Sürmene Knife

Sürmene Knife is a geographical indication product that reflects a traditional craft unique to the Sürmene district of Trabzon Province in the Black Sea region of Türkiye. These knives, typically around 20 cm in length, are produced in single-edged, grooved-blade, pointed-tip forms, either single, double, or triple-edged.

Historically, since the 19th century, the Sürmene knife has evolved beyond weapons such as daggers, thrusting knives, and swords to include kitchen and butcher knives. It is manufactured using both traditional and modern methods, with over 130 distinct models developed through variations in techniques and materials.

Sürmene Knife (Generated by Artificial Intelligence)

Distinguishing Technical Features

The primary distinguishing features of the Sürmene knife are sharpness and durability, achieved directly through the quenching process applied to the steel. In modern methods, steel is heated to up to 1050 °C using electric and nitrogen-assisted thermal treatment machines to achieve a hardness of 54–57 HRC. In the traditional method, the steel is heated to a cherry-red state and then vertically immersed in pure dolphin fish oil, rotated during cooling. This technique reduces brittleness and ensures long-term durability.

Handles are traditionally assembled with yellow brass rivets and ferrules. Wooden handles are fitted with ferrules 0.50–0.60 mm thick, polished using sandpaper and felt, and oiled with tik oil. Varnish is not used. Plastic handles are shaped using injection molding.

Production Tools

In traditional production, tools are handmade by master craftsmen. The main tools include:

• Furnace and bellows: Operated using charcoal derived from chestnut wood.
• Anvil, shears, vise, and whetstone are used.
• Various hammers, chisels, grooving tools, dalduz, ferrule and apple molds, engraving tools, files, and saws are employed.

Production Methods

Traditional Method

• The blade is shaped through forging, cold planing, filing, and quenching.
• Processes include mounting the handle, attaching the apple and ferrule, decoration, and polishing.
• The wooden scabbard is completed with sheath covering and leather embellishments.

Modern Method

• Steel blanks are pressed using cutting dies.
• Hardened blades are tempered at 220–250 °C.
• Plastic or wooden handles are mounted, and surfaces are finished with polishing and sanding.
• Final operations include buffing, numbering (using acid or laser), labeling, and packaging.

Sürmene Knife (Generated by Artificial Intelligence)

Structural Classification

Knives are classified according to handle and blade types:

Handle Types

• One-piece handle (monobloc)
• Two-piece riveted handle
• Hidden tang handle

Handle Materials

• Wood (rosewood, venge)
• Horn and bone (buffalo, ox, cow)
• Riveted plastic (e.g., moblen, original black, polypropylene)
• Metal

Blade Types

• Pointed tip: Used in kitchen and hunting knives.
• Clip point: Preferred in butcher knives and cleavers.
• Serrated: Found in bread and vegetable knives.
• Blunt nose: Used in rotary, cheese, and fruit knives.

Knife Types

Various types exist based on production method and intended use.

Traditional Production Types

• Single-pointed Knife: 10–25 cm in length, historically used as a weapon, with either pointed or knuckle-duster handles.
• Triple Knife: A double-bladed type with a fork placed inside its sheath.
• Dagger: 30 cm long, 5 cm wide, double-edged, grooved, and pointed.
• Saldırma: Over 35 cm long, with a slightly curved body and single edge.
• Karakulak (Dagger): Approximately 60 cm long, curved after the midpoint, with forked handle ends; named after these forked ends.

Traditional and Modern Production Types:

Butcher Knives

• Bone-scraping knives: 8–18 cm blade length, 3 mm thickness, 36 mm width; made from high-carbon chromium steel with 54–57 HRC hardness.
• Hide-skimming knives: Oval-tipped, 8–14 cm blade length, 3 mm thickness, 36 mm width.

Kitchen Knives

• 8–16 cm blade length, 1.5–2.5 mm thickness; narrow and flexible design.
• Fruit knives: 7.5–8 cm blade length, 1.8 mm thickness, 20 mm width.
• Vegetable knives: 9.5–10 cm blade length, 1.5–2.1 mm thickness.

Rotary Knives

• 30–65 cm blade length, 2 mm thickness, 40–45 mm width; made from 4116 and TM05 steels.

Cleavers

• 4–5 mm thickness, 8–14 cm width; produced in both rounding (round) and cutting (straight) types.

Pocket Knives

• 5–15 cm in length, 2–3 mm thickness; made from 4116 and 420 steels.

Control and Geographical Criteria

The Sürmene knife must be produced exclusively within the boundaries of the Sürmene district. Even hand tools used in traditional production must be locally handmade. The production process and product conformity are inspected at least once annually by a five-member oversight body established by the Sürmene Municipality. This body consists of representatives from the municipality, chamber of commerce, industry directorate, public education directorate, and a certified knife master.

• In traditional production, packaging must bear the inscription “Produced by Traditional Method”.
• In modern production, only the term “Sürmene Knife” may appear; any wording suggesting handcrafting must be avoided.

Inspection results are reported annually to the Turkish Patent and Trademark Office. When necessary, services may be procured from specialized public or private institutions.