TVS Hex Head Bolts, DIN 931 old across-flats – M10, M12, M14 and M22, grades 8.8, 10.9 and 12.9

TVS Sundram Fasteners Hex Head Bolts, DIN 931 old across-flats are partially threaded hexagon head bolts made by Sundram Fasteners Limited to DIN 931 / DIN 960, in metric sizes M10, M12, M14 and M22, property classes 8.8, 10.9 and 12.9, supplied in zinc phosphate and 4 plated or coated finishes (listed below). A bolt has a plain shank under the head and a threaded length at the end, so it is the right choice where the joint is loaded in shear or where the clamped parts should sit on an unthreaded shank. Each head carries the TVS mark and the grade mark, and the parts are made by cold forging.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 1,110 to Rs 54,670 per 100 pieces across the listed sizes; the exact price for your sizes, lengths, property class and finish is confirmed on enquiry.

Jai Enterprises is an authorised distributor of TVS Sundram Fasteners high tensile fasteners and supplies them from Bhilai and Raipur all over Chhattisgarh - Bhilai, Raipur, Durg, Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India.

Is this the right one for you?

Check these five things before you order:

• Your thread is metric coarse or fine (M sizes) - the pitches listed in the table.
• The size you need is within M10, M12, M14 and M22.
• You want a plain shank under the head with the thread at the end - for shear joints or a nut on a long grip length. For thread up to the head, choose the hex head cap screw of the same standard.
• One of the property classes 8.8, 10.9 or 12.9 covers your load; the grade mark is on the head.
• You need the old DIN across-flats sizes (17, 19, 22 and 32 mm spanners) rather than the ISO ones (16, 18, 21 and 34 mm) - typically to match existing equipment.

List prices (SFL, 1 October 2026)

Prices are SFL's recommended retail list prices effective 1 October 2026, in rupees per 100 pieces, for the zinc phosphate and trivalent chrome-free finishes. A few sizes are shown; ask us for any other size in the range.

• M10 x 40 mm: Rs 1,395 per 100 pieces
• M12 x 50 mm: Rs 2,335 per 100 pieces
• M14 x 55 mm: Rs 3,730 per 100 pieces
• M22 x 205 mm: Rs 54,670 per 100 pieces
• Prices apply to the zinc phosphate and trivalent chrome-free finishes; other finishes are quoted on enquiry
• Grades 8.8 and 10.9 are listed; grade 12.9 is priced on enquiry
• An intermediate length is charged at the next listed length; lengths beyond the listed maximum are quoted on enquiry
• The list gives the same price for hex head bolts and hex head cap screws of the same size and length (M52 and M56 excepted)

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Hex Head Bolts, DIN 931 old across-flats
• Standard: DIN 931 / DIN 960
• Sizes: M10, M12, M14 and M22
• Head form: Hexagon
• Drive: Hexagon
• Thread: Partially Threaded
• Property class: 8.8, 10.9 and 12.9
• Material: Steel
• Surface finish: zinc phosphate, trivalent iridescent (8.8 & 10.9), trivalent white (8.8 & 10.9), hot dip galvanised (8.8 & 10.9) and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging
• List price: Rs 1,110 - 54,670 per 100 pieces (SFL list, 1 October 2026); exact price on enquiry
• Supplied by: Jai Enterprises, Bhilai and Raipur - to every district of Chhattisgarh and across India, +91 9340081159

Specifications and dimensions

• Standard: DIN 931 / DIN 960
• Material: high tensile steel; property classes to ISO 898-1
• Property class: 8.8, 10.9 and 12.9
• Class 8.8 (ISO 898-1, as tabulated in SFL's catalogue): tensile strength 800 MPa nominal (830 MPa minimum above 16 mm), 0.2 % proof stress 640 MPa nominal (660 MPa minimum above 16 mm), elongation 12 % minimum, hardness 230 to 300 HV (255 to 336 HV above 16 mm)
• Class 10.9 (ISO 898-1, as tabulated in SFL's catalogue): tensile strength 1,000 MPa nominal, 1,040 MPa minimum, 0.2 % proof stress 900 MPa nominal, 940 MPa minimum, elongation 9 % minimum, hardness 310 to 382 HV
• Class 12.9 (ISO 898-1, as tabulated in SFL's catalogue): tensile strength 1,200 MPa nominal, 1,220 MPa minimum, 0.2 % proof stress 1,080 MPa nominal, 1,100 MPa minimum, elongation 8 % minimum, hardness 372 to 434 HV
• Surface finish options: zinc phosphate, trivalent iridescent (8.8 & 10.9), trivalent white (8.8 & 10.9), hot dip galvanised (8.8 & 10.9) and zinc flake coating (Geomet / Magni / Delta)
• Manufacture: cold forging
• Marking: TVS brand mark on the head and the property class mark
• M10: pitch 1.5 / 1.25 / 1.0; across flats 17.00 mm, across corners 18.90 mm, head height 6.40 mm; lengths 35 to 150 mm
• M12: pitch 1.75 / 1.5 / 1.25 / 1.0; across flats 19.00 mm, across corners 21.10 mm, head height 7.50 mm; lengths 40 to 150 mm
• M14: pitch 2.0 / 1.5; across flats 22.00 mm, across corners 24.49 mm, head height 8.80 mm; lengths 45 to 150 mm
• M22: pitch 2.5 / 1.5; across flats 32.00 mm, across corners 35.72 mm, head height 14.00 mm; lengths 65 to 210 mm
• Catalogue note: Threaded length TL = 2D + 6 for lengths up to 125 mm, 2D + 12 for 130 to 200 mm and 2D + 25 for lengths above 205 mm (D = thread diameter), as printed on the SFL table
• Source: SFL's technical product catalogue (September 2026 edition) and SFL's digital product catalogue; dimensions in mm

Why choose TVS Sundram Fasteners

• Made by Sundram Fasteners Limited, a TVS group company making high tensile fasteners since 1966: first Indian company with ISO 9000, IATF 16949:2016 certified, Deming Prize 2018 for 17 plants.
• Every lot is backed by a BIS, NABL and ISO/IEC 17025 certified laboratory - tensile, fatigue, torque-tension, salt spray and coating thickness testing - as described in SFL's technical product catalogue (September 2026 edition).
• Made to a named standard - DIN 931 / DIN 960 - with the dimensions published in SFL's technical catalogue, so parts interchange with any other maker's to the same standard.
• The grade mark on each part shows its property class (8.8, 10.9 and 12.9), so site inspection is simple.
• A choice of finishes - zinc phosphate, trivalent iridescent (8.8 & 10.9), trivalent white (8.8 & 10.9), hot dip galvanised (8.8 & 10.9) and zinc flake coating (Geomet / Magni / Delta) - from plain indoor use to hot dip galvanised and zinc flake coating for outdoor and corrosive service.
• Available through Jai Enterprises in Bhilai and Raipur, with the full size range to order.

How to choose and fit

1. Pick the thread series and size from the drawing or the mating part: measure the diameter and pitch (or threads per inch) rather than guessing.
2. Choose the length: add the grip (total thickness clamped) to the nut height plus two or three threads, and check from the threaded-length note that the plain shank does not run into the nut.
3. Choose the property class the designer specified: 8.8 is the general-purpose class, 10.9 and 12.9 for higher clamp loads in the same size.
4. Choose the finish for the environment: zinc phosphate for indoor or oiled use, trivalent zinc plating for mild exposure, hot dip galvanising or zinc flake coating for outdoor and corrosive sites.
5. Tighten to the torque the design calls for, with a washer under the turned element where needed, and use a nut of matching class.

Where it is used

• structural steel connections and fabricated frames (with the matching nut and washer)
• machine foundations and base frames
• automotive chassis and tractor assemblies
• conveyors, crushers and mining equipment
• transmission towers, substations and cable trays
• maintenance stock for plants and workshops

Other versions and series

• TVS Sundram Fasteners Hex Head Bolts, ISO 4014 metric - M5 to M64, list price Rs 575 - 541,470 per 100
• TVS Sundram Fasteners Hex Head Bolts, inch UNC/UNF - 1/4" to 1-1/4", list price Rs 655 - 107,385 per 100
• TVS Sundram Fasteners Hex Head Bolts, inch BSW/BSF - 1/4" to 5/8", list price Rs 630 - 11,615 per 100

Related products

• TVS Sundram Fasteners Hex Head Cap Screws, DIN 933 old across-flats - the fully threaded version
• TVS Sundram Fasteners Hex Nuts, DIN 934 - the matching hex nut
• TVS Sundram Fasteners Plain Washers, ISO 7089 (300 to 370 HV) - the matching plain washer

Frequently asked questions

What is the price of Hex Head Bolts, DIN 931 old across-flats?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 1,110 to Rs 54,670 per 100 pieces across the listed sizes, for the zinc phosphate and trivalent chrome-free finishes. The examples above show typical sizes. Call Jai Enterprises on +91 9340081159 with your sizes, grade, finish and quantity for the exact price; grade 12.9, other finishes and non-listed lengths are quoted on enquiry.

What do the property classes 8.8, 10.9 and 12.9 mean?

They are ISO 898-1 strength classes. The first number is the nominal tensile strength in hundreds of MPa (the minimum is a little higher: 830 MPa for 8.8 above M16, 1,040 for 10.9 and 1,220 for 12.9) and the second the ratio of yield to tensile: 8.8 is 800 MPa tensile with 640 MPa yield, 10.9 is 1,000 MPa with 900 MPa yield and 12.9 is 1,200 MPa with 1,080 MPa yield (nominal values). A higher class carries more clamp load in the same size, and needs a nut of matching class.

How much of the bolt is threaded?

The threaded length depends on the bolt length, as the note under the table sets out (2D + 6, 2D + 12 or 2D + 25). If the plain shank must end at a particular point, tell us the grip length and we will check the size.

Why are there DIN and ISO pages for the same sizes?

DIN 931 / 933 use the older across-flats sizes for M10, M12, M14 and M22 (17, 19, 22 and 32 mm spanners); ISO 4014 / 4017 and IS 1364 changed these to 16, 18, 21 and 34 mm. The threads are identical, so the choice is about the spanner size and matching existing parts. All other sizes are the same in both.

Are TVS Hex Head Bolts, DIN 931 old across-flats available in Chhattisgarh?

Yes. Jai Enterprises, an authorised distributor of TVS Sundram Fasteners, supplies from Bhilai and Raipur all over Chhattisgarh and across India. Call +91 9340081159 or use the enquiry form.

Can I get a different finish or a non-listed size?

Yes. The standard finishes are zinc phosphate, trivalent iridescent (8.8 & 10.9), trivalent white (8.8 & 10.9), hot dip galvanised (8.8 & 10.9) and zinc flake coating (Geomet / Magni / Delta); other finishes, grade 12.9, and sizes or lengths outside the list are quoted on enquiry from SFL.

How to order

Call Jai Enterprises on +91 9340081159 or send an enquiry with the sizes, lengths, property class, finish and quantity of Hex Head Bolts, DIN 931 old across-flats you need. SFL's list price is Rs 1,110 - 54,670 per 100 pieces across the listed sizes (SFL list, 1 October 2026); the exact price is confirmed on enquiry. We supply from Bhilai and Raipur all over Chhattisgarh - Bhilai, Raipur, Durg, Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India.