TVS Socket Head Cap Bolts, inch BSW/BSF – 3/16" to 1", grade 80 T

TVS Sundram Fasteners Socket Head Cap Bolts, inch BSW/BSF are cylindrical-head bolts with an internal hexagon drive, made by Sundram Fasteners Limited to BS 2470, in inch (BSW/BSF) sizes from 3/16" to 1", property class 80 T, supplied in zinc phosphate. 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 1,215 to Rs 149,950 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 inch BSW or BSF (British Whitworth / fine), not UNC/UNF.
• The size you need is within 3/16" to 1".
• 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.
• Strength grade 80 T to BS 2470 (SFL's designation) covers your load.
• There is room for a counterbore or at least for the cylindrical head; otherwise look at the countersunk version.

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, BS 2470 inch series. A few sizes are shown; ask us for any other size in the range.

• 3/16" x 1-1/4" BSW: Rs 1,215 per 100 pieces
• 1/4" x 1-1/2" BSF: Rs 1,635 per 100 pieces
• 5/16" x 1-3/4" BSW: Rs 1,795 per 100 pieces
• 3/8" x 1-3/4" BSF: Rs 3,155 per 100 pieces
• 7/16" x 2-1/4" BSW: Rs 5,165 per 100 pieces
• 1/2" x 2-1/4" BSF: Rs 5,905 per 100 pieces
• BS 2470 inch series, special grade alloy steel, zinc phosphate (grey/black) finish
• SFL's list gives one price for socket head cap screws and bolts of the same size and length (1/4" excepted); whether a given length is supplied fully threaded is confirmed on enquiry
• The list has a single 3/16" column with no screw / bolt split; the 3/16" prices are quoted with that caveat

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Socket Head Cap Bolts, inch BSW/BSF
• Standard: BS 2470
• Sizes: 3/16" to 1"
• Head form: Cylindrical
• Drive: Hexagon socket
• Thread: Partially Threaded
• Property class: 80 T
• Material: Steel
• Surface finish: zinc phosphate
• Forging: cold forging
• List price: Rs 1,215 - 149,950 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: BS 2470
• Material: high tensile alloy steel; strength grade 80 T to BS 2470 (SFL's designation)
• Property class: 80 T
• Surface finish options: zinc phosphate
• Manufacture: cold forging
• Marking: TVS brand mark on the head and the property class mark
• 3/16": 24 BSW / 32 BSF tpi; socket across flats 4.03 mm (key 5/32"); head height 4.75 mm, head diameter 7.92 mm; lengths 1-1/4" to 1-3/4"
• 1/4": 20 BSW / 26 BSF tpi; socket across flats 4.83 mm (key 3/16"); head height 6.35 mm, head diameter 9.53 mm; lengths 1-1/2" to 5-1/2"
• 5/16": 18 BSW / 22 BSF tpi; socket across flats 5.55 mm (key 7/32"); head height 7.92 mm, head diameter 11.10 mm; lengths 1-3/4" to 6"
• 3/8": 16 BSW / 20 BSF tpi; socket across flats 8.03 mm (key 5/16"); head height 9.53 mm, head diameter 14.27 mm; lengths 1-3/4" to 6"
• 7/16": 14 BSW / 18 BSF tpi; socket across flats 8.03 mm (key 5/16"); head height 11.10 mm, head diameter 15.88 mm; lengths 2" to 4-1/2"
• 1/2": 12 BSW / 16 BSF tpi; socket across flats 9.63 mm (key 3/8"); head height 12.70 mm, head diameter 19.05 mm; lengths 2-1/4" to 6"
• 5/8": 11 BSW / 14 BSF tpi; socket across flats 12.83 mm (key 1/2"); head height 15.88 mm, head diameter 22.23 mm; lengths 2-1/2" to 6"
• 3/4": 10 BSW / 12 BSF tpi; socket across flats 14.43 mm (key 9/16"); head height 19.05 mm, head diameter 25.40 mm; lengths 3" to 6"
• 7/8": 9 BSW / 11 BSF tpi; socket across flats 14.43 mm (key 9/16"); head height 22.23 mm, head diameter 28.58 mm; lengths 3-1/4" to 9"
• 1": 8 BSW / 10 BSF tpi; socket across flats 16.02 mm (key 5/8"); head height 25.40 mm, head diameter 33.32 mm; lengths 3-1/2" to 9"
• Catalogue note: Threaded length TL = 2D + 1/2" (for example 1/2": 1-1/2"), 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 - BS 2470 - 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 (80 T), so site inspection is simple.
• 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. Supplied in strength grade 80 T to BS 2470 (SFL's designation), one grade only; check that it matches the design.
4. Choose the finish for the environment: zinc phosphate for indoor or oiled use.
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
• older British-standard machinery, textile and mill equipment

Other versions and series

• TVS Sundram Fasteners Socket Head Cap Bolts, ISO 4762 metric - M3 to M42, list price Rs 945 - 646,250 per 100
• TVS Sundram Fasteners Socket Head Cap Bolts, inch UNC/UNF - 1/4" to 1", list price Rs 1,615 - 149,950 per 100

Related products

• TVS Sundram Fasteners Hex Socket Keys, inch standard length - the keys that drive them
• TVS Sundram Fasteners Socket Countersunk Head Screws, inch BSW/BSF - the countersunk version

Frequently asked questions

What is the price of Socket Head Cap Bolts, inch BSW/BSF?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 1,215 to Rs 149,950 per 100 pieces across the listed sizes, for the zinc phosphate (grey/black) finish, BS 2470 inch series. 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 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.

What does grade 80 T mean?

80 T is the strength grade SFL quotes for its BS 2470 inch socket screws and bolts, made of hardened and tempered alloy steel. One grade is made; ask us for the test certificate if your design needs the figures.

Are TVS Socket Head Cap Bolts, inch BSW/BSF 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 finish is zinc phosphate; 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, inch BSW/BSF you need. SFL's list price is Rs 1,215 - 149,950 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.