Husqvarna 532170165 5/16-18 Shoulder Bolt – Genuine OEM Replacement Equipment Fastener
Part Number: 532170165
Category: Lawn Tractor, Riding Mower & Outdoor Power Equipment Hardware
Type: 5/16-18 Shoulder Bolt – Genuine OEM Replacement Equipment Fastener
The Husqvarna 532170165 Shoulder Bolt is a genuine OEM replacement fastener designed for select Husqvarna lawn tractors, riding mowers, mower decks, and compatible outdoor power equipment assemblies. The OEM description identifies this component as a 5/16-18 shoulder bolt, meaning it combines a threaded fastening section with an unthreaded shoulder used to help position, support, or pivot the adjoining component.
Product Specifications
- Part Number: 532170165
- Manufacturer: Husqvarna
- Product Type: Shoulder Bolt
- OEM Description: Bolt, Shoulder 5/16-18
- Alternate Description: Shoulder Screw / Pivot Bolt / Equipment Fastener
- Thread Size: 5/16-18
- Threads Per Inch: 18 TPI
- Thread Series: UNC / Coarse Thread
- Fastener Style: Shoulder Bolt
- Component Type: Mounting / Pivot / Retaining Hardware
- Primary Application: Lawn Tractor / Riding Mower / Outdoor Power Equipment
- System: Model and Assembly Dependent
- Function: Secures Components While Providing a Defined Shoulder for Positioning or Pivoting
- Compatible Brand: Husqvarna
- Installation Location: Model Dependent
- Replacement Type: Direct OEM Replacement
- OEM Status: Genuine Husqvarna OEM Part
- Condition: New
- Quantity: 1 Shoulder Bolt
- Part Number Reference: 532170165
- Alternate Number Format: 532 17 01-65
Features & Benefits
- Genuine Husqvarna OEM replacement hardware
- Factory-specified 5/16-18 shoulder bolt
- Provides a defined unthreaded shoulder
- Helps maintain proper component spacing
- Can serve as a pivot surface in compatible assemblies
- Helps prevent direct thread contact with moving components
- Designed around the original equipment geometry
- Application-specific shoulder length and diameter
- Suitable for replacing bent, stripped, worn, or missing bolts
- Direct replacement for equipment specifying 532170165
- Maintains the original fastener configuration
- Sold individually
Shoulder Bolt Function
A shoulder bolt differs from a conventional fully threaded bolt.
Its construction includes:
Bolt Head → Unthreaded Shoulder → Threaded Section
The shoulder provides a smooth, controlled-diameter surface that can support or locate a component.
Depending on the application, the 532170165 may help provide:
- Pivot support
- Component alignment
- Controlled spacing
- Reduced thread wear
- Retention of moving parts
- Proper mechanical clearance
The exact function depends on the assembly in which the bolt is installed.
5/16-18 Thread Specification
The 532170165 uses a 5/16-18 thread.
This means:
- 5/16 Inch: Nominal thread diameter
- 18: Threads per inch
The mating nut or threaded component must use the same 5/16-18 UNC thread specification.
Do not substitute a 5/16-inch bolt with a different thread pitch.
Shoulder Section
The unthreaded shoulder is one of the most important features of this fastener.
Compared with the threaded portion, the shoulder provides:
- A smoother bearing surface
- More consistent diameter
- Improved support for pivoting components
- Better component positioning
- Reduced wear where motion occurs
If the shoulder becomes deeply grooved or worn, the connected component may develop excessive play.
Shoulder Bolt vs. Standard Hex Bolt
The 532170165 should not automatically be replaced with a standard fully threaded bolt.
Shoulder Bolt
Provides a smooth, defined shoulder for support, spacing, or pivoting.
Standard Bolt
May have threads extending through the area where a component pivots or bears against the fastener.
Using the wrong style can potentially cause:
- Excessive wear
- Binding
- Incorrect spacing
- Loose movement
- Damage to the adjoining component
For equipment calling for 532170165, retain the correct shoulder-bolt design.
Pivot Applications
Shoulder bolts are commonly used where a mower component must move around the fastener.
Potential applications can include:
- Idler arms
- Deck linkage
- Brake linkage
- Steering components
- Lever assemblies
- Suspension components
The exact use of 532170165 depends on the specific equipment model and parts diagram.
Common Reasons for Replacement
Replacement of the 532170165 Shoulder Bolt may be appropriate if the original fastener has:
- Bent
- Developed damaged threads
- Become cross-threaded
- Developed a rounded head
- Become heavily corroded
- Developed shoulder wear
- Developed grooves
- Sustained impact damage
- Become stretched
- Been overtightened
- Been damaged during removal
- Been lost during service
A shoulder bolt with significant wear on its bearing surface should generally be replaced rather than reused.
Possible Signs of Shoulder Bolt Wear
Depending on the application, a worn shoulder bolt may contribute to:
- Excessive pivot play
- Loose linkage
- Rattling
- Component misalignment
- Uneven movement
- Binding
- Abnormal wear
- Excessive vibration
- Difficulty maintaining proper adjustment
These symptoms can also originate from worn bushings, brackets, arms, or mounting holes.
Shoulder Inspection
Inspect the original bolt shoulder for:
- Grooving
- Flat spots
- Corrosion
- Pitting
- Excessive wear
- Bending
- Surface damage
The shoulder should remain smooth enough to provide the intended support or pivot surface.
Thread Inspection
Inspect the threaded portion for:
- Cross-threading
- Flattened threads
- Corrosion
- Burrs
- Missing threads
- Stretching
- Damage from overtightening
The bolt should thread smoothly into the mating nut or threaded component without excessive force.
Mounting Hole Inspection
Whenever replacing 532170165, inspect the component that rides on or mounts around the shoulder.
Check for:
- Elongated holes
- Worn bushings
- Cracks
- Distortion
- Excessive play
- Corrosion
A new shoulder bolt cannot correct an excessively worn mounting hole.
Nut & Retainer Inspection
If the application uses a separate nut or retaining component, inspect it for:
- Damaged threads
- Loss of locking ability
- Corrosion
- Distortion
- Excessive wear
Use the correct replacement retaining hardware where required.
Installation Considerations
Before replacing 532170165:
- Park the equipment on a flat, stable surface.
- Shut off the engine.
- Remove the ignition key where applicable.
- Allow all moving components to stop.
- Disconnect the spark plug or battery where appropriate.
- Locate the shoulder bolt using the applicable parts diagram.
- Note the original component arrangement.
- Photograph washers, spacers, or retainers if helpful.
- Remove the applicable retaining hardware.
- Remove the original shoulder bolt.
- Inspect the shoulder-contact surfaces.
- Inspect adjoining bushings or mounting holes.
- Clean the mounting area.
- Position the new 532170165 Shoulder Bolt correctly.
- Reinstall applicable washers, spacers, and retainers.
- Tighten according to the equipment-specific service requirements.
- Verify that any pivoting component moves freely.
- Check for excessive play or binding.
- Reinstall all guards or covers before operation.
Installation Tips
During installation:
- Match the original bolt orientation
- Keep washers and spacers in their original order
- Inspect the mating hole before installing the new bolt
- Start threads by hand where practical
- Avoid cross-threading
- Do not overtighten a pivoting assembly
- Make sure the shoulder, not the threads, supports the intended component
- Verify free movement after tightening
- Check for excessive side-to-side play
- Follow the equipment-specific torque requirement where available
Why Correct Shoulder Length Matters
Shoulder bolts can differ even when they share the same thread size.
Important dimensions include:
- Shoulder diameter
- Shoulder length
- Thread length
- Overall length
- Head style
An incorrect shoulder length can change component spacing or prevent the assembly from moving correctly.
Use 532170165 as the primary fitment reference.
Important Notes
- Verify compatibility with your exact equipment model, product number, serial number, and assembly before ordering.
- Match part number 532170165 directly with the applicable OEM parts documentation.
- 532170165 is a 5/16-18 shoulder bolt.
- The thread specification is 5/16-18 UNC.
- The shoulder provides a defined smooth bearing or positioning surface.
- This component should not automatically be replaced with a fully threaded standard bolt.
- The exact installation location is model dependent.
- Do not assume every Husqvarna mower or tractor uses 532170165.
- Do not select a replacement fastener solely by thread size.
- Shoulder diameter, shoulder length, overall length, head configuration, and application must also match.
- Use 532170165 as the primary fitment reference.
- Inspect the shoulder for wear whenever servicing the assembly.
- Inspect adjoining bushings, brackets, arms, and mounting holes.
- Replace damaged nuts, washers, spacers, or retaining hardware as necessary.
- Do not force the bolt into damaged or mismatched threads.
- Do not cut, grind, drill, weld, shorten, or otherwise modify the replacement bolt.
- Follow the equipment-specific tightening or torque specification where available.
- Verify that pivoting components move freely after installation.
- Shut off the engine and prevent accidental starting before servicing equipment hardware.
- Securely support the equipment if access requires raising it.
- This listing is for one Husqvarna 532170165 5/16-18 Shoulder Bolt only unless otherwise specified. Nuts, washers, bushings, spacers, brackets, and other associated components are sold separately unless explicitly included.
- Match Husqvarna 532170165 with your equipment's OEM parts documentation before ordering to ensure proper fitment.
