Is the Two-Part Cast Iron Hose Clamp with Catches, DIN 20039 B suitable for use with flat hoses marked “FL” at pressures up to 25 bar?

Yes. The Two-Part Cast Iron Hose Clamp with Catches, DIN 20039 B marked “FL” is specifically designed for flat hoses and, when installed correctly with a properly selected hose and matching fitting, provides dependable performance at working pressures up to 25 bar. Its galvanized ductile cast iron construction with yellow passivation (hexavalent chromium-free), combined with robust hooks, separate pressure pads and an integrated locking mechanism, ensures secure fastening, corrosion resistance and long-term reliability even under demanding conditions.

Can the Two-Part Cast Iron Hose Clamp with Catches, DIN 20039 B be used in corrosive environments without additional coating or protection?

Two-Part Cast Iron Hose Clamp with Catches, DIN 20039 B is manufactured from high-quality galvanized ductile cast iron with yellow passivation free from hexavalent chromium and is described as offering outstanding durability and corrosion resistance even under demanding conditions. That finish provides good general corrosion protection and makes the clamp suitable for many aggressive environments without immediate need for additional coating. However, whether it can be used without further protection depends on the specific corrosive environment (type and concentration of chemicals, temperature, exposure duration, salt spray, etc.). For highly corrosive media (strong acids/alkalis, chloride-rich marine atmospheres, constant immersion, or aggressive chemical exposure), additional protective measures (special coatings, stainless steel components, or sacrificial protection) may be advisable to ensure long-term performance. Conclusion: For typical industrial and moderately corrosive conditions the Two-Part Cast Iron Hose Clamp with Catches, DIN 20039 B should perform well without extra coating. For severe or specialized corrosive environments, consult material compatibility data and consider additional protection or alternative materials.

A clamp two-part for hose with lugs, DIN 20039 B, cast iron

Additional information

Material	CS – steel (cast iron)

A clamp two-part acc. to DIN 20039 B, with lugs (“claws”) and with separate inserts – “tongues” pressure, made with high quality cast iron ductile galvanized (with yellow passivation free od chromium hexavalent). Intended for fastening hose, of coupling with part hose with a lock securing. indexes marked on the end letters “FL”, intended are for hoses flat. Material: malleable cast iron galvanized. at appropriate mounting, appropriate selected hose and the tip pressure working up to 25 bar.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
LU-SK-29	Clamp cast iron 2-part with lugs for 13 mm hose, range 22÷29 mm	-	-	In stock	Enquiry
LU-SK-29-FL	Clamp cast iron 2-part with lugs for hose flat 19x2 mm	-	-	In stock	Enquiry
LU-SK-34	Clamp cast iron 2-part with lugs for 19 mm hose, range 28÷32 mm	-	-	In stock	Enquiry
LU-SK-34-FL	Clamp cast iron 2-part with lugs for hose flat 25x2 mm	-	-	In stock	Enquiry
LU-SK-39	Clamp cast iron 2-part with lugs for 25 mm hose, range 35÷42 mm	-	-	In stock	Enquiry
LU-SK-44	Clamp cast iron 2-part with lugs for 28 mm hose, range 42÷45 mm	-	-	In stock	Enquiry
LU-SK-51	Clamp cast iron 2-part with lugs for 35 mm hose, range 45÷53 mm	-	-	In stock	Enquiry
LU-SK-60	Clamp cast iron 2-part with lugs for 42 mm hose, range 55÷60 mm	-	-	In stock	Enquiry
LU-SK-73	Clamp cast iron 2-part with lugs for 50 mm hose, range 60÷73 mm	-	-	In stock	Enquiry
LU-SK-75	Clamp cast iron 2-part with lugs for 75 mm hose, range 86÷102 mm	-	-	In stock	Enquiry
MU-1322	Clamp 2-part with paz. 20÷29 mm (1/2")	-	-	In stock	Enquiry
MU-1323	Clamp 2-part with paz. 28÷33 mm (3/4")	-	-	In stock	Enquiry
MU-1324	Clamp 2-part with paz. 35÷42 mm (1")	-	-	In stock	Enquiry
MU-1325	Clamp 2-part with paz. 42÷45 mm (1.7/64")	-	-	In stock	Enquiry
MU-1327	Clamp 2-part with paz. 55÷60 mm (1.5/8")	-	-	In stock	Enquiry
MU-1328	Clamp 2-part with paz. 60÷73 mm (2")	-	-	In stock	Enquiry
MU-1329	Clamp 2-part with paz. 70÷90 mm (2.1/2")	-	-	In stock	Enquiry

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A clamp two-part acc. to DIN 20039 B, with lugs (“claws”) and with separate inserts – “tongues” pressure, made with high quality cast iron ductile galvanized (with yellow passivation free od chromium hexavalent). Intended for fastening hose, of coupling with part hose with a lock securing. indexes marked on the end letters “FL”, intended are for hoses flat. Material: malleable cast iron galvanized. at appropriate mounting, appropriate selected hose and the tip pressure working up to 25 bar.