Yankee Hill Machine® HUB Direct Thread Suppressor Mount – 3/4"x24 TPI – 17-4 PH Stainless Steel – YHM-2189-24C
The Yankee Hill Machine® HUB Direct Thread Suppressor Adapter Mount (YHM-2189-24C) is a premium, heavy-duty NFA firearm mounting component masterfully engineered to convert standard HUB-compatible silencers into a streamlined, ultra-secure direct thread system. While traditional Quick Detach (QD) muzzle mounts offer rapid multi-gun transitions on paper, they add significant mechanical length, introduce multiple locking tolerance margins that increase the risk of point-of-impact (POI) shift, and append noticeable front-end weight to your rifle layout. The YHM HUB Direct Thread adapter completely bypasses those platform liabilities. This specialized hardware core (841812102625) provides an exceptional, rock-solid mounting platform for precision rifle shooters, big-bore hunters, and tactical operators who value absolute mechanical simplicity and repeatable alignment tracking.
The structural foundation of this high-performance adapter is meticulously CNC-machined from a monolithic stock of 17-4 PH stainless steel. Globally celebrated within aerospace, defense, and high-pressure cutlery sectors for its immense tensile strength, structural fatigue threshold, and premium corrosion immunity, 17-4 PH ensures the adapter easily withstands intense thermal energy spikes and the abrasive, high-velocity muzzle blast delivered by modern large-bore cartridges. The defining technical edge of the YHM-2189-24C configuration is its industry-standard 1.375"x24 TPI external HUB thread pitch (often called Bravo or Omega mounting threads) paired with a specialized 3/4"x24 TPI internal barrel thread pitch. This robust configuration allows shooters to safely adapt popular HUB-compatible silencers—such as the YHM R45, SilencerCo Hybrid 46, or Dead Air Nomad—straight onto heavy-barrel profiles typically found on large-bore rifles, including .450 Bushmaster and .458 SOCOM platforms.
The true operational highlight of this tactical adapter assembly lies in its incredibly low-profile footprint and low-maintenance mechanics. The steel core is treated with an advanced, non-reflective **Black Oxide or Melonite QPQ finish** that hardens the outer boundaries, reduces thread friction, and provides supreme resistance to harsh carbon solvents and ambient field moisture. Measuring a mere **0.30 inches of added length** beyond the suppressor’s rear wall, it minimizes the system's physical lever-arm effect on the barrel while scaling total structural mass down to an ultra-lightweight 1.70 ounces. Outfitted with precision-cut wrench flats that permit easy installation via a standard 3/4" open-end wrench, this American-made milestone delivers absolute mechanical authority for shooters navigating demanding field environments.
Includes: (1) Yankee Hill Machine HUB Direct Thread Suppressor Mount Adapter Assembly (1.375"-24 External HUB / 3/4"-24 Internal Barrel Thread Spec, Black Finish), and Factory Presentation Cardboard Retail Box.
*Direct Thread Torque & Alignment Safety Guidance: To ensure a perfectly coaxial alignment line and prevent permanent thread binding or catastrophic baffle strikes, completely clear and degrease both your rifle barrel threads and the adapter’s internal threads prior to mounting. Hand-thread the assembly cleanly until it seats firmly flush against the barrel shoulder, and torque to factory specifications using a dedicated wrench. Regularly audit the suppressor’s snug seat during extended training strings, as direct barrel vibrations and thermal expansion cycles can cause direct thread mounts to gradually migrate forward.
Key Features
- Universal 1.375"x24 HUB Threading: Industry-standard external thread layout provides drop-in compatibility with a massive variety of modern silencer brands utilizing the Bravo/Omega footprint.
- Heavy-Duty 3/4"x24 Barrel Pitch: Purpose-built to screw straight onto large-bore or heavy-contour rifle barrels, providing an incredibly secure, thread-dense anchoring base.
- Premium 17-4 PH Stainless Steel: Hardened weapons-grade steel core easily shrugs off severe muzzle blast erosion, extreme gas expansion pressures, and thread stripping across heavy duty cycles.
- Ultra-Lightweight Low-Profile Profile: Adds only 0.3" of physical length to the suppressor core while weighing just 1.7 ounces, preserving optimal weapon system balance.
- Corrosion-Proof Black Finish: Matte wear-resistant treatment shields the underlying steel matrix from carbon fouling, high heat, and harsh ambient weather tracking lines.
- Integrated Precision Wrench Flats: Features cleanly machined perimeter flats to permit positive tool engagement with standard open-end wrenches for effortless installation and removal.
Product Specifications
- Brand: Yankee Hill Machine® / YHM (East Hampton, MA)
- Product Line: Universal Suppressor Interface Mount Matrix
- Model Designation: HUB Direct Thread Adapter Mount 3/4-24
- SKU / MPN: YHM-2189-24C (Alternative Part Identifiers: 2189-24C / SU-PAYHM218924C)
- External Suppressor Mount Interface: Industry Standard 1.375"x24 TPI (HUB / Bravo / Omega Compatible)
- Internal Barrel Thread Specification: 3/4"x24 TPI Right-Hand
- Aperture Core Clearance: up to .45 Caliber Bore Safe (.450 Bushmaster, .458 SOCOM Compatible)
- Material Core Class: Monolithic High-Strength 17-4 PH Heat-Treated Stainless Steel
- Surface Finish Class: Technical Low-Friction Black Oxide / Melonite QPQ Treatment
- Added Longitudinal System Length: 0.30 Inches (7.62 mm)
- Outer System Component Diameter: 1.5625 Inches (39.69 mm)
- Installation Tool Requirement: 3/4" Open-End Wrench / Compatible Spanner
- Product Net Component Weight: 1.70 oz (48.1 g) - Ultra-Light Direct Interface Class
- Total Shipping Pack Mass: ~0.40 lbs (Including Protective Padded Box Wrap)
- UPC Barcode: 841812102625
