Which nut standard should I choose for general use?

ISO 4032 (DIN 934) hex nuts cover most general-purpose assemblies. Use ISO 4033 for taller nuts and ISO 4035 for thin/jam applications.

When do I need serrated flange or lock nuts?

Use serrated flange (ISO 4161/DIN 6923) or prevailing-torque lock nuts (DIN 985/982) in high-vibration applications to reduce loosening. Verify torque class to ISO 2320.

Which finish provides the best corrosion protection?

Hot-Dip Galvanised (HDG) or Aluminium-Zinc flake coatings offer strong outdoor protection. For marine/chemical environments, consider stainless A4-70/80.

Do you supply fine-pitch and UNC/UNF threads?

Yes. Metric coarse/fine pitches and UNC/UNF are available on selected ranges. Ask for matching bolts/rods and washers to ensure thread and strength compatibility.

Nuts

Industrial Nuts — ISO/DIN/IS Standards, Materials & Applications

Explore India’s wide range of industrial nuts for machinery, structural steel, automotive, electrical, marine and general engineering. We stock metric sizes (typically M3–M48) with coarse/fine pitches, popular finishes (zinc, black, HDG, Al-Zn flake, PTFE) and stainless grades (A2/A4). Pair with ISO 4014/4017 hex bolts, threaded rods (DIN 976) and flat/spring washers (ISO 7089/7090/7093/7092).

Common Standards

Hex Nuts: ISO 4032 (DIN 934), ISO 4033 (tall), ISO 4035 (thin/jam), IS 1364
Flange Nuts: ISO 4161 / DIN 6923 (serrated & plain)
Nyloc: DIN 985 / DIN 982 (prevailing-torque; ref. ISO 2320 testing)
Slotted/Castle: DIN 935
Wing: DIN 315
Square: DIN 557 (standard), DIN 562 (thin)
Tee (T-nuts): DIN 1624
Weld Nuts: DIN 928 (square), DIN 929 (hex), projection/spot weld types

Materials / Grades

Carbon & Alloy Steel: Property Class 5/8/10/12
Stainless: A2-70, A4-70/A4-80
Brass, Silicon Bronze, Aluminium Bronze
Special: Duplex/Super Duplex, Nickel Alloys (on RFQ)

Finishes / Coatings

Electro-zinc (clear/yellow/black), Black Oxide
Hot-Dip Galvanised (HDG)
Aluminium-Zinc Flake (Geomet/Dacromet)
Nickel / Zinc-Nickel, PTFE (low friction)

Browse Nuts by Type

Hex Nuts

General-purpose hexagon nuts to ISO 4032 / DIN 934; also ISO 4033 (taller) and ISO 4035 (jam). Offered in 8/10/12 property classes, stainless A2/A4, zinc/HDG/PTFE. Ideal for structural steel, machinery and OEMs.

Flange Nuts

Flange nuts spread load with an integrated washer face. Available serrated (anti-loosen) and plain per ISO 4161 / DIN 6923. Great for assemblies where washers are impractical.

Nyloc / Lock Nuts

Nylon-insert lock nuts (DIN 985/982) and prevailing-torque metal types reduce loosening from vibration. Choose fine pitch for precision fits; verify ISO 2320 torque class against your application.

Slotted / Castle Nuts

Designed for use with split pins/cotter pins through a drilled bolt. Common in automotive hubs, linkages and safety-critical joints.

Square Nuts

High-bearing area nuts for channels and old-work fixings. Standard (DIN 557) and thin (DIN 562) styles; often paired with square-neck bolts or carriage bolts.

Wing Nuts

Tool-free tightening for fixtures, jigs and temporary assemblies. Available in steel (zinc/black) and stainless for corrosion resistance.

Tee Nuts

T-nuts (DIN 1624) with prongs for timber, furniture and composites; provide a captive, flush thread from the rear face.

Weld Nuts

Projection and spot-weld nuts in hex/square plates for sheet-metal fabrication; common references DIN 928 (square) / DIN 929 (hex). Options with pilots, bosses and multiple projections for fast, consistent welds.

Cage Nuts

Spring-steel cage nuts for 19″ racks and sheet-metal panels. Typical sizes M5/M6; allow replacement without damaging the panel.

Coupling Nuts

Long coupling nuts for joining threaded rods (DIN 6334 style). Useful for adjustable tie-rod and suspension assemblies.

Push Nuts

One-way sheet-metal push-on retainers for shafts and studs—quick install with no threading required; used in appliances and trim.

Acorn / Cap Nuts

Dome-headed cap nuts for covered ends and improved appearance; protects threads and operators from snagging.

Allen / Socket Nuts

Hex-socket drive nuts for low-profile assemblies where an internal drive is preferred. Ideal when external hex clearance is limited.

Tamper-Resistant Nuts

Security shear nuts, tri-groove and other anti-theft patterns for street furniture, public fixtures and safety guards.

Applications

Construction & infrastructure (bridges, docks, highways), OEM machinery, electrical & solar, automotive & rail, oil & gas, HVAC & MEP, marine, and agriculture. Choose HDG/Al-Zn flake for outdoor corrosion, A4-70/80 for marine, and lock/serrated types for vibration.

Bulk & contract pricing, RFQ support and GST invoicing
Test certificates on request, property class verification and thread gauging
Fast dispatch via pan-India courier/transport; export packing available

Request a Quote / Bulk Pricing or WhatsApp: +91-9611591173

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BuyNutBolts — Trusted E-commerce Online Shopping Site for Industrial Fasteners & C-Parts

BuyNutBolts.com caters to both B2B and B2C industrial buyers across India. We specialise in fasteners and C-parts across ISO/DIN/IS standards with multiple grades and finishes: socket head screws, hex bolts, nuts, washers, anchors, rivets, spacers & standoffs, self-clinching fasteners, and more. We provide reliable procurement and supply solutions for MSMEs and enterprises in fabrication, machinery, electronics, automotive, and construction.

We focus on exclusive deals, transparent pricing, quick dispatch, and customer satisfaction. With streamlined logistics and partner carriers, our deliveries are fast and traceable pan-India.

Some of our Top-Selling B2B Categories

Socket Head Cap Screws — DIN 912 / ISO 4762, button head (ISO 7380), low head (ISO 12474), countersunk (ISO 10642).

Hex Bolts & Set Screws — 8.8 / 10.9 / 12.9 grades, full/half thread, zinc/black/HDG finishes.

Stainless Steel Fasteners — A2-70 / A4-70 / A4-80 in popular sizes & finishes.

Washers — flat, spring, fender, cup, and special profiles; DIN 125/127/9021.

Anchors & Rivets — wedge/sleeve/chemical anchors; blind & solid rivets.

Self-Clinching Fasteners — nuts, studs, standoffs for sheet metal.

Spacers & Standoffs — hex/round; brass/SS/AL; male-female variants.

C-Parts — dowel pins, circlips, split pins, spring pins, O-rings, grommets.

Wide Range of Products from Popular Brands & Labels

We stock leading brands for consistent quality and spec compliance. Explore: Unbrako, Sundram, LPS, Ambika, and more on our Brands page.

Exclusive Buyer-Friendly Features

GST Invoice: Proper HSN & GST on every order for ITC claims.

Tier Pricing: Optimised breaks at 100/500/1000+ quantities (see details).

Quick RFQ: Share BOM/part list for the best bulk quote within 24 hours — Request a Quote.

Secure Payments: UPI, Cards, NetBanking, and Bank Transfer (payment options).

Returns: 7-day window for eligible items (policy).

Coverage: Delivery to 20,000+ pincodes across India.

Why Industrial Buyers Choose BuyNutBolts

Deep catalog across standards (ISO/DIN/IS) and grades (8.8/10.9/12.9, A2/A4).

Material test certificates on request; brand authenticity and batch traceability.

Reliable shipping partners; trackable delivery and proactive support.

Clean, machine-readable product data for quick spec verification.

Dedicated help desk and WhatsApp support for order assistance.