TVS Hex Head Cap Screws, DIN 933 old across-flats – M10, M12, M14 and M22, grades 8.8, 10.9 and 12.9

TVS Sundram Fasteners Hex Head Cap Screws, DIN 933 old across-flats are fully threaded hexagon head screws made by Sundram Fasteners Limited to DIN 933 / DIN 961 (Old Across Flat), 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). Being fully threaded, they can be used as a screw into a tapped hole or with a nut, and the thread runs right up to the head, so a short grip length is no problem. 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 1,050 to Rs 24,205 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 fully threaded part - for a tapped hole, or a nut on a short grip length. For a plain shank under the head, choose the hex head bolt 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 90 mm: Rs 15,815 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 Cap Screws, DIN 933 old across-flats
• Standard: DIN 933 / DIN 961 (Old Across Flat)
• Sizes: M10, M12, M14 and M22
• Head form: Hexagon
• Drive: Hexagon
• Thread: Fully 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 1,050 - 24,205 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 933 / DIN 961 (Old Across Flat)
• 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 12 to 100 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 20 to 100 mm
• M14: pitch 2.0 / 1.5; across flats 22.00 mm, across corners 24.49 mm, head height 8.80 mm; lengths 25 to 100 mm
• M22: pitch 2.5 / 1.5; across flats 32.00 mm, across corners 35.72 mm, head height 14.00 mm; lengths 40 to 150 mm
• Catalogue note: unthreaded length under the head of 1 to 3 pitches
• 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 933 / DIN 961 - 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: for a nut and bolt, add the grip (total thickness clamped) to the nut height plus two or three threads; for a tapped hole, allow at least one diameter of engagement in steel.
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

• general machine building and equipment assembly
• automotive and tractor assemblies and repairs
• structural steel, platforms and handrails (with the matching nut and washer)
• pumps, motors, gearboxes and valves
• panel boards, cable trays and electrical installations
• maintenance stock for plants and workshops

Other versions and series

• TVS Sundram Fasteners Hex Head Cap Screws, ISO 4017 metric - M5 to M56, list price Rs 440 - 333,250 per 100
• TVS Sundram Fasteners Hex Head Cap Screws, inch UNC/UNF - 1/4" to 1-1/4", list price Rs 555 - 65,620 per 100
• TVS Sundram Fasteners Hex Head Cap Screws, inch BSW/BSF - 1/4" to 5/8", list price Rs 555 - 6,235 per 100

Related products

• TVS Sundram Fasteners Hex Head Bolts, DIN 931 old across-flats - the same head with a plain shank
• 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 Cap Screws, DIN 933 old across-flats?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 1,050 to Rs 24,205 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.

What is the difference between a hex head cap screw and a hex head bolt?

Both have the same hexagon head; the screw is threaded all the way to the head, the bolt has a plain shank under the head and is threaded only at the end. Use the screw for tapped holes and short grips, the bolt where the clamped parts should bear on a plain shank. The bolts are on the matching bolt page.

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 Cap Screws, DIN 933 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 Cap Screws, DIN 933 old across-flats you need. SFL's list price is Rs 1,050 - 24,205 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.