Hi-Bulb Structural Blind Rivet Technical Datasheet
Product Overview
The Hi-Bulb Structural Blind Rivet, commonly referred to in the industry as Unigrip blind rivet, is a high-strength blind fastening solution designed for applications requiring excellent hole-filling capability, superior vibration resistance, and installation in materials with varying thicknesses. The unique expanding bulb formation on the blind side provides a large bearing area, making these rivets particularly suitable for thin sheet materials, oversized holes, and applications requiring enhanced pull-out resistance.
Horizon Inc.’s Hi-Bulb Structural Blind Rivets are available in both Steel-Steel and Stainless Steel-Stainless Steel constructions, offering reliable performance across industrial, transportation, electrical enclosure, HVAC, fabrication, and construction applications.
ITEM CODE: 4024
Standards – Dimensions Conform to
| Steel / Steel | ISO 15979 |
| St Steel / St Steel | ISO 15983 |
Dimensions
| d (nom) | 3.2 | 4 | 4.8 | 6.4 |
| d (max) | 3.28 | 4.08 | 4.88 | 6.48 |
| d (min) | 3.05 | 3.85 | 4.65 | 6.25 |
| dk (max) | 6.7 | 8.4 | 10.1 | 13.4 |
| dk (min) | 5.8 | 6.9 | 8.3 | 11.6 |
| k | 1.3 | 1.7 | 2 | 2.7 |
| dm (max) | 2 | 2.45 | 2.95 | 3.9 |
| p (min) | 25 | 27 | 27 | 27 |
| b | lmax + 4 | lmax + 4 | lmax + 4.5 | lmax + 5.5 |
| Hole diameter | 3.3-3.4 | 4.1-4.2 | 4.9-5 | 6.5-6.6 |
all dimensions in mm
Mechanical Properties
Steel Body / Steel Mandrel
| d | 3.2 | 4 | 4.8 | 6.4 |
| Tensile Strength – (Min) | 1200 N | 2000 N | 2900 N | 5400 N |
| Shear Strength – (Min) | 1200 N | 2400 N | 4200 N | 11000 N |
Stainless Steel Body / Stainless Steel Mandrel
| d | 3.2 | 4 | 4.8 | 6.4 |
| Tensile Strength – (Min) | 2000 N | 3500 N | 4500 N | 8300 N |
| Shear Strength – (Min) | 1600 N | 4000 N | 5500 N | 13700 N |
The mechanical values shown are nominal minimum values intended for design guidance only and do not constitute a guarantee of performance in a specific application. Users should validate suitability through application-specific testing.
Material Characteristics and Recommended Applications
| Material Combination | Characteristics | Typical Applications |
|---|---|---|
| Steel Body / Steel Mandrel | High tensile strength, economical | Sheet metal fabrication, electrical panels, HVAC, enclosures |
| Stainless Steel Body / Stainless Steel Mandrel | Excellent corrosion resistance, high strength | Outdoor equipment, transportation, marine, food processing, infrastructure |
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Structural Blind Rivet |
| Trade Name | Hi-Bulb Rivet |
| Installation Method | Blind Side Installation |
| Head Style | Dome Head |
| Body Design | High Expansion Multi-Grip |
| Body Material | Carbon Steel / A2 Stainless Steel |
| Mandrel Material | Carbon Steel / A2 Stainless Steel |
| Grip Capability | Wide Grip Range |
| Hole Filling | Excellent |
| Vibration Resistance | Excellent |
| Blind Side Formation | Large Expanding Bulb |
| Installation Tool | Standard Riveting Tool |
| Corrosion Resistance | Moderate (Steel), Excellent (A2 Stainless Steel) |
| Application Type | Structural / Semi-Structural Fastening |
Applications
Hi-Bulb Structural Blind Rivets are commonly used in:
- Electrical control panels and enclosures
- Sheet metal fabrication
- HVAC ducting systems
- Transportation equipment
- Railway interiors
- Bus and commercial vehicle bodies
- Telecommunication cabinets
- Solar mounting systems
- Signage systems
- Industrial equipment
- Agricultural machinery
- Marine equipment
- Construction and infrastructure
- General manufacturing assemblies
Advantages
- Wide grip range reduces inventory requirements.
- Excellent hole-filling capability compensates for oversized holes.
- Large blind-side bulb distributes load over a wider area.
- High resistance to vibration and loosening.
- Suitable for joining thin and brittle materials.
- Strong pull-out and shear performance.
- Single-side installation access required.
- Reduced risk of material deformation.
- Available in corrosion-resistant stainless steel construction.
- Suitable for structural and semi-structural applications.
Related Products
- Open End Blind Rivets
- Closed End Blind Rivets
- Multi-Grip Blind Rivets
- Monobolt Rivets
- Interlock Rivets
- High Strength Rivets
Frequently Asked Questions
What is a Hi-Bulb rivet?
A Hi-Bulb rivet is a structural blind rivet that forms a large expanding bulb on the blind side, providing superior hole-filling capability and enhanced pull-out resistance.
What are the advantages over standard blind rivets?
Hi-Bulb rivets offer:
* Wider grip range
* Better hole-filling capability
* Higher pull-out resistance
* Improved vibration resistance
* Better performance in thin materials
Can Hi-Bulb rivets be used in oversized holes?
Yes. Their expanding bulb design provides excellent performance in oversized or irregular holes.
Are Hi-Bulb rivets suitable for structural applications?
Yes. They are widely used in structural and semi-structural fastening applications where improved strength and reliability are required.
What tools are required for installing Hi-Bulb Rivet?
Hi-Bulb Rivets can be installed using pneumatic, battery-powered, or hydraulic blind rivet tools.
Are Hi-Bulb rivets watertight?
No. Hi-Bulb rivets are not designed as sealed or watertight fasteners. For applications requiring a watertight joint, closed-end blind rivets or additional sealing methods should be used.
Is Hi-Bulb the same as a Unigrip rivet?
Yes. Hi-Bulb is Horizon Inc.’s designation for the style of blind rivet commonly marketed by many manufacturers as a “Unigrip” rivet. The product features a large blind-side bulb formation and a wide grip range.
Technical Disclaimer
The technical information, specifications, dimensions, mechanical properties, drawings, and performance data provided on this website are intended for general reference and engineering guidance only. Values shown are representative of products manufactured under normal production conditions and may vary depending on material grade, manufacturing tolerances, installation method, application, and operating environment.
While Horizon Inc. makes every reasonable effort to ensure the accuracy of the information provided, we make no warranties, express or implied, regarding its completeness, accuracy, or suitability for any particular purpose. Customers are responsible for verifying that the selected product is appropriate for their specific application and operating conditions. Where safety, structural integrity, or regulatory compliance is critical, independent engineering evaluation and product testing should be performed.
Horizon Inc. reserves the right to modify product specifications, dimensions, materials, and technical data without prior notice.
To the fullest extent permitted by applicable law, Horizon Inc. shall not be liable for any direct, indirect, incidental, consequential, or special damages arising from the use of, or reliance upon, the information contained on this website.
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