Threaded fasteners constantly experience vibration, shock and temperature changes in dynamic industrial equipment, auto parts and electrical compartments. It is a common fact that threaded fasteners lose their initial clamping force over time.
In order to prevent joint failures due to self-loosening of fasteners and provide electrical continuity, mechanical engineers have relied on innovative locking tools made by Stainless Bolt Industries.
The Importance of Vibration-Resistant Hardware
During overloads loading on a bolted joint, microslips of nut or bolt occur. It means that a traditional flat washer is not able to prevent a nut or head from rotating under constant shear stress in absence of a secondary locking mechanism.
The use of advanced locking devices made of superior 316 stainless steel fasteners in India allows obtaining a mechanical spring grip that absorbs the shock of operation while keeping the constant preload of the joint.
1. Serrated Teeth Formulate Dual Mechanical Interlocking
Star washers, or serrated lock washers, are made up of serrated teeth arranged along their circumference. These hardened teeth, when pressed between the bolt head or nut and the mating surface, effectively grip both surfaces.
The result is dual mechanical interlocking, which results in friction. This special feature is resistant to counter-rotation caused by vibrations of machines, hence making it unnecessary to apply any adhesive chemical thread-lockers.
2. Internal Star Washers Guarantee Clean Surface Aesthetics
Star washers have their teeth designed along the inner diameter of the washer ring, which means that when pressure is applied on the teeth, they compress inward.
- Key Benefit: The outer edge remains smooth and flush. Hence, application of internal scarring will have no difficulties.
- Applications: It can be applied to screws with small diameter heads (e.g., cheese head or round head machine screws) where external clearance is limited.
3. External Star Washers Provide Maximum Torsional Holding Strength
External star washers come with twisted teeth located on the outer circumferential ring. With a wider distance to the axis of the bolt, such teeth give the washer a bigger torsional radius and a more effective resistance against the rotational torque.
- Main Advantage: Provides high locking ability and torsional strength on a larger bearing surface.
- Use: Mostly used in heavy industrial tools, automotive chassis structures, frame brackets, and heavy-duty electrical connectors.
4. Spring Tension Absorbs Thermal and Dynamic Shocks
Besides having the biting effect, the twisted-haired design works as an axial spring. When compressed, star washers accumulate elastic energy constant pressure toward the fastener bearing surface.
This permanent spring force absorbs heat expansion, material compression, and micro-settling. Thus, the bolt can handle tension in extreme heat load conditions.
5. Corrosion Resistance Ensures Electrical Joint Integrity
In electric grounding and outdoor electrical equipment, star washers perform two functions: biting through oxidation/corroded cover to create an electrical connection and keeping the contact tight.
Through it characterizes goods such as star washers and partner SS 304 PLAIN WASHER, manufactured out of pure A2(304) and A4(316) steels, Stainless Bolt Industries Pvt. Ltd. makes sure of the long-term conductivity and corrosion resistance of products used in corrosive mediums, which are coastal areas, chemicals and high humidity.
Key Factors to Consider When Selecting Star Washers:
- Required outer diameter clearance and aesthetic preferences
- Fastener head style (hex bolt, pan head, or machine screw)
- Expected dynamic vibration amplitude and shock load frequency
- Electrical conductivity and grounding requirements
- Material grade compatibility (A2 Grade 304 vs A4 Grade 316)
- Substrate surface hardness (washer teeth must be harder than mating surfaces)
- Verification of Material Test Certificates (MTC 3.1) for material purity
Extensive Product List and Adjacent Fastener Catalog
In order to provide irreproachable vibration preventive assemblies together with general plant engineering, Stainless Bolt Industries Pvt. Ltd. manufactures and stocks the full product line of industrial components of high accuracy. As a rule the applications for star washers include adjacent bolts, nuts and flat washers for the creation of approved and load-tested joints.
Our whole offer comprises the following products:
Locking & Plain Washers
Internal Star Washers (DIN 6798J), External Star Washers (DIN 6798A), Serrated Tooth Washers (DIN 6797), Plain Flat Washers (DIN 125/ISO 7089), Spring Washers (DIN 127B) and Wave, or Conical Washers (DIN 6796).
Bolts and Screws
DIN 933 Full Thread Hex Bolts, DIN 931 Half Thread Bolts, Socket Head Allen Cap Screws (DIN 912), Pan Head Machine Screws (DIN 7985), Countersunk Screws (DIN 965) and Hex Flange Bolts (DIN 6921).
Precision Components
Standard Hex Nuts (DIN 934), Nylon Insert Lock Nuts (DIN 982/985), Flange Lock Nuts (DIN 6923), Dome Cap Nuts (DIN 1587), and Wing Nuts (DIN 315).
Anchoring & Foundation Products
Heavy Concrete Wedge Expansion Anchors, Cast-In J-Bolts, Industrial U-Bolts (IS 730), and T-Slot Bolts.
Threaded Bar Stock & Custom Turned Parts
Full Length Threaded Rods (DIN 976), Double Studs, and Custom Fasteners produced under our registered Shree (Grade 202) and Sava (Grade 304/316) brands.
Why Choose Stainless Bolt Industries?
As a premier SS Manufacturer in India and leading SS Dealer in Ahmedabad, Stainless Bolt Industries Pvt. Ltd. manufactures a complete range of industrial washers, including plain washers, spring washers, internal star washers, and external star washers.
Our facility adheres strictly to international DIN 6797 and DIN 6798 standards, ensuring precise tooth geometry and consistent spring tension across every production batch. Every order is backed by full material traceability, competitive factory-direct pricing, and comprehensive MTC 3.1 certification.
Final thoughts
Preventing fastener self-loosening under severe vibration requires purpose-engineered locking hardware. Incorporating internal and external star washers into your mechanical designs provides dual-action tooth locking and spring tension to protect joint integrity.
Partner with Stainless Bolt Industries Pvt. Ltd. to access high-integrity stainless steel locking solutions built for high-vibration applications.
Frequently Asked Questions (FAQ)
A: Internal star washers have teeth on the inside diameter for a clean look on smaller screw heads. External star washers have teeth on the outer perimeter, offering greater torsional holding power for larger bolt heads.
A: It is recommended to replace star washers after disassembly. The biting action and spring tension flatten during initial installation, reducing their locking effectiveness upon re-use.
A: Yes, the teeth on stainless steel star washers penetrate surface coatings, paint, and light rust to establish a solid metal-to-metal contact for electrical bonding and grounding.