ISO 898-1 Class 8.8 Bolts: Precision Developed by Bigboltnut 

Bigboltnut specialises in producing high-strength industrial fasteners that match international specifications. Our ISO 898-1 Class 8.8 bolts are designed for maximum durability, making them ideal for heavy-duty applications in the construction, automotive, and engineering industries. 

What makes ISO 898-1 Class 8.8 bolts the best option?

They come as ISO 898-1 Class 8.8 made from medium-carbon steel with heat treating that gives strength and great durability in extreme working conditions.

At Bigboltnut, we test every bolt to assure quality, ensuring they will perform well in heavy-duty applications.

Grade 8.8 Hardness and Strength

These bolts are suited for industrial and structural applications due to their hardness grade of 8.8. These fasteners have a tensile strength of about 800 MPa and a grade 8.8 bolt yield strength (MPa) of at least 640 MPa, assuring long-term performance. 

Class 8.8: Hardness and Mechanical Properties

Bolts of hardness class 8.8 are meant to be extremely long-lasting. They are perfect for equipment, steel structures, and critical applications needing accuracy and dependability because of their exceptional tensile strength and resistance to wear. 

ISO 898-1 Equivalent Materials

For clients looking for ISO 898-1 comparable material, our Bigboltnut fasteners meet global criteria like ASTM A325, DIN 933, and EN 15048. These equivalents provide compliance with worldwide engineering and industrial standards, allowing for greater flexibility across projects. 

8.8 Grade Bolt Specifications 

The 8.8 grade bolt specification provides a variety of designs and coatings to improve performance.

- The types available are hex bolts, socket head bolts, and countersunk bolts. 

- The coatings consist of zinc plating, hot-dip galvanisation, and black oxide, which serve to protect against corrosion. 

- Available in both custom and standard dimensions for different applications. 

Why Choose Bigboltnut for Grade 8.8 Bolts?

Bigboltnut is dedicated to manufacturing high-quality fasteners utilising precision engineering and rigorous quality assurance processes. This outlines the reasons for customer trust in our organisation. 

Our bolts achieve or exceed the ISO 898-1 Class 8.8 standards, ensuring high strength and durability for optimal performance. 

Industries that depend on Bigboltnut's Grade 8.8 bolts 

- Construction and Infrastructure: Bridges, highways, and steel frames 

- Automotive & Heavy Machinery: Engine components, machine assembly

- The Energy Sector: Power plants, wind farms, and industrial developments. 

- Railways and Transportation: High-load applications that require high strength 

Order high-performance ISO 898-1 Class 8.8 bolts at Bigboltnut

Bigboltnut, a company that has been a leading manufacturer of industrial fasteners for decades, is the perfect choice for high-quality ISO 898-1 Class 8.8 bolts. We can make it to your specific requirements, be they standard specifications or custom-engineered solutions.

Mechanical properties of fasteners made of carbon steel and alloy steel Grade 8.8

The Grade 8.8 Bolts, screws, and studs with specified property classes — coarse thread and fine pitch thread

The ISO 898-1:2013 Grade 8.8 specification covers carbon steel bolts and studs ranging from M-6 to M-64 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties in grade 8.8 standard. There are three popular grades in this standard, 8.8, 10.9 and 12.9 which denote material hardness strength and their respective mechanical properties.

ISO 898-1:2013 Grade 8.8

8.8

Hex bolts, screws, stud bolts, double ended studs, full thread rods, full threaded studs

ISO 898-1:2013 grade 8.8 Chemical properties

Property class	Material and heat treatment	Chemical composition limit (cast analysis, %)a					Tempering temperature ⁰C Min.
		C		P	S	Bb
		min.	max.	max.	max.	max.
8.8f	Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered	0,15e	0,40	0,025	0,025	0,003	425
	Carbon steel quenched and tempered	0,25	0,55	0,025	0,025
	Alloy steel quenched and temperedg	0,20	0,55	0,025	0,025

ISO 898-1:2013 grade 8.8 Mechanical properties

Mechanical or physical property		Tensile strength, Rm, MPa		Stress at 0,2 % non-proportional elongation, Rp0,2, MPa		Stress under proof load, Spf, MPa	Proof strength ratioSp,nom/ReL,min	Percentage elongation after fracture for machined test pieces, A, %	Percentage reduction of area after fracture for machined test pieces, Z, %	Height of non-decarburized thread zone, E, mm	Depth of complete decarburization in the thread, G, mm	Reduction of hardness after retempering, HV	Impact strength, KVij, J
		nom.c	min.	nom.c	min.	nom.		min.	min.	min.	max.	max.	min.
8.8	d≤ 16 mma	800	800	640	640	580	0,91	12	52	1/2 H1	0,015	20	27
	d> 16 mmb		830	640	660	600	0,91				0,016	21	27

ISO 898-1:2013 grade 8.8 Recommended hardness

Mechanical or physical property		Vickers hardness, HV F ≥98 N		Brinell hardness, HBW F = 30 D2		Rockwell hardness, HRC		Surface hardness, HV 0,3
		min.	max.	min.	max.	min.	max.	max.
8.8	D ≤ 16 mma	250	320	245	316	22	32	-
	D > 16 mmb	255	335	250	331	23	34	-

Contact us today for all of your custom or bulk bolt needs!