Yankee Hill Machine Co. HUB Direct Thread Adapter - 1/2"x28 TPI, Universal 1.375"x24 HUB Suppressor Mounting Pattern, Heat-Treated 17-4 PH Stainless Steel, Matte Black Oxide Finish - YHM-2189-28 / 841812101857
Product Description
Configuring a highly precise tactical carbine, dedicated precision rimfire platform, or an ultra-lightweight suppressed weapon staging framework requires a rock-solid muzzle mounting interface. Standard quick-detach muzzle brakes and heavy ratcheting collars add multiple tolerance stacking layers that can cause micro-misalignments, risking catastrophic baffle strikes or horizontal point-of-impact shifts on your bench. The **Yankee Hill Machine Co.® HUB Direct Thread Mount 1/2x28 to 1.375x24 (YHM-2189-28 / 841812101857)** completely flatlines these alignment and system weight bottlenecks, delivering an ultra-low profile **industry-standard HUB conversion insert** built from heat-treated tactical steel.
Proudly engineered and precision CNC-machined in the United States by Yankee Hill Machine (YHM), this high-tolerance adapter allows shooters to convert modular suppressors into a streamlined, lightweight direct-thread setup. Carved from a solid piece of high-tensile **17-4 PH stainless steel** and encased in a corrosion-proof matte black oxide skin, it features universal **1.375"x24 TPI masculine backend threads (HUB / Bravo standard)**. By spinning this adapter into the rear housing threads of a compatible silencer shell, you can mount the suppressor directly onto standard **1/2"x28 TPI barrel threads**. This significantly shortens the weapon's overall forward profile, drops front-end carry weight, and guarantees a perfectly square shoulder seat straight from your armorer bench.
Engineered to thread cleanly into any standard universal HUB silencer body, this factory-calibrated direct interface adapter delivers rock-solid internal alignment directly from your workspace bench.
*Armorer Bench Notes & Real-World Suppressor Staging Guidance: The YHM YHM-2189-28 direct thread adapter arrives workspace ready, packaged securely in factory original inventory tracking enclosures. UNIVERSAL HUB 1.375x24 BACKEND INTERFACE MATRIX: The external masculine thread tracks are engineered natively, strictly, and dimensionally to anchor into **any suppressor rear housing featuring industry-standard 1.375"-24 TPI HUB / Bravo internal threading**. *Host Barrel Thread Checklist:* The inner core features **1/2"-28 TPI center-bore formatting**, matching standard 5.56x45mm NATO, .223 Remington, .22 LR rimfire, and similar small-bore barrel muzzles on your bench. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host long gun is completely clear of live ammunition, the magazine is removed, and the fire control area is safe. 2. Thoroughly clean the rear internal threads of your HUB-compatible suppressor shell using a wire brush to clear out stubborn carbon deposits. 3. Apply a micro-bead of high-temperature anti-seize compound to the adapter\'s external 1.375x24 threads to prevent heat-lock freezing. 4. Thread the YHM adapter clockwise into the rear of the suppressor body by hand until the shoulder fits flush. 5. Engage the adapter\'s integrated wrench flats with a standard open-end tool or hook spanner, torquing the assembly tightly to **25 to 30 foot-pounds** against the silencer shell. 6. Spin the entire completed suppressor assembly onto your clean 1/2x28 barrel muzzle threads clockwise until it bottoms square against the barrel shoulder, then insert a bore alignment rod from the breech to check concentricity before rolling downrange.*
Key Features
- Universal 1.375"x24 HUB Standardization: Docks seamlessly with any modern modular suppressor built around the standard Bravo / HUB internal rear thread pattern.
- Ultra-Low Profile Footprint: Eliminates heavy locking collars and bulky muzzle adapters, significantly shortening the system's length and reducing front-end carry weight.
- Hardened 17-4 PH Stainless Steel: Precision CNC-machined from ultra-dense, heat-treated stainless steel alloy to withstand brutal muzzle blast pressures without eroding.
- Flawless 1/2x28 Thread Alignment: Tapped to absolute concentricity specs to provide a square, wobble-free anchor on standard 22-caliber and 5.56mm barrel shoulders.
- Black Oxide Corrosion Shield: Coated in a deep matte black oxide armor skin that resists high-temperature scaling, sweat corrosion, and harsh carbon-cutting solvents.
- Integrated Mechanical Wrench Flats: Features a raised, high-friction hex geometric shoulder to ensure easy torque application and removal using standard armor tools.
Product Specifications
- Brand: Yankee Hill Machine Co.® / YHM (Northampton, Massachusetts)
- Model Line: HUB Series Suppressor Conversion Adapters & Mounting Modules
- MPN/SKU Code: YHM-2189-28 (HUB Direct Thread 1/2\"x28 Specification Base SKU)
- UPC Code Profile: 841812101857
- Suppressor Rear Interface: Industry-Standard 1.375"x24 TPI (HUB / Bravo Internal Thread Pattern) Natively
- Barrel Muzzle Thread Pitch: 1/2"x28 TPI (Threads Per Inch) Right Hand Standard Caliber Profile
- Maximum Internal Bore Pass: Designed for 5.56mm NATO, .223 Rem, and .22 LR Caliber Groups Maximum
- Mounting Installation Style: Low-Profile Thread-In Conversion Adapter Unit
- Structural Material Base: Precision CNC-Machined Solid 17-4 PH (Precipitation-Hardening) Stainless Steel
- Exterior Surface Protection: Matte Black Oxide Heat-Treated Anti-Wear Mechanical Finish Shield
- Tool Interface Layout: Integrated Machined Hex Flange / Perimeter Wrench Flat Track
- Full Kit Component Checklist: 1x YHM HUB Direct Thread 1/2x28 Adapter Component Only
- Packaging Format Class: Factory Original Sealed YHM Branded Spec Label Retail Presentation Box
- Product Type Category: Suppressor Accessories / HUB Mounts & Direct Thread Silencer Adapters
- Overall Mechanical Outer Diameter: ~1.43 Inches (~36.3 mm Matching Universal Rear Tube Caps)
- Overall Physical Component Length: ~0.85 Inches (~21.5 mm Ultra-Compact Horizontal Extension Footprint)
- Net Component Module Mass: ~2.10 Ounces (~59.5 Grams High-Strength Lightweight Steel Build)
- Global Quality Certifications: Engineered to Rigid Industrial Duty and Full-Auto Fire Rating Profiles
- Warranty Tracking Protection: Fully Backed by YHM Lifetime Factory Product Materials Guarantee
