What does NO GO mean on a thread gage

P

plannergal

#1
On threaded features checked with a GO / NO GO thread gage for conformance:
Is it aceptable for the NO GO side of the gage to start into the threaded hole?
Is there a specification / standard that addresses this?
The rule of thumb here has been two turns maximum is all-right.
If the threaded feature is half an inch deep I can see this as not being a problem. But when the threaded feature is going through a wall thickness that allows for only a limited number of threads this seems contradictory.
Thanks in advance for helping to enlighten me.
 
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Jen Kirley

Quality and Auditing Expert
Staff member
Admin
#2
A Go/No Go gage is made as a quick check for dimensions. The "Go" side is small enough to fit, but the "No Go" side is supposed to be beyond the tolerance.

If a threaded part of a No Go gage fits part way, there could be two different causes: the gage is warn down to nearly the size of the Go gage, or the part is large enough on the end for the gage to fit in a little.

The organization and its customer sets acceptance standards for if, and how much of this part-way fit allowed.
 

bobdoering

Stop X-bar/R Madness!!
Trusted Information Resource
#6
Threads are notoriously interpreted differently by various locations. You might find an interpretation in a particular source, but you will find a different one in another source. Taper threads are treated differently that straight. Worse yet, from my experience, is that the customer will have their own interpretation - not only for turns to fail, but pressure to apply, etc. (Since they write the checks, it is good to know what they want.) Some want a go gage to spin on with virtually no torque, and others will crank the daylights out of a no go gage and say you fail. To be fair - whatever you do for the go gage (as far as torque) it needs to be the same for no go or you are artificially tightening the spec.
 
J

Jeff Frost

#7
Planergal

The GO plug must enter and pass through the full length of the product freely and the NOT-GO plug must not exceed three full turns.

The applicable standards are

ASME/ANSI B1.2-1983 Gauges And Gauging For Unified Inch Screw Threads
ASME/ANSI B1.3M-1992 Screw Thread Gauging Systems Dimensional Acceptability Inch Metric Screw Threads
MIL-STD-120-1950 Gage Inspection

Bobdoering

Nothing notorious about understanding thread inspection when knowledge is applied based on a national/international standard.
 
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Jim Wynne

Staff member
Admin
#8
Planergal

The GO plug must enter and pass through the full length of the product freely and the NOT-GO plug must not exceed three full turns.

The applicable standards are

ASME/ANSI B1.2-1983 Gauges And Gauging For Unified Inch Screw Threads
ASME/ANSI B1.3M-1992 Screw Thread Gauging Systems Dimensional Acceptability Inch Metric Screw Threads
MIL-STD-120-1950 Gage Inspection

Bobdoering


Nothing notorious about understanding thread inspection when knowledge is applied based on a national/international standard.
This information may be useful to the OP, but international (or any other standards) have no standing unless unless they are agreed upon by customer and supplier.
 
Q

QM Mary

#9
While it may be true that different people will want the threads to be a certian way does not mean the engineer who drew the blueprint meant for them to stray from the ansi standards. Please look at your tolerance box on the print does it not say ansi standards apply. Unless you have a specific tolerance on the print you are bound by ansi standard. Some inspectors simply just do not know how to use a thread gage. And if done correctly giving your customer a little guidance is never a bad thing.
 

Jim Wynne

Staff member
Admin
#10
While it may be true that different people will want the threads to be a certian way does not mean the engineer who drew the blueprint meant for them to stray from the ansi standards. Please look at your tolerance box on the print does it not say ansi standards apply. Unless you have a specific tolerance on the print you are bound by ansi standard. Some inspectors simply just do not know how to use a thread gage. And if done correctly giving your customer a little guidance is never a bad thing.
If a drawing just says that ANSI standards apply, you don't have enough information. There are thousands of ANSI standards. As far as threads are concerned, unless a specific standard is explicitly called out, there is no standard other than what the customer expects.
 
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