Bronze Transformer Spade Connectors and Transformer Spade Terminals are mission-critical electrical connection components used in power transformers, distribution transformers, substations, switchgear, and heavy-duty electrical equipment. We are one of the leading manufacturers and exporters from India. We have been supplying Bronze and Copper Transformer Spade Connectors and Terminals to the world market for many decades. Our products are engineered for high current carrying capacity, low contact resistance, mechanical robustness, and long service life, even under severe thermal and environmental conditions.
With over three decades of global manufacturing and export experience, our transformer spade terminals are trusted by OEMs, utilities, EPC contractors, and panel builders across the USA, Canada, Europe, UK, Australia, and the Middle East. Every connector we produce reflects strong E-E-A-T principles (Experience, Expertise, Authoritativeness, Trustworthiness)—from alloy selection and process control to inspection, documentation, and after-sales technical support. We focus on NEMA spacing compliance, international material standards, tight tolerances, and reliable turnaround times (4–6 weeks) to support critical power infrastructure projects.
Product Types & Technical Descriptions
Bronze Transformer Spade Connectors
Bronze transformer spade connectors are preferred for high-load transformer connections where strength, conductivity, and resistance to stress relaxation are required. Typically manufactured from High-Strength Copper-Bronze and Aluminium Bronze alloys, these spade connectors provide superior mechanical integrity compared to pure Copper while maintaining excellent electrical performance. They are widely used on HV/LV transformer bushings, busbar terminations, and outdoor substations where vibration, heat cycling, and oxidation resistance are essential.
Transformer Spade Terminals
Transformer spade terminals are flat, fork-type electrical terminals designed to fit over transformer bushing studs or bolts. Our transformer spade terminals are precision-machined to ensure uniform contact pressure, optimal surface flatness, and reliable torque retention. Available in standard and custom thicknesses, they are suitable for oil-filled transformers, dry-type transformers, and distribution panels. We manufacture spade terminals to customer drawings, NEMA standards, and utility-specific specifications.
NEMA Spaced Copper Terminals
NEMA spaced Copper terminals are engineered to meet North American dimensional spacing and mounting requirements, ensuring compatibility with transformer bushings and bus systems used across the USA and Canada. Manufactured from High-Conductivity Copper (ETP, OFHC, or equivalent), these terminals offer maximum current flow with minimal I²R losses. Precision spacing reduces installation errors and ensures repeatability in large-scale transformer production.
Tin Plated Copper Spades for Transformer Bushings
Tin plated Copper spades are designed to prevent oxidation, reduce fretting corrosion, and enhance long-term electrical stability. The electrolytic Tin plating provides excellent solderability and compatibility with Aluminium or Copper mating surfaces. These spades are widely used in coastal, humid, and industrial environments, where bare Copper may oxidize over time.
Materials & International Grades (Global Coverage)
| Region | Common Grades |
| USA (ASTM / SAE) | ASTM B152 C11000, C10200, ASTM B505 C84400, ASTM B148 C95400, C95500 |
| Europe (EN / DIN) | EN CW004A, CW008A, CW009A, CuSn12, CuAl10Ni5Fe4 |
| India (IS) | IS 191, IS 613, IS 318 |
| UK (BS) | BS 2872, BS 1400 PB2 |
| Japan (JIS) | JIS C1100, C1020, CAC702 |
| China (GB) | T2 Copper, QSn6.5-0.1, QAl9-4 |
All materials are sourced with Mill Test Certificates (MTCs) and verified for chemical composition, conductivity, and mechanical properties.
Manufacturing Processes & Machinery
Our Bronze Transformer Spade Connectors and Copper Spade Terminals are produced using a combination of Gravity Die Casting, Continuous Casting, Precision CNC Machining, and High-Speed Milling. Secondary operations include drilling, slotting, deburring, surface finishing, and controlled plating.
Key machinery includes CNC VMCs, Horizontal Machining Centers, Power Presses, Hydraulic Presses, Thread Rolling Machines, and Automated Plating Lines. This ensures dimensional consistency, scalability, and repeatability across production batches.
Typical Parts Produced
Transformer spade terminals, fork terminals, bushing connectors, flat Copper spades, Bronze spade connectors, busbar transition spades, customized high-current terminals, and NEMA spaced transformer connectors for utility transformers.
Plating & Surface Finish
Tin Plated, Silver Plated (on request), Nickel Flash, Natural Copper/Bronze Finish, Anti-Tarnish Coating. Plating thickness typically 5–15 microns as per ASTM B545 / customer specification.
Industries & Applications
Power Transformers, Distribution Transformers, Renewable Energy Transformers, Substations, Switchgear, Electrical Utilities, Rail Electrification, Data Centers, Heavy Electrical OEMs.
Performance Metrics
High current density, low contact resistance, excellent thermal conductivity, stable performance under cyclic loading, corrosion resistance, long service life exceeding 25+ years in normal operating conditions.
Why Choose Our Transformer Spade Connectors
Customers choose us for faster turnaround (4–6 weeks), flexible production volumes, deep engineering expertise, proactive drawing optimization support, customized packaging with logos/labels, and three decades of global export experience. Our communication is clear, responsive, and technically grounded—highly valued by US-based OEMs.
Quality & Inspection
Dimensional inspection, conductivity testing, visual and surface finish checks, plating thickness verification, and traceable documentation as per ISO-based systems.
Typical Q & A (Keyword-Rich)
Q1. Are these transformer spade connectors suitable for high current applications?
Yes, they are designed for high current transformer and substation use.
Q2. Do you manufacture NEMA spaced Copper terminals for the USA market?
Yes, NEMA spacing is a core specialization for us.
Q3. Can you customize spade terminals as per drawings?
Absolutely, custom drawings and revisions are our strength.
Q4. What plating is best for outdoor transformers?
Tin plating is commonly recommended for outdoor environments.
Q5. Do you supply Bronze spade connectors for heavy duty loads?
Yes, Aluminium Bronze and Copper-Bronze grades are available.
Q6. What is your standard lead time?
Our standard turnaround time is 4–6 weeks.
Q7. Are your materials ASTM compliant?
Yes, ASTM, EN, IS, DIN, and JIS grades are supported.
Q8. Can you supply small prototype quantities?
Yes, prototypes and pilot lots are welcome.
Q9. Do you export to the USA regularly?
Yes, the USA is one of our primary markets.
Q10. Are Mill Test Certificates provided?
Yes, MTCs are supplied with shipments.
Q11. Can you suggest design improvements?
Our engineering team actively supports design optimization.
Q12. What tolerances can you achieve?
Typical tolerances range from ±0.05 mm to ±0.15 mm.
Q13. Is custom branding on packaging possible?
Yes, private labeling and branding are available.
Q14. Do you support long-term supply contracts?
Yes, we support annual and multi-year contracts.
Q15. Are these suitable for renewable energy transformers?
Yes, widely used in solar and wind transformer systems.
Customer Testimonials
John M., Electrical OEM, USA
“The consistency and communication from this supplier are exceptional. Their NEMA spaced Copper spade terminals fit perfectly every time.”
David R., Utility Contractor, USA
“Excellent Bronze transformer spade connectors with reliable lead times. Engineering support was a big plus.”
Glossary of Terms
Spade Terminal: Flat fork-type electrical connector used on studs.
NEMA Spacing: North American standard spacing for electrical connections.
Tin Plating: Electrolytic coating to prevent Copper oxidation.
Bronze Alloy: Copper-based alloy with enhanced strength and durability.
| Bronze Transformer Spade Terminals | ||||||||
|---|---|---|---|---|---|---|---|---|
| Reference Number | Figure Number | Approximate Dimensions | ||||||
| A | B | C | D | L | T | W | ||
| CC-1 | 1 | 3/8 – 16 | 0.88 | 0.63 | 2.38 | 4 | 0.25 | 3.5 |
| CC-2 | 2 | 3/8 – 16 | 0.88 | 0.75 | 3.5 | 5.06 | 0.31 | 1.38 |
| CC-3 | 3 | 3/8 – 16 | 0.88 | 0.63 | 4.13 | 5.75 | 0.25 | 3.5 |
| CC-4 | 5 | 3/8 – 16 | 0.88 | 0.75 | 6.81 | 8.38 | 0.31 | 1.38 |
| CC-5 | 1 | 1/2 – 13 | 0.88 | 0.63 | 2.38 | 4 | 0.25 | 3.5 |
| CC-6 | 2 | 1/2 – 13 | 0.88 | 0.75 | 3.5 | 5.06 | 0.31 | 1.38 |
| CC-7 | 3 | 1/2 – 13 | 0.88 | 0.63 | 4.13 | 5.75 | 0.25 | 3.5 |
| CC-8 | 5 | 1/2 – 13 | 0.88 | 0.75 | 7 | 8.38 | 0.31 | 1.38 |
| CC-9 | 1 | 5/8 – 11 | 0.88 | 0.63 | 2.38 | 4 | 0.25 | 3.5 |
| CC-10 | 2 | 5/8 – 11 | 0.88 | 0.75 | 3.5 | 5.06 | 0.31 | 1.38 |
| CC-11 | 3 | 5/8 – 11 | 0.88 | 0.63 | 4.13 | 5.75 | 0.25 | 3.5 |
| CC-12 | 5 | 5/8 – 11 | 0.88 | 0.75 | 7 | 8.38 | 0.31 | 1.38 |
| CC-13 | 1 | 1 – 14 | 1.38 | 0.63 | 2.38 | 4 | 0.38 | 3.5 |
| CC-14 | 2 | 1 – 14 | 1.38 | 0.75 | 3.56 | 5.13 | 0.34 | 1.94 |
| CC-15 | 3 | 1 – 14 | 1.38 | 0.63 | 4.13 | 5.75 | 0.38 | 3.5 |
| CC-16 | 5 | 1 – 14 | 1.44 | 0.75 | 7.06 | 9.44 | 0.34 | 1.94 |
| CC-17 | 4 | 1 – 14 | 1.38 | 0.63 | 5.13 | 6.69 | 0.38 | 3.5 |
| CC-18 | 6 | 1 – 14 | 1.38 | 0.63 | 6.88 | 9.44 | 0.38 | 3.5 |