Gdt Chart 3m271
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GEOMETRIC DIMENSIONING SYMBOLS, RULES, AND GUIDELINES
FACTS TO – MMC – MAXIMUM MATERIAL CONDITION: M THAT CONDITION WHERE A FEATURE OF SIZE CONTAINS THE MAXIMUM AMOUNT OF MATERIAL WITHIN THE STATED LIMITS OF SIZE. EXAMPLE: MINIMUM HOLE SIZE AND MAXIMUM SHAFT SIZE.
TYPE
.500
TOLERANCE ZONE
STRAIGHTNESS
.500
.005
FORM
.500
.500
TWO CONCEN– TRIC CYLINDERS .004 APART
.005 .004
CYLINDRICITY
TWO PARALLEL PLANES.004 APART
.004 A A
A
ORIENTATION
PARALLELISM
TWO PARAL– LEL PLANES .004 APART A
.004 A
A
PERPEN– DICULARITY
90˚ TWO PARALLEL PLANES .004 APART 15˚ A
.004 A – DIAMETER SYMBOL: THIS SYMBOL REPLACES THE WORD "DIAMETER." IT SHOULD BE USED ANYWHERE THERE IS A DIAMETER ON THE DRAWING, AND WHEN A TOLERANCE ZONE IS CYLINDRICAL.
15˚ A
ANGULARITY
– DATUM TARGETS: USED TO LOCATE SPECIFIC POINTS, LINES, OR AREAS A1 ON PARTS USED FOR FOR MACHINING AND INSPECTION COMMONLY USED ON RIGID PARTS LIKE CASTINGS AND FORGINGS AND NON-RIGID PARTS MADE FROM PLASTIC, RUBBER, OR SHEET METAL.
PROFILE OF A LINE
PROFILE OF A SURFACE
A
RUNOUT
CONCENTRIC CIRCLES A .004 APART
A
CIRCULAR RUNOUT
.004 A
TWO CONCENTRIC CYLINDERS A .004 APART
A
TOTAL RUNOUT .250
.004
B RESTRICTED MOVEMENT
.014 ZONE AT MMC
.380
.620
POSITION A
.620 C
B
PARALLEL LINES
.005 M
TERTIARY DATUM (ONE POINT MIN) SECONDARY DATUM (TWO POINTS MIN)
MODIFIER FOR THE STATED TOLERANCE NO
NO
D
NO
B
DOES NOT APPLY
NO
NO
E
STATED TOLERANCE
M OR
L
M OR
YES IF
G H
YES IF YES
J A D
M
G
IS STATED
H
YES IF YES
G
IS STATED
H
NO
C
J
DOES NOT APPLY
MAY BE USED OR MAY NOT
NO
RFS ALWAYS
YES
NO
B
RFS ALWAYS
YES
NO
E
YES IF
G
M
H
IS STATED
J
D E F
L
YES
EXAMPLE:
J
.500
.507 .005 M
A
D
M
MAY BE USED OR MAY NOT
CAN APPLY TO A FEATURE OF SIZE.
BONUS TOLERANCE: WHEN MMC IS SHOWN MODIFYING A PARTICULAR TOLERANCE, THE STATED TOLERANCE APPLIES ONLY WHEN THE FEATURE BEING CONTROLLED IS AT MMC. THE BONUS IS THE DIFFERENCE BETWEEN THE ACTUAL SIZE AND THE MMC SIZE AND MAY BE ADDED DIRECTLY TO THE ORIGINAL TOLERANCE.
A
DOES NOT APPLY
M OR
RELATIVE TO
D
M
L
CAN APPLY TO A FEATURE OF SIZE.
A B C
WITHIN
EXAMPLE: THE POSITION OF THE FEATURE AXIS MUST BE WITHIN A .005 TOLERANCE ZONE AT MMC RELATIVE TO DATUM FEATURES A, B, AND C.
A
IS STATED
YES
L
CAN APPLY TO A FEATURE OF SIZE.
BASIC SENTENCE STRUCTURE: WHEN USING THE ENGLISH LANGUAGE TO SAY WHAT IS IN THE FEATURE CONTROL FRAME. YOU MAY USE THE FOLLOWING CONNECTING WORDS: .005 M
ACTUAL MMC
.503 .500
BONUS
.003
AT MMC THE HOLE MUST BE POSITIONED WITHIN A CYLINDRICAL TOLERANCE ZONE OF .005 DIAMETER. AS THE EXAMPLE SHOWS, THE HOLE HAS DEPARTED FROM MMC BY .003. THE .003 BONUS TOLERANCE MAY NOW BE ADDED TO THE ORIGINAL .005 ZONE FOR A TOTAL OF .008 TOLERANCE. FUNCTIONAL GAGES: DEVICES THAT MEASURE THE COLLECTIVE EFFECTS OF SIZE AND GEOMETRIC TOLERANCES AT THE SAME TIME. IT REPRESENTS A SIMULATED MATING CONDITION. BONUS TOLERANCES AND FUNCTIONAL GAGES: DIRECTLY APPLICABLE TO ANY GEOMETRIC CHARACTERISTIC THAT IS MODIFIED BY M . SHIFT: AS A DATUM FEATURE OF SIZE, THAT IS GEOMETRICALLY CONTROLLED, DEPARTS FROM MMC, ADDITIONAL TOLERANCE MAY BE CONSIDERED FOR THE CONTROLLED FEATURES. THIS ADDITIONAL TOLERANCE DOES NOT ADD DIRECTLY TO THE ORIGINAL TOLERANCE BUT MUST BE APPLIED TO THE PATTERN OF FEATURES AS A GROUP. IT IS CONSIDERED A TOLERANCE THAT ALLOWS THE CONTROLLED FEATURES TO SHIFT AS A GROUP. VIRTUAL CONDITION: THE COLLECTIVE EFFECT OF SIZE AND GEOMETRIC TOLERANCES THAT MUST BE CONSIDERED IN DETERMINING THE FIT OR CLEARANCE BETWEEN MATING PARTS OR FEATURES. TO CALCULATE VIRTUAL CONDITION: EXTERNAL FEATURES: MMC SIZE + TOLERANCE OF FORM, ORIENTATION, OR LOCATION INTERNAL FEATURES: MMC SIZE – TOLERANCE OF FORM, ORIENTATION, OR LOCATION
.004 AROUND DATUM AXIS
.004 A
A VIRTUAL CONDITION WILL EXIST ONLY FOR TOLERANCES THAT CONTROL SIZE FEATURES.
A CONCEN– TRICITY
RFS ALWAYS
YES
NO
RFS ALWAYS
YES
NO
J
D
PARALLEL PLANES
THIS CHART IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. THE INFORMATION IS BASED UPON ASME Y14.5M - 1994.
G H
GENIUM PUBLISHING CORP. ONE GENIUM PLAZA SCHENECTADY, NY 12304 (518) 377-8854
.004 EQUALLY DISPOSED FROM CENTER PLANE
.004 A
PARALLEL LINES
* THIS COLUMN INDICATES POSSIBLE TOLERANCE ZONES THAT MAY BE USED WITH THE VARIOUS CONTROLS. THE DIFFERENT TOLERANCE ZONES ARE SHOWN ALONG THE BOTTOM OF THIS CHART.
A
SYMMETRY
C
A B C
PRIMARY DATUM (THREE POINTS MIN)
.380
A
PARALLEL LINES
J
A
PITCH DIAMETER RULE: TOLERANCES THAT APPLY TO SCREW THREADS APPLY TO THE AXIS OF THE THREAD DERIVED FROM THE PITCH CYLINDER. IF ANOTHER PART OF THREAD IS TO BE USED TO DERIVE THE AXIS, IT MUST BE STATED BENEATH THE FEATURE CONTROL FRAME. ANY OTHER FEATURE THAT HAS A PITCH DIAMETER MUST HAVE THE DATUM FEATURE STATED.
A
IS STATED
FEATURE CONTROL FRAME:
TRUE CENTER
LOCATION
GEOMETRIC TOLERANCE RULE: GEOMETRIC TOLERANCES ARE UNDERSTOOD TO BE APPLIED RFS. IF MMC OR LMC IS REQUIRED, IT MUST BE PLACED IN THE FEATURE CONTROL FRAME. SEE MMC, LMC, OR RFS COLUMN.
H
.022 ZONE AT LMC
.014 M A B C FREE MOVEMENT
LIMITS OF SIZE RULE: WHERE ONLY A SIZE DIMENSION IS GIVEN. a) THE SIZE DIMENSIONS AT ANY CROSS SECTION MUST BE WITHIN THE SIZE TOLERANCE. b) THE SURFACE(S) SHALL NOT EXTEND BEYOND THE PERFECT FORM DEFINED BY THE MMC SIZE. c) THE FORM MAY VARY WITHIN AN ENVELOPE BETWEEN THE MMC AND LMC.
M
NO
NO
CAN APPLY TO A FEATURE OF SIZE.
TWO PLANES .004 APART ALONG TRUE PROFILE A
.004 A
.004 A DATUM REFERENCE FRAME: (THREE PLANE CONCEPT). THE CONCEPT OF USING MUTUALLY PERPENDICULAR FEATURES OF A PART TO CONTROL ITS FREE MOVEMENT IN SPACE (DEGREES OF FREEDOM). SEE DATUM SYMBOL AND DATUM TARGETS.
A
DOES NOT APPLY
M OR
TWO LINES .004 APART ALONG TRUE PROFILE
.004
PROFILE
TOLERANCE ZONES: ALL TOLERANCE ZONES SHOWN IN THE FEATURE CONTROL FRAME ARE TOTAL. EXAMPLE: FLATNESS WITHIN .004 MEANS THAT TWO PARALLEL PLANES NO MORE THAN .004 APART DEFINE THE TOLERANCE ZONE.
YES IF
GEOMETRIC CHARACTERISTIC SYMBOL
TWO CONCEN– TRIC CIRCLES .004 APART
.005 .004
– FREE STATE: THIS SYMBOL INDICATES F THE PARTS MUST NOT BE RESTRICTED DURING INSPECTION.
TOLER ZONE TYPE
DIAMETER SYMBOL (CYLINDRICAL TOLERANCE ZONE)
CIRCULARITY
ST – STATISTICAL TOLERANCE: A TOLERANCE FOR A PART OF AN ASSEMBLY BASED ON THE RESULTS FROM A STATISTICAL CALCULATION. THE DESIRED RESULT IS LARGER TOLERANCES.
– BASIC DIMENSION: THESE DIMENSIONS HAVE NO TOLERANCE. THEY ONLY LOCATE A TOLERANCE ZONE.
DOES NOT APPLY
FACTS TO
FUNC GAGE USED
DATUM USED
L
CAN APPLY TO A FEATURE OF SIZE.
TWO PARALLEL PLANES, .004 APART
.004
– PROJECTED TOLERANCE ZONE: WHEN THE SYMBOL IS SHOWN, IT MEANS THE STATED TOLERANCE ZONE IS EXTENDED BEYOND THE SURFACE OF THE PART, NOT WITHIN THE PART.
– DATUM SYMBOL: THIS SYMBOL IS ATTACHED TO A PLANE OR SIZE FEATURE THAT MUST BE ED FOR MACHINING AND INSPECTION.
M OR
FLATNESS
P
A
MMC LMC OR RFS
TWO PARALLEL LINES .004 APART
.005 .004
– LMC – LEAST MATERIAL CONDITION: L THAT CONDITION WHERE A FEATURE OF SIZE CONTAINS THE LEAST AMOUNT OF MATERIAL WITHIN THE STATED LIMITS OF SIZE. EXAMPLE: MAXIMUM HOLE SIZE AND MINIMUM SHAFT SIZE. RFS – REGARDLESS OF FEATURE SIZE: THIS IS THE DEFAULT CONDITION FOR ALL GEOMETRIC TOLERANCES. NO BONUS TOLERANCES ARE ALLOWED. FUNCTIONAL GAGES MAY NOT BE USED.
AS SHOWN ON DRAWING
SYMBOL
E
PARALLEL PLANES
F
PARALLEL PLANES
G
PARALLEL PLANES
H
PARALLEL PLANES
J
CYLINDER ZONE
FACTS TO – MMC – MAXIMUM MATERIAL CONDITION: M THAT CONDITION WHERE A FEATURE OF SIZE CONTAINS THE MAXIMUM AMOUNT OF MATERIAL WITHIN THE STATED LIMITS OF SIZE. EXAMPLE: MINIMUM HOLE SIZE AND MAXIMUM SHAFT SIZE.
TYPE
.500
TOLERANCE ZONE
STRAIGHTNESS
.500
.005
FORM
.500
.500
TWO CONCEN– TRIC CYLINDERS .004 APART
.005 .004
CYLINDRICITY
TWO PARALLEL PLANES.004 APART
.004 A A
A
ORIENTATION
PARALLELISM
TWO PARAL– LEL PLANES .004 APART A
.004 A
A
PERPEN– DICULARITY
90˚ TWO PARALLEL PLANES .004 APART 15˚ A
.004 A – DIAMETER SYMBOL: THIS SYMBOL REPLACES THE WORD "DIAMETER." IT SHOULD BE USED ANYWHERE THERE IS A DIAMETER ON THE DRAWING, AND WHEN A TOLERANCE ZONE IS CYLINDRICAL.
15˚ A
ANGULARITY
– DATUM TARGETS: USED TO LOCATE SPECIFIC POINTS, LINES, OR AREAS A1 ON PARTS USED FOR FOR MACHINING AND INSPECTION COMMONLY USED ON RIGID PARTS LIKE CASTINGS AND FORGINGS AND NON-RIGID PARTS MADE FROM PLASTIC, RUBBER, OR SHEET METAL.
PROFILE OF A LINE
PROFILE OF A SURFACE
A
RUNOUT
CONCENTRIC CIRCLES A .004 APART
A
CIRCULAR RUNOUT
.004 A
TWO CONCENTRIC CYLINDERS A .004 APART
A
TOTAL RUNOUT .250
.004
B RESTRICTED MOVEMENT
.014 ZONE AT MMC
.380
.620
POSITION A
.620 C
B
PARALLEL LINES
.005 M
TERTIARY DATUM (ONE POINT MIN) SECONDARY DATUM (TWO POINTS MIN)
MODIFIER FOR THE STATED TOLERANCE NO
NO
D
NO
B
DOES NOT APPLY
NO
NO
E
STATED TOLERANCE
M OR
L
M OR
YES IF
G H
YES IF YES
J A D
M
G
IS STATED
H
YES IF YES
G
IS STATED
H
NO
C
J
DOES NOT APPLY
MAY BE USED OR MAY NOT
NO
RFS ALWAYS
YES
NO
B
RFS ALWAYS
YES
NO
E
YES IF
G
M
H
IS STATED
J
D E F
L
YES
EXAMPLE:
J
.500
.507 .005 M
A
D
M
MAY BE USED OR MAY NOT
CAN APPLY TO A FEATURE OF SIZE.
BONUS TOLERANCE: WHEN MMC IS SHOWN MODIFYING A PARTICULAR TOLERANCE, THE STATED TOLERANCE APPLIES ONLY WHEN THE FEATURE BEING CONTROLLED IS AT MMC. THE BONUS IS THE DIFFERENCE BETWEEN THE ACTUAL SIZE AND THE MMC SIZE AND MAY BE ADDED DIRECTLY TO THE ORIGINAL TOLERANCE.
A
DOES NOT APPLY
M OR
RELATIVE TO
D
M
L
CAN APPLY TO A FEATURE OF SIZE.
A B C
WITHIN
EXAMPLE: THE POSITION OF THE FEATURE AXIS MUST BE WITHIN A .005 TOLERANCE ZONE AT MMC RELATIVE TO DATUM FEATURES A, B, AND C.
A
IS STATED
YES
L
CAN APPLY TO A FEATURE OF SIZE.
BASIC SENTENCE STRUCTURE: WHEN USING THE ENGLISH LANGUAGE TO SAY WHAT IS IN THE FEATURE CONTROL FRAME. YOU MAY USE THE FOLLOWING CONNECTING WORDS: .005 M
ACTUAL MMC
.503 .500
BONUS
.003
AT MMC THE HOLE MUST BE POSITIONED WITHIN A CYLINDRICAL TOLERANCE ZONE OF .005 DIAMETER. AS THE EXAMPLE SHOWS, THE HOLE HAS DEPARTED FROM MMC BY .003. THE .003 BONUS TOLERANCE MAY NOW BE ADDED TO THE ORIGINAL .005 ZONE FOR A TOTAL OF .008 TOLERANCE. FUNCTIONAL GAGES: DEVICES THAT MEASURE THE COLLECTIVE EFFECTS OF SIZE AND GEOMETRIC TOLERANCES AT THE SAME TIME. IT REPRESENTS A SIMULATED MATING CONDITION. BONUS TOLERANCES AND FUNCTIONAL GAGES: DIRECTLY APPLICABLE TO ANY GEOMETRIC CHARACTERISTIC THAT IS MODIFIED BY M . SHIFT: AS A DATUM FEATURE OF SIZE, THAT IS GEOMETRICALLY CONTROLLED, DEPARTS FROM MMC, ADDITIONAL TOLERANCE MAY BE CONSIDERED FOR THE CONTROLLED FEATURES. THIS ADDITIONAL TOLERANCE DOES NOT ADD DIRECTLY TO THE ORIGINAL TOLERANCE BUT MUST BE APPLIED TO THE PATTERN OF FEATURES AS A GROUP. IT IS CONSIDERED A TOLERANCE THAT ALLOWS THE CONTROLLED FEATURES TO SHIFT AS A GROUP. VIRTUAL CONDITION: THE COLLECTIVE EFFECT OF SIZE AND GEOMETRIC TOLERANCES THAT MUST BE CONSIDERED IN DETERMINING THE FIT OR CLEARANCE BETWEEN MATING PARTS OR FEATURES. TO CALCULATE VIRTUAL CONDITION: EXTERNAL FEATURES: MMC SIZE + TOLERANCE OF FORM, ORIENTATION, OR LOCATION INTERNAL FEATURES: MMC SIZE – TOLERANCE OF FORM, ORIENTATION, OR LOCATION
.004 AROUND DATUM AXIS
.004 A
A VIRTUAL CONDITION WILL EXIST ONLY FOR TOLERANCES THAT CONTROL SIZE FEATURES.
A CONCEN– TRICITY
RFS ALWAYS
YES
NO
RFS ALWAYS
YES
NO
J
D
PARALLEL PLANES
THIS CHART IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY. THE INFORMATION IS BASED UPON ASME Y14.5M - 1994.
G H
GENIUM PUBLISHING CORP. ONE GENIUM PLAZA SCHENECTADY, NY 12304 (518) 377-8854
.004 EQUALLY DISPOSED FROM CENTER PLANE
.004 A
PARALLEL LINES
* THIS COLUMN INDICATES POSSIBLE TOLERANCE ZONES THAT MAY BE USED WITH THE VARIOUS CONTROLS. THE DIFFERENT TOLERANCE ZONES ARE SHOWN ALONG THE BOTTOM OF THIS CHART.
A
SYMMETRY
C
A B C
PRIMARY DATUM (THREE POINTS MIN)
.380
A
PARALLEL LINES
J
A
PITCH DIAMETER RULE: TOLERANCES THAT APPLY TO SCREW THREADS APPLY TO THE AXIS OF THE THREAD DERIVED FROM THE PITCH CYLINDER. IF ANOTHER PART OF THREAD IS TO BE USED TO DERIVE THE AXIS, IT MUST BE STATED BENEATH THE FEATURE CONTROL FRAME. ANY OTHER FEATURE THAT HAS A PITCH DIAMETER MUST HAVE THE DATUM FEATURE STATED.
A
IS STATED
FEATURE CONTROL FRAME:
TRUE CENTER
LOCATION
GEOMETRIC TOLERANCE RULE: GEOMETRIC TOLERANCES ARE UNDERSTOOD TO BE APPLIED RFS. IF MMC OR LMC IS REQUIRED, IT MUST BE PLACED IN THE FEATURE CONTROL FRAME. SEE MMC, LMC, OR RFS COLUMN.
H
.022 ZONE AT LMC
.014 M A B C FREE MOVEMENT
LIMITS OF SIZE RULE: WHERE ONLY A SIZE DIMENSION IS GIVEN. a) THE SIZE DIMENSIONS AT ANY CROSS SECTION MUST BE WITHIN THE SIZE TOLERANCE. b) THE SURFACE(S) SHALL NOT EXTEND BEYOND THE PERFECT FORM DEFINED BY THE MMC SIZE. c) THE FORM MAY VARY WITHIN AN ENVELOPE BETWEEN THE MMC AND LMC.
M
NO
NO
CAN APPLY TO A FEATURE OF SIZE.
TWO PLANES .004 APART ALONG TRUE PROFILE A
.004 A
.004 A DATUM REFERENCE FRAME: (THREE PLANE CONCEPT). THE CONCEPT OF USING MUTUALLY PERPENDICULAR FEATURES OF A PART TO CONTROL ITS FREE MOVEMENT IN SPACE (DEGREES OF FREEDOM). SEE DATUM SYMBOL AND DATUM TARGETS.
A
DOES NOT APPLY
M OR
TWO LINES .004 APART ALONG TRUE PROFILE
.004
PROFILE
TOLERANCE ZONES: ALL TOLERANCE ZONES SHOWN IN THE FEATURE CONTROL FRAME ARE TOTAL. EXAMPLE: FLATNESS WITHIN .004 MEANS THAT TWO PARALLEL PLANES NO MORE THAN .004 APART DEFINE THE TOLERANCE ZONE.
YES IF
GEOMETRIC CHARACTERISTIC SYMBOL
TWO CONCEN– TRIC CIRCLES .004 APART
.005 .004
– FREE STATE: THIS SYMBOL INDICATES F THE PARTS MUST NOT BE RESTRICTED DURING INSPECTION.
TOLER ZONE TYPE
DIAMETER SYMBOL (CYLINDRICAL TOLERANCE ZONE)
CIRCULARITY
ST – STATISTICAL TOLERANCE: A TOLERANCE FOR A PART OF AN ASSEMBLY BASED ON THE RESULTS FROM A STATISTICAL CALCULATION. THE DESIRED RESULT IS LARGER TOLERANCES.
– BASIC DIMENSION: THESE DIMENSIONS HAVE NO TOLERANCE. THEY ONLY LOCATE A TOLERANCE ZONE.
DOES NOT APPLY
FACTS TO
FUNC GAGE USED
DATUM USED
L
CAN APPLY TO A FEATURE OF SIZE.
TWO PARALLEL PLANES, .004 APART
.004
– PROJECTED TOLERANCE ZONE: WHEN THE SYMBOL IS SHOWN, IT MEANS THE STATED TOLERANCE ZONE IS EXTENDED BEYOND THE SURFACE OF THE PART, NOT WITHIN THE PART.
– DATUM SYMBOL: THIS SYMBOL IS ATTACHED TO A PLANE OR SIZE FEATURE THAT MUST BE ED FOR MACHINING AND INSPECTION.
M OR
FLATNESS
P
A
MMC LMC OR RFS
TWO PARALLEL LINES .004 APART
.005 .004
– LMC – LEAST MATERIAL CONDITION: L THAT CONDITION WHERE A FEATURE OF SIZE CONTAINS THE LEAST AMOUNT OF MATERIAL WITHIN THE STATED LIMITS OF SIZE. EXAMPLE: MAXIMUM HOLE SIZE AND MINIMUM SHAFT SIZE. RFS – REGARDLESS OF FEATURE SIZE: THIS IS THE DEFAULT CONDITION FOR ALL GEOMETRIC TOLERANCES. NO BONUS TOLERANCES ARE ALLOWED. FUNCTIONAL GAGES MAY NOT BE USED.
AS SHOWN ON DRAWING
SYMBOL
E
PARALLEL PLANES
F
PARALLEL PLANES
G
PARALLEL PLANES
H
PARALLEL PLANES
J
CYLINDER ZONE
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