When is the tolerance of a counterbore incorrect?
When is the tolerance of a counterbore incorrect?
If the counterbore is machined at the max inclination WRT the hole and the part doesn’t work, then the tolerance is incorrect. 5. An alternative is to use the example in FIG 5-38 and tolerance the counterbore tighter than the through hole. Notes are never an option when there is a geometric tolerance available.
How tall is the head of a counterbore?
screw screw cap head cap head socket clearance c’bore clearance c’bore c’bore screw size dia. dia. (max) height (max) size dia. (close) dia. (close) dia. (free) dia. (free) depth size d d h d’ d’ d’ d’ h’ in mm in mm in mm in mm in mm in mm in mm in m 2 0.079 3.8 0.150 2.0 0.079 1.5 mm 2.2 0.087 4.0 0.157 2.50 0.098 4.30 0.169 2.5 0.098 m 2
Is the counterbore tighter than the through hole?
An alternative is to use the example in FIG 5-38 and tolerance the counterbore tighter than the through hole. Notes are never an option when there is a geometric tolerance available. Opinions are the reason that standards were created; to remove the error in interpretation.
Why do you need counterbore size for socket head cap screws?
Countersinks or corner reliefs in excess of this diameter reduce the effective bearing area and introduce the possibility of imbedment where the parts to be fastened are softer than the screws or brinnelling or flaring of the heads of the screws where the parts to be fastened are harder than the screws. 2. Close Fit.
How big is an inch in counterbore depth?
010 0.005 M 4 X .70 M 12 X 1.75 M 30 X 3.5 COUNTERBORE DEPTH 0.010 0.010 M 5 X .80 M 14 X 2.0 METRIC COUNTERBORE D H d D’ H’ d’ 11/4/2015 Printed copies of Electroimpact standards are for reference only and are not subject to revision control.
Countersinks or corner reliefs in excess of this diameter reduce the effective bearing area and introduce the possibility of imbedment where the parts to be fastened are softer than the screws or brinnelling or flaring of the heads of the screws where the parts to be fastened are harder than the screws. 2. Close Fit.
How big is an inch standard counterbore thread?
THREAD PITCHES SHOULD ALWAYS BE SPECIFIED, BUT WHEN METRIC THREADS ARE SPECIFIED WITHOUT A PITCH, THE FOLLOWING PITCHES ARE TO BE USED: M 2 X .40 M 5 X.80 M 12 X 1.75 M 24 X 3.0 M 2.5 X .45 M 6 X 1.0 M 14 X 2.0 M 30 X 3.5 M 3 X .50 M 8 X 1.25 M 16 X 2.0 M 4 X .70 M 10 X 1.5 M 20 X 2.5 16.8 21.0 25.0 COUNTERSINK DIAMETER D’ 4.2 5.2 7.0
What are the tolerances for inch standard countersink?
ACTUAL DEPTH MAY VARY DEPENDING ON ACTUAL HEAD DIAMETER AND ANGLE COUNTERSINK DIAMETER TOLERANCES ARE +/- .010 COUNTERSINK ANGLE TOLERANCES ARE +/- 2 DEGREES FREE SHOULD BE USED UNLESS CLOSE IS REQUIRED INCH STANDARD COUNTERSINK D d 82° D’ d’ H Printed copies of Electroimpact standards are for reference only and are not subject to revision control.
