Bronze Transformer Spade Terminals | Cast Bronze Transformer Spade Connectors
Conex Casting manufactures precision bronze transformer spade terminals and bronze transformer spade connectors for stud-to-busbar vertical takeoff connections in power transformers, distribution transformers, and substation equipment. Produced from high-copper-content alloys and electroplated to specification, our spade terminals are supplied to electrical OEMs, EPC contractors, power utilities, and electrical distributors globally. Compliant with IEC, ASTM, and BS standards. Price: US$ 15.90/Kilo, CIF US Port.
Product Overview: Bronze Transformer Spade Terminals
Transformer spade terminals — also referred to as spade connectors, transformer bus bar takeoff connectors, bushing spade pads, transformer terminal spades, and substation spade fittings — are flat-tab copper alloy components that establish the bolted electrical interface between transformer stud bushings and bus bars in switchgear, distribution boards, and substation equipment. Conex Casting produces these through gravity die casting and sand casting in LG2 bronze (C83600), gunmetal, phosphor bronze, silicon bronze, and aluminium bronze, ensuring dimensional consistency, low contact resistance, and long service life across harsh electrical environments.
Stud-to-Bus Bar Vertical Takeoff Applications
Transformer spade terminals are engineered specifically for stud-to-single or multiple bus bar vertical takeoff connections where the transformer bushing stud passes through a mounting hole in the spade tab and is bolted directly to vertical bus bars. Key related terms: stud takeoff connector, vertical busbar spade, bushing stud terminal, transformer bus connection, bolted busbar spade, stud locking spade, bushing-to-busbar link, horizontal spade pad, transformer LV spade connector, multiple busbar takeoff spade. These configurations are standard in utility pad-mounted transformers, pole-mounted distribution transformers, and substation transformer assemblies worldwide.
Single-Hole and Multi-Hole Spade Configurations
Conex Casting supplies spade terminals in single-hole (Fig. 1), two-hole (Fig. 2), three-hole (Fig. 3), four-hole (Fig. 4), five-hole (Fig. 5), and six-hole (Fig. 6) configurations per NEMA spacing standards. Terminal lug mounting holes are 9/16″ (14.3 mm) diameter with 1-3/4″ (44.5 mm) NEMA spacing as standard. Related terms: NEMA-spaced spade terminal, multi-hole busbar connector, single-hole transformer spade, four-hole spade pad, busbar hole pattern, IEC transformer spade, standard NEMA transformer fitting, bolted tab connector, busbar lug spacing, transformer terminal pad layout. Custom hole patterns are available to match OEM transformer bushing layouts.
Stud Bonding and Locking Set Screw Options
Transformer spade terminals can be supplied with studs bonded directly to the terminal by adding suffix “-SS” to the catalog number (1 ea. stud locking set screw provided on all sizes). For sizes where “A” dimension is 1-14, two stud locking set screws are provided. Related terms: bonded stud spade terminal, stud locking screw, captive stud connector, fixed stud transformer terminal, transformer stud assembly, locking setscrew bushing, stud-bonded bus connector, captive hardware transformer fitting, transformer lug stud, bonded stud set screw. This feature simplifies field installation and eliminates loose hardware during transformer commissioning.
High-Copper Alloy Construction
All Conex Casting transformer spade terminals are manufactured from high copper content alloy, combining excellent electrical conductivity with the mechanical strength required for bolted bus connections in continuous-duty transformer service. Related terms: high copper content alloy spade, copper alloy transformer terminal, bronze bus connector, electrical grade casting, conducting spade terminal, transformer current path, low-resistance bus connection, high-conductivity bronze, copper casting spade, LG2 bronze transformer fitting. Alloy selection is guided by the application environment, current rating, and customer specification.
Tin Plating and Electroplating for Corrosion Protection
External-duty spade terminals are electroplated (electro-tinned) to prevent base metal oxidation, maintain stable contact resistance over years of service, and resist sulfurous and chloride-rich environments common in coastal and industrial substations. Conex Casting applies electrodeposited tin (ASTM B545) in 10-25 micron thickness as standard, with hot-dip tin, nickel, and silver plating available on request. Related terms: tin-plated spade terminal, electroplated transformer connector, ASTM B545 tin plating, electrodeposited tin spade, corrosion-resistant bushing connector, tinned bronze spade, oxidation-resistant transformer terminal, nickel-plated spade connector, anti-corrosion bus fitting, outdoor-rated spade terminal.
Use with Aluminium or Copper Compression Lugs
Conex Casting’s transformer spade terminals are fully compatible for use with aluminium or copper compression or bolted type conductor lugs, making them suitable for both aluminium and copper outgoing conductor systems. This dual-compatibility is critical for modern grid infrastructure where aluminium conductors are standard. Related terms: aluminium compression lug compatibility, copper compression lug spade, bimetallic transformer terminal, AL/CU compatible spade, aluminium conductor transformer fitting, aluminium bus bar spade, copper-aluminium transition terminal, compression lug interface, conductor lug transformer pad, bimetallic interface bushing connector.
Custom OEM and Project-Specific Spade Connectors
Conex Casting accepts custom orders for transformer spade connectors manufactured to customer drawings, samples, or OEM specifications, including non-standard dimensions, alloy grades, special coatings, and large production runs with statistical process control documentation. Related terms: custom bronze spade casting, OEM transformer spade parts, transformer spare parts manufacturer, IEC 60076 transformer accessories, ASTM B505 bronze casting, custom transformer terminal supplier, prototype spade connector, CNC machined spade terminal, custom bushing pad casting, transformer terminal to drawing. MOQ is negotiable for repeat OEM programs.
Key Features of Conex Casting Bronze Transformer Spade Terminals
- Manufactured from high copper content alloy, electroplated (electro-tinned) for corrosion resistance
- Compatible with aluminium or copper compression or bolted-type lugs
- Terminal lug mounting holes: 9/16″ (14.3 mm) diameter with 1-3/4″ (44.5 mm) NEMA spacing standard
- Available in Fig. 1 through Fig. 6 configurations (1-hole to 6-hole bus bar takeoff)
- Can be supplied with studs bonded to terminal (suffix “-SS”) and stud locking set screws
- Stud range: 3/8″-16 through 1″-14 UNC thread series
- Compliant with IEC 60076, ASTM B505, ANSI C57.12 bushing stud dimensions
- Full material traceability — heat number, OES analysis, dimensional records per EN 10204
- ISO 9001:2015 certified manufacturing; MTC (3.1/3.2) available
NEMA-Standard Hole Patterns and Bus Bar Spacing
All Conex Casting spade terminals conform to standard NEMA hole patterns for transformer bushing stud connections. The 1-3/4″ NEMA spacing ensures direct compatibility with North American transformer OEM bushing layouts and switchgear bus bar drilling patterns. Related terms: NEMA transformer bushing spacing, 1-3/4″ NEMA hole pattern, transformer bushing pad dimensions, ANSI bushing stud spacing, standard transformer terminal layout, NEMA 9/16 hole spade, transformer OEM bushing pad, North American transformer terminal, pad-mounted transformer spade, NEMA-compliant connector. NEMA and IEC custom spacing also available.
Mechanical Strength and Current Rating
Bronze spade terminals from Conex Casting provide the mechanical rigidity required for torqued bolted bus connections at transformer stud bushings, with tensile strengths ranging from 240-290 MPa (LG2 bronze) to 310-370 MPa (aluminium bronze C95400). Current ratings range from 200 A to 3000 A depending on cross-section. Related terms: high-tensile spade terminal, transformer stud torque rating, bus bar connection strength, bolted bus spade mechanical strength, transformer terminal current capacity, bronze casting tensile strength, spade connector ampacity, transformer connector thermal rating, bronze terminal mechanical properties, current-rated transformer spade.
Surface Finish and Contact Quality
All mating surfaces of Conex Casting transformer spade terminals are CNC-machined to a surface finish of Ra 1.6 µm or better on both contact faces, ensuring full face-to-face contact when bolted to bushing studs and bus bars. Thread forms (UNC, metric) are cut to tolerance class 6H/6g. Related terms: machined spade terminal surface, Ra 1.6 finish bronze, flat face bus connector, CNC-machined transformer fitting, contact surface quality spade, dimensional accuracy casting, thread tolerance 6H/6g, face-to-face transformer contact, CNC turned spade pad, machined bronze bus terminal.
Plating Variants and Coating Options
Standard electrodeposited tin plating (10-25 µm per ASTM B545) is offered on all external-duty spade terminals. Additional options include hot-dip tin coating, electroless nickel plating (ENP, 25-75 µm), and silver plating (5-25 µm) for GIS, high-temperature, and offshore/marine substation applications. Related terms: silver-plated spade terminal, nickel-plated transformer connector, ENP bronze casting, hot-dip tin spade, ASTM B545 compliant plating, offshore-grade transformer terminal, GIS substation spade, marine-grade bus connector, anti-tarnish spade terminal, high-temperature plating transformer.
Dimensional Customization and OEM Compatibility
Conex Casting reverse-engineers existing transformer spade connectors from OEM samples or 2D drawings and produces precise casting patterns for production runs. All critical dimensions (stud hole diameter, tab width, tab length, thickness, pad length “A”) are verified on CMM equipment before dispatch. Related terms: custom transformer spade casting, reverse engineering bronze terminal, OEM-compatible transformer connector, certified dimension report, CMM inspection spade, first article inspection FAI, dimensional compliance certificate, transformer spade to drawing, bronze casting pattern development, ISO 2768 spade tolerance.
Electrical Testing and Quality Verification
Each production batch undergoes contact resistance measurement (micro-ohm bridge), Brinell hardness test, OES spectroscopy for chemical composition, dimensional inspection, and plating thickness check. Optional salt-spray tests (ASTM B117) and pull-force tests are available. Related terms: contact resistance spade terminal, micro-ohm transformer fitting, Brinell hardness bronze spade, OES spectrometer bronze analysis, ASTM B117 salt spray test, spade connector quality test, material conformance certificate, IEC 60068 environmental test, bronze casting batch certificate, transformer terminal traceability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Material | High Copper Content Alloy (LG2 / C83600 standard; others available) |
| Stud Hole Diameter | 9/16″ (14.3 mm) standard NEMA |
| Mounting Hole Spacing | 1-3/4″ (44.5 mm) NEMA standard |
| Configuration | Fig. 1 (1-hole) through Fig. 6 (6-hole bus bar takeoff) |
| Stud Thread Range | 3/8″-16 to 1″-14 UNC |
| Tab Thickness (T) | .21 – .34 inch (5.3 – 8.6 mm) depending on size |
| Tab Width (W) | .88 – 1.44 inch (22.4 – 36.6 mm) depending on size |
| Pad Length (A) | 2.38 – 4.88 inch (60.5 – 124 mm) depending on catalog number |
| Plating | Electrodeposited tin 10-25 µm (ASTM B545); Ni, Ag available |
| Surface Finish (Mating Face) | Ra 1.6 µm (CNC machined) |
| Casting Process | Gravity Die Casting / Sand Casting |
| Hardness | HB 60-85 (LG2 bronze) |
| Tensile Strength | 240-290 MPa (LG2); up to 370 MPa (Al-Bronze) |
| Operating Temperature | -40°C to +120°C (tin plated); +180°C (Ni plated) |
| Current Rating | 200 A – 3000 A (application dependent) |
| Voltage Rating | Up to 400 kV (bushing-level) |
| Standards | IEC 60076, ASTM B505, ANSI C57.12, BS 1400 LG2 |
| Price | US$ 15.90/Kilo, CIF US Port |
Size Chart — Bronze Transformer Spade Terminals
The table below lists catalog reference codes (Conex Casting CX- series), figure numbers, and approximate dimensions for the full range of bronze transformer spade terminals. All dimensions in inches. Suffix “-SS” = stud bonded to terminal with locking set screw(s).
| Catalog No. (CX-) | Figure No. | B (Stud Thread) | W (Tab Width) | C | A (Pad Length) | T (Total Length) | W1 (Thickness) |
|---|---|---|---|---|---|---|---|
| CX-0314-2 | 1 | 3/8-16 | .88 | .43 | 2.38 | 4.09 | .25 |
| CX-0314-2L | 2 | 3/8-16 | .88 | .75 | 3.50 | 5.84 | .21 |
| CX-0314-4 | 3 | 3/8-16 | .88 | .43 | 4.13 | 5.71 | .25 |
| CX-0314-4L | 4 | 3/8-16 | .88 | .25 | 4.81 | 6.38 | .25 |
| CX-0313-2 | 1 | 1/2-13 | .88 | .43 | 2.38 | 4.09 | .21 |
| CX-0313-2L | 2 | 1/2-13 | .88 | .75 | 3.50 | 5.84 | .21 |
| CX-0313-4 | 3 | 1/2-13 | .88 | .43 | 4.13 | 5.75 | .25 |
| CX-0313-4L | 4 | 1/2-13 | .88 | .25 | 4.38 | 6.38 | .21 |
| CX-0511-2 | 1 | 5/8-11 | .88 | .40 | 2.38 | 4.09 | .25 |
| CX-0511-2L | 2 | 5/8-11 | .88 | .75 | 3.50 | 5.84 | .21 |
| CX-0511-4 | 3 | 5/8-11 | .88 | .43 | 4.13 | 5.75 | .25 |
| CX-0511-4L | 5 | 5/8-11 | .88 | .75 | 7.00 | 9.46 | .34 |
| CX-1014-2 | 1 | 1-14 | 1.38 | .43 | 2.38 | 4.09 | .28 |
| CX-1014-2L | 2 | 1-14 | 1.38 | .25 | 5.13 | 8.38 | .34 |
| CX-1014-4 | 3 | 1-14 | 1.38 | .43 | 5.75 | 9.44 | .34 |
| CX-1014-4L | 5 | 1-14 | 1.44 | .75 | 7.00 | 9.44 | .34 |
| CX-1014-6 | 4 | 1-14 | 1.38 | .43 | 5.13 | 8.69 | .34 |
| CX-1014-8 | 6 | 1-14 | 1.38 | .43 | 4.88 | 9.44 | .28 |
Note: B = Stud thread size (UNC); W = Tab width; C = C dimension; A = Pad length; T = Total length; W1 = Thickness. Suffix “-SS” available on all sizes for bonded stud with locking set screws. Custom sizes on request.
Bronze Grades Available — Alloy Comparison Table
| Grade | UNS No. | Cu % | Sn % | Pb % | Zn % | Other | Tensile (MPa) | Hardness (HB) | Application in Spade Terminals |
|---|---|---|---|---|---|---|---|---|---|
| LG2 / Gunmetal | C83600 | 85 | 5 | 5 | 5 | — | 240–290 | 60–85 | Standard external spade terminal; best corrosion resistance + machinability |
| LG4 Gunmetal | C83800 | 83 | 4 | 6 | 7 | — | 240–270 | 60–80 | Alternative to LG2; improved pressure tightness for enclosed bushing applications |
| Phosphor Bronze | C51000 | 94.8 | 5 | — | — | P 0.2 | 310–380 | 85–120 | High-load spade terminal for large power transformer bushing connections |
| Silicon Bronze | C65500 | 97 | — | — | — | Si 3, Mn 1 | 340–410 | 95–130 | Marine/coastal substation; offshore-grade spade connector |
| Aluminium Bronze | C95400 | 85 | — | — | — | Al 11, Fe 4 | 480–550 | 140–180 | High-temperature transformer terminal; EHV substation spade |
| Navy Bronze / Tin Bronze | C90500 | 88 | 10 | — | 2 | — | 260–310 | 70–90 | High-strength spade for switchgear and industrial transformer connections |
| Leaded Tin Bronze | C93200 | 83 | 7 | 7 | 3 | — | 220–270 | 60–80 | Free-machining grade for precision-dimensioned spade connectors |
| ETP Copper | C11000 | 99.9+ | — | — | — | — | 220–250 | 40–60 | Highest-conductivity spade for internal transformer connections |
International Material Equivalent Table
| Grade | USA (ASTM/UNS) | UK (BS) | Germany (DIN/EN) | Japan (JIS) | India (IS) | ISO |
|---|---|---|---|---|---|---|
| LG2 Bronze | C83600 / ASTM B505 | BS 1400 LG2 | Rg5 / CuSn5Pb5Zn5 | CAC406 | IS 318 LTB-2 | ISO 1338 CuSn5Pb5Zn5 |
| LG4 Bronze | C83800 / ASTM B505 | BS 1400 LG4 | CuSn4Pb6Zn7 | CAC407 | IS 318 | ISO 1338 CuSn4Pb6Zn7 |
| Phosphor Bronze | C51000 / ASTM B139 | BS 2870 PB102 | CW451K / CuSn5 | C5111 | IS 7811 | ISO 196 CuSn5 |
| Silicon Bronze | C65500 / ASTM B98 | BS 2870 CS101 | CW116C / CuSi3Mn | C6561 | — | ISO 196 CuSi3Mn |
| Aluminium Bronze | C95400 / ASTM B148 | BS 1400 AB2 | CuAl11Fe4 / CC333G | CAC702 | IS 305 | ISO 428 CuAl11Fe4 |
| Navy Bronze | C90500 / ASTM B505 | BS 1400 G1 | CuSn10Zn2 | CAC402 | IS 318 | ISO 1338 CuSn10Zn2 |
| Leaded Tin Bronze | C93200 / ASTM B505 | BS 1400 CT1 | CuSn7Pb7Zn3 | CAC603 | IS 318 | ISO 1338 CuSn7Pb7Zn3 |
| ETP Copper | C11000 / ASTM B187 | BS 1400 PB2 | CW004A / CuETP | C1100 | IS 191 | ISO 1337 Cu-ETP |
Product Types and Variants
| Product Type | Figure Config. | Material | Stud Thread Range | Finish | Application |
|---|---|---|---|---|---|
| Single-Hole Spade Terminal | Fig. 1 | LG2 / C83600 | 3/8″-16 to 1″-14 | Tin-plated, machined | Single busbar transformer takeoff |
| Two-Hole Spade Terminal | Fig. 2 | LG2 / C83600 | 3/8″-16 to 1″-14 | Tin-plated, machined | Dual busbar stud takeoff |
| Three-Hole Spade Terminal | Fig. 3 | LG2 / C83600 | 3/8″-16 to 1″-14 | Tin-plated, machined | Triple busbar bus connection |
| Four-Hole Spade Terminal | Fig. 4 | LG2 / C83600 | 3/8″-16 to 1″-14 | Tin-plated, machined | 4-bar busbar takeoff |
| Five-Hole Spade Terminal | Fig. 5 | LG2 / C83600 | 5/8″-11 to 1″-14 | Tin-plated, machined | 5-bar bus bar connection |
| Six-Hole Spade Terminal | Fig. 6 | LG2 / C83600 | 1″-14 | Tin-plated, machined | 6-bar heavy bus connection |
| Bonded Stud Spade (-SS) | Any Fig. | LG2 or custom alloy | 3/8″-16 to 1″-14 | Tin-plated + captive stud | Quick-install transformer bushing terminal |
| High-Current Spade (Al-Bronze) | Fig. 4-6 | C95400 Aluminium Bronze | 1″-14 and custom | Ni or Ag plated | EHV transformer 132-400 kV terminal |
| Silicon Bronze Coastal Grade | Any Fig. | C65500 Silicon Bronze | 3/8″-16 to 1″-14 | Tin-plated + sealed | Marine/coastal/offshore substation |
| Custom OEM Spade Connector | Custom | As specified | Custom | As required | Direct OEM replacement |
Applications in Industry
| Industry / Application | Product Used | Voltage Level | Notes |
|---|---|---|---|
| Power Utilities & Grid Substations | Multi-hole bronze spade terminal | 33 kV – 400 kV | Transmission transformer stud-to-busbar connection |
| Distribution Networks (Pad/Pole Transformers) | Two- and four-hole spade | 11 kV – 33 kV | LV/HV bushing stud vertical takeoff |
| Industrial Facilities (Steel, Mining, Cement) | Four-hole + Al-bronze spade | 11 kV – 132 kV | Captive power transformer terminals |
| Renewable Energy (Solar/Wind Farm) | Standard + coastal grade spade | 33 kV – 132 kV | Step-up transformer bushing connection |
| Switchgear and MV/LV Panels | Fig. 1-3 spade terminal | Up to 36 kV | Bus bar takeoff in switchgear cubicles |
| Railway Traction Substations | Custom copper/bronze spade | 25 kV AC / 1.5 kV DC | Traction transformer spade fitting |
| EPC / Turnkey Projects | Custom OEM spade connector | As designed | Full project bulk supply with documentation |
| Transformer OEM Manufacturing | All types to OEM drawing | All ratings | Factory-fitted internal and external spades |
| Repair & Maintenance (Transformer Refurbishment) | Standard + custom spade | All ratings | Drop-in replacement for worn/damaged terminals |
Manufacturing Process
Conex Casting produces bronze transformer spade terminals through a quality-controlled foundry and machining process. The process begins with certified raw material intake — LG2 bronze ingot (ASTM B505) or alternative alloy as specified — tested by OES spectrometer for chemical compliance before charging. For gravity die casting, permanent steel dies are pre-heated to 250-300°C and the melt is poured at 980-1050°C (bronze) under controlled conditions to eliminate shrinkage porosity and gas inclusions. For larger and complex spade configurations, sand casting (green sand or shell mold) provides the dimensional flexibility required. After solidification and shakeout, castings undergo shot blasting and CNC machining of all mating faces, holes, and thread features to drawing tolerances (ISO 2768 medium or better). External-duty spade terminals pass to the electroplating line for tin plating (alkaline or methane sulfonate bath, 10-25 µm per ASTM B545). Each spade terminal is stamped with heat number, alloy grade, and Conex batch code for full traceability. Final inspection includes dimensional check (CMM or gauge), Brinell hardness, visual inspection, plating thickness (eddy-current gauge), and contact resistance measurement before packaging.
Quality Standards and Certifications
| Standard / Certification | Scope |
|---|---|
| ISO 9001:2015 | Quality management system — foundry and machining operations |
| ASTM B505 | Copper alloy continuous castings specification (LG2, C83600 etc.) |
| ASTM B545 | Tin plating specification for electrodeposited coatings |
| ASTM B117 | Salt spray (fog) testing for corrosion resistance |
| IEC 60076-1 | Power transformers — general requirements (accessories) |
| ANSI C57.12 | Standard for distribution, power and regulation transformers |
| BS 1400 LG2 | British Standard — leaded gunmetal casting alloy |
| IS 318 | Indian Standard — leaded tin bronzes and gunmetals for castings |
| EN 10204 (3.1 / 3.2) | Material Test Certificate — manufacturer or third-party certified |
| RoHS Compliant | Restriction of Hazardous Substances (Pb-free alloys available on request) |
Why Choose Conex Casting for Bronze Transformer Spade Terminals?
| Factor | Conex Casting Capability |
|---|---|
| Experience | Decades of specialization in bronze and copper electrical castings for the global power sector |
| Alloy Range | Full range: LG2, LG4, Phosphor Bronze, Silicon Bronze, Aluminium Bronze, ETP Copper |
| Custom Engineering | Pattern development, OEM reverse engineering, prototype-to-production in 4-6 weeks |
| Certification | ISO 9001:2015; EN 10204 3.1/3.2 MTCs available; third-party inspection accepted |
| Price | US$ 15.90/Kilo, CIF US Port — competitive ex-works India pricing for global export |
| Global Supply | Exports to USA, UK, Europe, Middle East, Africa, Southeast Asia, Australia |
| Lead Time | Standard: 3-5 weeks; Express: 2 weeks with tooling on hand |
| Min. Order Qty. | Low MOQ for trials; volume pricing for OEM programs |
| Traceability | Full batch traceability — heat number, OES analysis, dimensional records per EN 10204 |
| Stud Bonding Option | Studs bonded to terminal (-SS suffix) with locking set screws available on all sizes |
Frequently Asked Questions
Q1: What is a bronze transformer spade terminal and where is it used?
A bronze transformer spade terminal is a flat-tab bronze casting with a central stud hole used to connect a transformer bushing stud to vertical bus bars. It is used in distribution transformers, power transformers, substations, and switchgear for stud-to-busbar electrical takeoff connections. Conex Casting produces these per NEMA spacing standards for global transformer OEM applications.
Q2: What alloy is used for standard bronze transformer spade terminals?
Standard Conex Casting transformer spade terminals are cast from LG2 bronze (C83600 / BS 1400 LG2) — a high copper content alloy comprising approximately 85% copper with tin, lead, and zinc. For high-temperature or EHV applications, aluminium bronze (C95400) or silicon bronze (C65500) are available. ETP copper (C11000) is used for internal transformer spade connections requiring maximum electrical conductivity.
Q3: What stud thread sizes do your transformer spade terminals accommodate?
Conex Casting’s transformer spade terminals cover stud thread sizes from 3/8″-16 UNC through 1″-14 UNC as standard catalog sizes. The stud hole is 9/16″ (14.3 mm) diameter with 1-3/4″ NEMA spacing. Custom stud hole diameters and metric equivalents are available on request.
Q4: Can the spade terminals be supplied with studs already bonded to the connector?
Yes. Conex Casting can supply transformer spade terminals with studs pre-bonded to the terminal by adding suffix “-SS” to the catalog number. One stud locking set screw is provided on all standard sizes. For sizes where dimension “A” equals 1-14, two stud locking set screws are provided. This eliminates loose hardware during field installation.
Q5: What is the difference between Fig. 1 through Fig. 6 configurations?
The figure numbers (Fig. 1 through Fig. 6) indicate the number of bus bar mounting holes on the spade tab in NEMA spacing configuration. Fig. 1 is a single-hole design for single bus bar takeoff; Fig. 2 through Fig. 6 provide two through six mounting holes for connection to multiple bus bars simultaneously. The choice depends on the transformer rating and bus bar configuration at the installation site.
Q6: Are your transformer spade connectors compatible with aluminium bus bars?
Yes. Conex Casting’s bronze transformer spade terminals are designed for use with both aluminium and copper compression or bolted type conductor lugs. When used with aluminium bus bars, a suitable bimetallic washer or anti-oxidant compound is recommended to prevent galvanic corrosion at the aluminium-bronze interface.
Q7: What plating options are available for transformer spade terminals?
Standard: Electrodeposited tin (10-25 µm per ASTM B545). Additional options: Hot-dip tin coating, electroless nickel plating (ENP, 25-75 µm), and silver plating (5-25 µm) for GIS switchgear, high-temperature bushing, or offshore/marine substation applications. Unplated machined bronze is also available for internal or specially coated applications.
Q8: What is the price of Conex Casting bronze transformer spade terminals?
US$ 15.90/Kilo, CIF US Port for standard LG2 bronze transformer spade terminals. Pricing for other alloy grades is available on request. Volume and project pricing available for OEM programs. Contact Conex Casting for a formal quotation.
Q9: What lead time should I expect for transformer spade terminal orders?
For standard catalog sizes in stock alloy: 3-5 weeks from order confirmation. For custom-engineered or new pattern sizes: 4-6 weeks from drawing approval. Express production (2 weeks) is possible for existing patterns with prior notice. Sea freight to USA/Europe typically adds 2-3 weeks; air freight 3-5 days.
Q10: Can Conex Casting supply material test certificates for spade terminal orders?
Yes. Material Test Certificates (MTC) per EN 10204 Type 3.1 (manufacturer-certified) and Type 3.2 (third-party certified) are available. Each MTC includes OES chemical composition analysis, Brinell hardness, tensile properties, and tin plating thickness confirmation. Third-party inspection (SGS, BV, TUV) is accepted and can be arranged at the buyer’s cost.
Related Products — Electrical Castings by Conex Casting
Explore our complete range of electrical casting products in the same category:
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Linked Terms and Parts
Bronze transformer spade terminals are related to the following components and technical terms: transformer spade connector, bushing stud connector, busbar spade terminal, transformer terminal lug, transformer bushing pad, substation spade fitting, stud takeoff connector, vertical busbar connector, NEMA spade terminal, transformer bushing fitting, LG2 bronze casting, C83600 bronze connector, transformer terminal pad, busbar takeoff terminal, power transformer spade, distribution transformer connector, transformer bus fitting, bolted bus connector, electroplated transformer terminal, tin-plated spade connector, bronze electrical casting, copper alloy transformer terminal, compression lug spade, transformer stud assembly, bonded stud spade terminal, IEC transformer accessory, ANSI C57.12 spade connector, transformer OEM terminal, cast bronze electrical fitting, electrical substation bronze casting.
Request a Quote for Bronze Transformer Spade Terminals
In Stock & Made to Order | US$ 15.90/Kilo, CIF US Port | ISO 9001:2015 Certified | MTCs Available | Ships Worldwide