Quality

AQL Inspection for Socks: What Buyers Should Check

Published: 2026-06-18By ZheSock TeamReading time: 5 min

When you buy socks in bulk, one bad lot can trigger returns, credit notes, and rework at the warehouse. A sock AQL inspection gives buyers a shared way to judge lot quality, but only if the spec, defect list, and packing rules are written before production starts. The useful part is not the label. It is the exact sampling plan, the defect limits, and the checks on yarn, knitting, finishing, and carton count.

Table of Contents

1. What sock AQL inspection covers
2. Defects buyers should write down
3. How many pairs to sample
4. What to check in the factory
5. Color, size, and packing checks
6. What the PO and inspection sheet should say

What sock AQL inspection covers

Sock AQL inspection uses a lot sampling plan based on ISO 2859 logic. Inspectors take a sample from finished goods, then sort findings into critical, major, and minor defects. For socks, that means more than color and size. It includes holes, open toe seams, loose yarn ends, needle marks, wrong fiber content, pair mismatch, label errors, carton mix-ups, and packing damage.

Common buyer settings are critical at 0, major at 2.5, and minor at 4.0. That is a starting point. A 5,000 pair lot often falls into a sample size around 200 pairs at general inspection level II, but the exact count depends on lot size and code letter. Use the plan in the PO, not memory. If the buyer sells to retail, a single wrong size sticker can be a major defect. If the buyer sells a low-price promo sock, a small yarn tail may be minor.

Defects buyers should write down

Buyers need defect rules that the factory and inspector can read the same way. Vague words create disputes. Put size limits, shade limits, and stitch limits in the spec sheet.

Critical. Hole larger than 2 mm in the body, exposed sharp metal, strong chemical odor, wrong fiber claim, contamination that cannot be removed.
Major. Open toe seam, broken elastic cuff, heel misplacement over 5 mm, pair shade difference above Delta E 2.0 if you use lab data, size error beyond tolerance.
Minor. Loose yarn under 10 mm, light trim mark, small packing dent, crooked label within the accepted photo limit.

For a men's crew sock, a 3 mm hole in the toe area should usually fail. For a logo sock, a print shift of 4 mm may pass only if your written limit allows it. Put the rule in writing. Then inspect to that rule.

How many pairs to sample

Sample size comes from lot size and inspection level. Many buyers use general inspection level II for finished socks. A lot of 1,200 pairs may call for a sample around 80 pairs. A lot of 12,000 pairs may need more than 315 pairs. The point is simple. Bigger lots need a bigger sample.

For first orders, some buyers split the check into two parts. First, carton count and packing marks on all cartons. Second, random pair sampling from the packed lot. That catches short shipments, size mix-ups, and wrong barcode labels before dispatch. A small trial order also helps. Many importers start with 100 to 300 pairs per style, then raise volume after fit and wash results are confirmed. Lead time is often 25 to 45 days for repeat cotton sock styles, and 35 to 60 days for new yarn or jacquard programs.

What to check in the factory

Factory review and product inspection are not the same job. A factory review asks whether the plant can repeat the order. Product inspection checks the socks that were actually made. For socks, buyers should verify yarn lot records, knitting machine settings, needle condition, toe-closing method, linking quality, and final packing controls.

Ask for machine details. Common sock programs run on 84N, 96N, 120N, 144N, or 168N machines. Thicker sports socks often use 84N to 120N. Fine dress socks often use 144N to 168N. The yarn count matters too. A cotton crew sock may use 20s to 40s cotton yarn, while a tighter dress style may use finer yarn with higher gauge. If the supplier cannot tell you the needle count, gauge, or yarn count used for your style, that is a real warning sign.

Color, size, and packing checks

Many claim disputes start with small misses. A sock can pass a visual check and still miss the buyer's target if the black shade is off, the leg length is short by 1 cm, or the barcode on the bag is wrong. Color, size, and packing are commercial defects. Buyers should treat them that way.

Use a written size table with tolerance. Example. A men's crew sock that measures 25 cm heel to toe may allow plus or minus 0.5 cm after washing. For rib height, set a limit such as 18 cm plus or minus 0.7 cm. For color, approve a physical standard or lab dip before bulk runs. For packing, check pairing, header card text, polybag size, case pack, and carton mark. A 500-pair order can still fail if 20 pairs ship with the wrong size sticker or the wrong inner bag count.

What the PO and inspection sheet should say

The purchase order should remove guesswork. State the fiber blend, yarn count, gauge or needle count, sock length, size range, color code, packaging format, target AQL, and shipment terms. If the order is for 3-pair retail packs, say so. If it is for 10-pair bulk cartons, say that instead. If the buyer wants Amazon prep, school packs, or club packs, the carton and label rules should match the channel.

Inspection sheets should list defect photos, pass or fail limits, and test points for stretch recovery, wash shrinkage, seam strength, and label accuracy. Typical FOB prices move with yarn and packing. Basic cotton crew socks often land around USD 0.55 to 1.20 per pair. Higher-spec jacquard or dress socks often sit around USD 1.20 to 2.80 per pair. MOQ is often 500 to 1,000 pairs per style and color for private label runs, though smaller trial runs can be higher in unit cost. Keep the paperwork tight. That cuts down arguments later.

Frequently Asked Questions

What AQL level do most sock buyers use?

Many buyers start with critical at 0, major at 2.5, and minor at 4.0. That fits many retail and private label sock orders. Some buyers tighten major defects to 1.5 for premium programs or strict retail specs. The right setting depends on price, channel, and how visible the defect is to the end customer.

Should socks be checked before packing or after packing?

Both checks matter. Inspect the finished sock first, before the carton is closed, so you can catch knitting, seam, and shade problems. Then inspect packed cartons for count, labels, and shipping marks. If you only check loose socks, you can miss barcode errors, size mix-ups, and wrong inner pack counts.

Do wool socks and cotton socks need different inspection points?

Yes. Wool socks usually need more attention on shrinkage, pilling, and hand feel after wash testing. Cotton socks need closer checks on yarn evenness, toe closure, and color consistency. Compression socks need recovery and pressure checks that a basic fashion crew sock may not need. Match the defect list to the fiber and end use.

Can AQL inspection replace lab testing?

No. AQL inspection checks the actual lot for visible and measurable defects. Lab testing checks performance and compliance. Buyers still need wash shrinkage, color fastness, fiber content, and stretch recovery tests when the channel or market calls for them. AQL can catch a bad lot. It does not prove long-term wear performance.

How can a first-time buyer reduce risk with a sock supplier?

Start with a written spec, a sealed sample, and a small trial order. A 100 to 300 pair trial is useful for fit, color, and pack checks before a larger run. Ask for the lead time in days, the MOQ in pairs, and the machine gauge before payment. Review carton samples and label copies before bulk production starts.

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