# Weld on bung or tap? not automotive related **URL:** \ **Category:** NYSpeed Off Topic\ **Created:** [December 6, 2007, 9:49am UTC](https://forums.speedlife.net/t/weld-on-bung-or-tap-not-automotive-related/39841 "2007-12-06T09:49:08Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![suzukiriderman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/suzukiriderman/32/7421_2.png) [@suzukiriderman](https://forums.speedlife.net/u/suzukiriderman)\ **Post date:** [December 6, 2007, 10:41am UTC](https://forums.speedlife.net/t/weld-on-bung-or-tap-not-automotive-related/39841/9 "2007-12-06T10:41:38Z")
[quote=“newman,post:6,topic:39841"”] is it NPT? 1 1/4 NPT has a pitch of 11.5 TPI, so you will only have 5.75 Threads less the chamfer… For pressure rated applications it’s usually a good idea to have 6 threads of engagement, and about 9 total threads. However, if you’re planning getting it welded, don’t let some hack do it. Pressure vessels are fairly important to have welded properly. [/quote] 1/2" is on the low side too. The hole is beveled a bit on the inside. --- _[View the full topic](https://forums.speedlife.net/t/weld-on-bung-or-tap-not-automotive-related/39841)._