Insulator Crossarm Pins

12 month ago

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Ningbo Yokelink Machinery Co.,Limited

 11 year year

Product details

Drop Forged Crossarm Pin | ANSI C135.17 Insulator Pin | Nylon Thread Insulator Stud

Engineered to Distribute Heavy Conductor Loads Safely.

The Yokelink Drop Forged Crossarm Pin is designed to mount vertically through wooden or steel utility crossarms, providing a rock-solid foundation for pin-type high-voltage insulators. Its specialized structural design isolates and manages the intense lateral and downward forces exerted by the conductor line.

One-Piece Forged Strength & Wide Base Design:

Unlike welded alternatives, Yokelink crossarm pins are integrally drop-forged from high-yield carbon steel. This ensures seamless grain alignment and zero structural weak points. Each pin features a broad, square, or round saddle base (bearing flange). This critical feature maximizes the contact area against the crossarm, distributing mechanical stress evenly to prevent wood crushing or steel deformation under peak tension.

ANSI Compliant Threads & Superior HDG Shield:

Equipped with premium factory-molded Alloy Lead Threads or high-strength Nylon Threads (available in standard 1" or 1-3/8" ANSI profiles) for a precision fit with porcelain or polymer insulators. Each assembly comes complete with a heavy-duty square washer, hex nut, and lock nut, fully Hot Dip Galvanized to ASTM A153 for unyielding, decades-long outdoor corrosion resistance.

crossarm insulator pin for poleline hardware

Key Technical Features of Crossarm Pin

Industry Standard: Fully manufactured and tested to meet ANSI/IEEE C135.17 specifications. Crossarm Pin drawing

Integrally Forged: One-piece drop-forged steel body delivers maximum shear and tensile strength.

Crossarm Protection: Wide bearing base prevents wood compression and moisture pocket formation.

Thread Selection: Offered with standard 1" or 1-3/8" ANSI lead or nylon insulator threads.

Heavy-Duty Hardware: Supplied with full HDG mounting hardware (Square Washer & Nuts).

Production Process of Crossarm Pin

High-strength carbon steel bars are cut into fixed blanks and hot forged to form integrated base, shoulder and shank. Flash trimming and deburring are carried out, followed by precision thread rolling for insulator fitting. Quenching and tempering boost tensile strength, then all pins are hot-dip galvanized per ASTM A153 against rust. Final dimensional, hardness and load inspections are completed before packaging.

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 C135.2 or CSA C83 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.

Yokelink Product Quality Inspection Report

We provide comprehensive inspection services for machine bolts, including SGS test bolts and formal Production Part Inspect Report (PPIR). The SGS tests verify the bolts’ compliance with international standards like ASTM A307 and IEEE C135.80, covering mechanical properties and corrosion resistance. The PPIR details all inspection items, ensuring each machine bolt meets dimensional, performance and quality requirements, providing reliable quality assurance for overhead line and industrial applications.

Technical Specifications of Crossarm Pin

LOW VOLTAGE FORGED INSULATOR PIN

Part No.	Head Material	A	B	C	D	Weight
Part No.	Head Material	Inch	Inch	Inch	Inch	Kg / Pcs
LONG SHANK TYPE FOR WOOD CROSSARMS
C030110	Nylon	5	5 3/4	5/8	1	0.630
C030120	Nylon	5	6 1/2	5/8	1	0.655
C030130	Nylon	6	5 3/4	5/8	1	0.668
C030140	Nylon	6	6 1/2	5/8	1	0.686
C030150	Nylon	6	6 1/2	3/4	1	1.055
SHORT SHANK TYPE FOR STEEL CROSSARMS					1
C030210	Nylon	5	1 1/2	5/8	1	0.573
C030220	Nylon	6	1 1/2	5/8	1	0.655
C030230	Nylon	6	1 3/4	3/4	1	0.730

HIGH VOLTAGE FORGED INSULATOR PIN

Part No.	Head Material	A	B	C	D	Weight
Part No.	Head Material	Inch	Inch	Inch	Inch	Kg / Pcs
LONG SHANK TYPE FOR WOOD CROSSARMS
C030310	Nylon	6	6 1/2	5/8	1	0.882
C030320	Nylon	5	6 1/2	3/4	1	1.118
C030330	Nylon	6	6 1/2	3/4	1	1.115
C030340	Nylon	7	7	5/8	1 3/8	1.740
C030350	Nylon	7	7	3/4	1 3/8	2.045
C030360	Nylon	8	7	3/4	1 3/8	2.090
SHORT SHANK TYPE FOR STEEL CROSSARMS
C030410	Lead	7	1 5/8	5/8	1	0.955
C030420	Lead	8	1 5/8	3/4	1 3/8	1.727

Cross Reference (Industry Equivalents):

Part No.	HUBBELL	MACLEAN
Part No.	HUBBELL	MACLEAN
C030110	881P	J203Z
C030120	881AP	J204Z
C030130	884P	J206Z
C030140	883P	J207Z
C030150	4706P	J211Z
C030210	886P	J221Z
C030220	883P
C030230	PS893P	J224Z

Part No.	HUBBELL	MACLEAN
Part No.	HUBBELL	MACLEAN
C030310		J626Z
C030320	4705P
C030330	4706P	J606Z
C030340	4717P
C030350	4326P
C030360	4328P
C030410		J629
C030420		J631

Frequently Asked Questions (FAQ)

Q1: What is the primary function of the wide base on a Crossarm Pin?

A: The wide base (bearing flange) is a critical engineering feature designed to protect the crossarm. When high-voltage conductors experience wind-slap or ice loading, they transfer heavy downward and lateral leverage to the pin. The broad base distributes this structural stress over a large surface area of the wood or steel crossarm, preventing the hardware cutting from into or crushing the crossarm material, which would lead to loose lines and moisture rot.

Q2: What is the mechanical advantage of a drop-forged crossarm pin over a cast or welded one?

A: Mechanical safety. Drop-forged crossarm pins are hammered from a single piece of solid steel, forcing the internal metal grain to flow perfectly along the contours of the pin and shank. This eliminates the hidden internal porosity common in castings and the heat-affected weak zones found in welded pins. Under intense seasonal line tension, a forged pin will slightly bend under extreme overload rather than suffering a sudden, catastrophic brittle snap.

Q3: How do I know whether to order a Long Shank or a Short Shank Crossarm Pin?

A: It strictly depends on your crossarm material. Long Shank pins (typically 5-1/2" to 6-1/2" long) are engineered to pass completely through thick, standard utility wooden crossarms, secured by a large square washer and nuts at the bottom. Short Shank pins (around 1-3/4" long) are designed for steel structural crossarms, where the metal profile is much thinner but requires tight, high-torque thread engagement.

Q4: Will a 1-3/8" ANSI Lead Thread pin fit a standard polymer pin insulator?

A: Yes. The 1" and 1-3/8" thread specifications are standardized ANSI profiles used throughout global electrical distribution lines. Whether you specify a traditional Alloy Lead Thread or a modern Nylon Thread, the pitch and taper are engineered to smoothly interface with both historical porcelain threads and modern composite/polymer pin-type insulators without binding.

Q5: What standard governs the galvanizing thickness of Yokelink crossarm pins?

A: All our forged steel crossarm pins, alongside their accompanying washers and hex nuts, are fully Hot Dip Galvanized in strict compliance with ASTM A153. This industrial standard guarantees a heavy, uniform zinc coating that chemically bonds with the steel, providing a life expectancy of 30 to 50 years against aggressive atmospheric corrosion, industrial smog, and coastal salt spray.

Value-Added Supply Chain Services

1. Blanket Order & Free Warehousing Yokelink VALUE ADDED SUPPLY CHAIN (3)

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.

3. Free Sample Program

We offer Free Samples to qualified commercial buyers for testing and approval.

4. Empowering Latin America's Utility Infrastructure

We have established a robust supply chain and a proven track record across Brazil, Mexico, El Salvador, Honduras, Nicaragua, Ecuador, Bolivia, Chile, Peru, Uruguay, Guatemala, Argentina, and the Dominican Republic. From standard distribution lines to complex 34.5 kV double-circuit transmission projects, leading utility contractors trust Yokelink for uncompromising quality and on-time delivery.

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Ningbo Yokelink Machinery Co.,Limited

 Audited supplier

11 year

Address: Ningbo, China

Main Product: Poleline Hardware, Insulator fitting, Thimble eye, Anchor rod, Sturctral Bolt , Fastener

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