5/16in Grommet 10pk ALL18364

OVERVIEW

When you''re building a high-performance air-cooled machine, the details often dictate the reliability of the entire build. These Allstar Performance 5/16-inch rubber grommets are an absolute necessity for any Volkswagen enthusiast who understands the harsh, high-vibration environment of a rear-engine vehicle. Whether you are routing a fresh wiring harness through the firewall of a 1967 Beetle or plumbing fuel lines through the chassis of a custom sand rail, these grommets provide the critical barrier needed to prevent metal edges from slicing through your insulation. In the world of air-cooled VWs, a single short circuit caused by a frayed wire can leave you stranded on the side of the road or, worse, lead to a catastrophic engine bay fire. By using these professional-grade grommets, you are ensuring that your electrical and fluid systems remain isolated and protected from the sharp, stamped steel panels common in vintage German engineering.

This 10-pack of ALL18364 grommets is specifically engineered to fit panels up to 1/16-inch (.062") thick, which is the standard gauge for most VW body panels, floor pans, and shroud tin. Allstar Performance is a name trusted in the racing industry, and they bring that same level of durability to these small but mighty components. The high-grade rubber compound is designed to resist the common chemicals found in a garage environment, including oil, gasoline, and cleaning solvents, ensuring they won''t dry out and crack after just one season of driving. For the perfectionist builder, these grommets offer more than just safety; they provide a clean, finished appearance that tells anyone looking at your engine bay that the job was done right. Don''t let a simple oversight like an unprotected wire ruin your weekend at the track or the local show; invest in the protection your project deserves.

FITMENT

These 5/16-inch grommets are universal in application but are highly recommended for the following air-cooled Volkswagen and off-road applications:

• Volkswagen Beetle: All years (1946-1979) for firewall, luggage area, and engine tin transitions.
• Volkswagen Karmann Ghia: All years (1956-1974) for electrical routing and headlight bucket wiring.
• Volkswagen Bus / Type 2: All years (1950-1979) for long-run wiring harnesses and instrument panel pass-throughs.
• Volkswagen Type 3 (Squareback, Fastback, Notchback): All years (1961-1973).
• Volkswagen Thing (Type 181): Perfect for rugged, exposed wiring protection on military-style builds.
• Dune Buggies & Sand Rails: Essential for protecting harnesses on fiberglass bodies or through metal tabs on tube frames.
• Custom Kit Cars: Including Bradley GT, Sterling, and Manx-style fiberglass bodies.

SPECS

• Brand: Allstar Performance
• Part Number: ALL18364
• Inside Diameter: 5/16 Inch
• Maximum Panel Thickness: 1/16 Inch (.062")
• Material: Chemical-resistant industrial rubber
• Quantity: 10 per pack
• Color: Black
• Application: Electrical wiring, vacuum lines, and small fluid hoses

PRO TIPS

Tip 1: Use a Lubricant for Easier Installation

Installing a rubber grommet into a tight-fitting hole can sometimes be a struggle, especially in cold weather when the rubber is less pliable. I always recommend using a small drop of dish soap or a dedicated rubber lubricant on the groove of the grommet before pressing it into the panel. This allows the grommet to "pop" into place without tearing the outer lip. Avoid using petroleum-based greases as they can sometimes degrade lower-quality rubbers over long periods, though these Allstar units are quite robust. A little bit of moisture or soapy water is usually all it takes to get a perfect seat every time.

Tip 2: Sizing the Hole Correctly

To get the best seal and security, you must drill the hole in your panel slightly larger than the 5/16-inch inside diameter of the grommet. While the ID is 5/16", the "groove" diameter (the part that sits inside the metal) is larger. Always measure the groove diameter with a pair of calipers before drilling your final hole. Using a step-drill bit (Uni-bit) is the best way to get a clean, burr-free hole in VW sheet metal. Once the hole is drilled, make sure to deburr the edges with a small file or sandpaper so the sharp metal doesn''t cut the rubber during installation.

Tip 3: Plan for Future Expansion

When routing wires through your VW''s firewall, it is tempting to use the smallest grommet possible for a tight fit. However, I always suggest leaving about 20% "breathing room" inside the grommet. This prevents the rubber from putting too much pressure on the wire insulation, which can lead to heat buildup in high-amperage circuits. Additionally, having a little extra space allows you to add a signal wire or a ground wire later without having to drill a completely new hole in your pristine chassis. If you have extra space, you can always seal the gap with a small dab of black RTV silicone for a weather-tight finish.