Fillet Knife Private Label Specification for Importers and Brands

What buyers must specify first

A fillet knife private label spec should start with use case, not decoration. A 6-inch freshwater fish knife, a 7-inch salmon knife, and a 9-inch saltwater boning-style fillet knife do different jobs on the grinding line. If you want a fillet knife factory in China to quote cleanly, tell us the target fish size, the flex you want, and where the knife sits in your price band. That drives steel grade, blade taper, and handle geometry.

Use a simple spec sheet with these items: blade length in mm, blade thickness at the spine, steel grade, hardness range, finish, handle material, tang style, packaging type, and logo method. We usually see importers start with 150 mm or 180 mm blades, 1.8 mm spine thickness, full tang or molded hidden tang, and a non-slip handle. For private label work, ±0.5 mm on blade length and ±0.2 mm on thickness is a practical target if you want stable output. QC pulled the sample yesterday and the caliper matched that window.

Do not let the sample become the spec. If the sample looks good but the drawing is loose, the second lot drifts. Put the approved sample number, photo, and revision date into the PO. We’ve seen one missing digit on a PO turn into a 3,000-piece headache, and that is the wrong question to ask after production starts.

• Blade length: 150 mm, 165 mm, 180 mm, or 200 mm
• Blade thickness: 1.6-2.0 mm for flexible models
• Hardness: 54-56 HRC for stainless fillet knives
• Target use: freshwater, saltwater, left-hand, or right-hand
• Packaging: hang card, blade guard, gift box, or display tray

If you sell into Europe or North America, ask early whether you need REACH, LFGB, or FDA-related material declarations for handle and coating components. A proper spec saves time because your QC team in Yangjiang or Zhejiang can test against one written target instead of debating what “flexible” means. We ship faster when the paper is tight.

Steel, hardness, and flex

For fillet knives, steel choice is a trade-off between corrosion resistance, edge stability, and flex. Most private label buyers still pick stainless steels because the end user wants low upkeep. On our line, 5Cr15MoV, 3Cr13, 7Cr17MoV, and similar Chinese stainless grades show up again and again because they are stable, easy to source, and run well at scale. If you want a premium story, you can move to a finer stainless grade, but the price jump is not small.

Do not chase high hardness without checking the blade geometry. A fillet knife at 58-60 HRC looks good on a spec sheet, but if the blade is too thick or the temper is off, it feels stiff and snaps out of the cut instead of working with the fish. For most private label SKUs, 54-56 HRC is the safe band. That gives usable edge holding and keeps flex in the blade. We run the taper by gauge: the tip needs to stay thin for clean slicing, while the heel has to take repeated bone contact without chipping.

Saltwater changes the spec fast. If your market includes coastal anglers, corrosion resistance matters more than a small gain in edge retention. Ask for passivation or anti-rust oiling, and make the packaging dry enough that it does not trap moisture. We had one buyer flag a black-coated fillet knife because the first carton sample showed scuffing at the blade spine, so coating adhesion became a QC gate, not a style choice. That is the wrong place to save money.

At TANGFORGE in Yangjiang, we see better results when the steel matches the channel. A retail box set for North America can carry a little more unit cost; a private label promo SKU in Zhejiang export programs usually needs a simpler steel and a clean QC record. QC pulled the sample on one run because the blade hardness drifted 2 HRC across the batch, and that kind of spread burns time. The math does not work if the claims are good but the margin disappears.

Handle, sheath, and branding

Handle design is where a lot of fillet knife OEM jobs go wrong after sampling. We’ve seen it on the grinding line: the blade passes, then the grip comes back slick, too thick, or loose at the blade-to-handle joint. For a working fillet knife, the handle has to stay planted when wet. Rubberized TPR, PP with overmold, pakkawood, and textured ABS are the usual picks. Wood looks good on a sales sheet, but for outdoor buyers we ship more molded synthetic handles because they hold up better in wet hands.

Set the branding plan before you lock the handle mold. If the logo panel is only 18 mm long, laser engraving usually reads cleaner than deep stamping. If you want a cleaner private label look, ask for pad print plus laser on the blade, or a small metal badge in the handle. A sheath or blade guard matters too, because a bent edge in transit turns into a return fast. One buyer once flagged 6% carton damage at inbound, and the fix was a rigid guard with barcode labeling, not a nicer box.

A usable private label spec needs handle length, thickness, color code, and slip resistance callouts. A 120-130 mm handle on a 180 mm blade is common; go shorter and the knife feels unstable on long cuts. We also check resin consistency lot by lot, because color drift shows up fast when MOQ is low. QC pulled the sample twice last month for a PO that had the handle color written as “dark gray” instead of a Pantone code.

• Logo methods: laser, silk print, die-stamped blade mark, handle badge
• Packaging choices: hang card, color box, PVC box, EVA tray
• Accessories: blade guard, sheath, care leaflet, barcode sticker

For importers who want brand presence without pushing unit cost up, the math is simple: clean blade logo, one-color box, molded guard. That ships better than trying to force heavy decoration onto a knife that spends most of its life in a wet sink or a bait cooler.

MOQ and price bands

Fillet knife MOQ usually sits lower than forged kitchen knives, but variant count still drives the number. One blade length, one handle color, one package: plenty of Yangjiang factories can start at 1,000 pcs. Add two colors, left- and right-hand versions, or a custom sheath, and the MOQ often shifts to 2,000-3,000 pcs per SKU. We see buyers argue this point every week, and the math does not change. A proper fillet knife private label specification should say whether MOQ is per size, per color, or per total order. QC pulled a sample here with a split handle batch once because the PO only said “mixed colors.”

FOB pricing sits in a wide band because steel, handle tooling, and packing all move the number. For a basic stainless custom fillet knife, USD 1.80-2.60 FOB is normal. For a cleaner model with better handle texture, sheath, and printed box, USD 2.70-4.80 is the range we ship in. If a quote comes in far below that, check steel grade, heat treatment, finish, and whether packaging inserts are included. A buyer once flagged a low quote that looked good on paper, then found the carton spec was missing and the edge grind was only half done on the grinding line.

Lead time needs to be written in plain numbers. Sample cycle: 12-18 days. Bulk production: 35-50 days after sample approval and deposit. Custom packaging adds 7-10 days for box production. We run orders to those windows only when the PO is clean; one typo on a carton mark can push the schedule by 3 days. For seasonal buyers, that matters more than a 5-cent print upgrade or a plain box.

If you buy from a fillet knife factory China on DDP terms, make sure the supplier splits product cost from freight and duty assumptions. DDP can work for the first shipment, but for repeat buying, FOB is cleaner when you want to compare real factory value. We’ve seen this go sideways when a buyer compared two offers with different duty estimates and thought the cheaper one was a win.

QC risks that hurt margins

The biggest QC risk in fillet knives is not a dramatic breakage. It is drift. One lot flexes the way the buyer wants, the next lot feels stiff on the bench. One carton carries a sharp logo, another shows a smeared pad print. That is how chargebacks and 2-star reviews start.

We normally check fillet knives against blade grind symmetry, hardness range, edge condition, handle fit, and carton count accuracy. On the grinding line, we set the acceptance target with AQL 2.5 for major defects and AQL 4.0 for minor defects. Major defects cover cracked handles, loose blades, wrong length, rust spots, and unsafe edge geometry. Minor defects cover light print shift, slight color variation, and finish marks that do not change use.

The process risks are easy to spot if you know where to look. Heat-treatment drift can move hardness by 2 HRC, and that is enough to change flex. A wheel on the grinder leaves an off-center tip or uneven belly. Weak handle bonding shows up after a few wash cycles. Packaging can blow up the order too: wrong barcode, missing insert, mixed left-hand/right-hand units. If the buyer is sending to Amazon or a distributor warehouse, this is the wrong question to ask: “Does the knife cut?” Count accuracy and carton labels decide the claim rate.

• Critical checks: blade length, hardness, edge safety, rust, handle lock
• Packaging checks: barcode, quantity, inner box fit, carton drop resistance
• Documentation: approved sample, QC report, photo record, lot traceability

At TANGFORGE in Yangjiang, we run first-article approval before mass run, then in-line checks every 2 hours with a hardness tester, and final inspection before packing. Last month QC pulled the sample on a private label order because the carton count was off by 2 pieces in a 100-box run. That is the only practical way to protect margin when the line is switching between 6-inch and 7-inch fillet knives.

What to put in the PO

Your purchase order is the control document. If the PO is thin, the factory will read it loosely, and repeat orders go sideways fast. For a private label fillet knife, put the blade drawing, approved sample code, steel grade, hardness band, handle material, logo file, packaging artwork, and target AQL in the PO. Add the agreed Incoterm—FOB China, CIF, or DDP—plus the delivery address and any pallet spec. We have seen buyers miss a 0.3 mm blade thickness note and then argue at shipment; the math does not work.

Spell out what happens if the order is split across two production lots. If you order 3,000 pcs and we ship 1,500 pcs + 1,500 pcs, ask for the same steel batch or the same heat-treatment target, not a loose “same quality” note. If the first lot uses sample-approved packaging and the second lot gets a substitute carton, your brand takes the hit. QC pulled the sample on one run because the carton print shifted 2 mm, and the buyer flagged it only after the first pallet landed in Rotterdam.

Useful PO details include:

• Blade length tolerance and thickness tolerance
• HRC band and steel standard
• Handle color Pantone or RAL reference
• Logo placement and artwork file version
• Carton count, master carton size, and gross weight
• Inspection standard: AQL 2.5 major, 4.0 minor

One more point: if you want laser engraving, state the depth or visual standard, not just the words. On the grinding line, “laser logo” can mean a light mark or a deep burn depending on speed, heat, and the handle finish. The PO should kill that ambiguity. We ship better when the note says 0.15 mm visual depth or a signed sample match, because “looks fine” is not a production spec.

How to compare factory quotes

When you compare fillet knife OEM quotes, do not stop at unit price. Put the full spec sheet on the table. We have seen a 5-cent handle saving get wiped out by extra carton inserts, higher scrap on the grinding line, and a wave of returns. Ask every supplier to quote the same blade size, same HRC, same handle type, same guard, same box, and same inspection standard. If one quote uses 50 mm and another uses 120 mm, the math does not work.

Use a side-by-side matrix. Simple works.

Good factories say what is included and what is extra. We run into buyers who chase the lowest number, then come back when the PO has the wrong box style or the handle color is missing from the quote. That is the wrong question to ask. A factory that gives you a clean spec, a realistic MOQ, and a lead time it can actually hit is safer than a cheap offer with no production detail. QC pulled the sample on one 2,000-piece order and found a 1.2 mm tip deviation, and that kind of miss tells you more than a glossy price sheet. If your sourcing team wants a stable supply base, ask for factory capacity too. A plant with 240 employees and steady monthly output will handle repeat orders better than a trading-style quote with no shop-floor depth, especially for Europe or North America replenishment.

Frequently asked questions