DIN982 nylon insert lock nuts: what buyers are asking in 2025

If you’re sourcing fasteners for machinery, HVAC frames, or general metalwork, you’ve probably typed DIN982 Nylon insert lock nut carbon steel zinc plated into your RFQ template more times than you can count. I’ve visited factories in Yongnian (the fastener hub of China) and, to be honest, the difference between a good Nyloc and a mediocre one shows up in torque data and plating consistency—not the catalog photo.

What it is and where it’s made

DIN982 Nylon insert lock nut carbon steel zinc plated is the workhorse prevailing-torque hex nut with a non-metallic insert. This particular line is produced in Dongtantou North, Yongnian, Hebei, China—an area that, surprisingly to some buyers, supplies a large share of the world’s commodity and OEM fasteners.

Specs that matter (beyond the buzzwords)

Item	Details (≈ real-world)
Standard	DIN 982; testing per ISO 2320 prevailing torque
Size Range	M5–M56; Metric & Imperial (Inch) threads
Material	Carbon steel Q195, 1035, 1045, 10B21
Grade	4, 6, 8, 10, 12 (as required)
Heat Treatment	Tempering, quenching, spheroidizing/annealing (as spec’d)
Hardness	Mild carbon steel ≈ HRC 25–60 (HV 450–700) depending on grade
Finish	Zinc plated per ISO 4042, thickness ≈ 5–12 μm
Insert	Nylon (commonly PA6/PA66; confirm per spec)
Temperature window	-40°C to +100°C continuous; short peaks ≈ 120°C

Process flow and QC (the part auditors love)

• Materials: certified wire rod (Q195/1035/1045/10B21)
• Cold forming → tapping → heat treatment (if graded) → zinc plating (alkaline or acid) → nylon insert assembly
• Testing: ISO 2320 prevailing torque, dimensional checks per DIN; plating per ISO 4042; salt spray (neutral) 72–240 h depending on coating; RoHS/REACH screening
• Service life: typical torque retention after 5 on/off cycles per ISO 2320; field use varies with vibration and temperature
• Industries: automotive subassemblies, HVAC frames, racking, light machinery, construction hardware

Recent lab snapshots (M8, coarse): first-off breakaway torque ≈ 1.6–3.2 N·m; fifth cycle residual ≈ 1.0–2.4 N·m, within ISO 2320 bands for the grade. In fact, many customers say the consistency is what saves them line downtime.

Real-world applications

Use DIN982 Nylon insert lock nut carbon steel zinc plated anywhere you have moderate vibration and want reusability across a few maintenance cycles. Not for sustained high-heat zones (swap to all-metal locknuts above ≈120°C), but perfect for brackets, guards, cable trays, pumps, and packaging machines.

Quick case study

A mid-size HVAC OEM in Central Europe replaced mixed-batch imports with Yongnian-made DIN982 Nylon insert lock nut carbon steel zinc plated in M6/M8. Complaint rate on fastener loosening dropped by around 38% over two quarters, largely due to tighter prevailing torque spread and better zinc finish. Their words, not mine.

Vendor comparison (what buyers benchmark)

Vendor	Origin	Certs	Lead time	MOQ	M8 Price/1k (≈)	Torque test
Factory A (Yongnian)	Hebei, CN	ISO 9001; RoHS/REACH	10–25 days	20–50k pcs	US$18–27	ISO 2320 report per lot
Trading House B	Mixed (CN/IN)	On request	25–40 days	10–20k pcs	US$22–34	Supplier CoC only
EU Brand C	EU assembly	ISO 9001/14001	Stock or 2–3 weeks	1–5k pcs	US$32–55	Full traceability

Prices fluctuate with zinc, energy, and freight. Always request current torque data and plating thickness results.

Customization

Non-standard runs are common: special thread pitches, thicker zinc for coastal installs, nylon color coding, or higher-grade steel (8–12). OEM by drawing or samples is routine in Yongnian—just be clear on torque classes and temperature limits.

A note on compliance

Ask for ISO 4042 plating declaration, ISO 2320 torque reports, and RoHS/REACH statements. It seems basic, but those PDFs save headaches during audits.

Final takeaway

For cost-effective, dependable locking performance, a properly made DIN982 Nylon insert lock nut carbon steel zinc plated is still hard to beat. Check torque data, plating thickness, and—this is my bias—visit the plant if you can. The good ones welcome it.

Authoritative citations

1. ISO 2320: Prevailing torque type steel nuts — https://www.iso.org/standard/41705.html
2. ISO 4042: Fasteners — Electroplated coatings — https://www.iso.org/standard/70484.html
3. DIN 982: Hexagon nuts with non-metallic insert — https://www.beuth.de/en/standard/din-982/4301713
4. RoHS Directive (EU) — https://environment.ec.europa.eu/topics/waste-and-recycling/rohs-directive_en