IS 3677 : 1998

Fittings for Copper and Copper Alloy Tubes

BS EN 1254-1
CurrentFrequently UsedSpecificationBIMMEP · Plumbing Fixtures and Valves
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Summary

IS 3677 covers fittings (elbows, tees, couplings) for copper tube systems. Capillary fittings are soldered/brazed; compression fittings use mechanical seal. Used in plumbing, HVAC, medical gas, and fire sprinkler systems.

Specification for capillary and compression fittings for copper tube systems in plumbing, HVAC, and gas installations.

Key Values
Common sizes15, 22, 28, 35, 42, 54mm
Capillary gap0.05-0.15mm
Pressure ratingPN16 typical
Practical Notes
! Use lead-free solder for potable water joints.
! Brazing (>450°C) for HVAC refrigerant and medical gas — soldering is not strong enough.
! Always clean and flux copper tube ends before soldering.
Cross-Referenced Codes
IS 427:2020Wrought Copper and Copper Alloy Tubes for Gen...
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IS 730:2018Copper Wire for General Engineering Purposes
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IS 319:2019Free Cutting Brass Bars, Rods and Sections
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IS 440:2020Flux Cored Solder Wire
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copper fittingscapillary fittingscompression fittingssolder fittingsplumbing