Stinger Performance Parts
Turbos, Headers, Exhaust, etc.

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'91 Turbo Mustang

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Bolt Sizes & Thread Pitch

2.3 Turbo Specific Info:
Manifold To Turbo Studs:
10mm X 1.5 x 40mm long Class 12.9 Metric Blue
Cheaper Alternative: Buy 40mm long bolts and cut the head off with a bandsaw, then grind the end a little on a fine wheel...Studs are like $3 to $4 each.  The bolts are less than $1.

Manifold To Turbo Nuts 10mm x 1.5 Class 12.9

Turbo Exhaust Housing To Exhaust Elbow Flange Studs/Bolts: 8mm x 1.25

Turbo Support Bracket Bolt 10mm x 1.5

EGR Plug For Manifold (to delete EGR) 1/2" Pipe Thread

AN Thread Sizes:
AN numbers equate tot he outside diameter (O.D.)of the tubing in 1/16" increments.  Each AN size number has it's own standard thread size which can be seen in column three of the chart below.

AN Size Tube O.D. Thread Size (diameter/pitch)
2 1/8" 5/16-24 SAE
3 3/16" 3/8-24 SAE
4 1/4" 7/16-20 SAE
5 5/16" 1/2-20 SAE
6 3/8" 9/16-18 SAE
8 1/2" 3/4-16 SAE
10 5/8" 7/8-14 SAE
12 3/4" 1-1/16-12 SAE
16 1" 1-5/16-12 SAE
20 1-1/4" 1-5/8-12 SAE
24 1-1/2" 1-7/8-12 SAE
28 1-3/4" 2-1/8-12 SAE
32 2" 2-1/2-12 SAE

NPT Thread Sizes:
With NPT you can see the correlation between the size callout and the inside diameter (I.D.)of the tube.

Pipe Thread Size Threads Per Inch Theoretical I.D. Closest AN Size
1/16" 27 1/16"  
1/8" 27 1/8" 4
1/4" 18 1/4" 6
3/8" 18 3/8" 8
1/2" 14 1/2" 10
3/4" 14 3/4" 12
1" 11-1/2 1" 16
1-1/4" 11-1/2 1-1/4" 20
1-1/2" 11-1/2 1-1/2" 24
2" 11-1/2 2" 32

 

 

 

 

 

 


 

 

 

 

 


If you have any questions about any of these parts feel free to contact me HERE 

 

© Gustafson 2002