Fenix TK21R vs ThruNite BSS V6 size comparison
The ThruNite BSS V6 is 13.5 mm (0.53 in) shorter than the Fenix TK21R, and 11 mm narrower at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
The ThruNite BSS V6 is 13.5 mm (0.53 in) shorter than the Fenix TK21R, and 11 mm narrower at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
Dimensions
| Fenix TK21R Check price ↗ | ThruNite BSS V6 Check price ↗ | |
| Length | 159.5 mm (6.28 in) | 146 mm (5.75 in)−13.5 mm |
| Head / width | 36 mm (1.42 in) | 25 mm (0.98 in)−11 mm |
| Body | 25.4 mm (1.00 in) | 24 mm (0.94 in)−1.4 mm |
| Weight | 221.4 g with battery | 97 g listed |
| Battery | One included 6000mAh rechargeable li-ion | 18650 |
| Max output | 3,600 lm | 2,000 lm |
| Throw | 480 m | 259 m |
| Type | Tactical | Tactical |
| Price | $134.95 at fenixlighting.com, as of Nov 4, 2026 | $49.99 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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TK21R vs BSS V6: how they differ
Size and weight
The ThruNite BSS V6 is the shorter light: 146 mm (5.75 in) against 159.5 mm (6.28 in), a difference of 13.5 mm (8%). At its widest point the ThruNite BSS V6 is 11 mm slimmer (25 vs 36 mm). Weights are published on different bases (Fenix TK21R: 221.4 g with battery; ThruNite BSS V6: 97 g listed), so they are not directly comparable.
Brightness and throw
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 2,000 lm for the ThruNite BSS V6, 80% more. For beam distance the Fenix TK21R reaches further: 480 m vs 259 m rated throw (85% more).
Battery
The Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion); the ThruNite BSS V6 runs on a removable 18650 battery.
Price
When we checked on Nov 4, 2026, the Fenix TK21R was $134.95 at fenixlighting.com and the ThruNite BSS V6 $49.99 at batteryjunction.com, so the ThruNite BSS V6 cost $84.96 less. Prices change often, so check the current price before you buy.
Type
Both are tactical lights in our catalog with a tube body.
Which should you buy?
Choose the Fenix TK21R if you want more output (3,600 lm vs 2,000 lm) and longer throw (480 m vs 259 m). Choose the ThruNite BSS V6 if you want a shorter light (13.5 mm shorter) and a slimmer profile (11 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix TK21R Check price ↗ ThruNite BSS V6
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
TK21R vs BSS V6 FAQ
Which is smaller, the Fenix TK21R or the ThruNite BSS V6?
The ThruNite BSS V6 is the shorter light: 146 mm (5.75 in) against 159.5 mm (6.28 in), a difference of 13.5 mm (8%). At its widest point the ThruNite BSS V6 is 11 mm slimmer (25 vs 36 mm). Weights are published on different bases (Fenix TK21R: 221.4 g with battery; ThruNite BSS V6: 97 g listed), so they are not directly comparable.
Which is brighter, the Fenix TK21R or the ThruNite BSS V6?
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 2,000 lm for the ThruNite BSS V6, 80% more. For beam distance the Fenix TK21R reaches further: 480 m vs 259 m rated throw (85% more).
Which is cheaper, the Fenix TK21R or the ThruNite BSS V6?
When we checked on Nov 4, 2026, the Fenix TK21R was $134.95 at fenixlighting.com and the ThruNite BSS V6 $49.99 at batteryjunction.com, so the ThruNite BSS V6 cost $84.96 less. Prices change often, so check the current price before you buy.
Do the Fenix TK21R and ThruNite BSS V6 use the same battery?
The Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion); the ThruNite BSS V6 runs on a removable 18650 battery.
Compare Fenix TK21R with similar lights
Compare ThruNite BSS V6 with similar lights
More
Sources
- Fenix TK21R: specs from Fenix product page (manufacturer). Price $134.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- ThruNite BSS V6: specs from manufacturer published specs as listed by batteryjunction.com. Price $49.99 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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