## Tolerance Zone Size

rnoo

.DIP

This feature control frame specifies the tolerance zone as a circle of diameter .010 at MMC, centered according to the basic dimensions given. The size of the tolerance zone is dependent on the size of the hole.

A feature control frame can specify the size of the tolerance zone at MMC, LMC or RFS (regardless of feature size).

Hole diameter

.251

.252

.253

.254

Tolerance Zone diameter

Determining Tolerance Zone Size

Does this feature meet the true position tolerance?

Step 1: What can we measure?

Step 2:

Calculate deviations in x and y directions. How does this compare to the basic dimensions?

Step 3: Determining the True Position

Tolerance zone, dia. = TZ

Desired position Actual hole center

A hole center that deviates from true position by jc and y lies within a tolerance zone of diameter Z. If Z > TZ, the part is bad.

Co-ordinate Difference

Co-ordinate Difference

015 014 013 012 Oil 010

008 it Q

True Position and Perpendicularity

This feature control frame specifies the true position tolerance of the hole with respect to 3 datum planes. The order that the datum planes are listed in the feature control frame indicates the priority of each datum. Datums B and C provide reference for the x and y position of the hole center, and datum A controls the perpendicularity of the hole axis .

Referencing datum A means that the center axis of the hole must be perpendicular to datum plane A. The axis must intersect datum plane A inside the tolerance zone

Permissible hole axis variation

.010" wide tolerance zone

+2 -3

### Responses

• Goldilocks Hayward
How to true position tolerance a hole?
8 years ago
• richard mckenzie
What is zone in engineering drawing?
8 years ago
• Mewael
How we calculate hole position tolerances?
7 years ago
• sabrina schwartz
What is tolerance zone in engineering?
3 years ago
• Iggi Daniel
What is tolerance for a hole in engineering drawing?
2 years ago
• tanja
What is the tolerance zone based on fcf on an engineering drawing?
11 months ago
• ARRAN
What is the tolerance zone diameter at lmc?
10 months ago
• ULRIKE
What is the tolerance zone size?
6 months ago
• griffo
How to calculate tolerance zone based on area?
5 months ago
• timba
When a geometric tolerance is applied rfs, the tolerance zone size?
5 months ago
• MEDHANE
How to find tolerance zone diameter of lmc?
5 months ago
• Asmarina
How to determine tolerance zone diameter at LMC?
5 months ago
• lamorac
What is the .500 hole position perpendicularity tolerance at LMC size?
17 days ago
• liberato
How to find tolerance zone of a hole?
2 days ago