At a Glance
- SKU: F9N916L-LOTOF16
PRODUCT INFORMATION
Product Details
Trailer Suspension Hardware / Tandem-Axle Service Pack
Lot of 16 9/16"-18 Serrated Hex Flange Nuts Black for Trailer U-Bolt Hardware
Customer-friendly full tandem-axle quantity for trailer U-bolt service using sixteen replacement nuts across four tie-plate positions.
Part Number: FPN916L-LOTOF16 16 Nuts • Fits 9/16"-18 U-Bolt Hardware
Overview
This listing is for a lot of sixteen black serrated hex flange nuts for trailer suspension and U-bolt hardware service. This quantity is ideal for tandem-axle repairs where two axles commonly use eight U-bolts and sixteen threaded ends total. Each nut uses a 9/16"-18 fine thread and a serrated flange designed to bite into the mating surface while spreading clamp load across the contact area.
R&P Service Insight
This is the kind of quantity that makes sense when a customer wants to service the whole running gear instead of piecing together one side at a time.
- Tandem Axle Coverage: Sixteen nuts covers two axles using eight U-bolts total.
- Serrated Locking: Each nut is built to grip the mating surface directly for better resistance to loosening.
- Cleaner Repair: Replacing the full nut count helps avoid mixing worn hardware with new components.
R&P Knowledge Hub
Compatibility: Designed for 9/16"-18 threaded studs or U-bolts, including UB-R303 and similar matching trailer hardware.
Vehicle / System Fit: Trailer suspension, axle, spring, tie-plate, and U-bolt hardware applications using matching 9/16"-18 threads.
Installation Notes: Verify thread pitch, contact surface condition, and mating hardware before tightening. Serrated flange nuts should seat directly against the mating surface so the serrations can grip correctly.
Performance Insight: The serrated flange design spreads load and helps resist rotation, which is useful in trailer applications where clamp retention and service reliability matter.
R&P Repair Insight
If you are replacing U-bolt hardware across a tandem-axle setup, replacing all sixteen nuts at once is often the cleaner and more consistent repair approach.
- Check the Thread: These nuts are for 9/16"-18 threads and are not interchangeable with other 9/16" thread pitches.
- Check the Surface: Serrations need a clean, solid mating surface to lock properly.
- Check the Quantity: This lot of 16 is ideal for two axles using eight U-bolts and four tie-plate positions total.
Features
Lot of 16 Quantity
Practical quantity for one complete tandem-axle U-bolt nut replacement set.
9/16"-18 Fine Thread
Matches 9/16"-18 threaded studs and U-bolts in compatible trailer hardware applications.
Serrated Flange Design
Built with a serrated flange to improve grip at the mating surface and help resist loosening.
Black Finish
Finished in black for a clean hardware look suited to trailer running gear service work.
Specifications
| Specification | Detail |
|---|---|
| Part Number | FPN916L-LOTOF16 |
| Product Type | Lot of 16 serrated hex flange nuts |
| Application | Trailer suspension, axle, tie-plate, and U-bolt hardware |
| Material / Finish | Black finish |
| Thread Size | 9/16"-18 UNF |
| Flange Diameter (B) | Approx. 1.10" |
| Across Flats (F) | Approx. 0.86" |
| Across Corners (G) | Approx. 0.99" |
| Overall Height (H) | Approx. 0.48" |
| Hex Height (J) | Approx. 0.32" |
| Flange Thickness (K) | Approx. 0.12" |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Trailer suspension and axle hardware systems |
| Primary Fit | 9/16"-18 threaded studs and U-bolts |
| Secondary Fit | UB-R303 and similar applications using the same thread specification |
| Service Quantity | Ideal for tandem axle service using eight U-bolts and sixteen required nuts |
| Notes | Verify thread pitch and application before ordering. Do not assume fit by diameter alone. |
Technical Diagram & Direct Measurement Table
The diagram below and the table beside it refer directly to the same measured callouts. This working version uses only the applicable dimensions shown on your diagram: A, B, F, G, H, J, and K.
| Diagram Callout | Measurement Reference | Value |
|---|---|---|
| A | Thread Size | 9/16"-18 UNF |
| B | Flange Diameter | Approx. 1.10" |
| F | Across Flats | Approx. 0.86" |
| G | Across Corners | Approx. 0.99" |
| H | Overall Height | Approx. 0.48" |
| J | Hex Body Height | Approx. 0.32" |
| K | Flange Thickness | Approx. 0.12" |
| Ref. | Nominal Hex Size | 7/8" |
| Ref. | Nut Style | Serrated hex flange nut |
| Ref. | Finish | Black |
| Ref. | Known Fitment | Fits UB-R303 U-bolt |
| Ref. | Pack Quantity | 16 nuts for tandem axle service |
Included Components
| Quantity | Item |
|---|---|
| 16 | 9/16"-18 serrated hex flange nuts |
| Part Number | FPN916L-LOTOF16 |
| Included | Black finish |
| Included | Serrated flange design |
| Service Use | Tandem axle quantity for eight U-bolts / sixteen threaded ends |
| Not Included | U-bolts, tie plates, washers, springs, axles, or other mounting hardware |
Verify thread pitch, dimensions, and application before installation. This lot must be matched to 9/16"-18 threaded hardware. The direct measurement table above refers to the same callouts shown on the diagram image.
lot of 16 9/16-18 serrated flange nuts black trailer hardware tandem axle u-bolt nut set 9/16-18 UNF black serrated lock nut UB-R303 compatible FPN916L-LOTOF16 tie plate axle repair hardware
Related Parts & Kits
Check fitment, measurements, and kit contents before ordering. Related parts may not be required for your repair.
Looking up part numbers in our catalog…
Your repair list1 item selected
Selected products are added together. Review the cart and verify kit contents to prevent duplicates. Prices and discounts are determined at checkout.
BEHIND THIS LISTING
PHOTOGRAPHY & RESEARCH
Ariah Granados
DIGITAL PRESENTATION & DEVELOPMENT
Ken Martin
ONLINE SALES & QUALITY ASSURANCE
Rayn Fisher
WE’RE HERE TO HELP
Not sure it fits?
Have your SKU or manufacturer part number, photos of the original part and mounting, and any critical measurements ready. Capacity, voltage, or bolt pattern can help too.
815-357-3292 · 270 E Jackson St · Seneca, IL 61360
CUSTOMER REVIEWS
Leave a Google review
Good people. Real trailer work.
Customer feedback summarized from Google and Yellow Pages. Dates are shown where available.
TRAILER PARTSGOOGLE
Ordered trailer repair parts repeatedly; praised fast service, careful packing, and accurate orders.
RV KEYSGOOGLE
Found the correct RV keys at a good price with free shipping; the keys worked as expected.
AXLE & LEAF SPRINGSGOOGLE
Needed an unusual axle and leaf-spring size; the team listened and helped him sort out the fit.
PARTS & SHIPPINGGOOGLE
Praised the OEM and aftermarket selection, discounts, quick shipping, and friendly parts staff.
CUSTOM AXLEGOOGLE
Got the axle he needed right away, set up with a custom spring perch.
WELDINGGOOGLE
Praised the polite staff and quality welding on a project.
GAS STRUTGOOGLE
Replacement struts brought a long-used door back to working order.
CUSTOM TRAILERGOOGLE
Had a trailer built to his needs at a fair price, then found parts for two other trailers in stock.
CUSTOMER SERVICEGOOGLE
Praised the customer service after working with R&P over several years.
GAS SHOCKGOOGLE
Found the gas shock he wanted at a good price with shipping included.
CARGO TIE-DOWNGOOGLE
Received swivel D-rings with backing plates and praised the price, correct order, and service.
PARTS DELIVERYGOOGLE
The right parts arrived the first time, with fast delivery and helpful staff.
PROJECT HELPYELLOW PAGES
Said project advice and prompt shipping helped finish a trailer project.
SHIPPINGYELLOW PAGES
Reported helpful service and fast shipment to Germany.
SUSPENSION KITYELLOW PAGES
Praised a suspension kit, fair pricing, and good parts.
TRAILER CORDYELLOW PAGES
Was pleased with a replacement trailer cord.
SERVICE & PARTSYELLOW PAGES
Noted dependable service and products across repeat visits.
AXLE INSTALLATIONYELLOW PAGES
Said the axle installation fit perfectly and thanked Josh and the crew.
HITCH REPLACEMENTYELLOW PAGES
Praised the crew’s professionalism during a difficult hitch replacement.
PRICE & SERVICEYELLOW PAGES
Liked the product, price, communication, and shipping.
LISTING INFORMATIONYELLOW PAGES
Said the product description explained what would work for the trailer.
PRODUCT & SHIPPINGYELLOW PAGES
Received the item as described with very fast shipping and plans to return.
COMMUNICATION & SHIPPINGYELLOW PAGES
Praised accurate description, quick shipping, and clear communication.
PRICE & PRODUCTYELLOW PAGES
Was happy with the product and its price.
SELLER EXPERIENCEYELLOW PAGES
Called it a pleasure doing business with R&P.
INSTALLATIONYELLOW PAGES
Was pleased with product quality, quick delivery, and an easy installation.
PRODUCTSYELLOW PAGES
Was enthusiastic about the products.
DURABILITYYELLOW PAGES
Was ready to install the product on every trailer they own.
REPEAT CUSTOMERYELLOW PAGES
Expected to buy again after a good experience.
INSTALLED PARTYELLOW PAGES
Reported that the newly installed parts were working perfectly.
REPEAT CUSTOMERYELLOW PAGES
Said things went well, as they had on previous visits.
COMMUNICATION & VALUEYELLOW PAGES
Praised clear communication and fair value.
TRANSACTIONYELLOW PAGES
Said the transaction went as expected.
PRICE & PACKAGINGYELLOW PAGES
Noted good value, careful packing, and fast shipping.
PROFESSIONAL SERVICEYELLOW PAGES
Found the team professional and easy to work with.
COMMUNICATION & SHIPPINGYELLOW PAGES
Praised fast shipping and good communication.
TEAMYELLOW PAGES
Shared appreciation for the owners and their company.
SHIPPINGYELLOW PAGES
Reported prompt shipping and said they would buy again.
CUSTOMER SERVICEYELLOW PAGES
Found R&P easy to deal with.
SERVICEYELLOW PAGES
Praised the people and the service.
FIT & SHIPPINGYELLOW PAGES
Reported a good fit, fair price, accurate listing, and quick shipping.
DELIVERYYELLOW PAGES
Received the order a day early and recommended the seller.
CUSTOM TRAILERYELLOW PAGES
Described a no-hassle, professional custom-trailer purchase.
TRAILER PURCHASEYELLOW PAGES
Praised a new trailer, custom additions, helpful staff, and clear pricing.
HUB COVERSYELLOW PAGES
Found the right hub covers quickly and got helpful maintenance advice.
AXLE HELPYELLOW PAGES
Said R&P helped their company get back on the road after an axle problem.
DUMP TRAILERYELLOW PAGES
Was happy with a dump-trailer purchase after comparing options.
BRAKES, DRUMS & SEALSYELLOW PAGES
Received clear help choosing brake assemblies and bearing seals, followed by fast shipping.
DUMP TRAILERYELLOW PAGES
Found a good deal on a 16-foot dump trailer and planned to return.
FRIENDLY SERVICEYELLOW PAGES
Thanked the staff for their patience and recommended the shop.
Showing 3 of 50
Need help with this part? Send photos, part numbers, and measurements. We’ll help you narrow it down.