Fletcher Rifle Works® 17-4 Stainless Steel HUB Direct Thread Adapter – 1-3/8"x24 HUB to 1/2"x28 TPI Muzzle Mounting Conversion – Heat-Treated Heavy-Duty Steel – Black Oxide Finish – ST174TA1/2X28
Product Description
The Fletcher Rifle Works® 17-4 Stainless Steel HUB Direct Thread Adapter (ST174TA1/2X28) represents a high-end, extreme-duty mechanical benchmark in modular sound mitigation logistics, precision muzzle thread conversions, and bulletproof silencer security, expertly machined in Carrollton, Texas. Purpose-built to handle the immense pressures, blazing thermal vectors, and abrasive hot propellant gases generated by high-volume semi-automatic and fully automatic platforms, this rigid adapter permanently eliminates the failures common to complicated quick-detach configurations. While legacy multi-piece mount setups add unnecessary longitudinal leverage, complex locking teeth that wear flat over intense firing strings, and prone-to-leak friction collars, this direct-thread option delivers an immutable, concentric path straight to your barrel shoulder. This heavy-duty structural adapter (850044307364) serves as an indispensable primary anchor for precision tactical rifle setups, home defense configurations, and elite staging parameters.
The foundational core of this premium integration engine is precision-cut from a solid block of premium 17-4 PH precipitation-hardening stainless steel. Renowned throughout aerospace, defense, and military manufacturing for its superior material density, monumental structural yield strength, and exceptional corrosion resistance at extreme elevated temperatures, 17-4 stainless steel represents the ultimate choice for uncompromising hard-use deployment loops. Unlike softer steels or thin-walled alloys that erode rapidly when exposed to unburnt powder grains coming right out of a short rifle muzzle, this monolithic steel adapter acts as an unyielding structural anvil. The entire external surface is treated with a protective, chemical-resistant black oxide conversion finish that resists scuffs, minimizes solar reflection cells, and sheds combustion carbon deposits cleanly during routine maintenance cycles.
The true performance triumph of this American-built adaptation masterpiece lies in its standardized industry geometry and universal platform cross-compatibility. The exterior core features industry-standard 1-3/8"x24 TPI external HUB threads (1.375"x24 standard Bravo specification), allowing it to spin flawlessly into the rear expansion hub of top-tier silencers from SilencerCo, Dead Air, Rugged, YHM, and Fletcher's own custom suppressors. The interior bore tapers cleanly into a surgically precise 1/2"x28 TPI internal right-hand thread pattern, providing a direct, rock-solid match for standard 5.56 NATO/.223 Rem tactical rifles, 9mm pistol-caliber carbines, and high-performance rimfire weapon platforms. Measuring a precise 1.49-inch outer diameter to deliver a seamless flush fit against standard 1.50-inch suppressor tubes, this 2.17-ounce steel powerhouse yields complete physical and structural authority over your suppressed forward workspace alignment.
Includes: (1) Authentic Fletcher Rifle Works 17-4 Stainless Steel HUB Direct Thread Adapter (Black Oxide Finish, 1.375"x24 External HUB to 1/2"x28 Internal TPI Configuration), Packed inside Original Sealed Factory Protective Hardware Enclosure.
*HUB Thread Staging & Mounting Calibration Guidance: The Fletcher ST174TA1/2X28 utilizes universal 1.375"x24 HUB threads to secure your chosen suppressor shell. When interfacing this premium 17-4 stainless steel mount inside a matching steel or titanium suppressor rear expansion cavity, always apply a thin, uniform coating of high-temperature copper anti-seize or technical graphite grease to the external HUB threads to isolate the metal faces from thermal galling or permanent cold-welding. Utilizing a dedicated spanner wrench across the machined perimeter slots, torque the adapter firmly into the suppressor tube to 20 to 25 ft-lbs before spinning the fully integrated unit down onto your barrel's 1/2"x28 muzzle threads. Prior to beginning range firing loops or checking concentricity with a alignment rod, explicitly verify your host firearm is verified clear, completely unloaded, and safe with all ammunition isolated from the workbench space.
Key Features
- Universal 1-3/8"x24 HUB Standard: Pairs natively with industry-standard 1.375"x24 universal suppressor rear cavities, supporting immediate integration across an expansive multi-brand silencer library.
- Premium 17-4 PH Stainless Steel Billet: Precision CNC-machined from solid precipitation-hardened steel block matrices to supply elite structural integrity capable of enduring sustained full-auto heat cycles.
- Full-Auto Rated Rugged Core: Heavy-duty steel wall construction handles massive muzzle blast erosion vectors from short-barreled tactical carbines with zero erosion or failure.
- Machined Spanner Slots: High-leverage external perimeter cuts allow clean spanner wrench engagement for seamless, high-torque installations that prevent rounding or marring the finish.
- 1/2"x28 TPI Internal Threads: Mapped precisely to align with standard 5.56/.223 centerfire rifles, 9mm sub-carbines, and .22 LR rimfire barrels for versatile cross-weapon staging.
- Proudly Made in Texas: Designed, engineered, and manufactured natively in Carrollton, Texas, under rigorous quality control bounds to guarantee flawless concentricity and zero-play tracking.
Product Specifications
- Brand: Fletcher Rifle Works® (Precision CNC Machining - Made in Texas, USA)
- Product Line: Premium Heavy-Duty Suppressor Mounts & HUB Thread Logistics
- Model Series Designation: 17-4 Stainless Steel HUB Direct Thread Suppressor Mount Adapter
- SKU / MPN: ST174TA1/2X28 (Alternative Factory Identifiers: ST-174-TA1/2X28 / ST174TA12X28)
- Suppressor Thread Mounting Base: Industry Standard 1-3/8"x24 TPI HUB Threads (1.375"x24 Universal Bravo Spec)
- Host Muzzle Thread Pitch: 1/2"x28 TPI Right Hand (Standard Centerfire & Rimfire Metric)
- Material Composition Core: High-Yield 17-4 PH Precipitation-Hardening Stainless Steel Alloy
- Surface Protection Finishing: Highly Resilient Deep Black Oxide Anti-Abrasion Conversion Coating
- Component Outer Diameter: 1.490 Inches (Provides a Clean Flush Interface with Standard 1.5" Suppressor Tubes)
- Longitudinal Footprint Length: ~2.00 Inches Comprehensive Structural Length
- Tool Interface Configuration: Integrated Perimeter Spanner Wrench Engagement Slots
- Caliber Operational Track: 5.56x45mm NATO, .223 Remington, .22 LR, .22 WMR, .17 HMR, and 9mm Luger (Ensure Suppressor Internal Bore Clears Chosen Projectile)
- Automatic Fire Endurance Rating: Certified Heavy Use / Full-Auto Rated
- Product Net Component Weight: ~2.17 oz (~61.55 g / ~0.14 lbs) - Optimized Kinetic Mass
- Total Packaging Shipping Mass: ~0.45 lbs (Enclosed Inside Protective Padded Shipping Layer)
- UPC Barcode Number: 850044307364
