TVS Socket Button Head Screws, ISO 7380-1 – M3 to M16, grades 8.8, 10.9 and 12.9

TVS Sundram Fasteners Socket Button Head Screws, ISO 7380-1 are low, rounded (button) head screws with an internal hexagon drive, made by Sundram Fasteners Limited to IS 15425 / ISO 7380-1, in sizes from M3 to M16, property classes 8.8, 10.9 and 12.9, supplied in zinc phosphate and 3 plated or coated finishes (listed below). The domed head gives a neat finish with no sharp edges and sits lower than a socket head cap screw, for covers, panels and guards where appearance and clearance matter.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 780 to Rs 6,515 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 four things before you order:

• Your thread is metric coarse pitch (M sizes).
• The size you need is within M3 to M16.
• A domed, low head with no sharp edges suits the job - covers, panels, guards, handrails and visible assemblies.
• One of the property classes 8.8, 10.9 or 12.9 covers the load; a button head carries less than a socket head cap screw of the same size.

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. M16 is not on the list and is quoted on enquiry.

• M3 x 12 mm: Rs 1,640 per 100 pieces
• M4 x 16 mm: Rs 900 per 100 pieces
• M5 x 20 mm: Rs 995 per 100 pieces
• M6 x 25 mm: Rs 1,350 per 100 pieces
• M8 x 30 mm: Rs 1,815 per 100 pieces
• M10 x 40 mm: Rs 2,965 per 100 pieces
• Grades 12.9 and 10.9 listed, zinc phosphate (grey/black) finish; for grade 8.8 ask us for a quotation

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Socket Button Head Screws, ISO 7380-1
• Standard: IS 15425 / ISO 7380-1
• Sizes: M3 to M16
• Head form: Button (SFL lists it as "button with collar"; the head dimensions in the table are those of ISO 7380-1)
• Drive: Hexagon socket
• 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) and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging
• List price: Rs 780 - 6,515 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 15425 / ISO 7380-1
• 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
• Marking: TVS brand mark on the head and the property class mark
• M3: pitch 0.5; key 2.00 mm (across corners 2.30 mm); head height 1.65 mm, head diameter 5.70 mm; lengths 6 to 25 mm
• M4: pitch 0.7; key 2.50 mm (across corners 2.87 mm); head height 2.20 mm, head diameter 7.60 mm; lengths 6 to 35 mm
• M5: pitch 0.8; key 3.00 mm (across corners 3.44 mm); head height 2.75 mm, head diameter 9.50 mm; lengths 8 to 40 mm
• M6: pitch 1.0; key 4.00 mm (across corners 4.58 mm); head height 3.30 mm, head diameter 10.50 mm; lengths 8 to 50 mm
• M8: pitch 1.25; key 5.00 mm (across corners 5.72 mm); head height 4.40 mm, head diameter 14.00 mm; lengths 10 to 50 mm
• M10: pitch 1.5; key 6.00 mm (across corners 6.86 mm); head height 5.50 mm, head diameter 17.50 mm; lengths 12 to 60 mm
• M12: pitch 1.75; key 8.00 mm (across corners 9.14 mm); head height 6.60 mm, head diameter 21.00 mm; lengths 16 to 90 mm
• M16: pitch 2.0; key 10.00 mm (across corners 11.42 mm); head height 8.80 mm, head diameter 28.00 mm; lengths 20 to 50 mm
• Catalogue note: unthreaded length under the head of 3 pitches maximum
• 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 15425 / ISO 7380-1 - 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.

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: 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.

Where it is used

• covers, panels and guards
• handrails, furniture and fittings
• two-wheelers and consumer equipment
• displays and enclosures

Related products

• TVS Sundram Fasteners Socket Head Cap Screws, ISO 4762 metric - the standard socket head cap screw
• TVS Sundram Fasteners Hex Socket Keys, metric standard length - the keys that drive them

Frequently asked questions

What is the price of Socket Button Head Screws, ISO 7380-1?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 780 to Rs 6,515 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; other finishes and sizes outside the list 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.

Does the smaller head reduce the strength?

The thread is made to the same property class, but the head is smaller, so the screw should not be loaded to the full value of a standard socket head cap screw. Use the standard head where the full load is needed.

Are TVS Socket Button Head Screws, ISO 7380-1 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 Button Head Screws, ISO 7380-1 you need. SFL's list price is Rs 780 - 6,515 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.