The code number of this NPT swivel male is 15611SW, the regular size is from 1/4” to 3/4”. The material we can choose is carbon steel Q235 or C45, the surface treatment is Cr3+ eco environment zinc plating.

NPT (National Pipe Thread) male fittings are designed to have tapered threads with a 60 degree included angle. This type of fitting is commonly used in plumbing and fluid systems where a leak-tight seal is required. NPT fittings typically have a female counterpart, and the two fittings are screwed together to form a tight seal.

The regular packaging of NPT Swivel Male is mass packaging, we will use standard export packaging, that is plastic bag+boxes+plywood pallet to protect our goods, we also can proceed custom packaging, such as individual packaging for 10pcs or 20pcs in a small bag, or special boxes, just the packaing cost is higher, so if it is possible, we recommend our general export mass packaging, which is already enough to achieve good sea worthy delivery.

To prevent corrosion of steel material, we will proceed zinc coating on the surface of our metal fittings, zinc coating is a positive coating, and we can identify the performace of zinc plating by sault spray test, the main purpose is to test its anti-rust ability. White rust is the rust of the coating, and red rust is the rust of the substrate. The longer the time of rust generation, the better the quality of the electroplated parts.White rust appears early and the coating is thin, causing red rust to come out quickly. Substrate iron encounters red rust due to corrosion, and red rust is an oxide of iron.White rust is the rust of the electroplating layer itself, and red rust is the rust of the plated parts. Generally, the time of red rust is much longer than that of white rust, because the coating also rusts from the surface. 

Stainless Steel Weld Fittings - ANSI/ASME B36.19

Which is the correct material category in ASTM A123/A123M to specify pipe or tubing used for structural purposes?

This is a common question among specifiers, and the confusion is understandable considering it seems like pipe can fall into two categories in ASTM A123/A123M  Structural Shapes and Plate or Pipe and Tubing. This distinction is important because some steel thickness ranges for the two categories call for different coating thickness minimums. See the bolded line in Table 1 from ASTM A123/A123M.

ASTM A123 Table 1: Minimum Average Coating Thickness (μm) by Material Category

Material Category	All Specimens Tested- Steel Thickness Range (Measured), in. (mm)
	<1/16 [<1.6]	>1/16 to<1/8 [>1.6 to<3.2]	>1/8 to 3/16 [>3.2 to < .8]	>3/16 to<1/4 [>4.8 to<6.4]	>1/4 to<5/8 [>6.4 to<16.0]	>5/8 [>16.0]
Structural Shapes	45	65	75	75	100	100
Strip and Bar	45	65	75	75	75	100
Plate	45	65	75	75	75	100
Pipe and Tubing	45	45	75	75	75	75
Wire	35	50	60	65	80	80
Reinforcing Bar	-	-	-	-	100	100

The correct material category to specify pipe or tubing used for structural purposes is the Pipe and Tubing category because although it serves a structural role, it is still a pipe or tube product.

Coating thickness minimums in ASTM galvanizing specifications are not randomly selected; rather, they come from experience of galvanizing many different steel members and observing the common coating thicknesses achieved on those members. Different material categories in ASTM A123/ A123M often have different steel chemistry when compared to other material categories.

One such difference is pipe and tubing is often aluminum killed rather than silicon-killed, so there is much less or nearly no silicon in pipe and tubing. Because silicon is one of the catalysts for the galvanizing reaction, pipe and tubing often develops a thinner hot-dip galvanized coating because there is less available to catalyze the metallurgical reaction in the galvanizing process.

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