Williams 1503MFRMHW 1/2″ Drive Micrometer Adjustable Torque Wrench, Dual Scale (20-150 ft-lb)

Description

The Williams 1503MFRMHW is a 1/2″ drive micrometer-adjustable click torque wrench with a dual scale (English and metric), covering a 20-150 ft-lb (34-194 Nm) torque range. Turning the handle sets the target torque against a laser-marked scale, and a spring-loaded pull-down lock ring holds that setting until you release it, so it won’t drift in use the way an unmarked adjustable wrench can. Drive sizes 1/4″, 3/8″, and 1/2″ include a quick-release button for fast socket changes without pulling the wrench off the fastener.

It holds ±3% CW accuracy of indicated value from 20-100% of full scale, meets or exceeds ASME B107.300 and ISO 6789, and is individually serialized with its own NIST-traceable certificate of calibration — ready to drop into an audited or ISO-controlled process without a separate calibration step at receipt.

This capacity range fits assembly and maintenance work in the 20-150 ft-lb window — from small-fastener electronics and instrument work up through heavier structural and machinery bolting, depending on which size you select from the family.

**Frequently asked questions**

**How often does this need to be recalibrated?** Williams recommends annual recalibration for tools in regular use, or sooner if the tool is dropped, used outside its rated range, or run at high frequency in production. Keep the original NIST-traceable calibration certificate on file for your quality records.

**What standards does it meet?** Meets or exceeds ASME B107.300 (the current consolidated standard for hand torque tools, superseding the older B107.14) and ISO 6789. Each unit is individually serialized and ships with its own certificate of calibration.

**Can it be used in both directions?** Check the accuracy spec above — some models are calibrated clockwise (CW) only, others bidirectionally (CW/CCW). Using a CW-only tool for critical CCW work will not give a certified reading.