TVS Hex Head Bolts, inch UNC/UNF – 1/4" to 1-1/4", grades 5, 5.2 and 8

TVS Sundram Fasteners Hex Head Bolts, inch UNC/UNF are partially threaded hexagon head bolts made by Sundram Fasteners Limited to ASME B18.2.1 / BS 1768, in inch (UNC/UNF) sizes from 1/4" to 1-1/4", property classes 5, 5.2 and 8, 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, with hot forging for the larger sizes.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 655 to Rs 107,385 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 UNC or UNF (American unified), not BSW/BSF.
• The size you need is within 1/4" to 1-1/4".
• 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 5, 5.2 or 8 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
• 9/16" x 2-1/4": Rs 3,560 per 100 pieces
• Prices apply to the zinc phosphate and trivalent chrome-free finishes; other finishes are quoted on enquiry
• Grades 5 and 5.2 are listed; grade 8 is 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 UNC/UNF
• Standard: ASME B18.2.1 / BS 1768
• Sizes: 1/4" to 1-1/4"
• Head form: Hexagon
• Drive: Hexagon
• Thread: Partially Threaded
• Property class: 5, 5.2 and 8
• Material: Steel
• Surface finish: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Forging: cold forging, with hot forging for the larger sizes
• List price: Rs 655 - 107,385 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: ASME B18.2.1 / BS 1768
• Material: high tensile steel; inch grades to SAE J429 (5, 5.2, 8)
• Property class: 5, 5.2 and 8
• Surface finish options: zinc phosphate, trivalent iridescent, trivalent white, hot dip galvanised and zinc flake coating (Geomet / Magni / Delta)
• Manufacture: cold forging, with hot forging for the larger sizes
• Marking: TVS brand mark on the head and the property class mark
• 1/4": 20 UNC / 28 UNF tpi; across flats 11.12 mm, across corners 12.40 mm, head height 3.97 mm; lengths 1" to 6"; threaded length 19.05 mm
• 5/16": 18 UNC / 24 UNF tpi; across flats 12.70 mm, across corners 14.15 mm, head height 5.16 mm; lengths 1-1/8" to 6"; threaded length 22.22 mm
• 3/8": 16 UNC / 24 UNF tpi; across flats 14.27 mm, across corners 15.95 mm, head height 5.95 mm; lengths 1-1/4" to 6"; threaded length 25.40 mm
• 7/16": 14 UNC / 20 UNF tpi; across flats 15.87 mm, across corners 17.73 mm, head height 7.14 mm; lengths 1-1/2" to 6"; threaded length 28.57 mm
• 1/2": 13 UNC / 20 UNF tpi; across flats 19.05 mm, across corners 21.34 mm, head height 7.94 mm; lengths 1-5/8" to 8-1/2"; threaded length 31.75 mm
• 9/16": 12 UNC / 18 UNF tpi; across flats 20.62 mm, across corners 23.12 mm, head height 9.13 mm; lengths 2-1/8" to 6"; threaded length 34.92 mm
• 5/8": 11 UNC / 18 UNF tpi; across flats 23.82 mm, across corners 26.70 mm, head height 9.92 mm; lengths 1-7/8" to 9"; threaded length 38.10 mm
• 3/4": 10 UNC / 16 UNF tpi; across flats 28.57 mm, across corners 31.85 mm, head height 11.91 mm; lengths 2-1/2" to 8"; threaded length 44.45 mm
• 7/8": 9 UNC / 14 UNF tpi; across flats 33.32 mm, across corners 37.22 mm, head height 13.89 mm; lengths 3" to 6"; threaded length 50.80 mm
• 1": 8 UNC / 12 UNF tpi; across flats 38.1 mm, across corners 42.55 mm, head height 15.48 mm; lengths 3-1/4" to 8"; threaded length 57.15 mm
• 1-1/4": 7 UNC / 12 UNF tpi; across flats 47.62 mm, across corners 52.48 mm, head height 19.85 mm; lengths 3-3/4" to 9-1/2"; threaded length 69.90 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 - ASME B18.2.1 / BS 1768 - 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 (5, 5.2 and 8), 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 5 (SAE J429) is the general-purpose high tensile grade, grade 8 for higher clamp loads; use SAE J995 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
• imported machinery and older plant built to inch standards

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 BSW/BSF - 1/4" to 5/8", list price Rs 630 - 11,615 per 100

Related products

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

Frequently asked questions

What is the price of Hex Head Bolts, inch UNC/UNF?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 655 to Rs 107,385 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; grade 8, other finishes and non-listed lengths are quoted on enquiry.

What do the inch grades mean?

This series is made in grades 5, 5.2 and 8. 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 UNC/UNF 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 UNC/UNF you need. SFL's list price is Rs 655 - 107,385 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.