Zero Tolerance 0400ST

The Zero Tolerance 0400ST is a premium folding knife designed by Ken Onion featuring a SpeedSafe assisted opening, S-30V steel blade with a modified Tanto grind, aluminum handle with Trac-Tec inserts, and a reversible pocket clip.

Last updated16 July 2026

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Weight147 g (5.19 oz)

PriceUnknown

Blade steelS-30V

Lock typeLiner Lock

Technical Specs

Specifications

CategoryFolding Knife

Blade length95 mm (3.74 in)

Overall length216 mm (8.50 in)

Closed length127 mm (5.00 in)

Blade thickness4 mm (0.16 in)

Handle material6061-T6 Aluminum with Trac-Tec inserts

FinishBlack DLC coating on blade

Opening methodSpeedSafe assisted opening with thumb stud or index finger protrusion

Clip typeReversible tip-up and tip-down pocket clip, ambidextrous

Carry Profile

Best for

▣Everyday Carry▣Tactical Use▣Work Tasks

Limitations

Not best for

!Heavy Bushcraft

Field Signals

Common praise

✓

Excellent build quality

✓

Reliable assisted opening mechanism

✓

Strong S-30V steel blade

✓

Comfortable grip due to Trac-Tec inserts

✓

Ambidextrous design with reversible pocket clip

Watchlist

Common complaints

⚠

Lacks a sheath

⚠

Handle may feel small for some users

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