Hex Bolts
High Tensile Hex Bolt Grade 8.8
Grade 8.8 high-tensile hex head bolts, zinc-plated or black, full and half thread. The standard choice for machinery, structural steel and heavy fabrication.
| Material | High tensile steel |
|---|---|
| Grade / property class | 8.8 |
| Sizes available | M6 to M30, Lengths 16 mm to 300 mm |
| Finish | Zinc plated (white / yellow), Black (plain), Hot-dip galvanised (on request) |
| Standards | IS 1364, DIN 931 (half thread), DIN 933 (full thread), ISO 4014 / ISO 4017 |
| Thread | Metric coarse (fine pitch on request) |
| Tensile strength | 800 MPa min |
| Yield strength | 640 MPa min |
| Brands | TVS and other leading brands |
| Price | Price on request – depends on size and quantity |
| Availability | In stock for Trichy & Thanjavur. Delivered across Tamil Nadu and all over India. |
Need a price or bulk quantity?
Send us the size and quantity on WhatsApp. Pick up in Trichy & Thanjavur, or we deliver across Tamil Nadu and all over India. We usually reply within working hours (Mon – Sat, 9:00 AM – 8:00 PM).
About High Tensile Hex Bolt Grade 8.8
Our grade 8.8 high-tensile hex bolts are the workhorse fastener for any job where ordinary mild steel bolts are not strong enough. They are heat-treated medium-carbon steel, marked 8.8 on the head, and are available in both half thread (DIN 931) and full thread (DIN 933).
Sizes and lengths
We keep the common sizes in stock, from M6 to M30, in lengths from 16 mm up to 300 mm. Popular sizes such as M8, M10, M12 and M16 are always available. For less common lengths, fine pitch threads or large quantities, send us your requirement and we will arrange it.
Finish options
- Zinc plated (white or yellow passivated) for indoor and general use with mild corrosion protection
- Black / plain for oiled machinery applications
- Hot-dip galvanised for outdoor structures (on request)
How to order
Tell us the diameter (e.g. M12), length (e.g. 60 mm), thread type (full or half), finish and quantity. If you are not sure, bring a sample to the shop.
Common applications
- Structural steel frames, sheds and trusses
- Machinery, pumps and motor bases
- Vehicle, tractor and trailer repair
- Heavy fabrication and industrial maintenance
Frequently asked questions
›What does 8.8 on a bolt head mean?
It is the property class. The first 8 means a tensile strength of about 800 MPa, and the second 8 means the yield strength is 80% of that (about 640 MPa). It is stronger than ordinary mild steel 4.6 bolts.
›Which nut should I use with an 8.8 bolt?
Use a grade 8 hex nut or higher of the same size and thread pitch. We sell matching nuts and washers.
›Do you sell in small quantities?
Yes. You can buy a single bolt for a repair or boxes and bulk quantities for projects.
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