Types of Rivet Guns
Impact Rivet Guns
Impact rivet guns deliver repeated blows via a pneumatic or electric hammer to deform the tails of solid rivets, providing high-impulse forces that upset and work-harden the material for a secure joint.[28] This hammering action requires access to both sides of the workpiece, with a bucking bar—a heavy, shaped metal tool—held firmly against the rivet tail to counter the impacts while the gun strikes the head.[8] The process is ideal for accessible applications in industries like aerospace and automotive assembly, where solid rivets ensure durable, vibration-resistant connections.
These tools excel in generating substantial force for setting large-diameter rivets, accommodating sizes up to 3/8 inch in aluminum and 5/16 inch in steel, which manual methods cannot efficiently handle.[29] In high-volume production environments, impact rivet guns offer cost-effectiveness through rapid cycle times and simple operation, enabling thousands of installations per shift without complex setups.[30] Their robust design also supports consistent quality in demanding structural applications.
However, impact rivet guns produce significant noise levels that often exceed occupational exposure limits, necessitating hearing protection and potentially limiting use in enclosed spaces.[31] They typically require two operators—one to wield the gun and another to manage the bucking bar—or dedicated fixtures to maintain alignment, increasing labor demands compared to single-sided tools.[8] Additionally, their reliance on opposite-side access makes them unsuitable for blind riveting scenarios where the bucking bar cannot be applied.
Typical specifications include operating pressures of 90-120 PSI to achieve optimal blow force, with heavier-duty models delivering over 10 kN of riveting force.[8] Interchangeable cup sets, functioning as specialized anvils, are essential accessories; these are contoured for specific head styles, such as cupped shapes for universal (AN470) heads or dimpled profiles for flush (AN426) heads, ensuring precise deformation without marring the surface.[32]
Slow-Hitting Rivet Guns
Slow-hitting rivet guns are pneumatic tools designed to deliver controlled, repeated blows at a lower rate, typically ranging from 900 to 2,500 blows per minute (BPM), allowing operators to maintain precision during riveting operations.[33] These guns operate using compressed air to drive a reciprocating piston or hammer mechanism, with adjustable air pressure—often set between 40 and 60 PSI—regulating the speed and force of the piston strokes to produce slower, heavier impacts that minimize vibration and material deformation.[8][34] The slower stroke rate enables better trigger control, ensuring each blow is deliberate and aligned, which is essential for forming rivets without overstressing the workpiece.[35]
In applications within impact riveting, slow-hitting guns are particularly suited for precision work on thinner or softer materials, such as aluminum aircraft skins, where excessive force could cause dimpling or distortion of the surface.[36] They excel in airframe assembly and repair, driving solid shank rivets in conjunction with a bucking bar to upset the rivet tail while preserving the integrity of delicate panels, as seen in fuselage and wing construction.[37] This controlled impact also finds use in automotive panel work, where maintaining smooth finishes on thin sheet metal is critical to avoid cosmetic defects.[33]
Design features of slow-hitting rivet guns emphasize ergonomics and functionality for extended use, with weights typically between 2 and 4 pounds to reduce operator fatigue during prolonged sessions.[38] They incorporate longer stroke lengths, often 1 to 2 inches, to provide deeper reach into confined spaces for effective rivet setting.[33] Many models include rubberized grips to dampen vibration and improve handling, along with pistol-grip or offset handles for better maneuverability, and barrels stamped with capacity ratings for compatible rivet sizes made from heat-treated carbon tool steel.[37][39]
These tools were popularized in the 1940s during aviation's expansion in World War II, becoming a staple for flush riveting in aircraft production without requiring specialized equipment, as pneumatic hammers offered reliable control over manual methods.[37]
Fast-Hitting Rivet Guns
Fast-hitting rivet guns employ a pneumatic mechanism that utilizes compressed air at 90-100 PSI to drive a piston through short, rapid cycles, delivering multiple lightweight blows at rates up to 3,000 per minute to upset and set rivets in as little as 1-2 seconds.[40] This high-frequency impact contrasts with slower variants by prioritizing volume of strikes over individual force, enabling efficient deformation of the rivet tail when paired with a bucking bar on the opposite side.[40]
These tools excel in heavy-duty environments like structural steel framing, shipbuilding, and machinery assembly, where rapid installation outweighs the need for meticulous control to prevent material distortion.[40] In shipbuilding, for instance, they facilitate the swift joining of steel plates in hull construction during large-scale projects.[41]
Key design elements include a robust build weighing 5-10 pounds for enhanced stability under sustained high-speed operation, options for straight or pistol-grip handles to reduce operator fatigue, and interchangeable dimpling cups that conform the rivet head for flush or countersunk finishes in demanding assemblies.[42] The heavier frame absorbs recoil effectively, while ergonomic grips support prolonged use in industrial settings.
In terms of performance, these rivet guns accommodate up to 1/4-inch diameter rivets in tough materials such as steel, requiring an air compressor with 5-10 CFM capacity to sustain the rapid piston action without pressure drops.[42]
Corner Riveters
Corner riveters are specialized impact rivet guns designed for setting rivets in confined, angled, or hard-to-reach spaces where standard tools cannot access effectively. These tools feature a right-angle or 90-degree offset head that allows the riveting action to occur perpendicular to the main body, enabling precise work in corners, edges, or tight enclosures. Unlike conventional rivet guns, corner riveters prioritize maneuverability over high-speed operation, often incorporating a compact design with lengths as short as 4 inches to fit into restricted areas.[43][44]
The design adaptations of corner riveters include an extended or offset nosepiece, typically at a 90-degree angle, which provides reach into awkward positions, with some models supporting extensions up to 8-12 inches for greater accessibility. Many incorporate a swiveling head that rotates 360 degrees for enhanced flexibility in confined environments, and they utilize short shank rivet sets to maintain stability during operation. This configuration is often based on a slow-hitting impact style, controlled by a teasing throttle that allows gradual force application to prevent slippage in precarious spots. The mechanism relies on pneumatic impact action, delivering blows at rates of 2,700-2,850 per minute with operating pressures around 90 PSI, generating force comparable to a standard 3X rivet gun while emphasizing precision over raw power.[44][45][46][47]
These tools find unique applications in scenarios requiring rivet installation without straight-line access, such as furniture assembly where joints in frames or upholstery demand angled fastening, HVAC ductwork for securing seams in ventilation systems, and cabinetry for joining sheet metal components in enclosed assemblies. In these contexts, corner riveters ensure secure, flush connections that withstand environmental stresses without compromising structural integrity. Accessories like interchangeable extensions, flush rivet sets, and specialized nosepieces allow customization for specific angles and rivet sizes, enhancing versatility across materials like aluminum and steel up to 3/16-inch capacity.[44][48][49][50][51]