Sparky's Journal

📅 July 25th, 2026

⚡ Sparky's Journal: Connectors, Screws, Bolts & Clamps Every Electrician Should Know

Walk onto any commercial or residential jobsite and you'll quickly realize that electricians don't just work with wire—we work with hundreds of different fasteners, connectors, and support hardware.

Knowing the difference between a connector, coupling, clamp, anchor, or bolt can save time, improve installation quality, and help ensure your work meets code and manufacturer requirements.

Here's a breakdown of many of the most common hardware items electricians encounter.

🔌 Electrical Connectors

Electrical connectors secure conductors or raceways while protecting wiring from damage.

Common examples include:

• NM cable connectors

• MC cable connectors

• AC cable connectors

• Flexible metal conduit (FMC) connectors

• Liquidtight connectors

• EMT compression connectors

• EMT set-screw connectors

• Rigid conduit threaded connectors

• PVC male adapters

• Cord grips (strain relief connectors)

• Service entrance connectors

• Weatherproof connectors

• Grounding bushings

• Insulated throat connectors

• Myers hubs

These are used when entering boxes, panels, disconnects, enclosures, or equipment.

🔄 Couplings

Couplings join two sections of conduit together.

Common types include:

• EMT set-screw coupling

• EMT compression coupling

• Rigid threaded coupling

• PVC coupling

• Expansion coupling

• Flexible conduit coupling

• Liquidtight coupling

• Reducing coupling

🛠️ Clamps

Clamps secure cable, conduit, or equipment.

Examples include:

• One-hole strap

• Two-hole strap

• Conduit clamp

• Beam clamp

• C-clamp

• Ground clamp

• Pipe clamp

• Split-ring hanger

• Minerallac clamp

• Cushioned clamp

• Cable clamp

• Service cable clamp

• Romex clamp

• MC cable strap

🔩 Bolts

Bolts provide strong structural fastening.

Common types include:

• Hex bolt

• Carriage bolt

• Elevator bolt

• Lag bolt

• Machine bolt

• Structural bolt

• Anchor bolt

• U-bolt

• Eye bolt

• J-bolt

• Shoulder bolt

Often paired with washers and locknuts.

🔧 Screws

Every electrician uses dozens of screw styles.

Common examples include:

Sheet Metal Screws

• Self-tapping

• Self-drilling (Tek screws)

• Hex washer head

• Pan head

• Flat head

• Truss head

Machine Screws

• 6-32

• 8-32

• 10-24

• 10-32

• 1/4-20

Wood Screws

Used for mounting boxes, supports, and equipment to wood framing.

Concrete Screws

• Tapcon screws

• Masonry screws

Used for fastening equipment directly into concrete or block.

🪛 Anchors

When fastening into masonry or drywall, anchors are essential.

Common types include:

• Wedge anchors

• Sleeve anchors

• Drop-in anchors

• Strike anchors

• Hammer-set anchors

• Concrete screws

• Lead anchors

• Plastic expansion anchors

• Toggle bolts

• Molly bolts

• Snaptoggle anchors

⚙️ Nuts

Nuts secure bolts and threaded rod.

Common examples include:

• Hex nut

• Lock nut

• Nylon insert lock nut

• Wing nut

• Coupling nut

• Square nut

• Keps nut

• Jam nut

⚪ Washers

Washers distribute load and prevent loosening.

Common types include:

• Flat washer

• Fender washer

• Split lock washer

• External tooth lock washer

• Internal tooth lock washer

• Belleville washer

• Sealing washer

📏 Threaded Rod Hardware

Frequently used for trapeze supports and hanging conduit.

Includes:

• Threaded rod

• Rod couplings

• Rod hangers

• Beam clamps

• Spring nuts

• Channel nuts

• Square washers

🏗️ Strut Hardware

A commercial electrician's best friend.

Common hardware includes:

• Strut channel

• Spring nuts

• Channel nuts

• Flat plate fittings

• Angle brackets

• Corner brackets

• T-fittings

• Cross fittings

• Beam clamps

• Pipe clamps

• Conduit clamps

• Roller supports

• End caps

⚡ Grounding Hardware

Grounding requires specialized connectors.

Examples include:

• Ground lugs

• Split bolts

• Lay-in lugs

• Irreversible compression connectors

• Ground rod clamps

• Bonding bushings

• Bonding jumpers

• Ground bars

• Mechanical lugs

📦 Cable Support Hardware

Supporting cables properly is critical for a safe installation.

Examples include:

• J-hooks

• Bridle rings

• Cable ties

• Stainless steel ties

• D-rings

• Cable hangers

• Loop hangers

• Batwing clips

• Beam clips

• Caddy clips

Commercial-Specific Hardware

On commercial jobs, you'll frequently encounter:

• Sammy screws

• Beam clamps

• Purlin clips

• Rod couplers

• Trapeze assemblies

• All-thread rod

• Strut straps

• Conduit hangers

• Kindorf fittings

• Spring steel fasteners

Final Thoughts

The average electrician handles far more than wire and conduit. Every installation depends on choosing the right connector, clamp, screw, bolt, anchor, or support hardware for the application.

Learning these components—and understanding when and why to use them—is an important step toward becoming a well-rounded electrician. While wiring methods may change from one project to another, the fundamentals of proper fastening, supporting, and securing electrical systems remain constant throughout the trade.

The more familiar you become with these parts, the faster you'll work, the cleaner your installations will look, and the more confidence you'll have tackling everything from residential service calls to large commercial projects.

— Josh The Sparky