Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Protecting Threads during galvanizing

"Hot Dip Galvanizing of Steel Structures"
by Kuklik & Kudlacek

on AbeBooks

or Amazon or eBay

(affil links)

"Handbook of Hot Dip Galvanization"
by Maass & Peissker

on AbeBooks

or eBay or

Amazon

(affil links)

How do I avoid threaded portion while galvanizing. if threaded portion is exposed to coating, fittings don't enter thread. Thread gets jammed. How to avoid it on CS Sch 80 pipe.

Please advice.

Ajit Nair
- India

Dear mr Ajit Nair,

The common way people do this in India is to cut the thread to a lower size say 6 G before and 6H after plating . What you need is a wider range of overall 200 microns on OD between before and after Hot Dip galvanising, and a light retapping over the threads once again after the HDG just to ensure you are not removing all of the zinc in the tapping.

cheers,

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2000

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: