Bronze Transformer Spades, Transformer Spade Connectors

Heavy-Duty Bronze Spade Terminals with 1-3/4″ NEMA Spacing (2 to 12 Hole Configurations)

Bronze Transformer Spades are high-strength electrical connectors designed for secure termination of conductors in power transformers, distribution transformers, substations, and switchgear assemblies. Engineered for high-current applications, these bronze spade terminals combine excellent mechanical strength, corrosion resistance, and reliable conductivity for long service life in demanding electrical environments.

Available in multiple Bronze alloys, tin plated or natural finish, and manufactured with precise 1-3/4 inch NEMA spacing, our Bronze Transformer Spades are widely used by transformer OEMs, EPC contractors, and utility infrastructure projects.

Product Overview

Bronze Transformer Spades — also known as:

• Bronze Transformer Spade Terminals
• Bronze Transformer Spade Connectors
• Bronze Busbar Spades
• Bronze Bushing Spades
• Heavy Duty Bronze Electrical Spades

These components provide a flat, bolted interface between transformer bushings, conductors, and busbars. Designed to handle high electrical loads and mechanical torque, they ensure secure and stable connections in critical power systems.

Bronze Alloys Used

We manufacture Bronze Transformer Spades in various high-performance alloys depending on application requirements:

Phosphor Bronze (C51000 / PB1)

• Good electrical conductivity
• High fatigue resistance
• Excellent wear properties
• Suitable for medium-current transformer terminations

Aluminum Bronze (C95400 / C95800)

• High tensile strength
• Superior corrosion resistance
• Excellent for heavy-duty transformer connectors
• Ideal for industrial and coastal environments

Silicon Bronze (C65500)

• Strong mechanical performance
• High resistance to oxidation
• Suitable for outdoor substations

Gunmetal Bronze (LG2 / C83600)

• Excellent casting characteristics
• Good machinability
• Balanced conductivity and strength
• Common in transformer bushings and electrical connectors

Custom Bronze compositions can be supplied as per ASTM, BS, DIN, IS, or customer specifications.

NEMA Hole Configurations – 1-3/4″ Standard Spacing

Our Bronze Transformer Spades are manufactured with standard NEMA 1-3/4 inch (44.45 mm) center-to-center spacing, ensuring compatibility with transformer bushings and power distribution systems.

Available Hole Patterns

• 2 Hole NEMA Spacing – 1-3/4″
• 4 Hole NEMA Spacing – 1-3/4″
• 6 Hole NEMA Spacing – 1-3/4″
• 8 Hole NEMA Spacing – 1-3/4″
• 12 Hole NEMA Spacing – 1-3/4″

Technical NEMA Specifications

Parameter	Specification
Center-to-Center Spacing	1-3/4 inch (44.45 mm)
Hole Quantity	2, 4, 6, 8, 12
Hole Diameter	As per bolt size (customizable)
Bolt Compatibility	1/4″, 3/8″, 1/2″, 5/8″, M8, M10, M12, M16
Tolerance	±0.1 mm CNC controlled
Slotting	Available on request

Accurate 1-3/4″ NEMA spacing ensures:

• Proper bushing alignment
• Even torque distribution
• Lower contact resistance
• Reduced overheating risk
• Easy interchangeability

Tin Plated Bronze Transformer Spades

Tin plating is available to enhance corrosion resistance and electrical performance.

Benefits of Tin Plating

• Prevents surface oxidation
• Improves conductivity stability
• Reduces contact resistance
• Suitable for humid & coastal installations
• RoHS compliant

Plating Options

• Electro tin plating
• Hot dip tin coating
• Thickness range: 5–15 microns (customizable)

Other finishes available:

• Natural Bronze finish
• Silver plated Bronze spades (on request)
• Nickel plating for specific applications

Manufacturing Process

Bronze Transformer Spades are manufactured through:

1. Bronze Sand Casting / Gravity Casting
2. CNC Precision Machining
3. Drilling & Slotting with 1-3/4″ NEMA spacing
4. Surface Finishing / Tin Plating
5. Dimensional & Quality Inspection

All parts undergo strict inspection for:

• Flatness
• Hole alignment
• Chemical composition
• Surface finish
• Plating thickness

Technical Specifications

Property	Details
Material	Phosphor Bronze / Aluminum Bronze / Silicon Bronze / Gunmetal
Conductivity	15–35% IACS (alloy dependent)
Tensile Strength	350–700 MPa
Thickness	3 mm – 25 mm (custom available)
Width	As per design
Surface Finish	Natural / Tin Plated / Silver Plated
Hole Pattern	2–12 hole NEMA (1-3/4″)
Application	Transformer bushings, busbars, substations

Why Choose Bronze Transformer Spades?

Compared to pure copper, bronze offers:

• Higher structural strength
• Better resistance to deformation
• Superior corrosion resistance
• Longer service life
• Improved mechanical reliability under bolted torque

For high-current transformer terminations, bronze provides a strong balance between conductivity and durability.

Typical Applications

• Oil-filled transformers
• Dry-type transformers
• Substation busbar connections
• Power distribution panels
• Renewable energy installations
• Utility infrastructure projects

Customization Options

We offer:

• Custom alloy selection
• Custom hole diameters
• 2 to 12 hole NEMA configurations
• Special plating thickness
• Laser marking
• OEM branding
• Export packaging