• ALL18660-50.jpg
    • Allstar Performance Aluminum Countersunk Washer — No. 10 Hole x 1in OD, Natural, 50-Pack | ALL18660-50
    • Allstar Performance Aluminum Countersunk Washer — No. 10 Hole x 1in OD, Natural, 50-Pack | ALL18660-50
    • Allstar Performance Aluminum Countersunk Washer — No. 10 Hole x 1in OD, Natural, 50-Pack | ALL18660-50
    • Allstar Performance Aluminum Countersunk Washer — No. 10 Hole x 1in OD, Natural, 50-Pack | ALL18660-50
    • ALL18660-50.jpg

    Allstar Performance Aluminum Countersunk Washer — No. 10 Hole x 1in OD, Natural, 50-Pack | ALL18660-50

    Vendor: Allstar Performance
    Part Number: ALL18660-50
    $45.99

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
    Payment & Security

    Secure, encrypted checkout. Card details go straight to the payment processor and are never stored by us.

    • Amazon
    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Venmo
    • Visa
    Share to:
    View Full Details
    Product DetailsFAQReviewsRelated Products

    This Allstar Performance countersunk washer is machined from aluminum with a countersunk profile that seats flush with countersunk screw and bolt heads. It measures a Number 10 hole by 1 in outside diameter and 0.188 in thick, finished in natural aluminum. This washer is sold as a set of 50, part number ALL18660-50.

    Spec Sheet: Allstar Spec Sheet

    Compatibility

    This is a universal hardware washer, not vehicle-specific, suited to any application using a Number 10 fastener within the 1 in OD dimension listed above. It is also available in a black anodized finish (part number ALL18661-50) for finish matching, and in a 10-pack size (part number ALL18660) for smaller-quantity needs.

    FAQ

    What size is this Allstar Performance countersunk washer?

    This countersunk washer is sized for a Number 10 hole with a 1 in OD and 0.188 in thickness, sold as a set of 50 under part number ALL18660-50.

    What material and finish is this washer made from?

    This washer is machined from aluminum and finished in natural (unanodized) aluminum.

    Is this washer sold individually or as a set?

    This washer is sold as a set of 50 pieces under part number ALL18660-50.

    Does this washer fit a specific vehicle?

    No, this is a universal countersunk washer suited to any application using a Number 10 fastener within the listed 1 in OD dimension; it is not vehicle-specific.

    Is a different finish or pack size available?

    Yes. This natural finish, 50-pack washer is also available in a black anodized finish (part number ALL18661-50) and in a 10-pack size (part number ALL18660).

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy
    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

    Related Products

    Recently Viewed