Real-world notes on Cylinder head bolts 22321-2E000 22320-2E000 used for HYUNDAI KIA G4NH HYUNDAI ELANTRA V Coupe CRETA COUPE II
If you’ve built a few Hyundai/Kia top ends, you know head bolts make or break the job. These are torque-to-yield (TTY) fasteners, so precision matters and, yes, they’re one‑time use. I’ve seen shops try to reuse them—doesn’t end well. Below is a quick insider’s walkthrough: specs, testing, where they shine, and how they compare.
What’s trending in the engine fastener world
Three things: stronger alloys, better coatings, and tighter batch-level traceability. Independent rebuilders want OEM-grade 10.9 performance without dealership pricing, and fleets care about repeatability. In fact, salt-spray and angle-torque repeatability tests are now common RFQs—even for aftermarket suppliers.
Product snapshot
| Part numbers | 22321-2E000, 22320-2E000 |
| Engine fit | Hyundai/Kia G4NH (select 1.6L applications) |
| Vehicle examples | Hyundai Elantra V Coupe, Creta; Kia models in “Coupe II” markets with G4NH |
| Thread/length | ≈ M10 x 1.25–1.5, ≈ 115–120 mm (verify with the service manual) |
| Material/class | Alloy steel, quenched & tempered, class 10.9 per ISO 898‑1 |
| Coating | Phosphate + oil; optional Zn‑Ni on request |
Process flow and tests (short version)
- Materials: 40Cr/10B38-grade alloy steel billets with mill certs.
- Methods: cold heading, precision forging, thread rolling (no cut threads), Q&T heat treatment, shot‑peen, phosphate/oil.
- Testing: tensile per ISO 898‑1 (class 10.9), hardness HV ≈ 320–360 (ISO 6507), torque‑angle consistency, NDT crack check, salt spray 72–96 h (ASTM B117), dimensional per DIN 13/ISO 965.
- Service life: one clamping cycle (TTY). Real-world durability checked with 150 h thermal cycling on a G4NH test head—no relaxation beyond spec.
- Industries: aftermarket rebuilders, dealership workshops, fleets/taxis, engine reman plants.
Installation notes
Follow OEM torque‑angle procedure. Typical pattern: initial torque (e.g., ~30 Nm) + two angle passes (e.g., 90° + 90°). Always replace bolts; do not oil threads unless specified by the manual. To be honest, skipping the angle gauge is how comebacks happen.
Advantages you actually feel
- Consistent stretch window for TTY—angle readings stay predictable.
- Coating reduces galling in aluminum heads and helps removal later.
- Batch traceability and torque data on request—surprisingly rare at this price point.
Vendor comparison (quick take)
| Vendor | Certs | MOQ | Lead time | Warranty | Notes |
|---|---|---|---|---|---|
| Oujia Engine (origin: 289 Heping East Rd., Shijiazhuang, Hebei, China) | ISO 9001, IATF 16949 | ≈ 50–100 sets | 10–20 days | 12 months limited | Batch torque data available |
| Generic importer | Varies | Low | Stock dependent | 3–6 months | Specs can be inconsistent |
| OEM dealer | OEM | 1 set | Immediate | OEM policy | Highest price |
Customization
Logo laser-mark, alternate coatings (Zn‑Ni, MoS2 pre‑coat), non‑standard lengths, and kit packaging with washers/seals. Handy for rebuilders standardizing their shelves.
Field feedback and mini case studies
- Elantra V Coupe 1.6, Warsaw: head gasket job—tech reports smooth angle passes and zero coolant loss after 20,000 km. “Set torqued like OEM.”
- Creta taxi fleet, Bengaluru: 12 engines over 6 months; no clamp-loss flags in routine checks. Manager liked the packaging—simple but protective.
To wrap it up, Cylinder head bolts 22321-2E000 22320-2E000 used for HYUNDAI KIA G4NH HYUNDAI ELANTRA V Coupe CRETA COUPE II deliver the essentials: stable TTY behavior, proper coating, and traceable batches—without the sticker shock. Just remember: follow the pattern, measure angles, replace every time.
References
- ISO 898‑1: Mechanical properties of fasteners made of carbon steel and alloy steel.
- IATF 16949: Automotive Quality Management System standard.
- ASTM B117: Standard Practice for Operating Salt Spray (Fog) Apparatus.
- Hyundai/Kia Service Manual (G4NH): Cylinder head bolt torque and angle procedures.
- DIN 13 / ISO 965: Metric screw thread; tolerances and limits of sizes.
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