Radial-Lok
Monogram · Blind bolt
Fatigue-first blind bolt — fills the hole 360° and forgives loose holes.
aka RadialLok
Schematic cross-section, not to scale. Orange = the large blind-side upset; high clamp-up.
Shear
75–95 ksi
Blind bulb
large
Max service
≤ 900°F
Lead-time risk
High
Diameters
3/16, 1/4, 5/16, 3/8"
Head styles
- Protruding
- 100° flush
Standards
- NAS (Radial-Lok series)
Materials & galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes |
|---|---|---|---|
| Titanium (Ti-6Al-4V) | 90 ksi | low | — |
| A286 CRES | 95 ksi | med | — |
Install tooling & training
- Tool
- Monogram installation tool
- Special / proprietary
- Special tooling · proprietary
- Training
- Specialty.
- Inspection
- Pintail break; protrusion.
360° radial expansion (.002–.006 in) uniform along the full grip increases fatigue life; tolerant of a loose .003 in hole — no costly close-tolerance prep.
Sourcing
Lead-time risk: High
- 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.
- 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 Radial-Lok.
Strengths
- +Excellent fatigue life (radial expansion)
- +Tolerant of loose hole tolerance
- +Direct blind replacement for pin-and-collar
Trade-offs
- −Specialty tooling
- −Long lead times
Typical applications
- · Fatigue-critical joints under cyclic loading
- · Pin-and-collar (Hi-Lok) replacement where blind install needed
- · Aluminum and composite structure