Five Stone Tactical Direct Drive HUB Adapter - 1/2x28 - Black Nitride The Five Stone Tactical Direct Drive HUB Adapter with a Black Nitride finish provides a direct-thread connection between a barrel with 1/2x28 muzzle threads and a compatible suppressor using the industry-standard 1.375x24 Bravo, or HUB, rear interface. It is a specialized solution for shooters who prefer a straightforward suppressor-to-barrel mounting path without an intermediate quick-detach muzzle device. Precision-machined from 17-4 PH H900 stainless steel, the Direct Drive weighs 2.3 oz and includes integrated 3/4-inch wrench flats. The compact adapter converts the suppressor's HUB rear thread to the specified barrel thread while providing a positive tool surface for controlled installation and removal. Build a clean direct-thread HUB configuration. Select the 1/2x28 Black Nitride Direct Drive at BattleHawk Armory after confirming the suppressor rear thread, barrel shoulder, bore clearance, and cartridge rating. 1.375x24 Bravo HUB Suppressor Interface The suppressor side uses the common 1.375x24 Bravo thread found on many HUB-equipped suppressors. This standardized rear interface allows the adapter to install into a compatible suppressor body and present the selected barrel thread on the opposite side. Confirm the suppressor's exact rear-thread specification and available internal clearance before purchase. 1/2x28 Direct-Thread Connection This version threads directly onto a barrel with verified 1/2x28 muzzle threads. Direct threading minimizes the number of interfaces in the mounting stack, but it requires correct shoulder geometry, adequate thread engagement, and an adapter bore appropriate for the intended projectile. Thread pitch alone does not establish caliber compatibility. 17-4 PH H900 Stainless Steel The adapter is precision-machined from 17-4 PH H900 stainless steel for strength and dimensional stability in a high-heat suppressor mount. The Black Nitride surface treatment distinguishes this configuration while retaining the stated HUB and barrel interfaces. Integrated 3/4-Inch Wrench Flats The 3/4-inch wrench flats provide a defined tool surface for installing and removing the adapter. Use a properly fitting wrench and follow the current installation procedure for the suppressor and host barrel. Do not use the suppressor tube, end cap, or other unsupported surfaces as a substitute for the wrench flats. Installation and Alignment Work only on unloaded, cool equipment. Clean and inspect the HUB and 1/2x28 threads, confirm the barrel shoulder and adapter seat squarely, and verify the adapter does not contact internal suppressor components. After assembly, check suppressor alignment with a suitable rod before live fire. Use a qualified gunsmith when thread quality, bore clearance, or alignment is uncertain. Product Specifications Manufacturer: Five Stone Tactical Model: Direct Drive HUB Adapter Material: 17-4 PH H900 stainless steel Finish: Black Nitride Suppressor Interface: 1.375x24 Bravo (HUB) Barrel Thread: 1/2x28 Mounting Method: Direct thread Wrench Flats: 3/4 inch Weight: 2.3 oz Manufacturer SKU: 620100-B UPC: 850080471333 Frequently Asked Questions What suppressors accept the Direct Drive adapter? It is designed for compatible suppressors using the 1.375x24 Bravo, commonly called HUB, rear thread. Confirm the suppressor's exact interface before purchase. What barrel thread does this adapter use? This SKU uses 1/2x28 barrel threads. Verify the barrel thread class, shoulder, projectile diameter, and suppressor clearance as a complete system. Does direct thread eliminate fitment checks? No. Direct-thread mounting still requires correct thread engagement, a square shoulder, adequate bore clearance, and confirmed suppressor alignment. Purchase the Five Stone Tactical Direct Drive HUB Adapter at BattleHawk Armory. Add this professional-grade 1/2x28 Black Nitride adapter to a precisely verified direct-thread suppressor setup.