Three-Lug Adapter

Description: A Three-Lug Adapter is a mechanical coupling interface which allows secure, quick-attach/detach mounting via three equidistant lugs. Typically used to connect rotating or detachable components (such as mounting assemblies, couplers, or interface hubs) to a fixed base while maintaining alignment, load-bearing capability and precise engagement.

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Specification:

Interface Style: 3-lug male/female interface
Thread / Mounting Connection: Threaded ½″-28 UNF, 5⁄8″-24, M13.5×1 LH, or custom options available
Overall Length: Approx. 1.4″ (typical for some variants – reference Griffin Armament)
Material: 4140 Steel / Chromoly / 17-4PH Stainless Steel / custom alloys as required
Finish / Coating: Nitrided / Melonite / Black Oxide / Passivated Stainless
External Diameter / Lug OD: As required to match the mating component standard
Lug Seat Plane Flatness: All three lug faces machined on the same plane to ensure perpendicularity (CGS Group LLC reference)
Compatibility: Standardized interface (e.g., “HK-style three-lug”) for universal fitment (Griffin Armament reference)
Weight: Approx. 0.83 oz (~23.6 g) for one variant (HB Industries reference)
Accessories / Features: Wrench flats for easy installation, O-ring seats (if required for fuel seal application)
Tolerance / Finish Quality: Precision machined with tight dimensional control; lug seats maintained on the same plane; supplied with material certificates
Use Case / Application: Quick-detach couplings, mounting hubs, end-caps, and modular flow assemblies for refuelling and industrial systems

Features:

 Three-lug mounting provides secure, repeatable engagement and prevents rotational slip once locked.
 Machined lug seats ensure perfect alignment, reducing stress and wear on attached components.
 High-strength material and protective finish deliver long service life even under load or harsh environment.
 Compatible with common interface standards (e.g., “HK-style three-lug”), making it versatile for modularassemblies.
 Compact design minimises protrusion while providing the necessary mounting interface.
 Optional features such as wrench flats and sealing O-rings simplify installation and improve performance.

Three-Lug Adapter – FAQs

A quick-connect interface for fast and secure hose coupling.

4140 steel, stainless steel, chromoly, or aluminium.

UNF, NPT, BSP, metric threads, or custom.

Yes, it matches common “3-lug” industry patterns.

Using wrench flats or threaded mounts.

Fuel hoses, nozzles, modular couplings, and end caps.

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Intense dedication is the absolute cornerstone of
HR Auto Solutions. Since our establishment in 2017, we have devoted ourselves to a purpose greater than manufacturing—to engineer and supply high-reliability solutions for critical fluid transfer, metering, and safety within the fueling industry.
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