Vimal Industrial Corporation is a trusted stockist and supplier of DIN 439 B hexagon thin nuts—commonly known as jam nuts or lock nuts—based in Mumbai, India. Engineered to the DIN 439 B standard, these low‑profile nuts provide a space‑saving locking solution for bolted joints that demand dependable preload without adding excess height or weight. Manufactured in high‑tensile carbon steel and corrosion‑resistant stainless steel, each nut delivers consistent thread engagement, precise across‑flats accuracy, and reliable performance under dynamic loads.
DIN 439 B specifies thin hexagon nuts with chamfered edges and standard metric threads. Unlike full‑height DIN 934 nuts, DIN 439 B thin nuts are roughly half the thickness—designed to:
Available in property classes for general‑purpose and high‑tensile applications—as well as stainless grades for chemical, food‑grade, or outdoor use—DIN 439 B nuts are finished in plain/oiled, zinc‑plated, hot‑dip galvanised, black oxide, and PTFE‑coated options to suit varying environmental and torque‑tension requirements.
With India’s automotive, machinery, and infrastructure sectors increasingly incorporating vibration‑resistant fastening systems, DIN 439 B thin nuts are an essential stock item for OEMs, MRO stores, and EPC contractors. Vimal Industrial Corporation partners with leading mills—most notably APL Fasteners—to keep DIN 439 B nuts ready in stock in multiple protective finishes and strength classes. Our Mumbai warehouse and well‑established logistics network enable same‑day dispatch nationwide, complete with mill test certificates, lot traceability, and third‑party inspection support when required.
DIN 439 B jam nuts are optimized for assemblies where low profile, anti‑vibration locking, or weight savings are critical.
Common Applications Include:
Mechanical & Automotive Equipment
Used as lock nuts on shafts, spindles, and steering components to maintain preload under road shock or machine vibration.
Hydraulic & Pneumatic Fittings
Secure gland nuts, hose connections, and valve stems where space constraints demand a thin locking element.
Heavy Machinery & Construction Plant
Prevent bolt back‑off on vibrating crushers, screen frames, and compact earth‑moving attachments.
Electrical & Instrumentation Panels
Clamp terminal lugs, stud connections, and mounting brackets without protruding into restricted cabinet depths.
General Engineering & Fabrication
Ideal for any bolted joint needing a secondary locking nut to resist loosening while keeping overall stack height to a minimum.
As a trusted name in the industrial fasteners sector, Vimal Industrial Corporation is known for its reliable sourcing, prompt delivery, and deep technical understanding. We specialize in supplying DIN 439 B Thin Nuts that meet global performance standards, catering to a wide range of industries including infrastructure, automotive, power, and heavy engineering.
Why clients across India choose us:
✅ Authorized APL Fasteners Dealer – Guaranteed genuine DIN 439 B nuts with full mill documentation
✅ Extensive On‑Hand Inventory – Multiple property classes, stainless options, and protective finishes ready to ship
✅ Project‑Friendly Fulfilment – Custom‑packed kits, bar‑coded bags, palletised loads, and JIT site deliveries
✅ Technical Know‑How – Torque‑locking guidance, finish selection, and compatibility advice for double‑nut assemblies
✅ Pan‑India Delivery – Strategically located Mumbai hub enables rapid dispatch to metros, industrial clusters, and remote sites
✅ Stringent Quality Assurance – Products inspected to DIN 439 B dimensional limits and ISO mechanical standards, with third‑party inspection available
✅ Customer‑Centric Service – Fast quotations, dedicated account managers, and seamless export paperwork for overseas buyers
Whether you’re an OEM, contractor, or industrial buyer, we simplify your fastener procurement with timely service, accurate documentation, and unbeatable reliability.
| Thread size d | M1,6 | (M1,8) | M2 | M2,5 | M3 | (M3,5) | M4 | M5 | M6 |
|---|---|---|---|---|---|---|---|---|---|
| P | 0,35 | 0,35 | 0,4 | 0,45 | 0,45 | 0,6 | 0,7 | 0,8 | 1 |
| da min. | 1,6 | 1,8 | 2 | 2,5 | 3 | 3,5 | 4 | 5 | 6 |
| da max. | 1,84 | 2,06 | 2,3 | 2,9 | 3,45 | 4 | 4,6 | 5,75 | 6,75 |
| dw min. | 2,4 | 2,7 | 3,1 | 4,1 | 4,6 | 5,1 | 5,9 | 6,9 | 8,9 |
| e min. | 3,48 | 3,82 | 4,32 | 5,45 | 6,01 | 6,58 | 7,66 | 9,79 | 11,05 |
| m max. | 1 | 1,1 | 1,2 | 1,6 | 1,8 | 2 | 2,2 | 2,7 | 3,2 |
| m min. | 0,75 | 0,85 | 0,95 | 1,35 | 1,55 | 1,75 | 1,95 | 2,45 | 2,9 |
| m´ min. | 0,6 | 0,68 | 0,76 | 1,06 | 1,24 | 1,4 | 1,56 | 1,96 | 2,32 |
| s max. | 3,2 | 3,5 | 4 | 5 | 5,5 | 6 | 7 | 8 | 10 |
| s min. | 3,08 | 3,38 | 3,82 | 4,82 | 5,32 | 5,82 | 6,78 | 7,78 | 9,78 |
| Thread size d | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 |
|---|---|---|---|---|---|---|---|---|---|
| M8×1 | M10×1 | M12×1,25 | (M14×1,5) | M16×1,5 | (M18×1,5) | M20×2 | (M22×1,5) | M24×2 | |
| – | M10×1,25 | M12×1,25 | – | – | (M18×2) | M20×1,5 | (M22×2) | (M24×1,5) | |
| P | 1,25 | 1,5 | 1,75 | 2 | 2 | 2,5 | 2,5 | 2,5 | 3 |
| da min. | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| da max. | 8,75 | 10,8 | 13 | 15,1 | 17,3 | 19,5 | 21,6 | 23,8 | 25,9 |
| dw min. | 11,6 | 15,6 | 17,4 | 20,5 | 22,5 | 24,9 | 27,7 | 29,5 | 33,2 |
| e min. | 14,38 | 18,9 | 21,1 | 24,49 | 26,75 | 29,56 | 32,95 | 35,03 | 39,55 |
| m max. | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| m min. | 3,7 | 4,7 | 5,7 | 6,42 | 7,42 | 8,42 | 9,1 | 9,9 | 10,9 |
| m´ min. | 2,96 | 3,76 | 4,56 | 5,14 | 5,94 | 6,74 | 7,28 | 7,92 | 8,72 |
| s max. | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 |
| s min. | 12,73 | 16,73 | 18,67 | 21,67 | 23,67 | 26,16 | 29,16 | 31 | 35 |
| Thread size d | (M27) | M30 | (M33) | M36 | (M39) | M42 | (M45) | M48 | (M52) |
|---|---|---|---|---|---|---|---|---|---|
| (M27×2) | M30×2 | (M33×2) | M36×3 | (M39×3) | M42×3 | (M45×3) | M48×3 | (M52×3) | |
| – | – | – | M36×2 | (M39×2) | M42×2 | (M45×2) | M48×2 | (M52×2) | |
| (M27×1,5) | M30×1,5 | – | M36×1,5 | (M39×1,5) | M42×1,5 | (M45×1,5) | M48×1,5 | (M52×1,5) | |
| P | 3 | 3,5 | 3,5 | 4 | 4 | 4,5 | 4,5 | 5 | 5 |
| da min. | 27 | 30 | 33 | 36 | 39 | 42 | 45 | 48 | 52 |
| da max. | 29,2 | 32,4 | 35,6 | 38,9 | 42,1 | 45,4 | 48,6 | 51,8 | 56,2 |
| dw min. | 38 | 42,7 | 46,6 | 51,1 | 55,9 | 60 | 64,7 | 69,4 | 74,2 |
| e min. | 45,2 | 50,85 | 55,37 | 60,79 | 66,44 | 71,3 | 76,95 | 82,6 | 88,25 |
| m max. | 13,5 | 15 | 16,5 | 18 | 19,5 | 21 | 22,5 | 24 | 26 |
| m min. | 12,4 | 13,9 | 15,4 | 16,9 | 18,2 | 19,7 | 21,2 | 22,7 | 24,7 |
| m´ min. | 9,9 | 11,1 | 12,3 | 13,5 | 14,6 | 15,8 | 17 | 18,2 | 19,8 |
| s max. | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
| s min. | 40 | 45 | 49 | 53,8 | 58,8 | 63,1 | 68,1 | 73,1 | 78,1 |
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A DIN 439 B thin nut—often called a jam nut or lock nut—is roughly half the thickness of a full‑height DIN 934 hex nut. The reduced profile lets you save space and weight or create a vibration‑resistant double‑nut lock when it’s tightened against a primary nut. Both share the same metric thread pitches, so a DIN 439 B nut can be paired directly with any bolt or stud of the same diameter and pitch.
Choose DIN 439 B nuts when you need a mechanical, reusable lock without nylon inserts or distorted threads—ideal for high‑temperature zones, aggressive chemicals, or applications that require frequent disassembly. Typical examples include adjustment screws, hydraulic fittings, shaft collars, and machinery subject to moderate vibration where you can snug a thin nut against a full‑height nut to prevent back‑off.
We supply DIN 439 B thin nuts in carbon‑steel property classes (4, 5, 8, 10) and stainless grades A2‑70 and A4‑70 for corrosion resistance. Finishes include bright zinc plating, hot‑dip galvanising, black oxide, phosphate, and PTFE. All items are sourced from certified manufacturers—most notably APL Fasteners—and delivered with mill test certificates for seamless QA/QC compliance.
Yes. While the dimensional tolerances are governed by DIN 439, the mechanical strength classes follow ISO 898‑2 for steel nuts and ISO 3506‑2 for stainless‑steel grades (e.g., A2‑70, A4‑80). Our inventory is batch‑tested to verify hardness, tensile strength, and proof load, ensuring every shipment conforms to global standards as well as customer‑specific third‑party inspection criteria.
Thanks to our large on‑hand stock in Mumbai, most DIN 439 B jam‑nut orders ship the same day. We offer express courier for maintenance spares, LTL trucking for bulk pallets, and export packing for overseas buyers. Whether you need M6 zinc‑plated jam nuts for an automotive line or M48 stainless thin nuts for a petro‑chemical plant, Vimal Industrial Corporation ensures fast, trackable delivery across India.
