How to choose your NAS bolt. A part number such as NAS1304-8 has two parts: the series (1304) is the thread size, and the dash number (-8) is the grip length.
1303 = 10-32 UNF (approx. 3/16")
1304 = 1/4"-28 UNF
1305 = 5/16"-24 UNF
1306 = 3/8"-24 UNF
The grip is the plain, unthreaded part of the shank. Each dash adds 1/16" (-8 = 1/2", -16 = 1"). Pick a grip equal to, or just over, the thickness of the parts you are clamping.
Total length = grip + thread length (1303: 0.338", 1304: 0.425", 1305: 0.469", 1306: 0.578"). Full size chart in the description below.
Race Rally Supplies
1300 Series NAS Bolts – Close-Tolerance Aircraft-Spec Bolts
1300 Series NAS Bolts – Close-Tolerance Aircraft-Spec Bolts
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NAS 1300 series bolts are National Aerospace Standard close-tolerance hex bolts with fine UNF threads and a dimpled head. They are rated at a minimum 160,000 psi tensile and 95,000 psi shear strength, making them a premium choice for suspension, chassis, roll cage and other high-load joints.
Example: clamping a 6mm (approx. 1/4") bracket to a 3mm (approx. 1/8") tab = 9mm, about 3/8". Pick dash -6 (3/8" grip). Add a washer if you need to take up a little extra length before the nut.
Key features
- National Aerospace Standard (NAS) close-tolerance bolts
- Minimum 160,000 psi tensile and 95,000 psi shear strength
- Fine UNF threads in four diameters, 10-32 to 3/8"
- 36 grip lengths per diameter in 1/16" steps
- Dimpled hex head
Size chart (approximate total length)
| Dash | Grip length | 1303 total | 1304 total | 1305 total | 1306 total |
|---|---|---|---|---|---|
| -1 | 1/16" | 0.401" | 0.487" | 0.531" | 0.640" |
| -2 | 1/8" | 0.463" | 0.550" | 0.594" | 0.703" |
| -3 | 3/16" | 0.526" | 0.613" | 0.656" | 0.765" |
| -4 | 1/4" | 0.588" | 0.675" | 0.719" | 0.828" |
| -5 | 5/16" | 0.651" | 0.738" | 0.781" | 0.890" |
| -6 | 3/8" | 0.713" | 0.800" | 0.844" | 0.953" |
| -7 | 7/16" | 0.776" | 0.863" | 0.906" | 1.015" |
| -8 | 1/2" | 0.838" | 0.925" | 0.969" | 1.078" |
| -9 | 9/16" | 0.901" | 0.988" | 1.031" | 1.140" |
| -10 | 5/8" | 0.963" | 1.050" | 1.094" | 1.203" |
| -11 | 11/16" | 1.026" | 1.113" | 1.156" | 1.265" |
| -12 | 3/4" | 1.088" | 1.175" | 1.219" | 1.328" |
| -13 | 13/16" | 1.151" | 1.238" | 1.281" | 1.390" |
| -14 | 7/8" | 1.213" | 1.300" | 1.344" | 1.453" |
| -15 | 15/16" | 1.276" | 1.363" | 1.406" | 1.515" |
| -16 | 1" | 1.338" | 1.425" | 1.469" | 1.578" |
| -17 | 1-1/16" | 1.401" | 1.488" | 1.531" | 1.640" |
| -18 | 1-1/8" | 1.463" | 1.550" | 1.594" | 1.703" |
| -19 | 1-3/16" | 1.526" | 1.613" | 1.656" | 1.765" |
| -20 | 1-1/4" | 1.588" | 1.675" | 1.719" | 1.828" |
| -21 | 1-5/16" | 1.651" | 1.738" | 1.781" | 1.890" |
| -22 | 1-3/8" | 1.713" | 1.800" | 1.844" | 1.953" |
| -23 | 1-7/16" | 1.776" | 1.863" | 1.906" | 2.015" |
| -24 | 1-1/2" | 1.838" | 1.925" | 1.969" | 2.078" |
| -25 | 1-9/16" | 1.901" | 1.988" | 2.031" | 2.140" |
| -26 | 1-5/8" | 1.963" | 2.050" | 2.094" | 2.203" |
| -27 | 1-11/16" | 2.026" | 2.112" | 2.156" | 2.265" |
| -28 | 1-3/4" | 2.088" | 2.175" | 2.219" | 2.328" |
| -29 | 1-13/16" | 2.151" | 2.237" | 2.281" | 2.390" |
| -30 | 1-7/8" | 2.213" | 2.300" | 2.344" | 2.453" |
| -31 | 1-15/16" | 2.276" | 2.362" | 2.406" | 2.515" |
| -32 | 2" | 2.338" | 2.425" | 2.469" | 2.578" |
| -33 | 2-1/16" | 2.401" | 2.487" | 2.531" | 2.640" |
| -34 | 2-1/8" | 2.463" | 2.550" | 2.594" | 2.703" |
| -35 | 2-3/16" | 2.526" | 2.612" | 2.656" | 2.765" |
| -36 | 2-1/4" | 2.588" | 2.675" | 2.719" | 2.828" |
What's included
- 1 x NAS bolt in your selected series and dash number. Nuts and washers are sold separately – see our AN Quality Nyloc and Lock Nuts.
Frequently asked questions
Is the price per bolt or per pack?
Per bolt. Set the quantity to the number you need.
Why is the grip length more important than the overall length?
The grip is the smooth part of the shank. On a close-tolerance bolt you want the smooth shank, not the threads, to sit in the holes, so the joint carries load on full-diameter metal. Match the grip to the thickness of the parts you are clamping.
What if my stack is between two sizes?
Go up to the next dash number and use a washer under the nut so the nut tightens on the threads, not on the end of the grip.
Can I order this if it shows as out of stock?
Yes. Items not currently in stock can still be ordered, and we will confirm the expected lead time after you order.
Still not sure which size I need?
Contact our team with the thickness of the parts and the hole size, and we will help you choose.
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