Hex Bolts Grade 8.8
Product code — to be assigned
Quenched and tempered hex head bolts to property class 8.8, with the grade marked on the head.
- Grade 8.8 marked on the head
- Quenched and tempered
- Full or part thread
- Thread diameter
- M8 – M36 (confirm per size list)
- Property class
- 8.8
- Thread
- Full thread or part thread
- Material
- Medium carbon steel, quenched and tempered
Quoting from Handan, Hebei Province, China. Reply capacity depends on the completeness of the specification supplied with the enquiry.
Product information
Class 8.8 is the workhorse structural bolt grade: quenched and tempered medium carbon steel, roughly twice the tensile strength of a 4.8 bolt of the same diameter. The grade is stamped on the head, so what is in the joint can be checked after installation rather than trusted from the delivery note.
These are ordinary hex head bolts rather than a connection set — they are used where the connection detail calls for a specific bolt, nut and washer combination chosen by the designer. Full thread or part thread, coarse or fine pitch, all to the drawing.
Typical applications
- General structural connections
- Equipment and plant assembly
- Steelwork where a specified bolt is called for
Packing & delivery
- Boxed by diameter and length
- Grade and lot number on the label
- Palletized cartons for export
Customization (confirmed per order)
- Part thread to grip length
- Fine pitch on request
- Hot-dip galvanized for outdoor steelwork
Material & finish
- Material
- Medium carbon steel (8.8)
- Finish
- Plain · Zinc plated · Hot-dip galvanized
- Standard reference
- Dimensions follow ISO 4014 / 4017 (GB/T 5782 / 5783). Property class is confirmed by the mill certificate and the head marking for each batch.
Frequently asked questions
What is the difference between 8.8 and 10.9?
Tensile and yield strength, and the alloy. 10.9 is alloy steel with a higher preload; 8.8 is carbon steel and is the default for most building connections.
Can galvanized 8.8 bolts be used in slip-critical joints?
Only if the slip factor has been established for that coating and the project allows it. Plain or phosphated is the usual choice for slip-critical work.
Request a quotation
The product name is already attached to this form. Add the dimensions, quantity, material and finish required, and attach a drawing if one exists.
- tangtiemetal@163.com
- Phone / WhatsApp
- +86 16619861146
- Location
- Handan, Hebei Province, China
