Product Description
Our insulated extension bars are forged from premium Cr-V steel with precision heat treatment, delivering exceptional strength, high torque capacity and long-lasting durability. The fully insulated bars form a complete insulation protection chain when used with insulated ratchet wrenches and sockets, effectively preventing electric shock hazards. Available in 10mm (3/8″) and 12.5mm (1/2″) drive series with 125mm and 250mm working lengths, they extend your reach for deep-access tasks — essential insulated tool accessories for power maintenance, electrical installation and industrial repair applications.
Product Features
- Cr-V Steel Forging: Forged from high-quality chrome vanadium steel with through-hardening and tempering, offering superior strength, excellent toughness, strong impact resistance and much longer service life than ordinary carbon steel tools
- Full Insulation Protection: Special insulation treatment throughout the bar creates a complete insulating chain when paired with insulated ratchet wrenches and sockets, effectively preventing electric shock and ensuring operator safety
- Two Drive Series: Available in 10mm (3/8″) and 12.5mm (1/2″) drive sizes, compatible with different insulated ratchet wrenches and sockets
- Two Working Lengths: The 125mm short version handles standard extension needs with flexible operation; the 250mm long version provides extended reach for deep-access tasks, covering different application scenarios
- Precision Ball Lock: Built-in precision ball lock mechanism at the drive end securely holds sockets in place, preventing disengagement during work and improving operational safety
- Standard Drive Interface: Standard-sized drive tangs and square holes are compatible and interchangeable with mainstream brands of insulated ratchets, sockets and universal joints
- Anti-Corrosion Surface: Treated with anti-rust surface coating for excellent corrosion resistance, suitable for damp, dusty and other harsh working environments
- Ergonomic Design: Smooth, burr-free surface provides comfortable grip and smooth operation, reducing fatigue during extended use
Specifications
10mm Drive Insulated Extension Bars
Item No.
Length
Box Qty
Carton Qty
Unit Weight
Gross Weight
W71206
125mm
6pcs
48pcs
0.140kg
7.72kg
W71207
250mm
6pcs
48pcs
0.270kg
13.96kg
12.5mm Drive Insulated Extension Bars
Item No.
Length
Box Qty
Carton Qty
Unit Weight
Gross Weight
W71212
125mm
6pcs
48pcs
0.222kg
11.66kg
W71213
250mm
6pcs
48pcs
0.435kg
21.88kg
Key Features:
- Material: Cr-V Steel
- Drive Size: 10mm (3/8″) / 12.5mm (1/2″)
- Type: Insulated Extension Bar
- Lengths: 125mm / 250mm
- Locking Type: Ball lock mechanism
- Insulation: Full body insulation treatment
Application Scenarios
- Power Industry: Substation equipment maintenance, deep-access switchgear work, internal distribution panel disassembly — near-live tasks requiring extended reach
- Industrial Electrical: Factory motor repair, internal control panel work, deep bolt operations in production line equipment maintenance
- Construction Installation: Building electrical equipment installation and commissioning, internal distribution box wiring — scenarios requiring extended reach
- Automotive Repair: Deep engine bay repair, undercarriage electrical servicing — extended reach work in confined spaces
- Home Appliance Repair: Internal deep repair of household appliances requiring extended reach with insulation protection
- Telecom Maintenance: Telecom base station equipment servicing, internal installation and maintenance of signal tower equipment
- Rail Transit: Deep maintenance and inspection of subway and high-speed rail electrical equipment
- Machinery Manufacturing: Extended reach operations in precision machinery internal assembly and repair
Why Choose Us
- Professional Tool Manufacturer: With years of dedicated experience in hand tool R&D and manufacturing, we operate a comprehensive production system with rigorous quality control processes. Our products are exported to numerous countries and regions worldwide.
- Strict Quality Testing: Every insulated extension bar undergoes rigorous insulation performance testing and dimensional accuracy inspection to ensure stable and reliable product quality.
- Comprehensive Product Range: Our complete insulated tool lineup includes wrenches, pliers, screwdrivers, sockets, extension bars and more, offering customers one-stop procurement convenience.
- Premium Raw Materials: We use high-grade Cr-V steel and other top-quality raw materials to guarantee product quality from the source — delivering over 30% longer service life compared to standard tools.
- Customization Services: We offer OEM/ODM services tailored to customer needs, including custom brand logos, product specifications and packaging options.
- Fast Response Service: Our professional foreign trade team provides 24/7 rapid response, ensuring prompt answers to customer inquiries and efficient order processing.
- Reliable Supply Capacity: With a large production base and ample inventory, we guarantee on-time delivery even for bulk orders — keeping your sales cycle on track.
- Competitive Pricing: Factory-direct supply eliminates middlemen, offering customers more competitive prices and higher profit margins.
FAQ
Q1: What is an insulated extension bar used for? When do I need one?
A: Insulated extension bars are used to extend the reach of insulated ratchet wrenches. When you need to reach bolts, nuts or screws in deep or hard-to-access locations, the extension bar brings the socket to the target position for easier operation. They are commonly used for internal equipment repair, deep installation work and other scenarios where hands cannot reach directly.
Q2: What’s the difference between 125mm and 250mm lengths? How do I choose?
A: The 125mm extension bar is suitable for moderate depth extension tasks, offering flexible operation and direct torque transfer. The 250mm extension bar is designed for deeper work with greater reach. Choose based on the working depths you typically encounter — we recommend having both lengths on hand to cover different scenarios.
Q3: What’s the difference between 10mm and 12.5mm drive series?
A: The 10mm (3/8″) drive series is suitable for small to medium bolt sizes, with lighter weight and more flexible operation. The 12.5mm (1/2″) drive series handles greater torque and is suitable for larger bolt sizes. Choose based on your existing insulated ratchet wrench drive size and the bolt sizes you commonly work with.
Q4: Can insulated extension bars be used alone, or do they require other insulated tools?
A: Insulated extension bars must be used with insulated ratchet wrenches, insulated sockets and other insulated tools to form a complete insulation protection chain. Using the bar alone cannot provide adequate insulation protection. For best safety results, we recommend pairing them with our same-series insulated tools.
Q5: Is the ball lock mechanism durable? Does it break easily?
A: Our insulated extension bars feature precision ball lock mechanisms that have undergone rigorous lifecycle testing. They provide secure locking, smooth operation and exceptional durability, maintaining reliable performance after thousands of insertions and removals. Under normal use, they are not prone to damage.
Q6: Do you offer OEM branding? Are longer or shorter lengths available?
A: Yes, we offer OEM services with custom brand logos on products and packaging. We currently offer 125mm and 250mm as standard lengths. If you need other special lengths or custom specifications, please contact our foreign trade team — we can assess customization feasibility based on your required quantity.
