STANLEY STMT89308-8B 3/4-Inch Drive Extension Bar 400mm - Vellore

Technical Specifications

Standards referenced in STANLEY catalogue material: ASME B107.10M, ISO 3316, DIN 3123 and ISO 1174-1. Confirm specific product documentation where certification is required for procurement.

What Does 3/4-Inch Drive and 400mm Mean?

The 3/4-inch measurement identifies the square-drive connection, not the size of the nut or bolt.
The extension is designed to connect compatible 3/4-inch square-drive manual tools and sockets. A different drive size requires a correctly rated adapter.
The 400 mm measurement is the nominal product designation. STANLEY's technical drawing gives 406 mm as the overall length of this model.
These are two different dimensional descriptions of the same product. Check the complete length when measuring available working clearance.
An extension bar transmits applied torque; it does not multiply the torque setting by itself.

Where Is a 400mm Extension Bar Useful?

The extension can be useful where the socket needs to reach a fastener positioned inside a machinery housing or behind an obstruction while the ratchet or torque-tool handle remains outside the restricted area.
Potential applications include industrial maintenance, mechanical equipment servicing, fabrication fixtures and compatible heavy-duty manual socket assemblies.
Tool selection must account for available working clearance, fastener position, socket compatibility and the approved operating procedure.
Important: This is a manual-use extension. Do not assume it is suitable for powered impact-wrench operation without model-specific impact approval.

Four Checks Before Ordering or Using

1. Match the drive size. Confirm that the manual hand tool and socket both have compatible 3/4-inch square-drive interfaces.
2. Check the required length. Compare the nominal 400 mm product designation and 406 mm catalogue overall length with the available access space.
3. Choose the correct tool class. For powered impact applications, select a specifically impact-rated extension rather than assuming this polished chrome-vanadium manual extension is suitable.
4. Inspect and operate safely. Check square-drive ends and retention before use. Avoid side loading, maintain secure socket engagement, and follow the torque-tool manufacturer's instructions.

400mm vs 200mm Extension vs Impact Extension

Choose the shortest compatible extension that provides sufficient reach and allows safe operation.

Buying and Delivery in Vellore

This address supports local procurement enquiries but does not establish immediate Vellore warehouse stock or a same-day collection facility.
The product page lists the STMT89308-8B extension bar as a pack of two pieces and provides an Add to Cart option and delivery-pincode checker.
Available stock was displayed as zero units. Under the merchant's stated ordering policy, customers can place orders and complete payment even when stock is zero. Quantities exceeding available inventory have a stated delivery window of 7–14 days.
Confirm the current checkout price, quantity and delivery eligibility for your Vellore pincode.
For project or bulk requirements, provide the exact part number, number of two-piece packs, delivery pincode, GST billing details and required delivery window.
Request an Industrial Quotation

Frequently Asked Questions

1. Is STMT89308-8B a 3/4-inch or 1/2-inch extension?

It is a 3/4-inch square-drive extension, equivalent to a nominal 19.05 mm square-drive connection.

2. Is the extension 400 mm or 406 mm long?

The product is marketed as a 400 mm extension. STANLEY's technical drawing specifies 406 mm overall length.

3. What material is used?

STANLEY technical information identifies chrome-vanadium steel with a fully polished finish.

4. Can the extension be used with an impact wrench?

The reviewed catalogue specifies manual use. Choose an appropriately impact-rated extension for powered impact applications unless the exact model has verified impact approval.

5. Does the extension increase torque?

No. The extension provides additional reach and transmits torque. It is not a torque multiplier.

6. Does the ₹3,089 price cover one extension bar?

No. Indus MegaMart lists ₹3,089 including GST for a pack of two pieces. The displayed ₹1,309 per-piece figure is before GST.

7. Can I order when available stock is zero?

Yes. Indus MegaMart's ordering policy allows order placement and payment when stock is zero, with a stated 7–14-day delivery window for quantities exceeding available stock. Confirm the live checkout and destination details.

8. Can I request a bulk quotation in Vellore?

Yes. Specify STMT89308-8B, the required number of two-piece packs, Vellore delivery pincode and GST billing requirements through the seller's enquiry form.

Buy STANLEY STMT89308-8B in Vellore

For compatible 3/4-inch manual socket assemblies, choose the STANLEY STMT89308-8B nominal 400 mm extension bar.
Confirm the two-piece pack quantity, latest GST-inclusive price, available stock and delivery eligibility before purchasing.
Buy STANLEY STMT89308-8B — Exact Indus MegaMart Product Page
For multiple packs or project procurement, request a quotation from Indus MegaMart.