Q: How does the Disc-Lock Washer work?

A: The Disc-Lock principle consists of two washer shaped pieces that have inclined cams on one side and a series of ridges on the other. The greater the rise angle of the Disc-Lock cams along with the non-slip ridges work together to prevent loosening caused by shock and vibration. The result is a fastening system that is vibration proof according to Military Standards*.

*United States Military MIL-STD 1312, Test 7, Vibration Test Results data available upon request to info@disc-lock.com.au.

Q: What are the chances of a fastener loosening if Disc-Lock Washers are fitted?

A: None. When applied and installed properly the Disc-Lock Washers will ensure the fastener remains secure. 

Q: Can Disc-Lock Washers be used under the head of cap screws in blind hole application?

A: Yes.

Q: Can Disc-Lock Washers be re-used?

A: No.

Q: DoeS a fastener fitted with a Disc-Lock Washer require a different torque setting from conventional washers?

A: No. Just use the recommended handbook torque.

Q: In what sizes is the Disc-Lock Washer available?

A: Fifteen sizes ranging from 5mm to 38mm in metric and from 3/16 to 1-1/2" in imperial.

Q: Does the Disc-Lock Washer have a special coating?

Coated with Delta Protekt (Color - silver matte) Minimum 600 hours of salt spray. 

Q: What material is used in the manufacture of Disc-Lock Washers?

A: Standard Disc-Lock Washers are made from 1010 Carbon Steel. Disc-Lock also stocks washers manufactured in 316 stainless steel - from 5mm to 16mm or 3/16 to 5/8" inclusive.  

Q: Are Disc-Lock Washers susceptible to hydrogen embrittlement?

A: No, as they are baked after coating.

Q: Is the Disc-Lock Washer corrosion resistant?

A: The standard Delta Protekt coated Disc-Lock Washers can withstand 600 hours of salt spray. The Stainless Steel Washers are corrosion resistant. 

Q: Is the Disc-Lock Washer heat-treated?

A:  Yes, they are case hardened to between 40 to 50 on the Rockwell C scale, in a rotary furnace, in a carbon nitrite environment.

Q: What is the maximum temperature in which Disc-Lock Washers can be used?

A: Standard Disc-Lock Washers (made from 1010 carbon steel and case hardened) can be used for applications in environments up to a maximum temperature of 148 degrees Celsius. 

Stainless Steel Disc-Lock Washers can be used for applications in environments up to a maximum temperature of 621 degrees Celsius.  

Q: Is the heat treat hardness of Disc-Lock Washers checked?

A: Yes, by micro hardness testing at independent testing laboratories.

Q: Will the Disc-Lock Washer save maintenance time?

A: Yes, nuts and bolts fitted with Disc-Lock Washers do not require re-tightening.

Q: In which type applications have Disc-Lock Washers performed successfully?

A: Disc-Lock Washers have out-performed all other types of loose, washered, threaded or pinned in a wide range high-stress, corrosive and vibration sensitive applications including heavy equipment, bus and truck fleets, oil drilling rigs, public utilities, railroads, logging and mining equipment, pipelines, military and many more.

Q: Are Disc-Lock washers suitable for left-hand threads?

A: No. Disc-Lock washers are only suitable for right-hand threads

Q: How is the Disc-Lock Washer fitted?

A: Simply mate the cams together and place between the nut and the joint material.

Q: Do you need a torque wrench when fitting Disc-Lock Washers?

A: No.

Q: Can an air-gun be used when fitting Disc-Lock Washers?

A: Yes.

Q: Is the Disc-Lock Washer patented world-wide?

A: Yes.