It means that the steel nipple is made of seamless steel pipe or weld steel pipe, and makes double-ends processing external threads after the sandstone process.
Black Steel Pipe Nipple Seamless / Welded Dimensions
Steel Nipple Black Seamless/Welded VS Galvanized
1. Material (Similarity):
Both steel nipple blacked and galvanized are Carbon Steel.
2. Thickness (Similarity):
Both steel nipple blacked and galvanized thickness are SCH40 if there is no special requirements.
3. Range of Applications (Similarity):
Standard: ANSI/ASTM A733, DIN 2982, BS 1387, JIS B2302
Size: 1/8"-6"(DN6-DN150)
Finishing: Black, Galvanized.
4. Installation (Similarity):
All black nipple pipe and galvanized are connected with the female threaded end, installation is no difference.
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