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Bolts: Aerospace Bolt Interchange

 

The following charts detail material specifications, strength and temperature ratings, nominal thread lengths and updates/

interchanges of the most commonly used aerospace bolt series.

 

Hex Head
125,000 psi tensile / 75,000 psi shear
AN3: Alloy steel, 450°F
AN3C: Stainless steel, 450°F

160,000 psi tensile / 95,000 psi shear

NAS 1103: Alloy steel, 450°F

NAS6303: A286 Stainless,1200°F

NAS6203: Alloy steel, 450°F

NAS653: Titanium Alloy, 500°F

NAS1303: Alloy steel, 450°F

NAS673: Titanium Alloy, 500°F

NAS6603: Alloy steel, 450°F

NAS6403: Titanium Alloy, 500°F

Thread sizes and nominal thread lengths above series (Thread lengths in decimal inches)

BOLT SERIES
Bolt Dia
Dash No.
Thread
Size
1103 6203
1303 6603

6303
653 673 6403

AN3
3 .190-32 .276 .323   .338   .345 .323 .276 .338 .323   .406
4 .250-28 .316 .370   .425   .425 .370 .316 .425 .370   .469
5 .3125-24 .375 .438   .469   .469 .438 .375 .469 .438   .531
6 .375-24 .391 .454   .578   .578 .454 .391 .578 .454   .641
7 .4375-20 .453 .528   .594   .694 .528 .453 .594 .528   .656
8 .500-20 .453 .528   .735   .735 .528 .453 .735 .528   .781
9 .563-18 .511 .594   .840   .840 .594 - - .594   .906
10 .625-18 .543 .626   .902   .902 .626 - - .626   .953
12 .750-16 .572 .666 1.041 1.041 .666 - - .666 1.093

Supersedence

Commonly Accepted Interchanges

 

NAS1103 to NAS6203

 

NAS1103 and NAS6203

 

NAS1303 to NAS6603

 

NAS1303 and NAS6603
 

 

12 Point Head/Internal Wrenching Head

160,000 psi tensile/96,000 psi shear

180,000 psi tensile/108,000 psi shear

NAS144: Alloy steel, 450°F(internal wrenching)

NAS624: Alloy steel, 450°F (12 point)

MS20004: Alloy steel, 450°F(internal wrenching)

MS21250 Alloy steel, 450°F (12 point)
   

 

Thread sizes and nominal thread lengths above series (Thread lengths in decimal inches)

BOLT SERIES

BOLT DIA

DASH NO.

THREAD

SIZE

NAS

144

MS

20004

NAS

624

MS

21250
3 .190-32   N/A   N/A N/A   .420
4 .250-28   .500   .475 .485   .492
5 .3125-24   .563   .537 .572   .579
6 .375-24   .688   .662 .619   .625
7 .4375-20   .813   .787 .694   .721
8 .500-20   .813   .787 .741   .768
9 .563-18   .875   .850 .826   .852
10 .625-18   .938   .912 .873   .899
12 .750-16 1.063 1.037 .993 1.03

Supersedence

Commonly Accepted Interchanges

NAS144 to MS20004

NAS624 and MS21250

NAS144 and MS20004