TVS Socket Low Head Cap Screws, ISO 14580 – M4 to M10, grades 8.8, 10.9 and 12.9

TVS Sundram Fasteners Socket Low Head Cap Screws, ISO 14580 are socket head cap screws with a reduced head height, made by Sundram Fasteners Limited to IS 13274 / ISO 14580 / DIN 7984, in sizes from M4 to M10, property classes 8.8, 10.9 and 12.9, supplied in zinc phosphate and 3 plated or coated finishes (listed below). They fit where a standard socket head is too tall - thin plates, shallow counterbores and compact assemblies - while keeping the internal hexagon drive.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 850 to Rs 2,145 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 M4 to M10.
• The head must sit lower than a standard socket head - thin plates, shallow counterbores, compact assemblies.
• One of the property classes 8.8, 10.9 or 12.9 covers the load; the low head takes a smaller key and a little less torque than the standard head.

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.

• M4 x 16 mm: Rs 980 per 100 pieces
• M5 x 20 mm: Rs 925 per 100 pieces
• M6 x 25 mm: Rs 1,080 per 100 pieces
• M8 x 30 mm: Rs 1,365 per 100 pieces
• M10 x 40 mm: Rs 2,145 per 100 pieces
• Grades 12.9 and 10.9 listed, zinc phosphate (grey/black) finish; for grade 8.8 ask us for a quotation
• M14 and M16 are non-preferred sizes in SFL's list
• SFL supplies and forges low head screws by mutual discussion - delivery is confirmed on enquiry

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Socket Low Head Cap Screws, ISO 14580
• Standard: IS 13274 / ISO 14580 / DIN 7984
• Sizes: M4 to M10
• Head form: Cylindrical
• 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 850 - 2,145 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 13274 / ISO 14580 / DIN 7984
• 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
• M4: pitch 0.7; key 2.50 mm (across corners 2.87 mm); head height 2.80 mm, head diameter 7.00 mm; lengths 6 to 30 mm
• M5: pitch 0.8; key 3.00 mm (across corners 3.44 mm); head height 3.50 mm, head diameter 8.50 mm; lengths 6 to 30 mm
• M6: pitch 1.0; key 4.00 mm (across corners 4.58 mm); head height 4.00 mm, head diameter 10.00 mm; lengths 6 to 30 mm
• M8: pitch 1.25; key 5.00 mm (across corners 5.72 mm); head height 5.00 mm, head diameter 13.00 mm; lengths 8 to 50 mm
• M10: pitch 1.5; key 7.00 mm (across corners 8.01 mm); head height 6.00 mm, head diameter 16.00 mm; lengths 12 to 50 mm
• Catalogue note: unthreaded length under the head of 3 pitches maximum
• Note: dimensions are given for M4 to M10; M12, M14 and M16 are on SFL's price list (M14 and M16 as non-preferred sizes) - ask us
• Note: reduced loadability: the tensile load requirement of low head screws is 80 % of the ISO 898-1 values of the class, as SFL's price list states (ISO 14580 designates these classes 08.8, 010.9 and 012.9)
• 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 13274 / ISO 14580 / DIN 7984 - 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.
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

• thin plates and shallow counterbores
• compact assemblies and precision machinery
• electronics enclosures and fixtures

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 Low Head Cap Screws, ISO 14580?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 850 to Rs 2,145 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 low head carries less: SFL's price list rates these screws at 80 % of the ISO 898-1 tensile load of the class. Use the standard socket head where the full load is needed.

Are TVS Socket Low Head Cap Screws, ISO 14580 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 Low Head Cap Screws, ISO 14580 you need. SFL's list price is Rs 850 - 2,145 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.