TVS Hex Socket Keys, inch long length – hexagon sizes 1/16" to 5/8", hardened steel (45 to 50 HRC)

TVS Sundram Fasteners Hex Socket Keys, inch long length are L-shaped hexagon keys (Allen keys) made by Sundram Fasteners Limited to BS 2470, in inch hexagon sizes 1/16" to 5/8", hardened to 50 HRC for hexagon sizes up to 3/8"; 45 HRC for hexagon sizes above 3/8", supplied in zinc phosphate finish. They drive socket head cap screws, set screws and other internal-hexagon fasteners: the short arm goes into the socket and the long arm is the lever for torque, or the long arm goes in for reach - the long series reaches into deep counterbores and past obstructions.

SFL's retail price list of October 2026 gives recommended retail list prices from Rs 2,650 to Rs 7,045 per 100 pieces across the listed sizes; the exact price for your sizes and length series 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 three things before you order:

• Your screws have inch hexagon sockets; the key size must match the socket exactly - a loose key rounds the socket.
• The sizes you need are within hexagon sizes 1/16" to 5/8".
• You need the extra reach of the long arm - deep counterbores and recessed screws.

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 finish. A few sizes are shown; ask us for any other size in the range. 5/16", 3/8", 1/2", 9/16" and 5/8" are not on the list and are quoted on enquiry.

• 1/16 inch hex key, long: Rs 2,650 per 100 pieces
• 5/64 inch hex key, long: Rs 2,650 per 100 pieces
• 1/8 inch hex key, long: Rs 2,650 per 100 pieces
• 5/32 inch hex key, long: Rs 2,985 per 100 pieces
• 7/32 inch hex key, long: Rs 4,960 per 100 pieces
• 1/4 inch hex key, long: Rs 7,045 per 100 pieces
• Zinc phosphate finish; packed per box in 25, 10 and 5 depending on size

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: Hex Socket Keys, inch long length
• Standard: BS 2470
• Sizes: hexagon sizes 1/16" to 5/8"
• Type: L-shaped hexagon key
• Hardness: 50 HRC for hexagon sizes up to 3/8"; 45 HRC for hexagon sizes above 3/8"
• Material: Steel
• Surface finish: zinc phosphate
• List price: Rs 2,650 - 7,045 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: steel, hardened and tempered
• Hardness: 50 HRC for hexagon sizes up to 3/8"; 45 HRC for hexagon sizes above 3/8"
• Surface finish options: zinc phosphate
• 1/16": across flats 1.58 mm, across corners 1.72 mm; short arm 11.90 to 16.66 mm, long arm 73.81 to 78.58 mm
• 5/64": across flats 1.98 mm, across corners 2.15 mm; short arm 13.09 to 17.90 mm, long arm 78.58 to 83.34 mm
• 3/32": across flats 2.38 mm, across corners 2.61 mm; short arm 14.28 to 19.05 mm, long arm 83.34 to 88.10 mm
• 1/8": across flats 3.17 mm, across corners 3.53 mm; short arm 16.66 to 21.43 mm, long arm 92.86 to 97.63 mm
• 5/32": across flats 3.96 mm, across corners 4.31 mm; short arm 19.05 to 23.81 mm, long arm 102.39 to 107.15 mm
• 3/16": across flats 4.76 mm, across corners 5.33 mm; short arm 21.43 to 26.19 mm, long arm 111.91 to 116.68 mm
• 7/32": across flats 5.55 mm, across corners 6.09 mm; short arm 23.81 to 28.57 mm, long arm 121.44 to 126.20 mm
• 1/4": across flats 6.35 mm, across corners 7.11 mm; short arm 26.19 to 30.95 mm, long arm 130.96 to 135.73 mm
• 5/16": across flats 7.93 mm, across corners 8.89 mm; short arm 29.36 to 34.13 mm, long arm 150.01 to 154.78 mm
• 3/8": across flats 9.52 mm; short arm 32.54 to 37.30 mm, long arm 169.06 to 173.83 mm
• 1/2": across flats 12.70 mm, across corners 14.22 mm; short arm 38.89 to 43.65 mm, long arm 207.16 to 211.93 mm
• 9/16": across flats 14.28 mm, across corners 16.00 mm; short arm 42.06 to 46.83 mm, long arm 226.21 to 230.98 mm
• 5/8": across flats 15.87 mm, across corners 17.78 mm; short arm 45.24 to 50.00 mm, long arm 245.26 to 250.03 mm
• Note: across flats and across corners are shown the right way round (the printed table heads the columns the other way round)
• Note: standard BS 2470 (the catalogue page prints BS 2460; the index, the digital catalogue and the price list say BS 2470)
• Note: 3/8": across-corners figure not shown (the printed figure, 10.06, does not fit a 9.52 mm hexagon)
• 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.
• Hardened and accurately sized hexagon, so the key fills the socket and does not round it.

How to choose and fit

1. Choose the key by the socket size of the screw, not by the screw diameter; the screw tables on this site list the key size for each diameter.
2. Push the key fully into the socket before turning - a partly inserted key rounds the socket.
3. Short arm in the socket, long arm as the lever, for final tightening and for loosening; long arm in the socket, spun by the short arm, for speed and reach. Never extend the key with a pipe.

Where it is used

• assembly lines and toolkits
• maintenance of machines with socket head screws
• service of two-wheelers, vehicles and appliances

Other versions and series

• TVS Sundram Fasteners Hex Socket Keys, metric standard length - hexagon sizes 0.7 to 36 mm, list price Rs 1,250 - 695,810 per 100
• TVS Sundram Fasteners Hex Socket Keys, inch standard length - hexagon sizes 1/16" to 5/8", list price Rs 1,615 - 42,290 per 100
• TVS Sundram Fasteners Hex Socket Keys, metric long length - hexagon sizes 1.3 to 18 mm, list price Rs 2,650 - 18,935 per 100

Related products

• TVS Sundram Fasteners Socket Head Cap Screws, inch UNC/UNF - the screws these keys drive
• TVS Sundram Fasteners Socket Set Screws, knurled cup point, BSW - set screws with the same sockets

Frequently asked questions

What is the price of Hex Socket Keys, inch long length?

SFL's recommended retail list price effective 1 October 2026 runs from Rs 2,650 to Rs 7,045 per 100 pieces across the listed sizes, for the zinc phosphate finish. The examples above show typical sizes. Call Jai Enterprises on +91 9340081159 with your sizes, grade, finish and quantity for the exact price; key sets and other finishes are quoted on enquiry.

What is the difference between standard and long keys?

Both have the same hexagon; the long series has a longer long arm, for reach into deep counterbores and recessed screws (and more leverage when that arm is used as the lever). The dimensions are in the table above.

Are TVS Hex Socket Keys, inch long length 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, length series and quantity of Hex Socket Keys, inch long length you need. SFL's list price is Rs 2,650 - 7,045 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.