NAS Bolts – Aerospace Bolts Interchange

Jet-Tek is a manufacturer and distributor of NAS Bolts. Blanks in all diameters available which can be completed in 2-3 weeks based on your requirement. Parts include Manufacturer and material certifications with chemical and physical test reports at no charge. Contact us at (800) 804-7876 for a free quote, or please submit a RFQ here.
NAS Bolts Series
NAS6203 – NAS6210
NAS6303 – NAS6310
NAS6603 – NAS6610
NAS6703 – NAS6710

The following charts detail material specifications, strength and temperature ratings, nominal thread lengths, and updates/interchanges of the most commonly used aerospace bolt series.

NAS Bolts – Hex Head

125,000 Dsi tensile / 75,000 Dsi shear
AN3: alloy steel, 450°F
AN3C: stainless steel, 450°F

160,000 Dsi tensile/ 95,000 psi shear
NAS1103: Alloy steel, 450°F NAS6703: 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
NAS6303: A286 stainless, 1200°F NAS6803: Titanium alloy, 500°F

Supersedence Commonly Accepted Interchanges
NAS1103 to NAS6203 NAS1103, NAS6203
NAS1303 to NAS6603 NAS1303, NAS6603

NAS Bolts – Internal Wrenching Head – 12 Point 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)
Supersedence Commonly Accepted Interchanges
NAS144 to MS20004 NAS624 and MS21250
NAS144 and MS20004

Thread Sizes and Nominal Thread Lengths Chart

Note: “x” or “xx” represents diameter number; all dimensions are in inches

Dia. Number

Thread Size

Alloy Steel

A286 Stainless

6AL4v Titanium Alloy

Alloy Steel

11xx

62xx

13xx

66xx

63xx

67xx

65xx

67xx

64xx

68xx

ANx

MS2000x

MS21250

NAS62x

3

.190-32

.276

.323

.338

.345

.323

.345

.276

.338

.323

.345

.406

N/A

.420

N/A

4

.250-28

.316

.370

.425

.425

.370

.425

.316

.425

.370

.425

.469

.475

.492

.485

5

.3125-24

.375

.438

.469

.469

.438

.469

.375

.469

.438

.469

.531

.537

.579

.572

6

.375-24

.391

.454

.578

.578

.454

.578

.391

.578

.454

.578

.641

.662

.625

.619

7

.4375-20

.453

.528

.594

.694

.528

.694

.453

.594

.528

.694

.656

.787

.721

.694

8

.500-20

.453

.528

.735

.735

.528

.735

.453

.735

.528

.735

.781

.787

.768

.741

9

.563-18

.511

.594

.840

.840

.594

.840

.594

.840

.906

.850

.852

.826

10

.625-18

.543

.626

.902

.902

.626

.902

.626

.902

.953

.912

.899

.873

12

.750-16

.572

.666

1.041

1.041

.666

1.041

.666

1.041

1.093

1.037

1.036

.993

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