USE, CARE AND WARRANTY
TECHNICAL SHEET

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Use, care and warranty

USE
PROFESSIONAL OPERATIONAL DEPLOYMENT

Extrema Ratio develops knives engineered for real-world applications, where control, precision, and reliability are essential requirements. Every model is designed to ensure stable ergonomics, proper balance, and consistent performance, even during prolonged use. Use the tool strictly according to its technical function, avoiding improper use or stress beyond its intended scope. Mindful use preserves safety, efficiency, and longevity, keeping structural and operational characteristics of the product intact.

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CARE
ESSENTIAL ROUTINE MAINTENANCE

Regular maintenance is fundamental to preserving the efficiency, reliability, and lifespan of your product. After each use – especially in the presence of salt water, humidity, mud, or grease residues – rinse with fresh water, dry thoroughly, and apply a suitable lubricant to metal parts and moving mechanisms. Periodically inspect the inside of the sheath, removing sand, dust, or abrasive particles that could damage the blade finish when sheathing or unsheathing.

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WARRANTY
OFFICIAL ASSISTANCE AND WARRANTY

Extrema Ratio knives are covered by a lifetime warranty against defects in workmanship, materials, or treatments that compromise their functionality. Sheaths are guaranteed for two years from the date of the first documented purchase. In the event of a recognized defect, the product will undergo a technical inspection and, where possible, be repaired. Should it prove non-restorable, the tool will be replaced with an identical, brand-new item. If the model is no longer available, it will be replaced with the most similar product in terms of features and value.

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Technical sheet

WEIGHT (G):

SATRE FX N690 BLACK: 99
SATRE FX N690 STONE WASHED: 99
SATRE FX S600 BLACK: 106
SATRE FX NITROGEN ORANGE: 97
SATRE FX NITROGEN YELLOW: 97

WEIGHT (oz):

SATRE FX N690 BLACK: 3,49
SATRE FX N690 STONE WASHED: 3,49
SATRE FX S600 BLACK: 3,73
SATRE FX NITROGEN ORANGE: 3,42
SATRE FX NITROGEN YELLOW:3,42

BLADE LENGTH (MM):

95

BLADE LENGTH (IN):

3,74

TOTAL LENGTH (MM):

190

TOTAL LENGTH (IN):

7,48

BLADE thickness (MM):

5

BLADE thickness (IN):

0,19

BLADE FINISHING:

SATRE FX N690 BLACK: MIL-C-13924 BURNISHING (58HRC)
SATRE FX N690 STONE WASHED: STONE WASHED
SATRE FX S600 BLACK: EXP DARK
SATRE FX NITROGEN ORANGE: ORANGE
SATRE FX NITROGEN YELLOW: YELLOW

BLADE MATERIAL:

SATRE FX N690 BLACK: BÖHLER N690 STEEL (58HRC)
SATRE FX N690 STONE WASHED: BÖHLER N690 STEEL (58HRC)
SATRE FX S600 BLACK: BÖHLER S600 STEEL (64HRC)
SATRE FX NITROGEN ORANGE: NITROGEN
SATRE FX NITROGEN YELLOW: NITROGEN

HANDLE MATERIAL:

SATRE FX N690 BLACK: BÖHLER N690 STEEL (58HRC)
SATRE FX N690 STONE WASHED: BÖHLER N690 STEEL (58HRC)
SATRE FX S600 BLACK: BÖHLER S600 STEEL (64HRC)
SATRE FX NITROGEN ORANGE: NITROGEN
SATRE FX NITROGEN YELLOW: NITROGEN

MAIN GRIND:

FLAT