square head bolt production and testing (2)

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Product details

3/8" Square Head Machine Bolt Hot Dip Galvanized IEEE C135.1 & CSA C83 Poleline Fastener

YOKELINK Square Head Machine Bolt is designed for pole line fastener applications in overhead transmission and distribution systems. Manufactured from hot roll carbon steel and finished with hot dip galvanizing per ASTM A153 Class C, this provides excellent corrosion resistance for long-term outdoor service in utility environments.

Yokelink Square machine bolts is produced in accordance with IEEE C135.1 / IEEE C135.80 and CSA C83 requirements and features rolled threads, ensuring superior fatigue resistance and consistent mechanical performance during installation and service life. The square head design allows secure tightening using standard lineman tools and prevents rotation when installed through crossarms, pole brackets, insulator hardware, and other pole line components.

Yokelink square machine bolts are widely used as direct equivalents to Hubbell Power Systems (Chance), MacLean Power Systems (MPS), and Allied Bolt products, making them ideal for OEM replacement, utility stock programs, and project-based procurement. Other lengths and 1 inch diameter machine bolts are available.

304 & 316 Stainless Steel Square machining bolts are available per the request...

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Square Head Bolt Key Features & Benefits:

Rolled Threads: Produced by thread rolling process to provide greater tensile strength and fatigue resistance compared to cut threads.
Chamfered Point: Features a chamfered or sheared end for easy starting of the nut, adhering to standard specifications for 3/8" diameter bolts.
Corrosion Resistance: Hot Dip Galvanized to ASTM A153 Class C, ensuring long-term protection in coastal and industrial environments.
Ready to Install: Supplied with a HDG overtap square nut assembled.

Engineered for Cold Climates (CSA C83 Compliant):

Winter Ready: Ideal for the Canadian market. Our steel formulation maintains integrity in low temperatures (-20°C).

Oversize Tapping: Nuts are tapped oversize to ensure they spin freely even when installing with gloved hands in freezing conditions.

Square-Head-Machine-Bolt-Hot-Dip-Galvanized CSA C83

Square Head Bolt Application in Utility Poleline Construction

Crossarm mounting and reinforcement
Insulator hardware and pin installation
Pole top brackets and line construction hardware
Secondary and service line assemblies
OEM pole line hardware manufacturing

Yokelink Quality Control and Testing Equipments

We don't just reference standards; we also verify them in practice: each batch of products undergoes destructive tensile testing in our internal laboratory to ensure load performance exceeds the minimum requirements of IEEE C135.1 / IEEE C138.80 or CSA specification; we use optical comparators to ensure the geometric accuracy of chamfered tips and rolled threads, enabling convenient on-site installation; at the same time, we conduct comprehensive testing on Rockwell hardness, coating thickness, and other parameters, and each shipment is accompanied by the original manufacturer's material specifications (MTRs) and quality inspection reports, with all data traceable back to the raw material furnace number.

Technical Specifications of Square Machine Bolt:

3/8 Inch Diameter Minmum Tensile Strength 4,240 LBS

Part No.	Size	Bolt Length	Thread Length	Weight
Part No.	Size	Inch (A)	Inch (B)	Kg / Pcs
A0138-02	3/8"X2"	2	1	0.050
A0138-03	3/8"X3"	3	1	0.060
A0138-04	3/8"X4"	4	3	0.068
A0138-05	3/8"X5"	5	3	0.083
A0138-06	3/8"X6"	6	3	0.095

3 8‘’-square-head-machine-bolt-specification

When you need Square Machine Bolts for pole line hardware, refer to above our catalog. We offer them in a full selection of sizes, provide the length, diameter or part number to get a quote on these bolts, leave your message, or send us an email.

You can also call us on WhatsAPP to get answers to your questions and place your order.

Cross Reference (Industry Equivalents):

Yokelink P/N	Size	Comparable to Hubbell/Chance	Comparable to MacLean (MPS)
A0138-02	3/8" x 2"	8202	J8202
A0138-04	3/8" x 4"	8204	J8204
A0138-06	3/8" x 6"	8206	J8206

(Note: Manufacturer part numbers are for reference only. Yokelink products are interchangeable based on IEEE standards.)

Square Head Machine Bolt Factory Production Process

At Yokelink, every machine bolt for poleline hardware begins with high-grade carbon steel, processed through our advanced hot forging lines. Our state-of-the-art facility controls every step of the production process—from raw material selection to final hot-dip galvanizing. This vertical integration allows us to guarantee consistent quality, competitive pricing, and on-time delivery for projects of any scale.

Quality assurance is built into this workflow, not added on. Our in-house laboratory rigorously tests every batch for tensile strength, thread fit, and HDG coating thickness to ensure strict compliance with IEEE C135.80 /CAS standards. Finally, we treat packaging as a critical manufacturing step: products are secured in heavy-duty, reinforced cartons and palletized with weather-proof wrapping. This ensures your hardware withstands the rigors of ocean freight and arrives at your warehouse rust-free, organized, and ready for the grid.

Frequently Asked Questions (FAQ)

1.Q: Do these square machine bolts meet IEEE and CSA specifications?

A: Yes. Yokelink 3/8" square head machine bolts are manufactured in strict accordance with IEEE Std C135.80 (formerly ANSI C135.1) for tensile strength and dimensions. They are also fully compliant with CSA C83 standards, making them suitable for the Canadian utility market.

2.Q:Can I use Yokelink poleline fasteners bolts to replace Hubbell or MacLean parts?

A: Yes. Our poleline hardware bolts are functionally equivalent and interchangeable with industry-standard part numbers such as the Hubbell 82xx series and MacLean J82xx series. They meet or exceed the same mechanical load ratings (Min. Tensile Strength: 4,250 lbs for 3/8" diameter).

3.Q: Do you provide Mill Test Reports (MTRs) ,Drawing, or Factory Inspection Reports?

A: Yes, transparency is our standard. Full Mill Test Reports, Galvanizing Certificates, and Factory Inspection Reports are available with every shipment upon request, traceable to the raw material heat number.

Value-Added Supply Chain Services

1. Blanket Order & Free Warehousing

Yokelink offers Blanket Order programs: Place an annual order to lock prices, we manufacture your total volume and hold stock in our facility free of charge. Split Shipments: Schedule partial shipments (e.g., monthly or quarterly) based on your project progress. You get the benefits of just-in-time delivery without the risk of shortages.

2. DDP Shipping (USA Duties Included)

Landed Cost Certainty: We handle the complex logistics. Our DDP (Delivered Duty Paid) service covers sea freight, US Customs clearance, and Section 301 tariffs. The price we quote is the final price delivered to your door / Warehouse.