Mardarth M12x1.5 Black Closed-End Spline Lug Nuts, 20-Piece

M12x1 Piece: Mardarth M-N042-12X1.5-BK-CA is a set of 20 black, closed-end spline tuner lug nuts listed with a 60-degree cone seat. The listing also claims a 1.38-inch height and Silverado replacement fitment, so verify the thread, seat and vehicle requirements before ordering.

At a glance

Listing specifies M12x1.5 thread pitch, closed ends and a 60-degree cone seat.
Described as a one-piece solid design, with a claimed 72-hour salt-spray test.
The listing names Silverado replacement as a fitment claim, not a complete vehicle compatibility list.

Price

$28.79Save 20%

Reference price: ~~$35.99~~

Price checked: Nov 13, 2026

View offer

Pros and cons

Pros

20 pieces provide a matching set for applications requiring that quantity.
Closed-end spline tuner design and a black zinc-nickel plated finish are specified in the listing.

Technical specifications

16 specifications

Identity
Brand	Mardarth
Model	M-N042-12X1.5-BK-CA
Fastener type	Lock
Pieces	20

Thread and installation
Thread size	12mm
Inside thread size	M12
Thread type	ISO Metric
Thread style	Right Hand
Thread coverage	Fully Threaded
Thread class	Coarse
Head style	Hex
Compatible groove diameter	12 millimeters

Materials and finish
Material listed	Alloy Steel
Exterior finish	Black
Finish type	Black Zinc-Nickel Plated

Dimensions and installation
Dimensions listed	15.2 x 20.3 x 20.3 centimetres

What to know before buying

Listing details to confirm

The title gives a 1.38-inch height and 60-degree cone seat, while product details do not independently confirm those dimensions. Confirm thread pitch, seat shape, nut height and vehicle or wheel fitment before purchase. The claimed Silverado replacement fitment is not a fitment guarantee.

Who is it for?

A good fit for

Buyers replacing a full set of 20 lug nuts who have confirmed M12x1.5 threads and a 60-degree cone seat.
Owners whose vehicle and wheels are confirmed to use the listed spline tuner style.

Less suited to

Anyone who has not confirmed the exact thread pitch, seat type and required lug-nut height for their vehicle and wheels.

Mardarth M12x1.5 Black Closed-End Spline Lug Nuts, 20-Piece · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 9 ratings

5 stars73%73%
4 stars13%13%
3 stars14%14%
2 stars0%0%
1 star0%0%

The supplied evidence includes aggregate ratings but no customer-comment summary. The rating breakdown is mostly five-star with some four- and three-star ratings, but the small sample does not establish specific strengths, defects or reasons for ratings. It offers limited guidance on fitment, so match the lug-nut specifications to your vehicle and wheel rather than relying on the rating alone.

Frequently asked questions

What thread size does the listing specify?

It lists an M12 inside thread and a 12x1.5 thread pitch. Confirm that both match your vehicle and wheel requirements.

What seat type is claimed?

The product title and feature text specify a 60-degree cone seat. Check that your wheel requires this seat shape before installation.

Is this set stated to fit Silverado vehicles?

The listing claims Silverado replacement fitment but does not provide a complete vehicle or year range. Verify the specific application and wheel requirements.