TVS/Sundaram Fasteners high tensile hex head bolt

Hex Head Bolts & Screws

TVS/Sundaram Fasteners Hex Bolts

High-tensile hex bolts and hex head screws in Grade 8.8, 10.9 and stainless steel — half-thread (DIN 931) and full-thread (DIN 933) — stocked in Mumbai and dispatched across India.

Also calledHex boltHexagon boltNut boltHT bolt8.8 bolt

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Overview

About our hex bolts & nuts range

Perfect Engineering Co (Dharam Fasteners, est. 1960) is an authorized stockist of TVS/Sundaram Fasteners hex bolts, manufactured in Chennai. We hold ready stock of TVS/Sundaram Fasteners hex head bolts and screws in metric sizes from M5 to M36 along with matching TVS/Sundaram Fasteners hex nuts and washers, so OEM lines and maintenance teams can order complete sets from one supplier.

Alongside TVS/Sundaram Fasteners, we supply hex bolts from Unbrako, LPS and economical local makes, plus stainless steel hex bolts in SS 304 and SS 316. Bolts conform to IS 1363/1364, DIN 931, DIN 933 and ISO 4014/4017, with inch series (BSW, UNC, UNF) available on request.

Common sizes we supply: M6, M8, M10, M12, M14, M16, M20, M24 and M30 — for example M8 x 25, M10 x 40, M12 x 50, M12 x 75, M16 x 60, M16 x 100, M20 x 80 and M24 x 100 — in grade 8.8 and 10.9, plus 1/4" to 1" BSW / UNC.

Also known in the trade as: Hex bolt, Hexagon bolt, Nut bolt, HT bolt, 8.8 bolt, 10.9 bolt, Hex head screw, Full thread bolt, Half thread bolt, SS hex bolt.

Genuine TVS/Sundaram Fasteners (Sundram Fasteners Ltd) M24 x 3 x 180 hex bolt grade 10.9 with original box – Perfect Engineering Co, Mumbai — Genuine TVS/Sundaram Fasteners M24 × 180 hex bolt, grade 10.9 — shown with its original box.

Makes / Suppliers

Available makes

TVS/Sundaram FastenersChennai · Genuine stock

UnbrakoPrecision socket products

LPSLakshmi Precision Screws, Rohtak

Local MakeEconomical everyday grade

Specifications

Technical specifications

Material: High-tensile alloy steel · Carbon steel · Stainless steel SS 202 / 304 / 316
Grade / Property Class: 4.6, 8.8, 10.9, 12.9 · Stainless A2-70, A4-70, A4-80
Standards: IS 1363 / IS 1364 · DIN 931 (half thread) · DIN 933 (full thread) · ISO 4014 / 4017 · Inch: BS 1083, ANSI B18.2.1
Diameter: Metric M5 – M56 · Inch 3/16" – 2"
Length: 10 mm – 500 mm · Inch 3/8" – 20"
Thread: Metric coarse (standard) · Fine pitch, BSW, UNC, UNF on request

Coatings & Finishes

Finishes available

Black Oxide / Self Colour

Standard heat-treated finish with light oil. Default for high-tensile grades 8.8–12.9.

Zinc Plated – White / Clear

Bright silver electroplate for indoor corrosion protection.

Zinc Plated – Yellow

Yellow-passivated zinc with better salt-spray life than clear zinc.

Hot-Dip Galvanized (HDG)

Thick zinc coating for outdoor, structural, and construction use.

Zinc Flake (Geomet / Dacromet)

Non-electrolytic coating with high corrosion resistance and no hydrogen embrittlement — preferred for 10.9 & 12.9.

Zinc-Nickel

Automotive-grade plating with very high salt-spray resistance.

Stainless Steel SS 304 (A2)

Natural finish; general corrosion resistance for food, pharma, and outdoor use.

Stainless Steel SS 316 (A4)

Molybdenum grade for marine, chemical, and coastal environments.

Stainless Steel SS 202

Economical stainless for light-duty and decorative fastening.

Sizes

Hex bolt size chart (metric, ISO 4014 / DIN 931)

Size	Pitch (mm)	Across Flats (mm)	Head Height (mm)	Typical Lengths
M5	0.8	8	3.5	10 – 60 mm
M6	1.0	10	4.0	10 – 100 mm
M8	1.25	13	5.3	12 – 150 mm
M10	1.5	16 (17*)	6.4	16 – 200 mm
M12	1.75	18 (19*)	7.5	20 – 250 mm
M14	2.0	21 (22*)	8.8	25 – 250 mm
M16	2.0	24	10.0	30 – 300 mm
M18	2.5	27	11.5	35 – 300 mm
M20	2.5	30	12.5	40 – 300 mm
M22	2.5	34 (32*)	14.0	50 – 300 mm
M24	3.0	36	15.0	50 – 300 mm
M27	3.0	41	17.0	60 – 300 mm
M30	3.5	46	18.7	60 – 300 mm
M36	4.0	55	22.5	80 – 300 mm

* Older DIN 931 / IS across-flats sizes — both revised (ISO) and older A/F are available. Lengths listed are typical ranges; ask for non-standard lengths.

FAQ

Common questions

What is the difference between DIN 931 and DIN 933 hex bolts?

DIN 931 bolts are partially threaded with a plain shank under the head, used where the bolt takes shear load. DIN 933 hex screws are fully threaded up to the head, used for clamping and general assembly.

Do you stock genuine TVS/Sundaram Fasteners hex bolts?

Yes. Perfect Engineering Co is an authorized stockist of TVS/Sundaram Fasteners products. All TVS/Sundaram Fasteners stock comes with genuine head markings and packaging.

Which grade of hex bolt should I use?

Grade 8.8 suits most machinery and structural work. Grade 10.9 is used for high-load joints such as automotive and heavy equipment. Stainless SS 304 or SS 316 is used where corrosion resistance matters more than strength.

Do you deliver outside Mumbai?

Yes. We dispatch same day within Mumbai and ship across India by transport or courier.