TVS Socket Head Cap Bolts, ISO 4762 metric – M3 to M42, grades 8.8, 10.9 and 12.9

TVS Sundram Fasteners Socket Head Cap Bolts, ISO 4762 metric are cylindrical-head bolts with an internal hexagon drive, made by Sundram Fasteners Limited to IS 2269 / ISO 4762 / DIN 912, in metric sizes from M3 to M42, property class 8.8, 10.9 and 12.9, supplied in zinc phosphate and 3 plated or coated finishes (listed below). They are partially threaded, with a plain shank under the head. Socket head cap screws sit in a counterbore flush with the surface and take high torque from a small key, which is why they are the standard fastener on machine tools, dies, jigs and equipment where space around the head is tight.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 945 to Rs 646,250 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 pitch (M sizes).
• The size you need is within M3 to M42.
• You want a plain shank under the head (partially threaded). For thread up to the head, choose the socket head cap screw of the same standard.
• One of the property classes 8.8, 10.9 or 12.9 covers your load; 12.9 is the usual choice for machine building, 8.8 and 10.9 where a lower strength is specified.
• There is room for a counterbore or at least for the cylindrical head; otherwise look at the low head or button head versions.

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 (grey/black) finish, grades 12.9 and 10.9. A few sizes are shown; ask us for any other size in the range.

• M3 x 25 mm: Rs 945 per 100 pieces
• M4 x 30 mm: Rs 1,055 per 100 pieces
• M5 x 30 mm: Rs 980 per 100 pieces
• M6 x 35 mm: Rs 1,180 per 100 pieces
• M8 x 40 mm: Rs 1,430 per 100 pieces
• M10 x 45 mm: Rs 2,055 per 100 pieces
• Grades 12.9 and 10.9 listed, zinc phosphate (grey/black) finish; for grade 8.8 ask us for a quotation
• SFL's list gives one price for socket head cap screws and bolts of the same size and length; whether a given length is supplied fully threaded is confirmed on enquiry

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Socket Head Cap Bolts, ISO 4762 metric
• Standard: IS 2269 / ISO 4762 / DIN 912
• Sizes: M3 to M42
• Head form: Cylindrical
• Drive: Hexagon socket
• 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) and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging, with hot forging for the larger sizes
• List price: Rs 945 - 646,250 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: IS 2269 / ISO 4762 / DIN 912
• 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) and zinc flake coating (Geomet / Magni / Delta)
• Manufacture: cold forging, with hot forging for the larger sizes
• Marking: TVS brand mark on the head and the property class mark
• M3: pitch 0.5; key 2.5 mm (across corners 2.87 mm); head height 3.00 mm, head diameter 5.50 mm; lengths 25 to 30 mm
• M4: pitch 0.7; key 3.0 mm (across corners 3.44 mm); head height 4.00 mm, head diameter 7.00 mm; lengths 30 to 70 mm
• M5: pitch 0.8; key 4.0 mm (across corners 4.58 mm); head height 5.00 mm, head diameter 8.50 mm; lengths 30 to 70 mm
• M6: pitch 1.0; key 5.0 mm (across corners 5.72 mm); head height 6.00 mm, head diameter 10.0 mm; lengths 35 to 150 mm
• M8: pitch 1.25; key 6.0 mm (across corners 6.86 mm); head height 8.00 mm, head diameter 13.0 mm; lengths 40 to 150 mm
• M10: pitch 1.5; key 8.0 mm (across corners 9.15 mm); head height 10.00 mm, head diameter 16.0 mm; lengths 45 to 150 mm
• M12: pitch 1.75; key 10.0 mm (across corners 11.43 mm); head height 12.00 mm, head diameter 18.0 mm; lengths 50 to 200 mm
• M14: pitch 2.0; key 12.0 mm (across corners 13.72 mm); head height 14.00 mm, head diameter 21.0 mm; lengths 60 to 200 mm
• M16: pitch 2.0; key 14.0 mm (across corners 16.00 mm); head height 16.00 mm, head diameter 24.0 mm; lengths 60 to 200 mm
• M18: pitch 2.5; key 14.0 mm (across corners 16.00 mm); head height 18.00 mm, head diameter 27.0 mm; lengths 70 to 200 mm
• M20: pitch 2.5; key 17.0 mm (across corners 19.43 mm); head height 20.00 mm, head diameter 30.0 mm; lengths 75 to 300 mm
• M22: pitch 2.5; key 17.0 mm (across corners 19.43 mm); head height 22.00 mm, head diameter 33.0 mm; lengths 80 to 200 mm
• M24: pitch 3.0; key 19.0 mm (across corners 21.73 mm); head height 24.00 mm, head diameter 36.0 mm; lengths 80 to 300 mm
• M27: pitch 3.0; key 19.0 mm (across corners 21.73 mm); head height 27.00 mm, head diameter 40.0 mm; lengths 100 to 300 mm
• M30: pitch 3.5; key 22.0 mm (across corners 25.15 mm); head height 30.00 mm, head diameter 45.0 mm; lengths 100 to 300 mm
• M33: pitch 3.5; key 24.0 mm (across corners 27.43 mm); head height 33.00 mm, head diameter 50.0 mm; lengths 100 to 300 mm
• M36: pitch 4.0; key 27.0 mm (across corners 30.85 mm); head height 36.00 mm, head diameter 54.0 mm; lengths 110 to 300 mm
• M42: pitch 4.5; key 32.0 mm (across corners 36.57 mm); head height 42.00 mm, head diameter 63.0 mm; lengths 140 to 300 mm
• Catalogue note: Threaded length TL = 2D + 12 for any length (for example M30 x 3.5 x 100: TL = 72 mm), 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 - IS 2269 / ISO 4762 / DIN 912 - 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) and zinc flake coating (Geomet / Magni / Delta) - from plain indoor use to 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: 12.9 is the usual choice for socket screws in machine building; 8.8 and 10.9 where the design calls for a lower class or a plated finish.
4. Choose the finish for the environment: zinc phosphate for indoor or oiled use, trivalent zinc plating for mild exposure, 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.
6. Use a hex key of the exact socket size; the key size for each diameter is in the table above.

Where it is used

• machine tools, dies, moulds, jigs and fixtures
• hydraulic and pneumatic equipment
• robotics, automation and material handling
• pumps, compressors and gearboxes
• automotive and two-wheeler engines

Other versions and series

• TVS Sundram Fasteners Socket Head Cap Bolts, inch UNC/UNF - 1/4" to 1", list price Rs 1,615 - 149,950 per 100
• TVS Sundram Fasteners Socket Head Cap Bolts, inch BSW/BSF - 3/16" to 1", list price Rs 1,215 - 149,950 per 100

Related products

• TVS Sundram Fasteners Hex Socket Keys, metric standard length - the keys that drive them
• TVS Sundram Fasteners Socket Low Head Cap Screws, ISO 14580 - the low head version
• TVS Sundram Fasteners Socket Button Head Screws, ISO 7380-1 - the button head version

Frequently asked questions

What is the price of Socket Head Cap Bolts, ISO 4762 metric?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 945 to Rs 646,250 per 100 pieces across the listed sizes, for the zinc phosphate (grey/black) finish, grades 12.9 and 10.9. The examples above show typical sizes. Call Jai Enterprises on +91 9340081159 with your sizes, grade, finish and quantity for the exact price; grade 8.8, 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 key size does it take?

The hexagon socket (key) size for each diameter is in the table above. Use a key of that exact size, pushed fully home; a smaller key will round the socket.

Why is 12.9 the usual grade for socket screws?

Socket head cap screws are mostly used in machine building, where a small head must carry a high clamp load; class 12.9 (1,200 MPa tensile) gives that. 8.8 and 10.9 are made for designs that specify them.

Are TVS Socket Head Cap Bolts, ISO 4762 metric 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) and zinc flake coating (Geomet / Magni / Delta); other finishes 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 Socket Head Cap Bolts, ISO 4762 metric you need. SFL's list price is Rs 945 - 646,250 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.