Simfix

M10 Nylon Insert Nut 20 Pack DIN 985 A4-80 A4 Stainless Steel

SKU 985A410PK20-SIM
1000+ in stockReady to dispatch
£13.20
Pack size:
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M10 nyloc nut in A4 marine grade stainless steel to DIN 985. The nylon insert grips the bolt thread under vibration and dynamic loading, resisting loosening without thread locking compound - and re-usable after removal. A4 (316) marine grade gives outstanding resistance to saltwater and chloride corrosion - the right choice for coastal, marine, and pool environments. Free next-day UK delivery on orders over £50.
£13.20

M10 nyloc nut in A4 marine grade stainless steel to DIN 985. The nylon insert grips the bolt thread under vibration and dynamic loading, resisting loosening without thread locking compound - and re-usable after removal. A4 (316) marine grade gives outstanding resistance to saltwater and chloride corrosion - the right choice for coastal, marine, and pool environments. Free next-day UK delivery on orders over £50.
  • M10 nyloc nut marine grade 316 DIN 985
  • DIN 985 nylon insert nut M10 A4 marine grade stainless steel, side view
  • Nylon insert detail - M10 A4 stainless nyloc nut DIN 985
  • Nylon Insert Nut in a real-life marine application. The nylon insert helps resist loosening from vibration.
  • Simfix product label - 985A410PK20-SIM
  • Simfix product label - 985A410PK100-SIM
M10 nyloc nut marine grade 316 DIN 985
DIN 985 nylon insert nut M10 A4 marine grade stainless steel, side view
Nylon insert detail - M10 A4 stainless nyloc nut DIN 985
Nylon Insert Nut in a real-life marine application. The nylon insert helps resist loosening from vibration.
Simfix product label - 985A410PK20-SIM
Simfix product label - 985A410PK100-SIM
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M10 nyloc nut marine grade 316 DIN 985 DIN 985 nylon insert nut M10 A4 marine grade stainless steel, side view Nylon insert detail - M10 A4 stainless nyloc nut DIN 985 Nylon Insert Nut in a real-life marine application. The nylon insert helps resist loosening from vibration. Simfix product label - 985A410PK20-SIM Simfix product label - 985A410PK100-SIM
M10 nyloc nut marine grade 316 DIN 985 DIN 985 nylon insert nut M10 A4 marine grade stainless steel, side view Nylon insert detail - M10 A4 stainless nyloc nut DIN 985 Nylon Insert Nut in a real-life marine application. The nylon insert helps resist loosening from vibration. Simfix product label - 985A410PK20-SIM Simfix product label - 985A410PK100-SIM

This M10 nyloc lock nut is manufactured to DIN 985 in A4 stainless steel (316 marine grade). DIN 985 specifies a standard hex nut body with a nylon insert in the upper portion of the thread. As the bolt passes through, the nylon insert deforms around the thread and creates a prevailing torque that resists loosening under vibration and dynamic loading. Unlike chemical thread lock, the nylon insert remains effective after removal and re-fitting multiple times, making it practical for assemblies that require periodic maintenance access.

Typical applications

  • Marine and coastal assemblies where vibration lock is critical
  • Boat deck fittings, marina pontoons, and offshore structures
  • Swimming pool plant and chemical process equipment
  • Coastal fencing, handrailing, and outdoor furniture in saltwater zones

Available in packs of 20 to 100, with free next-day UK delivery on orders over £50 and 30-day no-quibble returns.

*Photos, diagrams and other images are for illustration only and may not show the exact item supplied. Simfix reserves the right to alter or replace any photo, diagram or image at any time at its sole discretion.

**Orders that cannot be split will be rounded up to the next full pack or box quantity.

Simfix reserves the right to change quantities, stock levels and prices at any time. We accept no liability for the accuracy of dimensional data, DIN/ISO references, technical data, customs tariff codes or EAN barcodes.

Fastener styleNyloc insert lock nut
StandardDIN 985
MaterialA4 stainless steel (316)
Property classA4-70
Thread sizeM10
Thread pitch1.5 mm (coarse)
Head typeHexagon
Drive typeExternal hex (spanner)
Surface finishPlain (no plating)
HS commodity code7318163990
Recommended useMarine

RoHS and REACH compliant.

How do I choose between A2 and A4 stainless steel?

A2 (304) stainless steel suits most indoor, outdoor and workshop jobs. Choose A4 (316) marine grade for coastal, marine, poolside or other chloride-rich environments.

How do I make sure I order the right size?

Check the size in the product title and the standard, material and dimensions in the Product Specification tab. In M8 x 30, M8 is the thread diameter and 30 is the length in millimetres. See our size guide if you need more help.

When will my order arrive?

Orders placed before 4pm Monday-Friday are typically dispatched the same working day and every order is tracked. Next-day delivery is free over £50, or £5.50 below that threshold. Full options are shown at checkout.

What if I order the wrong item?

Email contact@simfix.com within 30 days of delivery with your order number. We will help arrange a refund or replacement. See our refunds information for the full process.

Is checkout secure?

Yes. Checkout is protected by SSL encryption and payments are processed through Shopify's secure checkout and supported payment providers. Simfix does not store your full card details.

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