"R1/4" Thread. What Is It? - EngineeringClicks

• Articles General Articles Fun and Videos Mechanical Engineering Manufacturing Processes Engineering Materials 3D Printing and Prototyping Calculations Thermal
• Home
• Forums New posts
• What's new New posts Latest activity

Log in Register What's New?

• New posts

Menu Log in Register Install the app Install How to install the app on iOS

Follow along with the video below to see how to install our site as a web app on your home screen.

Note: This feature currently requires accessing the site using the built-in Safari browser.

• Home
• Forums
• Mechanical design
• Manufacturing processes
• Machining

You are using an out of date browser. It may not display this or other websites correctly.You should upgrade or use an alternative browser. "R1/4" thread. What is it?

• Thread starter GarethW
• Start Date May 26, 2011

GarethW

Chief Clicker

Staff Member I need to fit this part (pictured below) to something. It has a "R1/4" thread. Anyone know what that means? Is it an ordinary 1/4" BSP thread or is it some kind of fancy thread with non-parallel sides? .

PWASS

Well-Known Member

Gareth The 'G' and 'R' thread designations were added when BSP threads were adopted by the metric system for pipe threads. 'G' is the same as BSPP (parallel thread), 'R' is the same as BSPT (tapered thread).

GarethW

Chief Clicker

Staff Member Thanks for the help. I had some samples come through today in the post. The overall diameter of the thread measures more like 1/2", so I'm pretty confused about the "1/4" designation. I made some measurements in metric: the diameter of the thread is 12.9mm at the top, tapering up to 13.3mm at the base. The length of the threaded part is 11mm. I'll drop the samples off to a machinist on Tuesday. Hopefully he can cut the right type of female thread for me.

PWASS

Well-Known Member

Gareth BSP Pipe threads are sized according to the thread that can be machined onto that size bore pipe, so a 1/4" BSP thread measures 0.518" or 13.15mm Tapered threads are used when a shoulder is not available to seal against like threading the OD of a pipe and should be screwed into a female tapered thread. Tapered threads are prone to leakage but have the benefit of being positional. O

Oleg

New Member

Look at this... or this T

tjm-mmtp-21

New Member

R1/4 is 1/4" BSP tapered thread. Just a new terminology for this type of thread. Regards Tim www.mmturnedparts.co.uk O

Oilytrunk

Well-Known Member

GarethW said: I need to fit this part (pictured below) to something. It has a "R1/4" thread. Anyone know what that means? Is it an ordinary 1/4" BSP thread or is it some kind of fancy thread with non-parallel sides? . Click to expand...

The pic is deleted. You must log in or register to reply here. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link

• Home
• Forums
• Mechanical design
• Manufacturing processes
• Machining

• This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Accept Learn More.…

Back Top