CDI 401SM Wrench
- Wrench
- 1
- 11.2 ounces
- 8.5 inches
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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How it ranks among the 561 wrenches we track
4.7★ across 200 Amazon ratings, Bayesian-smoothed toward the category average.
200 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 561 wrenches we track - how the scorecard works · full wrenches data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
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.
Strengths and trade-offs
Drawn from this product's published specifications.
- 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 |
| Pieces | 1 |
| Item Weight | 11.2 ounces |
| Length | 8.5 inches |
How it compares
This product against the closest alternatives we track in wrenches.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| CDI 401SM WrenchThis product | 4.7 / 5 | 200 | 3.8 / 5 |
| Amazon AMZ1715 WrenchAmazon | 4.7 / 5 | 14,700 | 4.6 / 5 |
| Wheeler 553556 WrenchWheeler | 4.8 / 5 | 17,300 | 4.6 / 5 |
| LEXIVON LX-145 WrenchLEXIVON | 4.8 / 5 | 14,700 | 4.6 / 5 |
| MALCO MSHMLC WrenchMalco | 4.8 / 5 | 14,300 | 4.6 / 5 |
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Questions about the CDI 401SM
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
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.