M8 socket cap, low head, button, flat, set screws, hex bolts, nuts and washers – metric fasteners | Monster Bolts

M8 Screws, Bolts, Nuts & Washers – Socket Cap (Std, Low, Button, Flat), Set & Phillips

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The M8 metric screw (8 mm nominal diameter) is a heavy-duty standard used across machinery, engines, industrial builds, and fabrication. Monster Bolts offers a complete M8 line — Socket Cap (standard, low head, button, flat), Set Screws, Hex Cap Bolts, and Phillips Pan & Flat Machine Screws — plus matching M8 nuts and washers for a full fastening solution.

Shop by M8 Head Type

M8 Socket Head Cap Screws

DIN 912 / ISO 4762 • High clamp force • Allen/Hex drive

M8 Low Head Socket Cap Screws

Reduced head height • Tight clearance use • Allen/Hex drive

M8 Button Head Cap Screws

ISO 7380 • Low profile dome head • Allen/Hex drive

M8 Flat Socket (Countersunk) Screws

DIN 7991 / ISO 10642 • 90° countersink • Flush finish

M8 Cup Point Set Screws

Grub screws • Allen/Hex drive • Cup point

M8 Hex Cap Bolts

DIN 933 (full thread) / DIN 931 (partial) • External hex drive

M8 Phillips Pan Machine Screws

Machine thread • For tapped holes or use with nuts

M8 Phillips Flat Machine Screws

90° countersink • Flush finish • Machine thread

Quick Specs

Spec	Details
Diameter	M8 (8.0 mm nominal)
Common Pitch	1.25 mm (coarse)
Typical Drive	Internal hex/Allen for socket types; Phillips for machine screws; external hex for hex bolts. Need a key? Hex Key Hub or Individual Metric Keys.
Materials & Finishes	12.9 alloy steel, 18-8/A2 stainless, A4/316 stainless; black oxide or zinc where specified.

M8 Size & Pitch Reference

Need head dimensions, countersink details, or torque specs? See the M8 screw size chart.

Matching M8 Nuts & Washers

Pair your screws and bolts with the right hardware for a complete fastening solution:

Metric Nuts & Washers (All) — filter for M8 to match threads precisely.

Frequently Asked Questions

What’s the standard thread pitch for M8 screws?

The standard coarse pitch is 1.25 mm. Fine threads (1.0 mm or 0.75 mm) exist for precision applications.

How strong are M8 socket cap screws?

Grade 12.9 alloy socket cap screws offer the highest tensile strength in metric fasteners, ideal for mechanical assemblies requiring high torque retention.

What’s the torque spec for M8 screws?

Torque varies by material and head type. See the Metric Socket Screw Torque Chart for accurate torque values.

Do black oxide screws resist corrosion?

Black oxide provides a mild protective finish and a uniform dark appearance. Stainless options (A2 or A4) are recommended for moisture exposure or outdoor use.

Explore related sizes:

M6 Screws | M10 Screws