“M” rivet ( double dimple monel steel)

((BR + MT) x K)

turn tap one full turn clock wise, then one HALF turn counter clockwise

“DD” rivet 2024

universal = 2d-4d countersunk =2.5d-4d

equals the bend radius “measured from BTL under the break”

the distance between rivets (center - center)

unified national coarse

Taper Taps – tapered from the end, used to start a thread easily Plug Taps – Most common Bottoming Taps – used for cutting threads to the bottom of a blind hole

provides a smooth free running thread

B Rivet ( 5056 aluminum)

5/32

NE

unified national fine

Tap; used to cut internal threads Die; create external threads

3/16”

AD rivet

A rivet (1100 aluminum)

dimensions lines on a drawing

the distance from the mold point to the bend tangent line

shows fastener length W = spot weld alternate (not used in aviation) 5W = length is dash 5 or can be spot welded

bend allowance “how much material is taken up in the bend. measurement between the BTL’s

SE

D= dimple C= countersink D3C = 4 sheets of metal total, dimple 3, countersink 1

bend tangent line “indicate start end of the bend”

1/2 major diameter 13 threads per inch

to find height; 3 divided by 32 = 0.09375 multiplied by (height .5) = 0.047 height take height 0.047 and multiple by 3 for the buck tail width. 0.047 x 3 = .141 Bucktail width

provides self locking torque

“D” rivet (2017 aluminum)

1. thickness 2. temper 3. grain direction

3/32

fastener diameter. N = near F = far no letter = head can be either side

where mold lines / dimension lines interact

the point in the sheet that is neither stretched or compressed, located 44.53% from inside the bend

MT + ((1.5D))

1/8”