Thin / Jam Nut
Thin Nuts, also known as Jam Nuts, are low-profile hexagonal nuts used as a locking device when paired with a standard nut. Their reduced thickness makes them suitable for applications where space is limited or where an additional lock nut is required to prevent loosening under vibration.
| Parameter | Specification |
|---|---|
Product Type |
Thin Nut / Jam Nut |
Size Range |
M2 – M48 (custom sizes available) |
Material Options |
Stainless Steel, Carbon Steel, Alloy Steel, Brass |
Standards |
DIN 439, ISO 4035, BS, ASTM |
Surface Finish |
Zinc Plated, Nickel Plated, Black Oxide, Hot-dip Galvanized |
Industrial Applications
Thin / Jam Nuts are widely used in:
- Electrical panels and assemblies: Useful in compact spaces where standard nuts cannot fit.
- Automotive industry: Act as lock nuts for securing fasteners against vibration in engines and machinery.
- Construction and steel structures: Provide secondary locking in structural joints and bolted frameworks.
- Machinery and equipment: Enhance resistance against loosening in rotating or vibration-prone environments.
- Furniture and consumer products: Offer slim fastening solutions without increasing bulk.
Product Description
Thin or Jam Nuts are designed with approximately half the thickness of a standard hex nut. Their primary function is to act as a locking nut by being tightened against a standard nut to lock the pair in place. This double-nut method prevents self-loosening caused by vibration or movement. Apart from locking applications, thin nuts are also used in assembly conditions with limited space, where a full-size nut cannot be accommodated. Available in various finishes and materials, jam nuts are highly versatile for both heavy-duty and light applications.
Product specifications
- Nut Type: Low-profile hexagonal nut (half height of standard hex nut)
- Size Range: Metric M2 – M48; inch sizes available upon request
- Thread Type: ISO metric coarse/fine, UNC/UNF, BSW, BSF; custom threading on request
- Material Options: Stainless steel (A2, A4), mild steel, carbon steel, alloy steel, brass
- Surface Finish: Zinc plated, nickel plated, galvanized, black oxide, chrome plated, plain finish
- Strength Class: Available in property classes 4, 6, 8, 10; ASTM Grade A and Grade 2 available
- Tensile Strength: Up to 800–1,000 MPa depending on material and class
- Hardness: Rockwell C19–C38 for alloy steel grades
- Operating Temperature: -50°C to +400°C depending on finish and base material
- Corrosion Resistance: High when made from stainless steel or with protective coatings
- Applications: Used in lock nut combinations, limited-space installations, and vibration-prone connections
- Standards/Compliance: DIN 439, ISO 4035, BS 3692 (thin series), ASTM A563
- RoHS/REACH Compliance: Available for stainless steel and coated variants
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