CDI 401SM Micro Adjustable Torque Screwdriver
- Head Style: Hex
- Item Length: 8.5 inches
- Material Type: Metal
- Item Weight: 0.7 pounds
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact 8.5 inch torque wrench built for small fasteners in tight clearance work, not a substitute for a full size high torque wrench.
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ASIN: B001F7VJIOModel: 401SMCategory: Wrenches
Overview
The CDI 401SM is a torque wrench measuring 8.5 inches long and weighing 11.2 ounces, sold as a single piece. Its short length and light weight put it in the small fastener class, suited to precise low to mid torque work rather than large lug nuts or structural bolts.
CDI is a recognized torque wrench brand, and the compact 8.5 inch length here fits small clearance jobs where a full size wrench will not reach, such as motorcycle, bicycle or small engine fasteners. The listing does not state a torque range, so exact application limits are not confirmed.
- 8.5 inch overall length
- 11.2 ounce weight
- Sold as a single wrench
- CDI brand
Who it's for
Suits mechanics and DIYers working on smaller fasteners in tight spaces, where an 8.5 inch wrench can reach and a full size tool cannot. Not the right pick for high torque automotive lug nut work, which needs a longer wrench with a higher torque range.
Pros and cons
- Compact 8.5 inch length reaches tight clearance fasteners
- Light 11.2 ounce weight for extended use
- Recognized CDI torque wrench brand
- Short length limits maximum torque output
- No torque range listed to confirm application
Performance notes
The short 8.5 inch length trades leverage for reach, letting it access fasteners that a longer wrench cannot, at the cost of the higher torque range a longer handle would provide. At 11.2 ounces it is light enough for extended precision work without fatigue.
Specifications
| Brand | CDI |
|---|---|
| Model | 401SM |
| Dimensions & fit | |
| Item Length | 8.5 incheslower than 51% of 371 wrenches |
| Item Weight | 0.7 poundslower than 70% of 356 wrenches |
| Item Dimensions | 8.5 × 1.5 × 1.5 inches |
| Head Size | 1/4 inches |
| Construction & materials | |
| Material Type | Metal |
| Color | Blue |
| Included components | |
| Unit Count | 1 |
| Included Components | Certificate Of Calibration, Plastic Case |
| Warranty & support | |
| Manufacturer Warranty Description | Limited Warranty: Snap-on Industrial Brands warrants that CDI Torque products shall be free from defects in workmanship and materials for the usable life of the product. |
| Other details | |
| Head Style | Hex |
| Number Of Items | 1 |
| Item Type Name | Micro Adjustable Torque Screwdriver |
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Frequently asked questions
How long is the CDI 401SM torque wrench?
It measures 8.5 inches, a compact length built for tight clearance work.
Does it come as a set?
No, it is sold as a single wrench, one piece.