TVS Hex Head Bolts, inch BSW/BSF – 1/4" to 5/8", grades R, S, T and V

TVS Sundram Fasteners Hex Head Bolts, inch BSW/BSF are partially threaded hexagon head bolts made by Sundram Fasteners Limited to BS 1083, in inch (BSW/BSF) sizes from 1/4" to 5/8", property classes R, S, T and V, supplied in zinc phosphate and 4 plated or coated finishes (listed below). A bolt has a plain shank under the head and a threaded length at the end, so it is the right choice where the joint is loaded in shear or where the clamped parts should sit on an unthreaded shank. 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 630 to Rs 11,615 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 inch BSW or BSF (British Whitworth / fine), not UNC/UNF.
• The size you need is within 1/4" to 5/8".
• You want a plain shank under the head with the thread at the end - for shear joints or a nut on a long grip length. For thread up to the head, choose the hex head cap screw of the same standard.
• One of the property classes R, S, T or V covers your load; the grade mark is on the 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 and trivalent chrome-free finishes. A few sizes are shown; ask us for any other size in the range.

• 1/4" x 1": Rs 655 per 100 pieces
• 5/16" x 1-1/4": Rs 780 per 100 pieces
• 3/8" x 1-1/2": Rs 1,120 per 100 pieces
• 7/16" x 1-3/4": Rs 1,695 per 100 pieces
• 1/2" x 2": Rs 2,675 per 100 pieces
• 5/8" x 2-1/2": Rs 5,365 per 100 pieces
• Prices apply to the zinc phosphate and trivalent chrome-free finishes; other finishes are quoted on enquiry
• Grade R is listed; the other BS 1083 grades (S, T and V - grades J and T in the wording of the list) are 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 (1/4" excepted)

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Hex Head Bolts, inch BSW/BSF
• Standard: BS 1083
• Sizes: 1/4" to 5/8"
• Head form: Hexagon
• Drive: Hexagon
• Thread: Partially Threaded
• Property class: R, S, T and V
• Material: Steel
• Surface finish: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging
• List price: Rs 630 - 11,615 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 1083
• Material: high tensile steel; inch grades to BS 1083 (R, S, T, V)
• Property class: R, S, T and V
• Surface finish options: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Manufacture: cold forging
• Marking: TVS brand mark on the head and the property class mark
• 1/4": 20 BSW / 26 BSF tpi; across flats 11.30 mm, across corners 12.95 mm, head height 4.47 mm; lengths 3/4" to 6"; threaded length 12.70 mm
• 5/16": 18 BSW / 22 BSF tpi; across flats 13.33 mm, across corners 15.50 mm, head height 5.53 mm; lengths 7/8" to 6"; threaded length 15.88 mm
• 3/8": 16 BSW / 20 BSF tpi; across flats 15.24 mm, across corners 17.53 mm, head height 6.60 mm; lengths 1" to 6"; threaded length 19.05 mm
• 7/16": 14 BSW / 18 BSF tpi; across flats 18.03 mm, across corners 20.83 mm, head height 7.67 mm; lengths 1-1/4" to 5-1/2"; threaded length 22.22 mm
• 1/2": 12 BSW / 16 BSF tpi; across flats 20.82 mm, across corners 24.13 mm, head height 8.71 mm; lengths 1-3/8" to 6"; threaded length 25.40 mm
• 5/8": 11 BSW / 14 BSF tpi; across flats 25.65 mm, across corners 29.70 mm, head height 10.59 mm; lengths 1-3/4" to 6"; threaded length 31.75 mm
• 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 1083 - 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 (R, S, T and V), so site inspection is simple.
• A choice of finishes - zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised 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: 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 grade the designer specified: grade R (BS 1083) is the general-purpose high tensile grade, S, T and V for higher clamp loads; use nuts of matching grade.
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

• structural steel connections and fabricated frames (with the matching nut and washer)
• machine foundations and base frames
• automotive chassis and tractor assemblies
• conveyors, crushers and mining equipment
• transmission towers, substations and cable trays
• maintenance stock for plants and workshops
• older British-standard machinery, textile and mill equipment

Other versions and series

• TVS Sundram Fasteners Hex Head Bolts, ISO 4014 metric - M5 to M64, list price Rs 575 - 541,470 per 100
• TVS Sundram Fasteners Hex Head Bolts, DIN 931 old across-flats - M10, M12, M14 and M22, list price Rs 1,110 - 54,670 per 100
• TVS Sundram Fasteners Hex Head Bolts, inch UNC/UNF - 1/4" to 1-1/4", list price Rs 655 - 107,385 per 100

Related products

• TVS Sundram Fasteners Hex Head Cap Screws, inch BSW/BSF - the fully threaded version
• TVS Sundram Fasteners Hex Nuts, inch BSW/BSF - the matching hex nut

Frequently asked questions

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

SFL's recommended retail list price effective 1 October 2026 runs from Rs 630 to Rs 11,615 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; grades S, T and V, other finishes and non-listed lengths are quoted on enquiry.

What do the inch grades mean?

This series is made in grades R, S, T and V. Grades 5, 5.2 and 8 are the SAE J429 strength grades used with UNC/UNF threads; R, S, T and V are the BS 1083 strength grades used with BSW/BSF threads. The grade mark is on the head. Ask us which grade the equipment calls for if the drawing does not say.

How much of the bolt is threaded?

The threaded length for each size is given in the table above (SFL lists one threaded length per size). If the plain shank must end at a particular point, tell us the grip length and we will check the size.

Are TVS Hex Head 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 finishes are zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised 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 Hex Head Bolts, inch BSW/BSF you need. SFL's list price is Rs 630 - 11,615 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.