Briggs & Stratton Nuts & Washers
Engine nuts and washers secure critical fasteners throughout Briggs & Stratton assemblies including flywheel retention, cylinder heads, and mounting hardware. Lawn mower engine nuts include hex nuts, lock nuts (nyloc), and specialty muffler lock nuts with varying torque specifications. Small engine washers feature flat washers for load distribution, Belleville washers (domed/cupped) for flywheel assemblies, and lock washers (split, star, internal tooth) preventing vibration loosening. Engine mounting washers must never contact aluminum surfaces directly when using split lock washers due to metal degradation. Briggs & Stratton nuts range from 1/4-inch through 5/8-inch sizes with corresponding socket requirements. We hold Briggs & Stratton engine washers and hardware in stock and sell worldwide.
Available Briggs & Stratton Nuts & Washers
Nut Retainer 31-18X0.
710288MA
Briggs & Stratton
£2.35
In Stock
Nut
690887
Briggs & Stratton
£9.60
In Stock
Nut
690662
Briggs & Stratton
£5.50
In Stock
Nut
710081
Briggs & Stratton
£3.90
In Stock
Palnut Washer
7026483
Briggs & Stratton
£2.60
In Stock
Nut Hex Flange Nylock 3/8-16
5025394SM
Briggs & Stratton
£2.60
In Stock
Toplock Spiral Nut
2860681SM
Briggs & Stratton
£2.70
In Stock
Hex Nut
703903
Briggs & Stratton
£2.15
In Stock
Nut 5/8-18 Hex Center Lock Jam
7090356YP
Briggs & Stratton
£3.15
Available
Washer Sealing
271716
Briggs & Stratton
£3.50
In Stock
Thrust Washer
7014523YP
Briggs & Stratton
£4.20
In Stock
Washer, Thrust, (Hex Flanged)
7011072YP
Briggs & Stratton
£4.80
In Stock
Frequently Asked Questions
Why shouldn't lock washers be used directly on aluminum surfaces?
Split lock washers "eat" into soft aluminum causing surface damage and torque loss as sharp edges dig into metal. Always place flat steel washer between lock washer and aluminum surface, ensuring steel-on-steel contact both sides. Lock washers work properly only against hard surfaces.
When should nyloc nuts be used instead of regular nuts?
Use nyloc (nylon-insert lock nuts) for vibration-prone applications like carburetor mounts, shroud bolts, and accessories. Nylon insert creates friction preventing loosening without lock washers. Reusable 2-3 times before nylon degrades—replace when nylon worn or melted from overtightening.
How does lubrication affect nut torque specifications?
Anti-seize or oil reduces friction requiring torque reduction to prevent over-tightening—multiply spec by 0.9 when using lubricants. Cadmium-plated fasteners also require 0.9 multiplier. Both plating and lubricant together multiply by 0.8. Torque specifications assume dry, non-plated fasteners unless stated otherwise.
What is the correct flywheel nut torque for Briggs & Stratton engines?
Most single-cylinder engines require 55-60 ft-lbs, while Intek V-twin and 31-series engines require 100 ft-lbs. Always torque to manufacturer specifications using calibrated torque wrench—insufficient torque causes key shearing, excessive torque cracks flywheels or strips threads.
What is a Belleville washer and how should it be installed?
Belleville washers are domed/cupped spring washers used under flywheel nuts maintaining clamping pressure. Install with cup side facing flywheel (dome facing nut). Missing or incorrectly installed Belleville washers cause repeated flywheel key shearing from inadequate clamping force.