Jo-Bolt
generic-NAS · Hex-drive blind bolt
Threaded hex-drive blind bolt — repeatable clamp load, vibration-proof.
aka NAS1750 · NAS1751 · NAS1669 · blind bolt (threaded)
Schematic cross-section, not to scale. Orange = hex drive + large blind-side upset.
Shear
75–95 ksi
Blind bulb
large
Max service
≤ 900°F
Lead-time risk
Medium
Diameters
3/16, 1/4, 5/16, 3/8"
Head styles
- Protruding
- 100° flush
Standards
- NAS1669
- NAS1750
- NAS1751
Materials & galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes |
|---|---|---|---|
| Alloy steel | 75 ksi | med | — |
| A286 CRES | 90 ksi | med | — |
| Titanium (Ti-6Al-4V) | 90 ksi | low | — |
Install tooling & training
- Tool
- Torque wrench + special socket/holder
- Special / proprietary
- Special tooling
- Training
- Torque control critical for preload.
- Inspection
- Torque verification; protrusion.
Three-piece threaded assembly: rotating the bolt against the nut expands a stainless sleeve into the blind-side head; install torque directly sets clamp load (repeatable).
Sourcing
Lead-time risk: Medium
- Peerless Aerospace Fastener ↗
Largest dedicated aerospace fastener inventory; approved source for major OEMs + DoD; multi-year fixed pricing, bonded storage, designated hold-shelf, min/max + safety-stock programs.
- Boeing Distribution (Aviall / KLX) ↗
Formed from Aviall + KLX; broadest catalog coverage for OEM/MRO/airline; deep stock on commodity NAS/MS hardware.
- Incora ↗
Authorized distributor for 60+ manufacturers; AS9100 / EN9120 / FAA AC 00-56; strong vendor-managed-inventory (VMI) and kitting programs.
Need a price or lead time?
Build a spec-complete RFQ and send it to distributors who stock Jo-Bolt.
Strengths
- +Torque-controlled, repeatable clamp load
- +Strong vibration resistance (threaded engagement)
- +Flush-millable variant available
Trade-offs
- −Not composite-specific — verify bearing on composite
- −Slower install than a pull rivet
Typical applications
- · Vibration-critical structural blind joints
- · Controlled, repeatable clamp load
- · Flush-millable (FA) variant for aero surfaces