STANLEY STMT77838-23B 21mm 1/2-Inch VDE Socket in Indore

Check the exact socket and purchase details

Model, drive and fastener size

• Brand/model: STANLEY STMT77838-23B.
• Socket opening: 21 mm for a matching metric hexagonal nut or bolt head.
• Square drive: 1/2 inch (12.7 mm), for a compatible 1/2-inch-drive insulated hand ratchet or another suitable insulated driver.
• Product class: VDE-insulated hand-tool socket.

The 21 mm figure identifies the size of the fastener the socket engages. The 1/2-inch figure identifies the square-drive connection at the other end. They are different measurements; check both against the existing tool and fastener.

Price, GST and order quantity

The current selling price, GST-inclusive total and orderable quantity are displayed on the exact Indus MegaMart product listing. Check whether the listed selling unit is a single socket or a multiple-piece pack before entering the quantity. For purchase documentation, Indus MegaMart's generated invoices include the company's GST number.

Ordering when available stock is limited

An order can still be placed and paid for when the displayed available stock is zero or insufficient for the chosen quantity. Under Indus MegaMart's ordering policy, delivery is within 7 days when the ordered quantity is covered by available stock, and within 7–14 days when the order exceeds available stock, including a zero-stock situation. Confirm destination serviceability for your Indore pincode during purchase.

Dimensions and technical selection

21 mm insulated socket specifications

For equipment with tight access around a nut or bolt, compare the listed 32 mm and 27 mm outside dimensions with the actual working clearance. If clearance is critical, confirm dimensions before purchase rather than relying on the nominal 21 mm head size alone.
What VDE insulation means for selection
A VDE-insulated socket is part of a specialised insulated hand-tool system. A retailer lists this model with a 1,000 V insulation designation. Electrical suitability must still be evaluated for the actual task, including the exact tool markings, current condition of the insulation and the procedures required at the worksite. Where formal procurement approval depends on an IEC/VDE certificate for this precise part number, obtain the current model-specific documentation before approval.

Where the STMT77838-23B fits

Electrical maintenance and equipment fastening
The 21 mm head size may be relevant for suitable hexagonal fasteners on industrial equipment, electrical enclosures, plant maintenance assemblies and service hardware. The tool is chosen by the fastener's measured across-flats size, the specified drive interface and the safety requirements of the work—not simply by the fact that the equipment is electrical.
Matching an insulated manual-drive setup
Use a properly matched 1/2-inch insulated ratchet and compatible insulated extensions when the work requires an insulated tool assembly. Mixing an insulated socket with an ordinary uninsulated driver should not be treated as providing equivalent electrical protection for the complete setup. Inspect all protective surfaces and follow the site's isolation and safety procedures.
When this is not the right socket
Do not select this 21 mm socket for a 19 mm, 22 mm or inch-series fastener, even when the nominal difference appears small. It is also not the same product as a 21 mm spark-plug socket, an Allen/hex bit socket, an external-Torx socket or an impact socket. An impact rating, torque limit or powered-tool approval has not been established for this exact part in the information provided here.

Selecting 21 mm versus neighbouring sizes

Avoid rounding up a fastener size
A 21 mm head is not interchangeable with the neighbouring 19 mm, 22 mm or 24 mm sizes. If a socket slips or will not sit fully on the head, stop and verify the fastener measurement. A snug, complete fit is especially important before applying turning force through an insulated assembly.
Standard socket versus VDE-insulated socket
A conventional 21 mm socket may be a reasonable option for ordinary non-electrical mechanical work when the job's risk assessment does not call for insulated tooling. The STMT77838-23B is selected when the required hand-tool system specifically calls for a VDE-insulated socket. The VDE designation does not remove the need to isolate equipment or establish safe working conditions.

Indore purchase and procurement guidance

Order for a specific maintenance requirement
Procurement teams in Indore can match the stock requisition to the exact STMT77838-23B identifier, confirm the 21 mm size and 1/2-inch drive, and review the product's current GST-inclusive selling terms before making payment. For repeat servicing, specify the number of actual sockets required, then verify the seller's order-unit and quantity increments.
Confirm your delivery pincode
Enter the intended Indore delivery pincode when purchasing. Delivery is handled through the applicable order and stock policy; a Indore product page does not imply a local Indus MegaMart warehouse or locally held inventory. Place the order through the exact product page rather than a generic socket-category page.
Related buying routes
If another model is needed, browse the STANLEY range or the wider sockets and socket sets collection. The broader hand tools category is useful for coordinating compatible hand tools; always return to the exact SKU before checking out.

Frequently asked questions

1. Is the STMT77838-23B a 21 mm or a 1/2-inch socket?

It is both, but the numbers describe different connections: 21 mm is the metric hex-fastener size, and 1/2 inch is the square drive for the ratchet or other compatible hand driver.

2. Can the STMT77838-23B be used with a 3/8-inch ratchet?

Not directly. This model has a 1/2-inch square drive. Use a correctly specified insulated 1/2-inch driving arrangement appropriate to the job rather than assuming an ordinary adapter retains equivalent insulation.

3. Is the 1,000 V designation the same as a certificate for this SKU?

No. The 1,000 V designation is listed by a specialist retailer for STMT77838-23B. For certificate-controlled purchasing, confirm current model-specific manufacturer documentation and the markings on the supplied tool.

4. What are its approximate physical dimensions?

An exact-model retailer lists 55 mm overall length, with outside dimensions D1 32 mm and D2 27 mm. Confirm these if the socket must pass through a confined opening.

5. Is it intended for impact-wrench use?

An impact-tool rating has not been established for this exact VDE socket. Do not assume powered impact compatibility from the 1/2-inch drive size or the chrome-vanadium material alone.

6. How many sockets will I receive?

Check the selling quantity stated on the Indus MegaMart product page when ordering. A competitor's one-piece offer or a catalogue's carton quantity does not establish Indus MegaMart's unit of sale.

7. Can I order if the site shows zero stock?

Yes. Indus MegaMart's ordering policy allows orders and payment even with zero available stock. Where the order quantity exceeds available stock, including zero stock, the policy provides 7–14 days for delivery, subject to your delivery location being serviceable.

8. Does the displayed product price include GST?

Review the current GST-inclusive total and tax presentation on the exact product listing before payment. Indus MegaMart's generated purchase invoices include its company GST number.

9. Can I buy this model for delivery in Indore?

You can use the national exact-product listing to check the destination pincode, price, quantity and purchasing options for your Indore address. The Indore targeting does not establish immediate delivery or a local stockholding point.

10. Is this interchangeable with a normal 21 mm spark-plug or hex-bit socket?

No. The STMT77838-23B is a 21 mm metric hex-fastener VDE socket. Spark-plug sockets, hex-bit sockets and other specialist profiles serve different applications and should not be substituted on appearance alone.

Order the exact STANLEY 21 mm VDE socket

Confirm STMT77838-23B, the required quantity and the current GST-inclusive selling terms, then check your Indore delivery pincode. View the price and buy STANLEY STMT77838-23B 21 mm VDE Socket.