General Wheel Weight Hardware Specifications

Important: General Advisory Information Only

Hardware supplied or recommended is intended for the application identified with that hardware. Torque values are advisory only because torque is an indirect indication of tension and no two bolts are exactly the same at a given torque.

Real-world differences can affect preload. The listed values are general estimated torque values and should not override product-specific instructions, equipment manufacturer guidance, or a documented torque specification for the actual installation.

Incorrect installation, improper use, or over-tightening or under-tightening of fasteners can cause personal injury or equipment failure. Stop using the product and contact TractorWeights.com if you have concerns about maintaining clamp force, bolt breakage, or deformation.

Inspection and Installation Guidance

Check the torque and condition of fasteners regularly. The original reference recommends checking after approximately 3 to 5 hours of use following installation and then regularly thereafter, at least monthly.
Use only the applicable hardware configuration and coating condition shown for the installation. Torque values are not interchangeable across bolt sizes, grades, coatings, lubricants, or mounting systems.
Do not treat this page as permission to substitute hardware, change fastener grade, add washers, or alter a product-specific stack-up.

Thread-locker note: The original reference states that, when liquid thread locker is used despite it not being recommended, Zinc Plated - Dry values may be used as a starting point. Contact TractorWeights.com with questions because actual conditions can require different performance.

Understand Torque, Preload & Clamp Force

These tables are quick general references. For a detailed explanation of why torque can vary with hardware condition, coatings, lubrication, preload, washers, and routine inspection, read the full guide.

Read the Clamp Force & Wheel-Weight Torque Guide →

SAE Coarse-Thread Hardware

Torque values in foot-pounds (ft-lb)
Size	Thread	Coating / condition	Grade 5 J429 Torque ft-lb	Grade 8 J429 Torque ft-lb	A574 Cap Screw Torque ft-lb
5/8 in.	Coarse	Lubricated	113	159	179
		Zinc plated - dry	128	180	215
		Plain - dry	150	212	238
3/4 in.	Coarse	Lubricated	200	282	317
		Zinc plated - dry	230	320	381
		Plain - dry	267	376	423

Torque values in foot-pounds (ft-lb). Select the exact hardware grade and condition; do not mix values across configurations.

5/8 in. coarse thread

Lubricated

Grade 5: 113 ft-lb
Grade 8: 159 ft-lb
A574 cap screw: 179 ft-lb

Zinc plated - dry

Grade 5: 128 ft-lb
Grade 8: 180 ft-lb
A574 cap screw: 215 ft-lb

Plain - dry

Grade 5: 150 ft-lb
Grade 8: 212 ft-lb
A574 cap screw: 238 ft-lb

3/4 in. coarse thread

Lubricated

Grade 5: 200 ft-lb
Grade 8: 282 ft-lb
A574 cap screw: 317 ft-lb

Zinc plated - dry

Grade 5: 230 ft-lb
Grade 8: 320 ft-lb
A574 cap screw: 381 ft-lb

Plain - dry

Grade 5: 267 ft-lb
Grade 8: 376 ft-lb
A574 cap screw: 423 ft-lb

These entries cover the coarse-thread hardware and coating conditions shown in the source reference. Use product-specific instructions whenever they are available.

Metric Coarse-Thread Hardware

Torque values in foot-pounds (ft-lb)
Size	Thread	Coating / condition	Class 8.8 Torque ft-lb	Class 10.9 Torque ft-lb
16 mm	Coarse	Lubricated	121	173
		Zinc plated - dry	137	196
		Plain - dry	161	230
20 mm	Coarse	Lubricated	236	337
		Zinc plated - dry	267	382
		Plain - dry	314	449

Torque values in foot-pounds (ft-lb).

16 mm coarse thread

Lubricated

Class 8.8: 121 ft-lb
Class 10.9: 173 ft-lb

Zinc plated - dry

Class 8.8: 137 ft-lb
Class 10.9: 196 ft-lb

Plain - dry

Class 8.8: 161 ft-lb
Class 10.9: 230 ft-lb

20 mm coarse thread

Lubricated

Class 8.8: 236 ft-lb
Class 10.9: 337 ft-lb

Zinc plated - dry

Class 8.8: 267 ft-lb
Class 10.9: 382 ft-lb

Plain - dry

Class 8.8: 314 ft-lb
Class 10.9: 449 ft-lb

All-Metal Prevailing-Torque Nuts

These ranges apply to electro-zinc-plated or lubricated all-metal prevailing-torque nuts where that configuration is optional and applicable.

Minimum-to-maximum torque ranges in foot-pounds (ft-lb)
Size	Grade 5 equivalent Torque min-max	Grade 8 equivalent Torque min-max
5/8 in.	113 - 143	159 - 201
3/4 in.	200 - 253	282 - 357

Minimum-to-maximum torque ranges in foot-pounds (ft-lb).

5/8 in. prevailing-torque nut

Grade 5 equivalent113 - 143 ft-lb

Grade 8 equivalent159 - 201 ft-lb

3/4 in. prevailing-torque nut

Grade 5 equivalent200 - 253 ft-lb

Grade 8 equivalent282 - 357 ft-lb