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Changzhou Fenglan New Materials Co., Ltd.

Ring Tongue Connecting Terminal

-- Steady & Reliable Manufacturer --

Ring Tongue Connecting Terminal Overview

A ring tongue connecting terminal — commonly called a ring lug or ring crimp terminal — is a closed-loop crimp terminal in which the wire barrel is crimped onto the conductor and the opposite end forms a fully enclosed circular eyelet that slides over a bolt or stud. Because the ring completely encircles the fastener, the terminal cannot slip off accidentally if the bolt loosens, making it the most secure and vibration-resistant crimp lug type available.

Fenglan manufactures ring tongue terminals in tin-plated electrolytic copper with PVC or nylon insulated barrels, covering wire sizes from 0.5 mm² to 240 mm² (AWG 20 – 500 kcmil) and stud hole sizes M3 to M20. Uninsulated heavy-duty versions for battery, earthing, and power cable terminations are available in standard and long-barrel configurations.

Related Products

Specification

Terminal TypeRing tongue / ring lug (closed-barrel crimp)
Wire Range0.5 mm² – 240 mm² (AWG 20 – 500 kcmil)
Stud Hole SizeM3 / M4 / M5 / M6 / M8 / M10 / M12 / M16 / M20
Contact MaterialElectrolytic copper, tin-plated
Insulation MaterialPVC (standard); nylon PA66 (high-temp); uninsulated (heavy gauge)
Rated VoltageUp to 1,000 V AC/DC
Rated CurrentUp to 400 A (240 mm² lug)
Operating Temperature–40 °C to +105 °C (PVC); –40 °C to +125 °C (nylon / uninsulated)
Colour CodingRed (0.5–1.5 mm²), Blue (1.5–2.5 mm²), Yellow (4–6 mm²); uninsulated above 6 mm²
Barrel OptionsStandard barrel; long barrel (dual crimp zone, extra pull-out strength)
StandardsUL 486A-486B, DIN 46234, CE, RoHS
Crimping ToolRatchet crimper (≤ 10 mm²); hydraulic hex or indent crimper (≥ 16 mm²)
MOQ100 pcs; 50 pcs sample

Application

  • Battery and starter system connections — automotive, marine, and stationary battery positive and negative post terminations requiring vibration-proof retention
  • Earthing and bonding — equipment chassis earthing straps, switchgear earth bus connections, and structural bonding where the terminal must stay on the stud regardless of fastener torque loss
  • Motor and generator terminal boxes — stator winding lead termination on bolted terminal studs inside motor terminal boxes up to 11 kV (in conjunction with HV stress-control accessories)
  • Bus-bar and switchgear connections — cable-to-bus-bar bolted joints in LV switchgear, MCCs, and distribution boards
  • Solar PV string and combiner wiring — DC cable termination on inverter input bus bars and combiner box fuse-holders
  • Telecommunications and UPS battery systems — rack-mounted battery string interconnects and UPS output cable terminations requiring maintenance-safe retention
  • Heavy transport and off-highway vehicles — alternator output, starter motor, and power distribution stud connections subject to continuous vibration and thermal cycling

Advantage

  • Cannot slip off a loosened fastener — the fully closed ring physically retains the terminal on the stud even if the bolt partially backs out, preventing accidental disconnection and the arcing or fire risk that an open-fork terminal could present in the same situation
  • Maximum vibration resistance — ring terminals are specified by automotive, aerospace, and railway standards (ISO 6722, MIL-DTL-22520) for the most severe vibration environments precisely because the closed eyelet prevents any relative movement between terminal and stud
  • Gas-tight crimp joint — the copper barrel deforms around all conductor strands under controlled crimp force, excluding air from the wire-to-terminal interface and preventing long-term oxidation — the primary cause of high-resistance crimp joints in outdoor and marine applications
  • Wide current range in one family — from 0.5 mm² signal wires at M3 studs up to 240 mm² power cables at M20 studs, the same ring terminal design scales to cover every panel wiring requirement
  • Long-barrel option for superior pull-out strength — the dual-zone long barrel increases the crimped contact length by 50%, improving pull-out force by up to 30% for high-vibration and high-current applications where standard barrel length is insufficient
  • UL 486A-486B listed and DIN 46234 compliant — dual certification satisfies North American UL-listed panel requirements and European DIN wiring standards without separate product variants, simplifying global OEM procurement

Payment & Shipping

We accept T/T (bank transfer), L/C at sight, PayPal (samples), and Western Union. A 30% deposit is required to confirm production, with the balance paid before shipment.

Standard lead time is 7–15 business days for regular orders; prototype samples ship within 3–5 days. We ship worldwide via DHL, FedEx, UPS, sea freight (FCL/LCL), and air freight. FOB Changzhou and CIF terms are both available. All goods are packed in export-standard cartons with foam padding or wooden crates for heavy items. A commercial invoice, packing list, and COA are provided with every shipment. For large OEM orders, customized packaging and private-label options are available upon request.

  • Q: When should I choose a ring terminal over a fork (spade) terminal?
  • A: Choose a ring terminal for any connection that must remain secure under vibration, thermal cycling, or in safety-critical circuits where an accidental disconnection would be hazardous — such as battery connections, earth bonding, and motor terminals. Choose a fork (spade) terminal when the wire must be disconnected and reconnected frequently during maintenance without fully removing the bolt, and the application is not subject to severe vibration. As a general rule: ring terminals for permanent connections, fork terminals for serviceable connections.
  • Q: What is the correct bolt torque for ring terminal connections?
  • A: Torque values depend on stud size and material. As a general guide for steel studs: M4 — 1.5–2.0 N·m; M6 — 4–6 N·m; M8 — 9–13 N·m; M10 — 18–25 N·m. Always apply a flat washer under the nut to protect the terminal eyelet surface. Use a calibrated torque wrench and record the torque in your installation documentation for safety-critical connections such as earth bonding and bus-bar joints.
  • Q: Can I stack multiple ring terminals on one stud?
  • A: Yes, up to a practical limit. Stacking is acceptable when the stud length and thread engagement allow it, and the total stack height does not compromise the bolt's minimum thread engagement (typically 1× bolt diameter). Place the largest-area ring terminal closest to the mounting surface, and use a flat washer between each terminal layer to prevent the eyelets from rotating against each other under vibration. We recommend a maximum of three terminals per stud for reliable long-term contact.
  • Q: Are ring terminals suitable for aluminium conductors?
  • A: Standard tin-plated copper ring terminals are not recommended for direct crimping onto aluminium conductors because aluminium oxide on the conductor surface prevents a gas-tight crimp, and galvanic corrosion at the copper-aluminium interface increases contact resistance over time. For aluminium cables, specify our bimetallic (AL/CU) ring lug variant, which has an aluminium barrel friction-welded to a copper palm — this allows a proper crimp to the aluminium conductor while presenting a copper contact face to the bus-bar or stud.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
Changzhou Fenglan New Materials Co., Ltd.
ABOUT US
Quality is Our Core Competitiveness
Changzhou Fenglan New Materials Co., Ltd.
Founded in 2010, As China Ring Tongue Connecting Terminal Manufacturers and Ring Tongue Connecting Terminal Company. we are dedicated to manufacturing precision parts for automotive, industrial, and electrical applications. Backed by advanced manufacturing and R&D, we provide high-quality products and trusted solutions to our clients. We provide a wide selection of components to meet diverse industry needs: Electric Shafts: Drive shafts, coil motor shafts, servo motor shafts, water pump motor shafts, industrial motor shafts, and magnetic levitation motor shafts. Hardware: Precision parts for medical equipment, water heater coils, plumbing fittings, and various gas springs. Our commitment is to support our customers with reliable performance and long-term value.
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