STANLEY STMT89307-8B 3/4" Extension 200mm - Pan India Supplier

It is used in heavy-duty automotive, construction, and industrial maintenance environments.

STANLEY STMT89307-8B Application Context & Use Cases

This extension bar is selected where direct socket access is restricted due to:

• Deep-set wheel hubs
• Heavy vehicle axle assemblies
• Structural steel bolting
• Earthmoving equipment maintenance
• Industrial plant flange connections

Typical operating environments:

• Commercial vehicle workshops
• Infrastructure contractors
• Equipment rental maintenance yards
• Industrial MRO departments

It is not a light-duty accessory. 3/4" drive systems are typically used where torque requirements exceed 400 Nm.

Selection Guidance – How to Choose Correctly
When selecting a 3/4" extension, confirm:

1. Drive size compatibility (3/4" system throughout)
2. Required extension length
3. Clearance depth
4. Torque class of application
5. Manual vs impact usage

The 200mm length is typically chosen when:

• Access depth is moderate
• Longer bars (300mm–400mm) may introduce flex
• Space constraints prevent direct tool positioning

Do not oversize extension length unnecessarily, as torque loss and deflection increase with length.

Capacity & Real-World Torque Logic
Understanding Torque Transmission
Extension bars do not increase torque capacity. They transmit applied torque from handle to socket.
Example Scenario
If a technician applies 600 Nm using a 3/4" breaker bar:

• The extension must withstand 600 Nm inline torque.
• If lateral load is introduced (angled pull), bending stress increases.
• Excessive length increases torsional flex.

In heavy vehicle wheel nut removal (typically 500–800 Nm):

• 200mm is commonly used when hub depth requires offset.
• 400mm may introduce torsional lag.

Correct length selection reduces energy loss and improves fastening accuracy.

Failure Conditions & Misuse Risks
Common causes of extension failure:

• Using chrome extension with impact wrench (without impact rating)
• Applying cheater pipes on extension instead of handle
• Lateral bending load due to misalignment
• Mismatched drive sizes
• Worn detent ball retention

Failure modes include:

• Torsional shear
• Drive end rounding
• Surface cracking
• Socket disengagement

Extensions are not torque multipliers. They are reach tools.

Who Should NOT Buy This
This model is not suitable for:

• 1/2" drive systems
• Light-duty DIY use
• Low torque household fastening
• Impact wrench use without confirmation of rating
• Applications requiring wobble or flexible joints

Incorrect drive size selection leads to tool mismatch and operational delay.

Material & Compatibility Table
Material Overview

Compatibility Matrix

Operational Handling & Installation Considerations

• Ensure detent ball locks securely into socket recess.
• Keep drive ends clean; debris causes misalignment.
• Avoid side-loading.
• Do not hammer extension.
• Store in dry environment to maintain surface integrity.
• Inspect for micro-cracks in high-cycle environments.

Before high-torque application:

• Confirm socket seating.
• Ensure full engagement depth.
• Align extension inline with fastener axis.

Commercial Clarity
Lead Time
Ready stock items are dispatched within 24–48 working hours, subject to order confirmation.
Dispatch Capability
Pan-India dispatch via surface or express logistics partners. Industrial packaging used to prevent transit damage.
MOQ
No mandatory MOQ for standard procurement. Bulk pricing available for workshop chains and distributors.
Customization
No dimensional customization available. Standard STANLEY configuration only.
Compliance
GST-compliant invoicing provided. Product supplied as genuine branded item.
Tender Compatibility
Can be supplied against institutional purchase orders subject to quantity confirmation and commercial terms.

 Procurement Process
To process efficiently, provide:

• Required quantity
• Delivery location (city & PIN code)
• GST details
• Required delivery timeline
• Whether part of bulk tool list

Process flow:

1. RFQ submission
2. Commercial quote issued
3. Order confirmation
4. Dispatch within committed timeline
5. Tracking shared post dispatch

Bulk procurement for workshops is supported.

Comparison Table – Common Alternatives

For straight-line high torque fastening, 200mm provides balance between reach and stability.

Selection Checklist
Before placing order, confirm:

• 3/4" drive system in use
• 200mm reach required
• Manual torque application
• No impact wrench unless verified
• GST billing required
• Delivery timeline confirmed

If all above conditions are satisfied, STMT89307-8B is technically suitable.

High-Intent FAQs
1. Is STMT89307-8B suitable for impact wrench use?
Standard chrome extensions are primarily for manual drive systems. Confirm impact rating before use with powered tools.
2. What torque range can this extension handle?
Torque capacity aligns with 3/4" manual drive system ranges. Actual tolerance depends on correct inline usage and no lateral loading.
3. Is 200mm length sufficient for heavy vehicle hubs?
Yes, for moderate depth hubs. For deeper recessed assemblies, longer variants may be required.
4. Do you maintain ready stock?
Stock status is confirmed at time of enquiry. Fast dispatch supported for confirmed orders.
5. Is GST invoice provided?
Yes. Supply is GST compliant.
6. Can bulk workshop orders be supported?
Yes. Quantity-based procurement for workshops and distributors is supported.
7. Is this a genuine branded product?
Supplied as genuine STANLEY branded product.