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Fastener Sets & Assemblies › Assortment Kits & Mixed Fastener Sets

Auto Engine Fastener Cylinder Head Bolt Kits

Updated 2026-11-04 · Markdown version

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

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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	383820
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

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/

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

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