CRKT D4040 Knife Sheath
- Knife Sheath
- Plastic
- 1.1 ounces
- 4.1 inches
A lightweight plastic sheath sized for a small fixed blade, worth checking against your specific CRKT knife model before ordering since compatibility is not stated.
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How it ranks among the 27 knife sheaths we track
4.3★ across 181 Amazon ratings, Bayesian-smoothed toward the category average.
181 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 27 knife sheaths we track - how the scorecard works · full knife sheaths 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 CRKT D4040 is a plastic knife sheath, not a knife itself, sized for a blade around 4 inches long. At 1.1 ounces it is built to be carried on a belt rather than used as a standalone tool.
Unlike some sheath listings that turn out to be mislabeled knives, this one lines up: the title says sheath, the material is plastic throughout, and the 4.14 inch length and 1.1 ounce weight both sit in the range typical of a small fixed-blade sheath rather than a knife. CRKT sells sheaths both bundled with knives and separately as replacement parts, and this listing does not confirm which knife it is meant to pair with.
- Brand: CRKT
- Model: D4040
- Category: Knife sheaths
- Length: 4.14 inches
Who it's for
Useful for a CRKT knife owner who needs a replacement or spare sheath sized for a roughly 4 inch blade. Not the listing to buy if you are shopping for the knife itself.
Strengths and trade-offs
Drawn from this product's published specifications.
- Light at 1.1 ounces for belt carry
- Sized for a compact roughly 4 inch blade
- Does not include a knife
- Specific knife model compatibility not confirmed
Performance notes
A one size plastic sheath at this weight is designed purely to protect the blade edge and allow belt carry, with no locking or retention specs given here to describe how securely it holds the knife in place.
Specifications
| Brand | CRKT |
|---|---|
| Model | D4040 |
| Material | Plastic |
| Item Weight | 1.1 ounces |
| Length | 4.1 inches |
| Size | One Size |
| Handle | Plastic |
How it compares
This product against the closest alternatives we track in knife sheaths.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| CRKT D4040 Knife SheathThis product | 4.3 / 5 | 181 | 3.6 / 5 |
| Case 00980 Knife SheathCase | 4.6 / 5 | 3,248 | 4.3 / 5 |
| Dexter-Russell WS-1 Knife SheathDexter-Russell | 4.6 / 5 | 941 | 4.2 / 5 |
| Sheath CO-SHEATH-BK Knife SheathSheath | 4.5 / 5 | 599 | 4.1 / 5 |
| Leather LP00299 Knife SheathLeather | 4.6 / 5 | 483 | 4.1 / 5 |
Similar knife sheaths from other brands
Questions about the CRKT D4040
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the CRKT D4040 include a knife?
No, based on the title and specs this listing is for the sheath alone.
What size blade does the D4040 sheath fit?
It is sized at 4.14 inches, suited to a small fixed blade, though exact model compatibility is not confirmed in this listing.
What is the D4040 sheath made of?
Plastic, including the handle-side material.