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Industries · Power Transmission

The grid, bolted together.

Tower steel, substation hardware, and transmission pole bolting — galvanized and ready to string.

Every mile of 500kV line sits on thousands of galvanized bolts, shackles, and insulator hardware. Every substation A-frame is bolted, not welded. We supply the hardware that carries the load — plus the pole-line accessories you’re tired of sourcing from three different vendors.

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Transmission towers · Substations · Distribution

High-voltage transmission tower against dusk sky

Industry Overview

Hot-dip galvanized, from foundation to conductor.

Transmission hardware lives outside for 50 years. That means G185 or 2.5oz/ft² hot-dip, ASTM F2329 processing, and strict control of hydrogen embrittlement on the high-strength stuff — the kind of detail that shows up in a utility spec book or approved materials list.

We run A394 tower bolts, F3125 A325/A490 substation hardware, and full pole-line inventory — shackles, thimble-eyes, step bolts, guy hardware — all HDG to utility spec and test-documented.

Products engineered for power transmission.

05 · Core product lines

A394 Tower Bolts

Type 0, 1, and 3 transmission tower bolting with locknuts and step nuts, G185 galvanized.

Substation Hardware

A325/A490 bolting for dead-end A-frames, switch structures, and bus support stands.

Pole-Line Accessories

Step bolts, guy hooks, thimble-eyes, shackles, and anchor rods — utility-spec galvanized.

Transmission Anchors

F1554 Gr 55/105 anchor cages and stub angles for lattice tower foundations.

Custom Utility Hardware

Obsolete pattern bolts, replacement cross-arm hardware, and specialty substation connectors.

Shop by Product

Fastener lines most used in Power Transmission.

Structural Bolts

A325, A490, TC bolts

Anchor Bolts

F1554 · headed, bent, rod

Industrial Fasteners

A193, Gr 5/8, heavy hex

Custom Products

Built to your print

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Case Studies

Power transmission fasteners in action.

Case 01

California utility line rebuild.

Problem

A California utility rebuilding a wildfire-affected transmission line needed A394 tower bolts across 38 lattice structures, staged to a regional assembly yard on a rolling schedule.

Solution

We ran the galvanizing in two production lots to match the construction sequence and shipped to the yard by tower-structure number.

Results

All 38 structures released to assembly crews with the right bolt counts. No yard ran short, no truck ran back.

“Staging tower bolts by structure number is the work most suppliers won't do. They just did it.”

— Construction Manager, California transmission utility

Case 02

California coastal substation rebuild.

Problem

A California coastal substation needed A325 bolting with HDG + Xylan duplex coating to survive salt-fog exposure and meet a utility-specific corrosion spec.

Solution

We hot-dip galvanized to F2329, then Xylan-topcoated in-house, with salt-spray test certs on each lot against the utility approved-materials list.

Results

Project closed out with all bolting accepted on first inspection. The utility added the duplex coating to their approved spec.

“Duplex coating on A325 isn't off-the-shelf. They built the process and got it through our corrosion review.”

— Standards Engineer, California utility

Specification Library

ASTM · SAE · ANSI · ISO

GRADEDESCRIPTIONPDF

A193 B7Alloy steel bolting, high-temp→

A193 B8M316 stainless bolting→

A325Structural bolts, heavy hex→

F1554 55Anchor bolts, 55 ksi yield→

F593Stainless cap screws→

B18.2.1Square & hex bolts dim.→

SAE J429Mech. properties — Grade 5/8→

ISO 898-1Carbon/alloy metric properties→

Resources

Visit our Specification Library.

A comprehensive resource for fastener specifications across the various industries we service. These guides offer access to a wide array of specifications, standards, and technical resources.

Open Spec Library

Why California Fastener

Why California Fastener for power transmission.

Utility work is a paperwork business as much as a hardware business. We stock to the major utility MALs, test-document every HDG lot, and know the difference between a Type 1 and Type 3 A394 bolt without having to look it up. Transmission and distribution crews have been calling us for obsolete cross-arm hardware for decades — and we still find it.

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Let’s build it together.

Line rebuild, substation expansion, or just a cross-arm hardware replenishment? Send the BOM and the utility spec. We’ll match the MAL, stage to your yards, and ship with the test docs your compliance team needs.

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