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Home Product Cylindrical Head Hex Socket Screw M4x40 - DIN 912, High-Strength, Machinery, Electronics, Furniture
Cylindrical head hexagon socket screws M4*40

Cylindrical Head Hex Socket Screw M4x40 - DIN 912, High-Strength, Machinery, Electronics, Furniture

M4 socket head cap screws
M4x40 hex socket screws
M4 allen screw 40mm
Cylindrical head hexagon socket screws M4*40
M4 socket head cap screws (M4x40 hex socket screws) with cylindrical head, 40mm length; precision-engineered M4 allen screws 40mm for secure fastening applications.
Categories:Fasteners & Fixings
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Product Description

The M4 socket head cap screws (also known as M4x40 hex socket screws) are cylindrical fasteners with a 4mm thread diameter and 40mm length, featuring an internal hexagonal drive (allen screw design). Made from steel with optional corrosion-resistant coatings, these M4 allen screw 40mm variants are designed for high-torque applications requiring flush surface installation. With a hexagonal socket depth of 3mm±0.2 and thread pitch of 0.7mm, they demonstrate 12.9 grade tensile strength (minimum 1220 MPa). Typical operating temperature ranges from -50°C to +150°C, suitable for industrial machinery, automotive assembly, and precision equipment manufacturing. Their key advantages include space-saving low-profile heads and reduced slippage compared to external drive fasteners, though requiring proper allen key alignment to prevent socket deformation. These screws commonly pair with ISO 4762 standards-compliant components in mechanical engineering applications.
ParameterSpecification
Product ModelCylindrical Head Hexagon Socket Screws M4*40
Screw TypeM4 Socket Head Cap Screw / M4x40 Hex Socket Screw / M4 Allen Screw 40mm
Thread SizeM4 (Metric Coarse)
Length40 mm
Head TypeCylindrical (Domed)
Hex Socket Size3 mm (Allen Key)
MaterialCarbon Steel (Grade 4.8) / Stainless Steel (A2-70)
Surface FinishZinc Plated / Black Oxide
Strength Class4.8 / 8.8 / A2-70
Torque Value2.8–3.4 N·m (Grade 8.8)
Standard ComplianceDIN 912 / ISO 4762
Length Tolerance±0.5 mm
Thread Pitch0.7 mm (Standard)
Packaging UnitBulk / Box of 100/500 pcs
question:Can the company ensure stable supply?
answer:Yes, we maintain a robust production system and ample inventory to ensure consistent and timely supply.
question:What shipping methods are available?
answer:We support major carriers including DHL, FedEx, UPS, ensuring efficient and reliable global delivery.
question:What payment terms do you accept?
answer:We accept TT, PayPal, and other mainstream payment methods for secure and flexible transactions.
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:Can the company ensure stable supply?
answer:Yes, we maintain a robust production system and ample inventory to ensure consistent and timely supply.
question:What shipping methods are available?
answer:We support major carriers including DHL, FedEx, UPS, ensuring efficient and reliable global delivery.
question:What payment terms do you accept?
answer:We accept TT, PayPal, and other mainstream payment methods for secure and flexible transactions.
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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