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QXO42A — 1-5/16" Square Drive Open End Head, X-Shank. Configure a compatible interchangeable-head torque wrench for the fastener and available access.
QXO42A — 1-5/16" Square Drive Open End Head, X-Shank. Configure a compatible interchangeable-head torque wrench for the fastener and available access.
Assembly teams, automotive service departments and industrial maintenance teams may use this type of head for controlled tightening.
These industry examples are selection guidance, not additional manufacturer approvals.
Head length and offset can affect torque setup. Follow the wrench maker’s correction method where required; do not assume heads are interchangeable.
The table compares official catalogue details. These are selection options, not confirmed replacements. Check the differences against the task and existing equipment.
| Compare | QXO42A | QXO40A View product | QXO44A View product |
|---|---|---|---|
| Official model description | QXO42A — 1-5/16" Square Drive Open End Head, X-Shank | QXO40A — 1-1/4" Square Drive Open End Head, X-Shank | QXO44A — 1-3/8" Square Drive Open End Head, X-Shank |
| O.D., inches | 2-21/32 | 2-9/16 | 2-13/16 |
| Size, inches | 1-5/16 | 1-1/4 | 1-3/8 |
| Head Depth, inches | 9/16 | 17/32 | 19/32 |
| Shank (dia.) | X (0.735") | X (0.735") | X (0.735") |
For QXO42A, verify the required task, working range, interface dimensions and package contents against the official catalogue details. This final check helps prevent ordering a visually similar model with a different fit or capability.
An interchangeable head is one part of a torque-wrench system. The head opening must fit the fastener, while the shank or connection must match the intended wrench. These are separate checks. Next, examine the space around the joint and the direction of approach. An open-end, box-end or ratchet head may suit a different access problem, even when the nominal fastener size is the same.
Head geometry can affect the complete torque arrangement. Therefore, consult the wrench maker’s instructions for any required setup or correction before use. This listing does not establish a universal correction factor or compatibility across all wrench families. For controlled assembly work, record the head model together with the wrench and the applicable procedure. If calibration or traceability is required, confirm the required scope and documentation before purchase. The presence of a head in a catalogue does not by itself define the accuracy of the assembled system.
Define the intended job in practical terms before comparing options. Record the equipment or component involved, the operation to perform and the access available around it. Include the current tool or accessory if this purchase replaces an existing item. That context helps distinguish a size change from a different product function. It also makes the application and industry examples above easier to assess against the actual work.
The official listing identifies this model as 1-5/16" Square Drive Open End Head, X-Shank. Its catalogue grouping is Interchangeable Head, Click-Type Torque Wrenches / Open End Heads, inches. Use that description to identify the product format, then read the individual specifications for the details that matter to the job. A category describes where the product sits in the range; it is not an additional compatibility approval.
For this record, the available specification labels include Shank (dia.); Center of Fastener to Retaining Pin; Maximum Recommended Working Torque, ft-lb. Read each value together with its label and unit. A drive size, external dimension and working range describe different things, even if their numbers look similar. If the job requires a value that is not listed, request that detail before ordering instead of estimating it from the photograph.
The catalogue country-of-origin field is USA. This field concerns the listed product origin; it does not identify local inventory, delivery time or the warranty terms of a Vietnam quotation. Confirm those commercial details separately.
The comparison above names QXO40A and QXO44A. Review the displayed differences against the requirement for this job. Begin with function and compatibility, then compare access, configuration and included components. If the names differ by size, drive, colour or kit format, identify which difference matters before making a choice. Similar models are not automatic replacements, and a larger or more expensive option is not necessarily the better match.
Ask for a line-item description of the supplied configuration. For a set or kit, confirm the contents; for a component, confirm the quantity and the matching parent model where relevant. If photographs show a larger assembly or several items, do not assume all of them form part of this SKU. Keep any essential accessories and documents explicit in the quotation so that receiving checks can follow the same requirements.
On receipt, compare the item and its packaging with the ordered model, quantity and configuration. Check the supplied components and any requested documentation. Keep the product identification visible in the workshop’s inventory record. If the delivered item differs from the confirmed order, resolve that difference before assigning it to the planned job. This is especially useful when a range contains visually similar sizes or accessories for different parent tools.
For continued use, follow the manufacturer’s instructions for inspection, cleaning, storage and maintenance. Do not assume that a cleaning chemical, lubricant or maintenance method used on another tool is suitable here. Keep damaged or uncertain equipment out of the planned task until its condition is assessed. Record any replacement parts by model so future orders use the confirmed reference rather than a visual guess.
Send Techmaster Vietnam the model number QXO42A and details of the task or existing equipment. Include any required sizes, connections and accessories.
Before ordering, confirm the quotation, lead time, package contents and applicable warranty terms. The official catalogue is the technical reference; it does not establish local stock or a Vietnam selling price.
For the source record, see the official Snap-on product listing. You can also browse the Vietnam product catalogue for related tools.
