Product Parameters
| Item | Specification |
|---|---|
| Material | Alloy Steel (4330, 4340), Stainless Steel (316), Titanium (Ti-6Al-4V) |
| Specification | ASNA, NAS, AN standards |
| Thread | Metric, Unified |
| Application | Commercial aircraft, military aircraft, space systems |
| Surface | Cadmium plated, zinc-nickel, passivated |
| MOQ | 10 pcs |
description
Aerospace Hi-Lok bolts are the extended-race fasteners used in aircraft structure and primary structure - the Hi-Lok design features an external hex that allows installation with standard tools, while the internal socket head provides a flush profile. The extended thread end allows the installation of a Hi-Lok nut on the far side of the joint. The Hi-Lok fastener system was developed to address the limitations of rivets and standard bolts in aerospace applications - the Hi-Lok provides the high clamping force of a bolt with the installation efficiency of a single-piece fastener. The nut is installed from the far side, then the Hi-Lok head is torqued from the near side until the nut rotates off, indicating proper preload.
The Nut-Rotates-Off Installation Method
You install the Hi-Lok nut on the far side of the joint - no access needed to that side after installation. Then you apply torque to the external hex on the near side. The internal socket drives the bolt through the nut. When the bolt head contacts the material surface, further torque causes the nut to twist off at the designed break point. The twist-off is the visual and tactile confirmation that the designed clamp load has been achieved. This is why Hi-Loks do not require torque measurement - the break-off is the indicator.
FAQ
Q1: MOQ?
A1: 10 pieces for aerospace fastener production.
Q2: Materials?
A2: 4330, 4340 alloy steel. 316 stainless. Ti-6Al-4V titanium.
Q3: Specifications?
A3: ASNA, NAS, AN standards. Full traceability and material test reports.
Q4: Surface treatment?
A4: Cadmium plating (standard for aerospace). Zinc-nickel, passivated for alternatives.
Q5: Installation?
A5: Hex head torqued until nut rotates off - indicates proper preload achievement.
Q6: Custom configurations?
A6: Yes. Custom lengths, materials, flange configurations.
Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.
- AS/EN/JISQ 9100 - Aerospace quality management for flight-critical and structural parts
- NADCAP - Accredited special processes including heat treatment, NDT, and surface treatment
- DFARS / ITAR - Compliant supply chain for defense and space applications
- Boeing DMS / Airbus SP - Customer-specific requirements documentation available
- Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
- Material Traceability - Heat number tracking from raw material to finished part
From raw material to finished product, every step is controlled and documented:
- Wire / Bar Preparation - Cold heading or CNC blanking to near-net shape
- Thread Rolling / Cutting - Thread rolling for rolled threads or die cutting for cut threads
- Heat Treatment - Case-hardening or through-hardening for strength requirement
- Surface Treatment - Plating, coating, or passivation as specified
- Final Inspection - Dimensional check, torque testing, and surface inspection
- Packaging - Bulk bag, polybag, or plastic tub with labeling and traceability
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