• Top Street Performance 1/4"-20 to 5/16"-18 Air Cleaner Stud Adapter - for street and performance builds
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Top Street Performance

1/4"-20 to 5/16"-18 Air Cleaner Stud Adapter

1/4"-20 to 5/16"-18 Air Cleaner Stud Adapter

SKU: SP7298

$4.95
$4.95 $5.45
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Low stock

Top Street Performance (TSP) is committed to providing high-quality performance parts while complying with emissions regulations. This product is designed for use on vehicles that comply with federal emissions regulations. It is the customer’s responsibility to verify that this part is legal for use in their state or local jurisdiction. Check with your local emissions authority before purchasing.

Product Details

Features

  • Converts 1/4"-20 to 5/16"-18 thread pitch in one adapter
  • Solves thread mismatches between air-cleaner base and top
  • Adds 1 1/4" to stack-up — factor into hood clearance
  • Does not resolve carb neck or throttle-body diameter mismatches

Description

This zinc-plated steel stud adapter converts a 1/4"-20 thread (inlet) to a 5/16"-18 thread (outlet) in a single 1 1/4" piece, designed for air-cleaner assemblies where the base and top use different stud thread sizes. It's a thread-pitch adapter only — it does not resolve carburetor neck or throttle-body diameter mismatches, which require a separate adapter plate.

Before ordering, confirm which side of your stack-up (base or top) uses which thread size, since installing this backward won't correct a mismatch. Factor the added 1 1/4" length into your overall air-cleaner stack-up height and hood clearance calculations.

Commonly used when mixing air-cleaner components from different sources or product lines that use different stud thread sizes, or in custom intake-system builds needing thread-pitch conversion.


Applications
Used when mixing air-cleaner base and top components with different stud thread sizes; suited to custom intake-system builds needing thread-pitch conversion from 1/4"-20 to 5/16"-18.

Sizing
1/4"-20 thread (inlet) to 5/16"-18 thread (outlet), 1 1/4" length.

Specs

Stud Length1 1/4"
Thread Inlet1/4"-20
Thread Outlet5/16"-18
MaterialSteel
FinishZinc Plated

Engine Fitment

COMPATIBLE WITH
Universal — 1/4"-20 (inlet) to 5/16"-18 (outlet) thread adapter, 1¼" length.

NOTES
• Thread-pitch adapter only — does not resolve carburetor neck or throttle-body diameter mismatches.
• Verify which side of the stack-up (base or top) uses which thread size before ordering.
• Factor the 1¼" added length into overall air-cleaner stack-up height and hood clearance.

COMMON VEHICLE APPLICATIONS
Mixing air-cleaner components (base/top) with different stud thread sizes
Custom intake-system builds needing thread-pitch conversion

Q&A

Does this adapter fix a carburetor neck or throttle-body size mismatch?
No. This adapter is a thread-pitch adapter only. It converts 1/4"-20 threads to 5/16"-18 threads and does not adapt differences in carburetor neck or throttle-body diameter. A separate air cleaner adapter plate is required for those applications.

Which side is 1/4"-20 and which side is 5/16"-18?
The 1/4"-20 side is the inlet, and the 5/16"-18 side is the outlet. Verify which thread size your air cleaner base and top require before installation.

How much does this add to my overall air-cleaner height?
This adapter adds 1¼ inches to the overall height of your air cleaner assembly. Be sure to account for this when checking hood clearance.

What's this adapter typically used for?
This adapter is commonly used to convert between different air cleaner stud thread sizes, allowing compatible air cleaner components with 1/4"-20 and 5/16"-18 threads to be used together in custom or replacement assemblies.

What's the material and finish?
This adapter is manufactured from zinc-plated steel for corrosion resistance.

Emissions Notice

This product does not affect vehicle emissions and is not subject to emissions compliance regulations.