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Engineering Notes
Practical notes on specifying industrial hose fittings — written by the people who machine them. No marketing, just the decisions that actually matter when you are putting an assembly together.
What a king nipple (KC nipple) is, its other names, NPT and BSPT thread data by size, crimp-style dimensions, clamped versus crimped assembly, installation, and the two services it should never see.
Read the guide →Thread angle, crest shape and threads per inch by size, a five-minute identification method, what happens when NPT and BSP are mixed, and which markets use which.
Read the guide →What black, GI, zinc-plated and SS304 mean, which fluids each can carry, where 304 is not enough, mixed-metal corrosion, and what to ask a supplier.
Read the guide →How to pair a tail and a ferrule properly: reading hose ID against OD, choosing between BSPP, BSPT and NPT, picking F50, F60 or F70, deciding crimp versus clamp, and why mixed metals fail at the crimp.
Read the guide →Coupler versus adapter, type letters A to F with DC and DP, BSP or NPT thread, body material and gasket choice, and working pressure by size.
Read the guide →How to measure hose OD over the tail, read EDA to EDG series codes, band width and tightening torque by size, and when a different clamp is the better choice.
Read the guide →Grade R or T by fuel gas, colour code by market, bore size by torch and run length, twin versus single line, and end fittings with check valves and flashback arrestors.
Read the guide →Coming next: BSP versus NPT thread identification in the field, and choosing between 316 and 304 stainless for hose fittings. If there is a specification question that keeps coming up in your work, tell us and we will write it up.