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Home Product M4*20 Metric External Hex Bolt | DIN 933 Full Thread Screw | Zinc Plated High Strength Fastener for Machinery Electronics Automotive Repair
Metric external hexagonal bolts M4*20

M4*20 Metric External Hex Bolt | DIN 933 Full Thread Screw | Zinc Plated High Strength Fastener for Machinery Electronics Automotive Repair

metric hex bolt M4x20
external hex head bolt M4
M4 hexagonal bolt 20mm
Metric external hexagonal bolts M4*20
Metric hex bolt M4x20, also known as an external hex head bolt M4, features a hexagonal head design with ISO/DIN compliance. This M4 hexagonal bolt 20mm length offers durable fastening for machinery, electronics, and structural assemblies. Made of stainless steel or zinc-plated steel.
Categories:Fasteners & Fixings
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Product Description

The metric hex bolt M4x20 is a precision-engineered external hex head bolt designed for robust mechanical fastening applications. This M4 hexagonal bolt 20mm features a 4mm nominal diameter and 20mm shank length with ISO metric threading, compliant with DIN 931/933 standards. The external hexagon head requires a 7mm wrench for installation, providing secure torque transmission in constrained spaces. Typically manufactured in steel with Class 8.8 strength rating, it offers 800 MPa tensile strength with optional zinc-plated or stainless steel (A2/A4) anti-corrosion finishes. Operational temperature ranges from -50°C to +150°C depending on material selection. Widely employed in automotive assembly, electronic enclosures, and machinery fabrication, these metric bolts excel in vibration resistance and uniform load distribution. While offering excellent shear strength, their external head profile may require additional clearance compared to low-profile alternatives. The M4x20 dimension balances holding power with minimal footprint, particularly suitable for thin material stack-ups in industrial equipment and precision instrumentation.
Parameter Specification
Designation Metric Hex Bolt M4x20
Thread Standard ISO 4017
Head Type External Hexagonal (DIN 931)
Nominal Diameter 4mm (M4)
Thread Pitch 0.7mm (Standard Coarse)
Length Under Head 20mm ±1.5mm
Head Height 2.8mm
Hex Key Size 7mm (AF Across Flats)
Material Grade Class 8.8 / A2-70 / Equivalent
Surface Finish Zinc Plated / Plain / Geomet®
Proof Load 580-660N/mm² (Grade 8.8)
Thread Length 16mm (Minimum Fully Threaded)
Weight (Approx.) 1.6g (Stainless Steel)
Torque Value 2.9-3.4Nm (Dry, Grade 8.8)
question:What shipping methods do you support?
answer:We support DHL, Fedex, UPS, and other major shipping methods for global shipments.
question:Why can't you supply prices for discontinued models while other suppliers can?
answer:Other suppliers might use old stock or substitutes, but we ensure authenticity and quality by not supplying discontinued models.
question:What is your warranty policy?
answer:Our warranty covers defects in materials or workmanship for one year, excluding damage from misuse or accidents.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:What shipping methods do you support?
answer:We support DHL, Fedex, UPS, and other major shipping methods for global shipments.
question:Why can't you supply prices for discontinued models while other suppliers can?
answer:Other suppliers might use old stock or substitutes, but we ensure authenticity and quality by not supplying discontinued models.
question:What is your warranty policy?
answer:Our warranty covers defects in materials or workmanship for one year, excluding damage from misuse or accidents.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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