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 is essentially a low-profile hex nut used when vertical space is limited. It is often used as a “Jam Nut,” where it is tightened against a standard nut to lock the bolt fastener in place and prevent it from loosening due to vibration.
They are called Jam Nuts because they “jam” against another nut to create friction. In many industrial setups in India, engineers use this double-nutting technique to ensure the assembly stays secure without using chemical thread-lockers.
You can find them in carbon steel, galvanized steel, and Stainless Steel Fasteners (A2/A4). For projects in Mumbai, SS 316 is the preferred choice to ensure the thin profile doesn’t weaken over time due to salt-water corrosion.
Yes, the “B” version (DIN 439 B) has chamfered edges (rounded corners) on both sides, making it easier to install and more aesthetic. This is the standard version of most Nut Bolt Supplier stocks in Mumbai for general engineering use.
Precision is key with thin nuts. If the threads aren’t cut perfectly, the nut can strip easily under pressure. A trusted Fasteners Supplier India like Vimal Industrial ensures that even the thinnest nuts meet international DIN standards for thread accuracy.
