0S1588 Cap Screw for CAT Equipment
- New Cap Screw Replacement suitable for Caterpillar Equipment
- Made to USA Specification
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Description for 0S1588 Hex Bolt
â–¶Specification for 0S1588 Hex Bolt
â–¶Exact Fit Guarantee for 0S1588 Hex Bolt
â–¶| Dimensions | 1.57x0.35x0.55 |
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At the beginning, I experienced significant delays and communication issues regarding my order, which honestly caused serious concern because the parts were urgently needed for an important project.
However, after continuous follow-up, the Propel Parts team handled the matter professionally, provided shipment tracking, and the parts finally arrived successfully.
I especially appreciate their willingness to communicate, acknowledge the issue, and continue working toward resolving the situation.
In international business, delays can sometimes happen, but what matters is the final commitment to resolving the issue properly.
Thank you to Daniel and the team, and hopefully future transactions will be smoother for both sides. -
perfect service
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Great company with outstanding customer service. Always get answers to my questions and always get my order to me quickly!
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Quick Response. Very much appreciated.
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Amazing Help.
I don't know who I spoke with, but they were helpful. We will be buying those parts shortly.
Frequently Asked Questions
What is the Caterpillar 0S1588 cap screw used for?
The 0S1588 is a standard hex head cap screw used across various Caterpillar equipment assemblies for securing covers, brackets, housings, and structural components. Cap screws are precision fasteners with controlled thread and dimensional tolerances that are critical in maintaining joint integrity under load.
What thread size and grade is the 0S1588 cap screw?
Specific thread dimensions and grade are listed in the product specifications. Always use the exact thread size and strength grade specified in the service manual for the joint ??? using a lower-grade cap screw can result in fastener failure under load.
When should I replace cap screws on my CAT equipment?
Replace cap screws that show thread damage, rounding of the hex drive, corrosion that reduces grip, or any that have been overtorqued and may have exceeded their yield strength. In safety-critical applications such as engine mounts or structural joints, replacement after any suspected overload is advisable.
Should I reuse cap screws after disassembly?
In general service applications, cap screws in good condition can often be reused. However, torque-to-yield fasteners ??? which are specifically designed for single use ??? must always be replaced. Check the service manual for the specific joint to determine if the fastener is intended for reuse.
Are high-quality aftermarket cap screws reliable for CAT equipment?
Yes. High-quality aftermarket cap screws manufactured to meet or exceed OEM specifications are used routinely in heavy equipment maintenance. For a broad range of compatible fasteners, explore our CAT hardware components catalog which covers bolts, screws, nuts, and washers across all equipment categories.
Should I apply thread-locking compound to cap screws?
Thread-locking compounds are used in specific applications where vibration loosening is a concern. Always follow the service manual guidance ??? some joints specify a particular thread locker while others require clean, dry threads for accurate torque-to-clamp-force control. Using compound where not specified can affect joint preload.
What warranty applies to this cap screw from Propel Parts?
All fastening hardware from Propel Parts carries a 1-year warranty against material defects. Same-day shipping is available on weekday orders, and 30-day returns are accepted with no hassle.

We know equipment downtime costs money, so fast and reliable shipping is a priority at Propel Parts. Orders placed on weekdays before 3:00 PM ET typically ship the same day, with expedited delivery options available for many locations when time is critical.
We ship across the U.S., Canada, and over 130 countries worldwide, helping customers keep machines running wherever they operate. Available shipping methods and delivery estimates are shown at checkout so you can select the option that best fits your timeline.
Tracking information is emailed within 24–48 hours after your order is processed, giving you full visibility from dispatch to delivery and peace of mind that your parts are on the way.

Our refund policy is simple. We offer a 30-day, no-hassle return policy, and we make every effort to provide the best service and highest-quality parts possible. If you’re not fully satisfied with your purchase, you may return it within 30 days for a refund. Full details are available on our Returns Policy page.

Buy with confidence. All parts from Propel Parts are covered against material or manufacturer defects for 12 months from the original invoice date. We stand behind every part we sell, so you can count on reliable performance and dependable support. Full details are available on our Warranty Policy page.
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