China-domiciled nylon PA 6 rod supply on Okorder.com lists a 1,000 kg minimum order quantity, 180 t/yr per-supplier capability, and TT or LC payment terms as of 10 May 2026 [S1]. 14 China-registered manufacturers and trading companies hold 42 active nylon injection-moulded-parts SKUs on Made-in-China.com, ranked as Manufacturer/Factory and Trading Company business types [S2].
Alibaba's nylon supplier index in May 2026 resolves multiple verified suppliers, with main products spanning warp knitting, conventional knit trousers, and knitted jacquard — indicating a textile-grade concentration that differs from the engineering-plastics channel of Okorder and Made-in-China [S3]. The three channels split the market by application rather than competing head-on.
Channel split: cast rod, moulded parts, and textile yarn
Three B2B channels carry distinct nylon sub-markets. Okorder's PA 6 rod listing represents the cast and extruded stock-shapes channel with engineering-plastic grade names and bulk kilogram pricing [S1]. Made-in-China concentrates on injection-moulded parts with 42 active SKUs from 14 factories running plastic injection moulds and custom plastic services [S2]. Alibaba's index skews toward textile filament and fabric products (warp knitting, knit trousers, jacquard), which are outside the engineering-plastics spec envelope but useful as a demand-barometer for caprolactam and adipic acid feedstock [S3].
For engineering buyers, only the first two channels — cast rod and injection-moulded parts — map to industrial specs such as tensile strength, heat-deflection temperature, and moisture absorption; the textile channel is procurement-irrelevant for mechanical nylon.
MOQ, capacity and lead-time benchmarks
Okorder's PA 6 rod quote is anchored at 1,000 kg minimum, with 180 t/yr per-supplier capability — implying a theoretical 6.7× turnover of MOQ at full monthly output [S1]. Made-in-China's moulded-parts manufacturers do not list a uniform MOQ; individual supplier MOQs are negotiated per SKU because mould amortisation dominates order economics [S2].
Practical translation: cast rod buyers face a 1,000 kg entry barrier with single-supplier 15 t/month throughput, while moulded-parts buyers face mould-cost barriers (typically USD 2,000-15,000 amortised across the run) but no kilogram MOQ. Comparing the two on three criteria: order entry size (rod 1,000 kg vs moulded negotiable), capacity (rod 180 t/yr per supplier vs moulded not publicly listed), and payment (rod TT/LC [S1] vs moulded T/T typical).
Grades and spec levers buyers must pin down
Okorder's PA 6 rod listing is the engineering stock-shapes grade; equivalent industrial-grade values used in the channel include density ~1.13 g/cm³, melting point 215-220°C, tensile strength 70-80 MPa (dry), and continuous service temperature around 100-120°C. These are not stated on the listing itself and should be confirmed against the manufacturer's datasheet rather than read from the B2B quote page [S1].
For injection-moulded parts, the same PA 6 / PA 66 family applies; moisture absorption is the dominant downstream spec because PA 6 saturates near 9-10% by weight and PA 66 near 8-9%, both of which shift dimensions and mechanical properties after moulding [S2]. Buyers comparing grades for hardware applications should consult this Nylon (PA) grade selection logic for data-center hardware reference for moisture and creep trade-offs.
Standards and certification surface
No research excerpt lists a specific ASTM, ISO, or DIN citation tied to the named suppliers [S1][S2][S3]. Buyers should require the manufacturer's lot-certified test report covering tensile, elongation, and moisture-content properties, and verify UL94 flammability rating for any electrical-enclosure application. General engineering-plastics references include ISO 1043-1 (polymer marking), ASTM D638 (tensile), and ASTM D789 (density of polyamide); these are not stated by the listed suppliers and should be confirmed during RFQ.
For a pressure-transmitter housing or flow-meter body, PA 6 is not the default — the typical engineering default is PA 12 or PPA for hydrocarbon / moisture exposure — but cost-driven consumer-grade and light-industrial enclosures do use PA 6. An industrial-valve handle or hand-wheel is a more common PA 6 / PA 66 GF30 application where the 30% glass-fibre reinforcement lifts heat-deflection temperature toward 250°C.
Application split: which nylon is for whom
Okorder's cast-rod channel is FOR machine shops cutting bushings, gears, wear strips, and rollers where buyers accept the 1,000 kg MOQ in exchange for stable unit cost [S1]. It is NOT FOR low-volume prototyping under 100 kg — for that path, machined PA 6 / PA 66 sheet offcut is the workaround.
Made-in-China's moulded-parts channel is FOR OEM buyers running 5,000+ piece production runs of brackets, clips, housings, and fasteners, where mould-amortised unit cost beats machined stock [S2]. It is NOT FOR short-run custom geometry under ~1,000 pieces — for that path, 3D-printed SLS PA 12 or machined stock rod is the alternative. Alibaba's textile channel is FOR apparel buyers and is procurement-irrelevant for engineering components [S3].
Failure modes and downstream constraints
PA 6 and PA 66 are hygroscopic; conditioning at 50% RH drives PA 6 to ~3% moisture, PA 66 to ~2.5%, and saturated PA 6 can carry 9-10% water by weight, which depresses tensile strength and shifts dimensions. The two China channels [S1][S2] do not state moisture-content limits on their public listings, so buyers should specify dry-as-moulded (DAM) test values versus conditioned values when issuing the RFQ.
A second failure mode is creep: at 50°C continuous service under sustained load, PA 6 strain can double versus room-temperature short-term tensile data. A pressure-sensor diaphragm housing or PLC mounting bracket in a 40°C cabinet therefore needs a derated working-stress factor, not the room-temperature tensile number. UV ageing is the third — natural PA 6 is not UV-stable; black-pigmented or carbon-black-loaded grades are the field-tested fix.
Pricing reality and what the listing pages hide
Okorder's PA 6 rod page displays "Ref Price: Loading" — no USD/kg number is rendered publicly [S1]. This is standard for B2B channels where the listed price is a placeholder until RFQ and volume are submitted. Made-in-China's 14 moulded-parts suppliers [S2] likewise show "Price" only after login or RFQ.
Trackable signals for buyers: (a) supplier factory count in the Made-in-China index rose or held at 14 between November 2024 and May 2026, indicating stable rather than expanding capacity in the moulded-parts sub-channel [S2]; (b) Alibaba's textile index remained the dominant channel entry in May 2026 with main products spanning knit applications [S3]; (c) Okorder's PA 6 rod listing is dated 10 May 2026, giving a fresh RFQ anchor for cast-rod buyers [S1].