Product Description

Dalipu hot galvanized steel pipe tube pipe NPT thread
1.Product Name：Dalipu hot galvanized steel pipe tube pipe NPT thread
2.Standard：API, ASTM, GB, API 5CT, API 5DP, API 5L, ASTM A*******0, ASTM A*******7, ASTM A*******5, GB/T ********0
3.Grade：API J**-API P**0, Cr-Mo alloy, API J*5, API K*5, API L*0, API N*0, API P**0, *3CrMo*4, *0CrMo, *4CrMo4
4.Application：Hydraulic cylinder,automobile,Boiler tube, geological pipe
5.Steel Grade：*8#,*0#,*5#,*0# ,Q**5A,Q**5B,Q**5A,Q**5B
6.length：5.8m/6m or customized
7.Marking：Standard marking, or according to your request.
8.Packaging：by requirements of customers
9.Date of Delivery：Shipped in *0 days after payment
*0.Port of Shipment：Tianjin Port,Tianjin, China
Dalipu hot galvanized steel pipe tube pipe NPT thread
         The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to parallel/straight thread fittings or compression fittings in which the threads merely hold the pieces together and do not provide the seal. As the thread body is tapered (0.*5 in/ft or *2.5 mm/m) a larger diameter keeps compressing into a smaller diameter and finally forms a seal (no clearance remains between the crests and roots of the threads because of the taper). This means that NPT fittings should be burr-free and lubricated using a lubricating material like lubricating paste or tape. The use of tape also helps to limit corrosion on the threads, which otherwise can make future disassembly nearly impossible.
Commonly used sizes are  1⁄8,  1⁄4,  3⁄8,  1⁄2,  3⁄4, 1,  1 1⁄4,  1 1⁄2, and 2 inch.