HEXPHANT M3 x 20 mm Socket Head Cap Screws, 50-Pack

HEXPHANT M3 socket head cap screws are listed as 20 mm long and fully threaded, with a black oxide finish and an internal hex drive. The listing claims stainless steel construction and says a hex spanner is included, making this pack a fit to consider for metric fastening jobs that use this size.

At a glance

M3 x 20 size with fully threaded machine-screw threads, according to the listing.
Internal hex socket drive and socket cap head style.
The title and feature text identify black oxide 304 stainless steel, while the details separately list only stainless steel.

Price

$3.69Save 50%

Reference price: ~~$7.39~~

Price checked: Nov 12, 2026

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Often bought together

M3 x 16mm(50 Pack) Hex Socket Head Cap Screws Bolts, Black Oxide 304 Stainless Steel 18-8, Hex Drive, Bright Finish Fully Machine Thread

$6.99

100pcs M3 x 12mm 12.9 Grade Alloy Steel Hex Socket Head Cap Screws Bolts | Black Oxide Finish, Full Thread ,Allen Socket Drive

$6.96

Pros and cons

Pros

50 screws in one pack suit jobs needing several matching fasteners.
Internal hex drive provides a tool-engagement style for tightening with a compatible hex key.
Fully threaded construction is suitable where threads are needed along the screw shank.

Technical specifications

17 specifications

Identity
Brand	HEXPHANT
Fastener type	Socket Screws
Head style	Socket
Head type	Cap

Dimensions and installation
Fastener size	M3 x 20
Thread size	M3
Item diameter	3 millimeters
Dimensions listed	2 x 1 x 0.3 inches
Thread coverage	Fully Threaded
Thread type	Metric
Thread direction	Right Hand
Drive system	Internal Hex
Point style	Flat Point

Materials and finish
Material listed	Stainless Steel
Exterior finish	Black Oxide

Pack details
Number of pieces	50
Number of packs	1

What to know before buying

Listing details to confirm

The listing is inconsistent about material specificity: its title and feature text claim black oxide 304 stainless steel (18-8), while the details only specify stainless steel. The stated 2 x 1 x 0.3 inches are also listed as item dimensions, not screw dimensions. Confirm the material grade and actual screw dimensions against your application.

Who is it for?

A good fit for

Buyers seeking M3 x 20 fully threaded socket head cap screws for metric assembly or repair.
Projects where an internal hex drive and black finish are desired.

Less suited to

Buyers who need a confirmed material grade or dimensions beyond the listed M3 x 20 size without verifying them first.
Jobs requiring a different thread size, screw length or head style.

HEXPHANT M3 x 20 mm Socket Head Cap Screws, 50-Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 68 ratings

5 stars82%82%
4 stars9%9%
3 stars4%4%
2 stars0%0%
1 star5%5%

Aggregate ratings are mostly in the five-star category, with a smaller spread across lower ratings, including some one-star ratings. This indicates generally favorable ratings alongside some dissatisfaction, but without review text the reasons are unknown. The ratings do not verify the listed material grade, dimensions or included tool.

Frequently asked questions

What size are these screws?

The listing gives the fastener size as M3 x 20 and the thread size as M3. It also lists overall item dimensions as 2 x 1 x 0.3 inches, which are not presented as screw dimensions.

Are the screws fully threaded?

Yes. The listing specifies Fully Threaded.

What material are they made from?

The title and feature text claim black oxide 304 stainless steel (18-8), but the technical details say only stainless steel. Confirm the grade if it matters to your project.

Is a hex spanner included?

The title and feature text claim a hex spanner is included, but no explicit box inventory is supplied. Check the selected listing's package details.