--- title: "Auto Engine Fastener Cylinder Head Bolt Kits" description: "Auto Engine Fastener Cylinder Head Bolt Kits — Assortment Kits & Mixed Fastener Sets. Material: Iron. MOQ 1,000 pieces, US$1.20." url: https://engineeringhardware.com/product/auto-engine-fastener-cylinder-head-bolt-kits/ source: Engineering Hardware & Fasteners --- # Auto Engine Fastener Cylinder Head Bolt Kits [![Auto Engine Fastener Cylinder Head Bolt Kits](https://img.engineeringhardware.com/Auto-Engine-Fastener-Cylinder-Head-Bolt-Kits.webp)](https://img.engineeringhardware.com/Auto-Engine-Fastener-Cylinder-Head-Bolt-Kits.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Fastener Sets & Assemblies › Assortment Kits & Mixed Fastener Sets](https://engineeringhardware.com/fastener-products/fastener-sets-assemblies/assortment-kits-mixed-fastener-sets/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/auto-engine-fastener-cylinder-head-bolt-kits.md) Model no. **CYLINDER HEAD BOLT** US$1.20 / piece MOQ 1,000 pieces · Final price confirmed in your quote - **Standard Component:** Non-Standard Component - **Material:** Iron - **Heat Treatment:** Yes - **Package Size:** 25.00cm * 23.00cm * 12.00cm Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Auto%20Engine%20Fastener%20Cylinder%20Head%20Bolt%20Kits%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fauto-engine-fastener-cylinder-head-bolt-kits%2F) Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order. ## Specifications | Customization | Available | | --- | --- | | Certification | ISO9001, TS16949 | | Standard Component | Non-Standard Component | | Model NO. | CYLINDER HEAD BOLT | | Technics | Push | | Material | Iron | | Process | Forging, Casting, Billet | | Hole | Honing | | Heat Treatment | Yes | | Transport Package | Carton Box | | Specification | 38*38*20 | | Origin | China | | HS Code | 8708999990 | | Production Capacity | 1000000000 | | Package Size | 25.00cm * 23.00cm * 12.00cm | | Package Gross Weight | 1.000kg | | Category | [Assortment Kits & Mixed Fastener Sets](https://engineeringhardware.com/fastener-products/fastener-sets-assemblies/assortment-kits-mixed-fastener-sets/) | ## Technical parameters | Property | 40Cr (Quenched + Tempered) | 45# Carbon Steel | 42CrMo (High Strength Alloy) | | --- | --- | --- | --- | | Tensile Strength (MPa) | 800–1000 | 600–750 | 950–1150 | | Yield Strength (MPa) | 600–800 | 400–500 | 850–950 | | Hardness (HRC) | 28–35 | 20–25 | 32–38 | | Machinability | Good | Excellent | Moderate | | Cost | Medium | Low | High | | Standard System | Designation | Description | | --- | --- | --- | | China (GB/T 3077) | 40Cr | Medium-carbon Cr alloy steel | | AISI / SAE (USA) | 5140 | Chromium steel for heat treatment | | DIN (Germany) | 41Cr4 | Structural Cr-alloy steel | | EN (Europe) | 1.7035 | Heat-treatable structural steel | | JIS (Japan) | SCr440 | Chromium steel for mechanical use | | Element | Content (%) | Engineering Role | | --- | --- | --- | | C (Carbon) | 0.37–0.44 | Primary source of matrix strength and hardness through martensitic transformation. | | Si (Silicon) | 0.17–0.37 | Enhances tempering stability and refines ferrite grain boundaries. | | Mn (Manganese) | 0.50–0.80 | Improves hardenability, promotes uniform microstructure, and boosts toughness. | | Cr (Chromium) | 0.80–1.10 | Increases wear resistance and depth of hardening; contributes to corrosion and oxidation resistance. | | P / S (Phosphorus / Sulfur) | ≤0.035 | Controlled to minimize brittleness and ensure clean steel for machining and polishing. | | Condition | Tensile Strength (σb, MPa) | Hardness (HB/HRC) | Notes / Application | | --- | --- | --- | --- | | Annealed | ≈ 600 | ≈ 170 HB | machinability; used for rough machining or pre-forming. | | Tempered | 850–1000 | 220–260 HB | Balanced strength and toughness;con rod | | Quenched + Tempered | — | 28–32 HRC | precision mechanical; stable under fatigue loading. | | Surface Hardened | — | 50–55 HRC (surface) | induction or flame hardening; superior wear resistance while | ## Description Auto Engine Fastener Cylinder Head Bolt Kits is part of our assortment kits & mixed fastener sets range (Fastener Sets & Assemblies). ### Key details - **Material:** Iron - **Certification:** ISO9001, TS16949 - **Standard Component:** Non-Standard Component - **Technics:** Push - **Process:** Forging, Casting, Billet - **Hole:** Honing - **Heat Treatment:** Yes Available configurations include standard component, material, heat treatment and package size. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 1,000 pieces at US$1.20 per piece. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you. ## Frequently asked questions ### What is the minimum order quantity (MOQ) for Auto Engine Fastener Cylinder Head Bolt Kits? The listed minimum order is 1,000 pieces, at US$1.20 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size. ### What are the main specifications of Auto Engine Fastener Cylinder Head Bolt Kits? Material: Iron; Certification: ISO9001, TS16949; Standard Component: Non-Standard Component; Technics: Push; Process: Forging, Casting, Billet; Hole: Honing. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include standard component, material, heat treatment and package size. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing. ### What is the lead time and how is it shipped? Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment. ### Which other assortment kits & mixed fastener sets are available? The Assortment Kits & Mixed Fastener Sets category lists 3,161 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/fastener-sets-assemblies/assortment-kits-mixed-fastener-sets/](https://engineeringhardware.com/fastener-products/fastener-sets-assemblies/assortment-kits-mixed-fastener-sets/) How we work ## Specified, checked and shipped by Engineering Hardware & Fasteners Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing. - DIN, ISO, ASTM, ANSI, JIS and GB standard parts - Non-standard parts made to your drawing - Dimensions, thread gauges and plating checked before packing - Export cartons and pallets, consolidated mixed orders - Samples available for approval before mass production [![Production floor](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor-1024x683.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor.webp) Production floor [![Inspection bench](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench.webp) Inspection bench [![Sorting & packing](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-03-sorting-and-packing-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-03-sorting-and-packing.webp) Sorting & packing [![Parts warehouse](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-04-parts-warehouse-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-04-parts-warehouse.webp) Parts warehouse [![Sample review](https://engineeringhardware.com/wp-content/uploads/2026/11/office-02-office-sample-review-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-02-office-sample-review.webp) Sample review [![Sales office](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office.webp) Sales office [More about us →](https://engineeringhardware.com/about/) · [Request a sample or custom quote →](https://engineeringhardware.com/contact/) ## Request a quote for this product ## Related products [All Assortment Kits & Mixed Fastener Sets →](https://engineeringhardware.com/fastener-products/fastener-sets-assemblies/assortment-kits-mixed-fastener-sets/) [![Sems Screw Pan Head Machine Screw with Washer and Nut](https://img.engineeringhardware.com/Sems-Screw-Pan-Head-Machine-Screw-with-Washer-and-Nut.webp)](https://engineeringhardware.com/product/sems-screw-pan-head-machine-screw-with-washer-and-nut/) Assortment Kits & Mixed Fastener Sets ### [Sems Screw Pan Head Machine Screw with Washer and Nut](https://engineeringhardware.com/product/sems-screw-pan-head-machine-screw-with-washer-and-nut/) Pan Head · DIN **US$0.0012 – 0.006**MOQ 100,000 pieces [![Durable Nylon Nut Assortment Pack for DIY 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