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OSI-Bolt
Monogram · Blind bolt
Composite-optimizedOne-side install
Blind bolt with solid-bolt bearing — when you can't get to the back side.
aka OSI Bolt · 1.5D blind bolt
Schematic cross-section, not to scale. Orange = the large blind-side upset; high clamp-up.
Shear
85–95 ksi
Blind bulb
large
Max service
≤ 900°F
Lead-time risk
High
Diameters
1/4, 5/16, 3/8"
Head styles
- Protruding
- 100° flush
Standards
- NAS (OSI-Bolt series)
Materials & galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes |
|---|---|---|---|
| Titanium (Ti-6Al-4V) | 95 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.
Only blind bolt offering full 1.5D bearing area equivalent to a solid bolt — closes the strength gap between blind and solid fasteners.
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.
Need a price or lead time?
Build a spec-complete RFQ and send it to distributors who stock OSI-Bolt.
Strengths
- +Solid-bolt-equivalent 1.5D bearing
- +One-sided install of a near-solid-strength joint
Trade-offs
- −Specialty tooling
- −Limited stocking / long lead
Typical applications
- · Blind replacement for solid pin-and-collar bolts
- · High-bearing structural joints with one-side access