Transformer Spade Terminals, Bronze Transformer Spades, Transformer Spade Connectors
Bronze Transformer Spade Terminals
Transformer Spade Connectors | Transformer Spade Spade Terminals
Bronze Transformer Spade Terminals, also known as Transformer Spade Connectors or Transformer Spade Terminals, are heavy-duty electrical connectors used to terminate copper or aluminum conductors onto transformer bushings and terminal pads. These components are widely used in distribution and power transformers, substations, and high-current electrical systems.
Our transformer spades are cast from high-strength Bronze alloys and precision-machined to meet NEMA hole spacing and dimensional requirements, ensuring reliable mechanical strength, electrical conductivity, and long-term corrosion resistance in outdoor and utility environments.
Product Overview
Transformer spade terminals are typically secured to a transformer bushing stud using a jam nut and provide a flat NEMA-patterned , NEMA Spaced pad for mounting cable lugs. They are recommended where copper or aluminum lugs must be connected to transformer bushings or terminal pads.
Key Features
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Cast Bronze construction for high mechanical strength
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CNC-machined pad and hole locations
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NEMA-standard hole spacing
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Suitable for single-lug or stacked-lug configurations
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Tin-plated surface for corrosion protection and stable contact resistance
Materials & Finish
Base Material
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High-strength Bronze alloys (Nickel Aluminum Bronze / Tin Bronze variants as per application)
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Typical grades include high-strength utility-approved Bronze alloys equivalent to C95500 / C95800 family
Surface Finish
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Tin-plated Bronze (standard)
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Bare Bronze or special plating available on request
Hardware
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Jam nut typically supplied by transformer OEM
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Optional factory-fitted Brass jam nut available (suffix “-JN”)
Manufacturing Process
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Bronze alloy melting with controlled chemistry
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Precision casting for sound internal structure
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CNC machining for pad flatness, hole spacing, and stud fit
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Deburring and edge finishing
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Tin plating and optional anti-tarnish treatment
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Final dimensional and visual inspection
Technical Specifications
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Standards: NEMA hole spacing and pad layouts
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Stud Sizes: 5/8″-11, 1″-14, 1-1/4″-12 (others on request)
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Hole Patterns: 2-hole, 4-hole, multi-hole NEMA patterns
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Typical Tolerances:
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Hole spacing: ±0.010 in (±0.25 mm)
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Thickness: ±0.010 in (±0.25 mm)
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Environment: Outdoor utility, coastal, industrial atmospheres
Standard Bronze Transformer Spade Terminals
(New Part Number Series)
| Conex Part No. | Bushing Stud Size | Pad / Lug Pattern | NEMA Spacing (in) | Length (in / mm) | Width (in / mm) | Thickness (in / mm) | Finish | Approx. Weight |
|---|---|---|---|---|---|---|---|---|
| CNX-BXS-052-58 | 5/8″-11 | 2-hole pad (single lug) | 1.75 | 5.12 / 130 | 1.33 / 35 | 0.31 / 8 | Tin-plated | 0.70 lb |
| CNX-BXS-056-10 | 1″-14 | 2-hole pad (single lug) | 1.75 | 5.06 / 129 | 1.33 / 35 | 0.34 / 9 | Tin-plated | 0.94 lb |
| CNX-BXS-085-58 | 5/8″-11 | 4-hole pad | 1.75 | 8.50 / 216 | 1.33 / 35 | 0.31 / 8 | Tin-plated | 1.20 lb |
| CNX-BXS-085-10 | 1″-14 | 4-hole pad | 1.75 | 8.50 / 216 | 1.33 / 35 | 0.34 / 9 | Tin-plated | 1.35 lb |
| CNX-BXS-054-58W | 5/8″-11 | Wide 2-hole pad | 1.75 | 5.37 / 136 | 3.50 / 89 | 0.25 / 6 | Tin-plated | 1.32 lb |
| CNX-BXS-070-58W | 5/8″-11 | 3-set NEMA holes | 1.75 | 7.00 / 178 | 3.50 / 89 | 0.37 / 9 | Tin-plated | 3.00 lb |
| CNX-BXS-084-58W | 5/8″-11 | 4-set NEMA holes | 1.75 | 8.37 / 213 | 3.50 / 89 | 0.37 / 9 | Tin-plated | 3.30 lb |
| CNX-BXS-140-14XL | 1-1/4″-12 | 6-set NEMA holes | 1.75 | 14.00 / 356 | 4.00 / 102 | 0.50 / 13 | Tin-plated | 9.70 lb |
| CNX-BXS-175-14XXL | 1-1/4″-12 | 8-set NEMA holes | 1.75 | 17.50 / 445 | 4.00 / 102 | 0.50 / 13 | Tin-plated | 13.00 lb |
Options
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Suffix -JN → Factory-fitted Brass jam nut
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Suffix -MS → Mounting / support stud provision
Typical Applications
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Distribution transformers
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Power transformers
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Substations and switchyards
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Generator step-up transformers
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High-current bolted electrical connections
Why Choose Our Bronze Transformer Spade Terminals
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End-to-end control from Bronze casting to machining
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NEMA-compliant layouts with customization capability
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High mechanical strength and corrosion resistance
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Consistent quality and repeatability
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Typical lead time: 4–6 weeks
Frequently Asked Questions
Are these transformer spade terminals NEMA compliant?
Yes. All standard parts follow common NEMA hole spacing. Custom layouts can be made to customer drawings.
Why use Bronze instead of copper?
Bronze provides higher mechanical strength and superior corrosion resistance in outdoor and utility service.
Do you support custom designs?
Yes. Pad size, thickness, hole pattern, stud size, and finish can be customized.
Is tin plating standard?
Yes. Tin plating is standard; other finishes available on request.
Updated: December 2025-2026
