TVS SunLoc Nylon Insert Nuts, DIN 985 – M8 to M48, grades 8 and 10

TVS Sundram Fasteners SunLoc Nylon Insert Nuts, DIN 985 are hexagon nuts with a nylon locking ring, made by Sundram Fasteners Limited to DIN 985, in metric sizes from M8 to M48, property classes 8 and 10, supplied in trivalent iridescent and trivalent white. SFL calls the range SunLoc. The nylon insert grips the bolt thread, so the nut resists loosening under vibration without a spring washer or thread locker, and it can be refitted a limited number of times.

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 metric coarse or fine (M sizes) - the pitches listed in the table.
• The size you need is within M8 to M48.
• The joint sees vibration or movement and you want the nut to stay put without a spring washer or thread locker.
• Service temperature stays within the limit of the nylon ring (about 120 degrees C, the ISO 2320 limit for non-metallic inserts); for hot or repeatedly dismantled joints choose the all-metal prevailing torque nut.

At a glance

• Brand: TVS Sundram Fasteners (Sundram Fasteners Limited, TVS group)
• Product: SunLoc Nylon Insert Nuts, DIN 985
• Standard: DIN 985
• Sizes: M8 to M48
• Form: hexagon
• Property class: 8 and 10
• Material: Steel
• Surface finish: trivalent iridescent and trivalent white
• Forging: cold forging, with hot forging for the larger sizes
• 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: DIN 985
• Material: high tensile steel; nut classes to ISO 898-2
• Property class: 8 and 10
• Surface finish options: trivalent iridescent and trivalent white
• Manufacture: cold forging, with hot forging for the larger sizes
• Marking: TVS brand mark on the face and the property class mark
• M8: pitch 1.0 / 1.25; across flats 13.00 mm, across corners 14.38 mm, thickness 8.00 mm
• M10: pitch 1.5 / 1.25 / 1.0; across flats 17.00 mm, across corners 18.90 mm, thickness 10.00 mm
• M12: pitch 1.75 / 1.5 / 1.25; across flats 19.00 mm, across corners 21.10 mm, thickness 12.00 mm
• M14: pitch 2.0 / 1.5; across flats 22.00 mm, across corners 24.49 mm, thickness 14.00 mm
• M16: pitch 2.0 / 1.5; across flats 24.00 mm, across corners 26.75 mm, thickness 16.00 mm
• M20: pitch 2.5 / 2.0 / 1.5; across flats 30.00 mm, across corners 32.95 mm, thickness 20.00 mm
• M24: pitch 3.0 / 2.0; across flats 36.00 mm, across corners 39.55 mm, thickness 24.00 mm
• M27: pitch 3.0 / 2.0; across flats 41.00 mm, across corners 45.20 mm, thickness 27.00 mm
• M30: pitch 3.5 / 2.0; across flats 46.00 mm, thickness 30.00 mm
• M36: pitch 4.0 / 3.0; across flats 55.00 mm, across corners 60.79 mm, thickness 36.00 mm
• M42: pitch 4.5 / 3.0; across flats 65.00 mm, across corners 72.09 mm, thickness 42.00 mm
• M48: pitch 5.0 / 3.0; across flats 75.00 mm, across corners 82.60 mm, thickness 48.00 mm
• Note: M30: across-corners figure not shown (the printed figure, 55.05, does not fit a 46.00 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 - DIN 985 - 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 (8 and 10), so site inspection is simple.
• A choice of finishes - trivalent iridescent and trivalent white - for indoor use and mild exposure.
• Keeps the joint tight under vibration without extra lock washers or thread-locking compound.

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. Match the class: class 8 nuts with 8.8 bolts, class 10 with 10.9 (nut class not lower than the bolt class).
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; the prevailing torque of the nylon ring is felt before the nut seats - that is normal, and the tightening torque must allow for it.

Where it is used

• automotive and two-wheeler assemblies
• electrical panels, fans and motors
• conveyors, vibrating screens and rotating equipment
• agricultural machinery and trailers

Other versions and series

• TVS Sundram Fasteners SunLoc Nylon Insert Nuts, DIN 982 / ISO 7040 - M6 to M27, list price Rs 280 - 15,690 per 100
• TVS Sundram Fasteners SunLoc Nylon Insert Nuts, inch UNC/UNF - 1/4" to 5/8", list price Rs 330 - 2,345 per 100
• TVS Sundram Fasteners SunLoc Nylon Insert Nuts, inch BSW/BSF - 5/16" to 5/8", list price Rs 470 - 2,445 per 100

Related products

• TVS Sundram Fasteners Hex Nuts, ISO 4032 metric - the plain hex nut
• TVS Sundram Fasteners Prevailing Torque Nuts - the all-metal lock nut

Frequently asked questions

What is the price of SunLoc Nylon Insert Nuts, DIN 985?

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.

Can a nylon insert nut be reused?

It can be refitted a few times, but the locking torque falls each time the nylon ring is cut by the thread. For joints that are opened often, or that run hot, use the all-metal prevailing torque nut instead.

Are TVS SunLoc Nylon Insert Nuts, DIN 985 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 trivalent iridescent and trivalent white; 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 SunLoc Nylon Insert Nuts, DIN 985 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.