STANLEY STMT77798-23B 10mm VDE Insulated Socket in Lucknow

Fit and Safety Checks Before Ordering

10mm denotes the socket's working opening for a 10mm external hexagonal fastener, not a 10mm internal Allen recess. The 3/8-inch square drive (about 9.5mm) is the connection to a compatible hand ratchet or extension. Verify the screw or nut's actual wrenching size, the socket's available external clearance and the drive connection independently.
For electrical-maintenance work, select a complete, compatible system of suitably rated insulated manual tools and follow the workplace electrical-safety procedure. A listed 1000V insulation specification does not authorize work on energized equipment. Isolate, lock out where applicable, verify the absence of voltage, and follow the instructions of qualified personnel and the equipment manufacturer. Inspect each socket before use; damaged, contaminated or deteriorated insulation must not be treated as protective. If a project requires documented VDE or IEC 60900 compliance, obtain current exact-model conformity evidence and inspect physical markings before relying on the claim.
Review the current purchase price and destination options.

STANLEY STMT77798-23B Technical Specifications

Dimensional interpretation: The 45mm measurement is overall length, not a guaranteed socket insertion depth or working reach. The marked D1 19.5mm and D2 23mm are drawing dimensions, not alternative fastener sizes. Confirm the available space around the fastener, including the insulation and tool-body clearance. The source documents do not establish a universal permissible tightening torque, impact rating, independent certification number or warranty term for this exact offered unit.

When a 10mm Insulated Socket Is Appropriate

Where the actual fastener is a 10mm external hex, this socket may be selected as part of a properly specified insulated manual toolkit for panel assembly, electrical-equipment covers, mounting brackets or serviceable electrical cabinets. These are possible application contexts, not claims that every panel or terminal uses 10mm hardware or that energized operation is safe. Check the panel manufacturer's fastening and isolation instructions first.
A compatible 3/8-inch insulated hand ratchet or extension helps position and turn the socket in accessible areas. Use the equipment manufacturer's fastening torque, especially for terminal connections. A square-drive size does not determine the correct tightening torque, and an ordinary uninsulated adapter may undermine a required insulated-tool assembly.

VDE Insulated Socket vs Ordinary Chrome Socket

An ordinary chrome socket may engage a 10mm external hex, but it does not provide the listed insulation function of this product. Do not substitute a bare socket where the approved procedure requires verified insulated tooling. Conversely, an insulated socket alone does not make the entire ratchet, extension, worker or workplace electrically safe.

3/8-Inch Drive vs a 1/2-Inch VDE Socket

STMT77798-23B has a 3/8-inch square drive. STANLEY separately lists STMT77829-23B as a 10mm, 1/2-inch VDE socket. Both relate to 10mm external-hex fasteners, but the drive connections differ and the models are not interchangeable without reviewing an appropriately rated system. Select the correct drive to match your insulated manual tools, not on an assumed torque advantage.

External-Hex Socket vs an Internal-Hex Bit

The socket fits around an external 10mm hexagonal nut or bolt head. A recessed 10mm internal hex (Allen) screw requires an appropriately specified male hex bit, not this socket. Check the fastener profile before ordering to avoid choosing the wrong insulated accessory.

Manual Ratchet and Extension Selection

A 3/8-inch interface may mechanically engage a standard ratchet, but mechanical fit alone does not establish electrical suitability. Where the work procedure requires insulated tools, use compatible insulated hand-drive accessories and follow the manufacturer and site instructions. STANLEY's insulated-tool series includes a separate 3/8-inch VDE ratchet STMT77824-23B and 3/8-inch extension bars STMT77825-23B and STMT77826-23B; evaluate each item and its documentation independently.

Lucknow Orders, GST and Stock-Based Delivery

For a delivery address in Lucknow, use the exact STMT77798-23B National Product Page to see the current price including GST, its tax breakdown, displayed stock and delivery-pincode checker. Indus MegaMart's generated purchase invoices include the company's GST number. Check how many sockets the current selling unit contains before paying or preparing an institutional purchase order. A Lucknow destination does not imply a locally stocked Lucknow warehouse or guaranteed same-day dispatch.
Indus MegaMart accepts orders and payment even when stock is zero. Under its stated policy, orders with quantity within available stock have delivery within seven days. If ordered quantity exceeds available stock, including zero-stock orders, the stated window is 7–14 days. Review the live pincode and checkout information for the particular delivery destination and order size.
For other sizes and styles, browse Socket & Socket Sets, explore the STANLEY product range, or see broader Hand Tools. Compare exact model numbers, fastener openings, drive sizes, insulation documentation and selling units separately for each item.

Frequently Asked Questions

1. Is STMT77798-23B a 10mm socket or a 3/8-inch socket?

Both measurements describe different parts. The 10mm opening fits a matching external hexagonal fastener, while the 3/8-inch square drive connects to an appropriately matched manual ratchet or extension.

2. Does it fit a 10mm internal-hex Allen screw?

No. STMT77798-23B is an external-hex socket. An internal-hex recess requires a suitable male Allen/hex bit of the correct size and, where applicable, the correct insulation specification.

3. What does its listed 1000V insulation specification establish?

The model-specific seller-linked sheet lists 1000V insulation. It does not independently authenticate a certification record or make energized work safe. Always follow approved isolation, tool-inspection and site-safety procedures.

4. Is independent VDE or IEC 60900 certification verified for this exact model?

The product is marketed as a VDE insulated socket, but an independent exact-model certification record was not confirmed in this product information. Obtain current conformity documents and verify tool markings if this is mandatory for procurement or a regulated task.

5. What are the socket's listed dimensions?

The seller-linked technical sheet gives 45mm overall length, D1 19.5mm and D2 23mm. Those dimensions do not guarantee usable recess depth, and the socket must still fit the clearance around the actual fastener.

6. Can I use any ordinary 3/8-inch ratchet with this socket?

An ordinary ratchet may mechanically connect, but that does not make the assembly insulated. For a procedure requiring insulated tools, use the compatible rated insulated hand-drive system specified by your employer and the tool manufacturer.

7. Is the price for one socket or a multiple-piece pack?

Indus MegaMart's inspected product listing does not clearly label a pack count. Confirm the order unit and invoiced quantity on the exact listing or with the seller before comparing competitor prices or submitting a purchase order.

8. Can I order for Lucknow if stock shows zero?

Yes. Orders and payment are accepted at zero stock under Indus MegaMart's policy. When ordered quantity exceeds stock, including at zero stock, the stated delivery window is 7–14 days. Check the delivery pincode and final checkout conditions.

9. Is this socket a substitute for isolating electrical equipment?

No. Insulated tooling complements, but never replaces, qualified-personnel procedures, lockout and isolation, absence-of-voltage testing, appropriate PPE and the equipment manufacturer's instructions.

Order the Exact 10mm VDE Socket for Lucknow

Confirm STMT77798-23B, the 10mm external-hex opening, 3/8-inch manual-drive compatibility, the listed 1000V insulation specification, required certification documentation and the seller's current order quantity. Then check the live price, delivery pincode and purchase options for the STANLEY STMT77798-23B 10mm VDE socket.