High Collar Lock Washers - Secure & Reliable Protection

High collar lock washers also go by the name split washers for socket head cap screws. They lock and resist vibrations in assemblies. These split washers are smaller and thicker than standard split lock washers. You can use them with socket cap screws and other threaded fasteners in tight spaces.

What Sets High Collar Lock Washers Apart?

As their name suggests, they are made with a “high collar” - an extra-tall side profile. This helps the washer push hard between the fastener head and the surface it connects to in a locking function. The uneven helical split also has sharp ends that can dig into the fastener and substrate for an extra biting grip.

So how do these design factors translate to function? When you tighten the fastener, the high collar split lock washer flattens and the curled ends press firmly against the hardware and joint material. This creates substantial friction and resistance to rotation, preventing loosening from vibration or shock impacts.

The locking effectiveness does decrease somewhat as torque increases beyond the optimum range. However the high collar maintain tighter assemblies than lower profile split washers.

Overall, high collar split lock washers are a reliable and effective solution for preventing fasteners from loosening in high vibration or shock environments. Their unique design features, such as the uneven helical split and sharp ends, provide a strong biting grip that helps maintain a tight assembly. While their locking effectiveness may decrease at higher torque levels, they still outperform lower profile split lock washers in keeping fasteners secure. In conclusion, these split washers are a valuable tool for ensuring the stability and longevity of mechanical connections.

Why Use A High Collar Split Lock Washer?

Vibration is the enemy of threaded fasteners. Constant cyclic movement inevitably leads to loosening as torque decreases over time. For critical connections that cannot tolerate unexpected disassembly, washers that apply friction against rotation provide cheap locking insurance. High collar washers excel in these situations with their height adding more spring force and bite than standard split lock types.

High collar split washers reduce vibration. They are helpful in situations where using double nuts or jam solutions is difficult. This is because the hardware directly opposes each other. High collar lock washers can resist loosening as single standalone components, making them a preferred choice for securing hardware.

  • Securing valve covers and pumps in engine bays
  • Locking screw joints on heavy vibrating machinery
  • Critical alignments along drive shafts and pulley systems
  • Use high collar lock washers to secure sensitive measuring devices that cannot tolerate any loosening.

High Collar Lock Washer Specifications

High collar lock washers are available in inch and metric sizes to accommodate a wide range of threaded fasteners. Common materials include stainless steel, zinc plated steel, and black oxide finished steel.

Stainless steel high collar split washers provide the best all-around performance with excellent corrosion and chemical resistance. The 300 series alloys also maintain high strength and are only mildly magnetic.

Zinc and black oxide plated steel washers offer a economical alternative. While not impervious to corrosion, the sacrificial platings significantly increase wet environment longevity over bare steel. This makes them suitable for many general industrial and commercial installations.

All high collar lock washers should meet minimum dimensional standards per ASME B18.21.1. This helps ensure proper fit and optimal spring function from part to part. High strength steel variants will also adhere to mechanical requirements from ASTM.

Inch vs Metric High Collar Lock Washers

We have lock washers in both inch and metric sizes for American and imported threaded fasteners in our inventory. This includes varieties to fit under the heads of socket head cap screws. Be careful when using washers - mixing inch and metric sizes can weaken the locking ability of the hardware. One important mention is to keep them separate to maintain their effectiveness.

Metric high collar lock washers adhere to DIN 127 or DIN 7980 specifications. ISO fit class standards categorize dimensional tolerances by A and B limits.

Inch sized high collar split washers meet ASME 18.21.1 and NASM 35338 standards. The latter replaced the original military MS 35338 and AN935 designations. Commercial grade washers have wider size tolerances while aerospace varieties hold tighter limits for precision fit.

Material Choices

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  • Stainless Steel - Best corrosion resistance and often non-magnetic. The 300 series is popular, but PH grades offer secondary operations.
  • Zinc Plated Steel - Low-cost steel with yellow zinc coating to resist red rust. This material is better used in dryer environments only.
  • Black Oxide Steel - Oiled black finish increases corrosion protection over bare steel. This material is good for indoor applications.
  • Galvanized Steel - Hot dipped zinc alloy layer prevents white rust. Handles more humidity than yellow zinc.
  • Phosphate Coated - Thin phosphate layer adds minor corrosion protection. Used more for preparation before oil coating.

Installation Best Practices

To achieve maximum vibration resistance, proper high collar lock washer installation is critical. Here are some key tips:

  • Use flat smooth mating surfaces when possible to increase friction surface area
  • Ensure the high collar split lock washer is concentric under the fastener head
  • Tighten the fastener adequately to flatten the helical split ring but do not completely compress the collar
  • Allow optimum torque range to let the teeth bite without excessive clamp deformation
  • Only use one high collar lock washer per fastener as too many will stack up small differences in size and shape that reduce performance

Do not use high collar lock washers with self-locking threaded hardware like nylon insert nuts or all-metal locknuts. The integrated friction resistance and washers together can actually increase the chance of joint failure.

Reusing High Collar Lock Washers

You can take joints apart and re-use the washers. But the washers lose some ability to prevent vibration loosening after first use. The metals get work-hardened and fatigued, changing the washers' springiness.

For important joints exposed to vibration, use new high collar lock washers. For critical installations, recommend replacing high collar lock washers when possible rather than reusing existing washers. If reusing washers, be sure to verify maintained torque values.

Ordering High Quality High Collar Lock Washers

Our catalog has many inch and metric high collar lock washers for different uses. We sell small amounts for end users or large volumes for product makers. This allows us to offer great prices. Contact us for inquiries on:

  • Material grade requirements
  • Applicable performance standards
  • Price breaks at volume
  • Custom production sourcing

Get your next vibration resistant fastener order rolling today! Our team has decades of experience assisting customers in selecting the optimal high collar lock washers for their assemblies.

High Collar Lock Washer FAQ

What are high collar lock washers used for?

High collar lock washers are used to secure threaded fasteners in assemblies by providing friction against rotation, preventing loosening from vibration or shock impacts.

How do high collar lock washers differ from standard split lock washers?

High collar lock washers have a taller side profile, which allows them to exert more spring force and bite than standard split lock washers, making them more effective in resisting loosening.

Can high collar lock washers be reused?

High collar lock washers can be taken apart and reused, but their ability to prevent vibration loosening decreases after the first use due to work-hardening and fatigue of the metal.

What materials are high collar lock washers available in?

High collar lock washers are commonly available in stainless steel, zinc plated steel, and black oxide finished steel, each offering different levels of corrosion resistance and suitability for various environments.

How should high collar lock washers be installed for maximum effectiveness?

To achieve maximum vibration resistance, it is important to ensure that the high collar split lock washer is concentric under the fastener head, tighten the fastener adequately without completely compressing the collar, and use only one washer per fastener to avoid stacking up differences in size and shape.

Can high collar lock washers be used with self-locking threaded hardware?

It is not recommended to use high collar lock washers with self-locking threaded hardware like nylon insert nuts or all-metal locknuts, as this combination can increase the chance of joint failure.