Threaded Flange TH

Overview

TH threaded flange, also known as screwed flange, is a forged non-welded flange that relies on the internal tapered pipe thread of the flange and the external threaded steel pipe being screwed together for assembly, and then combined with bolts and gaskets to achieve sealed pipeline connection. Mainstream execution standards include ASME B16.5, GB/T9116, HG/T20592, HG/T20615; common sizes are DN15-DN100 (NPS 1/2″-4″), mostly used for small and medium diameter pipelines. Its greatest advantage is that it requires no hot work welding, making it suitable for explosion-proof, welding-prohibited, modification and emergency repair scenarios, but due to the limitations of the threaded structure, it is not suitable for main pipelines with severe thermal cycling and strong vibration. The product is widely used in instrument air sources, gas, fire protection, and auxiliary utility pipelines, and is the preferred flange fitting for flammable and explosive environments and galvanized threaded pipelines, often supplied with NPT and BSPT tapered pipe threads.

Key Features

The core selling point of TH threaded flanges is weld-free installation, requiring no hot work, avoiding welding risks, and making them especially suitable for high-risk working conditions such as explosion-proof and welding-prohibited environments. The integral forging process ensures uniform product density, no sand holes or gas pores, high strength, and good pressure resistance and sealing performance. Thread precision is high, engagement is tight, and water or gas leakage is unlikely; installation speed far exceeds welded flanges, greatly saving labor costs and construction time. Later disassembly, assembly, and maintenance are extremely convenient, and the full range has precise standard dimensions, standard hole positions, and strong interchangeability. Stock specifications are complete, delivery is fast, and customization is supported for multiple thread systems, multiple materials, and multiple pressure ratings.

Applications

TH threaded flanges are core-suited to industrial scenarios where hot work is prohibited, welding is inconvenient, and construction space is narrow, making them the preferred fitting for explosion-proof, gas, and fire protection projects. They are mainly used in petrochemical auxiliary pipelines, urban gas transmission networks, fire sprinkler galvanized pipelines, power plant instrument control pipelines, water treatment and environmental protection equipment pipelines, pharmaceutical clean auxiliary pipelines, and electromechanical equipment pneumatic and hydraulic pipelines. They are suitable for indoor equipment rooms, confined spaces, flammable and explosive workshops, and old pipeline modification and repair scenarios. Due to structural characteristics, they are not suitable for high-temperature cycling, strong vibration, or high-pressure main process pipelines; they focus on small-diameter, room-temperature, low-to-medium pressure, and detachable working conditions, perfectly solving engineering difficulties where on-site welding is impossible, hot work is not allowed, and rapid emergency repair installation is required.

Specifications

Execution standards: ASME B16.5, GB/T9116, HG/T20592, HG/T20615; nominal diameter: DN15-DN100 (NPS 1/2″-4″); pressure rating: Class150-2500LB, PN10-PN100; thread systems: NPT standard, BSPT/Rp/Rc customized; sealing face forms: RF, FF, MFM, TG, RJ; process: integral forging, precision turning, precision thread turning, non-destructive testing; connection method: threaded engagement + bolt fastening; working temperature: carbon steel -20℃~425℃, stainless steel -196℃~600℃; compatible media: water, gas, steam, ordinary chemical fluids. All parameters are strictly implemented according to standards, non-standard customization is supported, and please contact us to confirm the specific configuration.

Purchase & Delivery

Our factory's TH threaded flanges use special multi-layer protective packaging for foreign trade export, providing full-process rust prevention, impact prevention, and thread damage prevention. The threaded ports of the product are equipped with special plastic thread protectors to prevent collision, thread slipping, tooth loss, and damage to thread precision during transportation. The flange sealing face is covered with a dust-proof and scratch-proof protective film, and each piece is individually wrapped and isolated with bubble wrap. Conventional specifications are classified and packed into thickened export cartons, and large-volume full orders are packed on fumigated solid wood pallets, reinforced with steel straps for stability, suitable for long-distance sea transportation. The outer packaging clearly marks model, standard, material, specification, pressure, quantity, batch, and shipping mark information. Neutral packaging, customized customer LOGO branding, customized shipping marks, and customized packaging box styles are supported, fully complying with export commodity inspection, customs clearance, and overseas warehousing standardization requirements. The MOQ for conventional in-stock standard specifications is as low as 1 piece, supporting sample testing, equipment repair, engineering material replenishment, and small-order trial orders. Conventional national standard and American standard in-stock TH threaded flanges have sufficient inventory, and standard specifications are shipped extremely quickly within 24 hours; conventional batch standard order production lead time is 3-7 working days; conventional thread modification, sealing face modification, and ordinary non-standard size fine-tuning orders have a lead time of 7-10 working days. For customization needs such as special materials, ultra-high pressure ratings, and special anti-corrosion, please contact us to confirm the lead time.

Service & Support

Our factory provides one-stop foreign trade exclusive after-sales service. All TH threaded flanges undergo multiple quality inspections before leaving the factory to prevent defective products, flawed products, and poor-thread products from flowing out. If after arrival there are issues such as inconsistent specifications, quality defects, thread flaws, or transportation damage, we support free replacement, return and exchange, and remanufacturing, and bear the corresponding logistics losses. We provide customers free of charge with selection guidance, parameter data, installation suggestions, and threaded sealing construction techniques. We support long-term customer inventory custody, partial shipment, and replenishment on demand. Under standard working conditions, products enjoy long-term warranty, and non-human-caused damage is eligible for after-sales protection. We provide lifetime technical Q&A, order follow-up, and after-sales coordination services, fully protecting the procurement rights and engineering use safety of customers at home and abroad.