Hi-Lite
LISI · Lockbolt / pin-collar
Titanium fatigue pin for composite — lighter Hi-Lok, when both sides are reachable.
aka HiLite · Hi Lite
Schematic cross-section, not to scale. Orange = the swaged collar (needs both-side access).
Shear
90–95 ksi
Blind bulb
n/a
Max service
≤ 900°F
Lead-time risk
Medium
Diameters
5/32, 3/16, 1/4, 5/16, 3/8"
Head styles
- Protruding
- 100° flush
Standards
- NAS (Hi-Lite series)
Materials & galvanic compatibility vs CFRP
| Alloy | Shear | vs CFRP | Notes |
|---|---|---|---|
| Titanium (Ti-6Al-4V) | 95 ksi | low | Ti-6Al-4V, primary |
| A286 CRES | 95 ksi | med | — |
Install tooling & training
- Tool
- Hex key + collar wrench
- Special / proprietary
- Standard tooling
- Training
- Standard.
- Inspection
- Collar break-off; protrusion gauge.
Shorter thread form than Hi-Lok for ~15% weight saving at equal shear; recess designed for clearance-fit composite assemblies. Collars not back-compatible with Hi-Lok.
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.
- Würth Aerospace ↗
Modern EU logistics center, DIN EN 9120 certified; fasteners plus auxiliary/operating materials; strong for European programs (Airbus ecosystem).
Need a price or lead time?
Build a spec-complete RFQ and send it to distributors who stock Hi-Lite.
Strengths
- +Titanium — galvanically compatible with CFRP
- +~15% lighter than Hi-Lok at equal shear
- +Composite-clearance recess
Trade-offs
- −Needs access to BOTH sides (not blind)
- −Lower clamp force than Hi-Lok; collars not interchangeable
Typical applications
- · Weight-critical, fatigue-critical primary structure
- · Composite structure (clearance-fit recess) with two-side access