded joints of pipes and fittings instead of PTFE tape and tow
Grades: LH050 — general-purpose pipe sealant (7 MPa), LH051 — for automatic dispensing; LM012 — hydraulic, filler-free (5 MPa); MH052 — medium strength for coarse threads (10 MPa); LH055 — low strength, PFAS-free (5 MPa); A129 — medium strength; A131 — low strength, easy to disassemble; A1044 — high strength (17 MPa); A1058 — for large-diameter pipes
Max. thread / gap: MH052, LH055 — up to M56 (2 inches), gap up to 0.5 mm
Approvals: MH052 — gas (natural gas, LPG) up to 20 bar, oxygen up to 10 bar/60 °C (BAM); LH055 — DVGW gas, KTW-BWGL and WRAS (drinking water); LH050 Pure — NSF/ANSI 61; LM012 — MIL-S-22473 Grade HVV, ASTM D5363 AN0163

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Technical specifications

Purpose	sealing threaded joints of pipes and fittings instead of PTFE tape and tow
Grades	LH050 — general-purpose pipe sealant (7 MPa), LH051 — for automatic dispensing; LM012 — hydraulic, filler-free (5 MPa); MH052 — medium strength for coarse threads (10 MPa); LH055 — low strength, PFAS-free (5 MPa); A129 — medium strength; A131 — low strength, easy to disassemble; A1044 — high strength (17 MPa); A1058 — for large-diameter pipes
Max. thread / gap	MH052, LH055 — up to M56 (2 inches), gap up to 0.5 mm
Approvals	MH052 — gas (natural gas, LPG) up to 20 bar, oxygen up to 10 bar/60 °C (BAM); LH055 — DVGW gas, KTW-BWGL and WRAS (drinking water); LH050 Pure — NSF/ANSI 61; LM012 — MIL-S-22473 Grade HVV, ASTM D5363 AN0163
Time	LH055 — fixture 30 min, working strength 2 h, full 24 h (M10, zinc, 23 °C)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/10/2026.

Description

The compound is applied to the external thread and, once cured without air, forms a continuous seal without shrinkage that does not creep or fail under vibration. LH051 is intended for automatic dispensing, and LH050 Pure has NSF/ANSI 61 certification. The filler-free hydraulic grade LM012 is listed in MIL-S-22473 (Grade HVV) and ASTM D5363. The PFAS-free LH055 has a breakaway torque of 8 N·m on M10, resists HVO100 biodiesel, AdBlue and washer fluid, and is approved by DVGW for gas and by KTW-BWGL and WRAS for drinking water. The medium-strength MH052 is designed for coarse threads up to M56 and is approved for natural gas and LPG up to 20 bar and for oxygen up to 10 bar at 60 °C (BAM).

How to choose

The grade is chosen by disassembly requirements and the medium. A131 is low strength and easy to disassemble, A129 is medium strength, A1044 is high strength (17 MPa), and A1058 is for large-diameter pipes. This item is used for internal building gas pipelines and for household and commercial gas equipment at pressures up to 50 mbar, while MH052 and LH055 on medium-pressure gas pipelines are covered in a separate item.

Request a price and lead time

Anaerobic thread sealants LH050, LM012, MH052, LH055, A129, A131, A1044, A1058 for hydraulics, pneumatics, water and low-pressure gas. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

Why is an anaerobic sealant better than PTFE tape?

It fills all the voids between the threads, does not shift the fitting during final tightening and does not clog the system with shreds. PTFE tape and tow do not do this.

Which grade should be used for hydraulics where particles are not allowed?

LM012, a filler-free sealant. It is listed in MIL-S-22473 (Grade HVV) and ASTM D5363, with a strength of 5 MPa.

Which grade is approved for drinking water?

LH055 has KTW-BWGL and WRAS approvals, and LH050 Pure is certified to NSF/ANSI 61.

What thread size are MH052 and LH055 suitable for?

Up to M56 (2 inches) with a gap of up to 0.5 mm.

How fast does LH055 cure?

Fixture in 30 minutes, working strength after 2 hours and full strength after 24 hours (M10, zinc, 23 °C).