Square Head Lag Screw - Gimlet & Fetter Drive | Hot Dip Galvanized
Yokelink Square / Hex Head Lag Screws are essential poleline fasteners designed to secure ground wires, guy hooks, and secondary clevises directly to wooden utility poles. Manufactured from high-quality carbon steel, these robust screws provide excellent holding power without the need to drill completely through the pole.
We offer both standard Gimlet Point threads for traditional wrench installation, and Fetter Drive threads. The fetter drive design features a sharp, specialized thread profile that allows the lineman to drive the screw deep into the wood with a hammer, and then securely seat it with a final turn of a wrench—saving critical installation time. All Yokelink lag screws are heavily Hot Dip Galvanized to ASTM A153 Class C to ensure decades of rust-free performance in harsh weather environments.
Key Features of Lag Screw
Head Style: Classic Square Head for easy grip with standard lineman wrenches.
Thread Styles: Available in Fetter Drive thread and Twist Drive thread.
Protection: Premium Hot Dip Galvanized for maximum corrosion resistance.
Application: Ideal for dead-ending, guying attachments, and grounding on wood poles.
Point Type: Pilot Point, Regular Point, Gimiet Point
Production Process of Lag Screw
Lag screws are manufactured from ASTM A307 carbon steel. After straightening and cutting, the material is formed by cold heading to create the hexagonal head. The shank is then processed by thread rolling to form sharp, durable lag threads for wood and heavy construction. Heat treatment ensures mechanical strength. All products are hot-dip galvanized per ASTM A153. Production and inspection comply with IEEE C135.1 and IEEE C135.80, suitable for heavy fastening applications.
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.
The Application of Lag Screw
Lag screws are heavy‑duty fasteners widely used in wooden structures, cross arms, pole fixtures, and outdoor construction. With sharp threads and strong holding power, they provide secure fastening in wood and solid materials. Made from ASTM A307 carbon steel and hot‑dip galvanized per ASTM A153, they offer excellent corrosion resistance. Compliant with IEEE C135.1 and IEEE C135.80, they ensure stable and reliable performance in overhead power lines and heavy‑duty outdoor applications.
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 Lag Screw
| Part No. |
Size |
Bolt Length |
Thread Length |
Weight |
| Inch(A) |
Inch(B) |
Kg / Pcs |
| A0712-03 |
1/2"X3" |
3 |
2 |
0.088 |
| A0712-04 |
1/2"X4" |
4 |
2-1/2 |
0.108 |
| A0712-05 |
1/2"X5" |
5 |
3 |
0.125 |
Fetter Drive Point
| Part No. |
Size |
Bolt Length |
Thread Length |
Weight |
| Inch(A) |
Inch(B) |
Kg / Pcs |
| A0712-03F |
1/2"X3" |
3 |
2 |
0.089 |
| A0712-04F |
1/2"X4" |
4 |
2-1/2 |
0.109 |
| A0712-05F |
1/2"X5" |
5 |
3 |
0.127 |
| A0758-05F |
5/8"X5" |
5 |
3 |
0.200 |
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.
3. Free Sample Program
We offer Free Samples to qualified commercial buyers for testing and approval.
Frequently Asked Questions (FAQ)
1.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 55xx series and MacLean J80xx series. They meet or exceed the same mechanical load ratings
2.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.
3.Q:Are your products suitable for harsh environments?
A:Yokelink machine bolts are specifically processed with Heavy-Duty Hot Dip Galvanizing (ASTM A153 Class C) to withstand the extreme heat, UV exposure, and high salinity conditions typical of the Middle East (KSA) region. Ideal for SEC (Saudi Electricity Company) distribution.
4.Q: What is the difference between a Fetter Drive and a Gimlet Point lag screw?
A: A standard Gimlet Point lag screw has a tapered, threaded point and must be twisted (screwed) into the wood for its entire length. A Fetter Drive lag screw has specially angled threads that allow a lineman to hammer the screw most of the way into the utility pole, and then use a wrench only for the final tightening. This significantly speeds up installation on the pole.
5.Q: Why do utility lag screws use a square head instead of a hex head?
A: Square heads provide a larger bearing surface for the wrench. When a lineman is working high up on a utility pole wearing heavy safety gloves, the classic four-sided square head is much easier to engage securely with a standard wrench without stripping or slipping compared to a hex head.
Reference Information:
For IEEE C135.1 technical details behind our specification, see Understanding IEEE C135.1 Standard
IEEE C135.1 Specification Download:
How to Choose the Right Machine Bolt Under IEEE C135.1
