TVS Hex Nuts, inch BSW/BSF – 1/4" to 3/4", grades P and R

TVS Sundram Fasteners Hex Nuts, inch BSW/BSF are hexagon nuts made by Sundram Fasteners Limited to BS 1083, in inch (BSW/BSF) sizes from 1/4" to 3/4", property classes P and R, supplied in zinc phosphate and 4 plated or coated finishes (listed below). They are the standard mating nuts for hex head bolts and screws of the same thread, made by cold forging, and carry the TVS mark on the face.

This item is supplied at a price on request; tell us the sizes, pitch, property class and finish you need and we will quote.

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 3/4".
• You need a plain hex nut in grade P or R (BS 1083); pair the nut grade with the bolt grade the drawing calls for.
• Vibration is not the main concern - otherwise look at the SunLoc nylon insert nuts or the prevailing torque nuts.

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Hex Nuts, inch BSW/BSF
• Standard: BS 1083
• Sizes: 1/4" to 3/4"
• Form: hexagon
• Property class: P and R
• Material: Steel
• Surface finish: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging
• Price: price on request - tell us the sizes, pitch, property class and finish
• 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 nut grades to BS 1083 (P, R)
• Property class: P and R
• 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 face and the property class mark
• 1/4": 20 BSW / 26 BSF tpi; across flats 11.30 mm, across corners 12.95 mm, thickness 5.08 mm
• 5/16": 18 BSW / 22 BSF tpi; across flats 13.33 mm, across corners 15.50 mm, thickness 6.35 mm
• 3/8": 16 BSW / 20 BSF tpi; across flats 15.24 mm, across corners 17.53 mm, thickness 7.92 mm
• 7/16": 14 BSW / 18 BSF tpi; across flats 18.03 mm, across corners 20.83 mm, thickness 9.52 mm
• 1/2": 12 BSW / 16 BSF tpi; across flats 20.82 mm, across corners 24.13 mm, thickness 11.10 mm
• 5/8": 11 BSW / 14 BSF tpi; across flats 25.65 mm, across corners 29.70 mm, thickness 14.27 mm
• 3/4": no BSW / 12 BSF tpi; across flats 30.23 mm, across corners 34.16 mm, thickness 17.20 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 (P and R), 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. Match the thread of the bolt exactly - size and pitch (or threads per inch) - from the table above.
2. Use the BS 1083 nut grade the drawing calls for (P or R in this range).
3. Fit a washer under the nut where the joint face is soft, slotted or painted.
4. Tighten to the specified torque with the bolt held.

Where it is used

• every hex bolt and screw joint of the same thread
• structural steel and fabricated frames
• automotive and tractor assemblies
• maintenance and repair stock
• older British-standard machinery, textile and mill equipment

Other versions and series

• TVS Sundram Fasteners Hex Nuts, ISO 4032 metric - M4 to M64, list price Rs 180 - 190,360 per 100
• TVS Sundram Fasteners Hex Nuts, DIN 934 - M10, M12, M14 and M22, list price Rs 335 - 4,325 per 100
• TVS Sundram Fasteners Hex Nuts, inch UNC/UNF - 1/4" to 1", list price Rs 225 - 5,880 per 100

Related products

• TVS Sundram Fasteners Hex Head Cap Screws, inch BSW/BSF - the matching hex head cap screw
• TVS Sundram Fasteners Hex Head Bolts, inch BSW/BSF - the matching hex head bolt
• TVS Sundram Fasteners SunLoc Nylon Insert Nuts, inch BSW/BSF - the locking version with a nylon insert

Frequently asked questions

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

It is supplied at a price on request. Send the sizes, grade, finish and quantity to Jai Enterprises on +91 9340081159 and we will quote from the current SFL list.

Which nut class goes with which bolt?

Use the BS 1083 nut grade the drawing calls for (P or R in this range), matched to the bolt grade. A weaker nut can strip before the bolt reaches its load.

Are TVS Hex Nuts, 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 range are quoted on enquiry from SFL.

How to order

Call Jai Enterprises on +91 9340081159 or send an enquiry with the sizes, pitch, property class, finish and quantity of Hex Nuts, inch BSW/BSF you need; they are supplied at a price on request. 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.