Semi tubular rivets are permanent fasteners designed for controlled deformation during installation. A partial bore in the tail end of the shank reduces the amount of material displaced during setting, typically requiring significantly less installation force than a fully solid rivet of comparable diameter.
This lower forming force supports reduced stress on thin or sensitive materials, consistent tail formation in automated equipment, lower tooling wear across extended production runs, and improved repeatability in high-volume assembly environments.
G-Fast supplies semi tubular rivets through qualified domestic and global sources and supports specification verification and production blanket programs.
Installation Characteristics and Joint Behavior
The defining characteristic of a semi tubular rivet is the controlled roll-out of the hollow tail during setting. Because only the tubular portion deforms, installation force remains predictable and concentrated in the clinch area rather than across the full shank cross-section.
Properly specified semi tubular rivets provide stable mechanical retention, consistent clinch geometry, reduced distortion of mating components, and permanent non-removable joints when correctly formed.
Supply & Fulfillment Options
- Production blanket orders and scheduled releases
- Specification review prior to order placement
Request a Quote
Provide the following for accurate pricing and lead time:
- Existing part number (if applicable) with print or drawing reference
- Diameter and shank length
- Head style
- Material and finish
- Estimated annual usage
- Print or sample
G-Fast supports semi tubular rivet sourcing with disciplined specification review, supply continuity planning, and competitive lead times.
Head Style Options
| Head Style |
Typical Application |
Key Consideration |
| Round / Universal |
General hardware and hinge assemblies |
Protruding head - verify clearance |
| Flat / Countersunk |
Flush surface requirements |
Requires proper countersink preparation |
| Oval |
Appearance-sensitive applications |
Moderate bearing surface |
| Truss |
Thin sheet or soft material layers |
Wider bearing area |
| Pan |
Automated high-volume assembly |
Consistent bearing surface |
Material Options
Semi tubular rivets are commonly produced in the following materials:
- Low Carbon Steel (plain or zinc plated)
- 260 Brass (plain or plated)
- 302 Stainless Steel (passivated and waxed)
- 410 Stainless Steel
- 5056 Aluminum
Material selection should reflect environmental exposure, required strength and hardness, base material compatibility, electrical considerations, and appearance requirements.
Diameter and Shank Length Capabilities
Semi tubular rivets are available in diameters ranging from 0.060 inch through 0.250 inch (1/16 inch to 1/4 inch nominal).
Maximum shank length depends on diameter, material, and forming limitations. In general, larger diameters support proportionally longer shanks, with maximum lengths extending up to approximately 2-1/8 inches in larger sizes.
Not all diameter and length combinations are manufacturable. Extremely small diameters cannot be produced at extended lengths due to forming stability constraints. Stainless steel configurations may also have different practical limits compared to low carbon steel or brass.
