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Home Product Metric External Hexagonal Bolts M4x40 | DIN 933 A2-70 Stainless Steel Hex Head Screws for Machinery & Automotive
Metric external hexagonal bolts M4*40

Metric External Hexagonal Bolts M4x40 | DIN 933 A2-70 Stainless Steel Hex Head Screws for Machinery & Automotive

M4x40 hex bolt
Metric external hex bolt M4
M4-40 hex head screw
Metric external hexagonal bolts M4*40
M4x40 hex bolt, Metric external hex bolt M4, M4-40 hex head screw. ISO standard DIN 933 compliant metric hexagon head bolt, 4mm diameter, 40mm length, full thread. Steel material, zinc-plated finish, compatible with M4 nuts. Ideal for machinery, automotive, and industrial assembly applications.
Categories:Fasteners & Fixings
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Product Description

The M4x40 hex bolt, also recognized as the Metric external hex bolt M4 or M4-40 hex head screw, is a precision-engineered fastener with a 4 mm nominal diameter and 40 mm shaft length, adhering to ISO metric thread standards. Designed for robust mechanical assembly, it features an external hexagonal head compatible with 7 mm wrenches and is commonly manufactured in steel or stainless steel with optional zinc plating for corrosion resistance. This bolt excels in machinery, automotive, and construction industries, offering high tensile strength (up to 8.8 grade) and vibration-resistant threading. Optimal performance spans -30°C to 120°C environments. While lacking electrical interfaces or power requirements, its standardized sizing ensures broad compatibility. Key advantages include durability and tool accessibility, though proper torque control (recommended 3.4-4.6 Nm for steel variants) is critical to prevent thread deformation during installation.
ParameterSpecification
Thread SizeM4x40 mm
Product ModelMetric external hex bolt M4-40 / M4x40 hex bolt
Head TypeHexagonal (external)
MaterialCarbon steel (Grade 8.8)
Strength ClassISO 898-1 Class 8.8
Surface TreatmentZinc-plated (5-8µm)
Hex Width Across Flats7.0 mm (ISO 4017)
Head Height2.8±0.3 mm
Thread Pitch0.70 mm (Standard coarse thread)
Thread LengthFull thread (40 mm)
StandardDIN 931 / ISO 4017
Tensile Strength800 MPa minimum
Surface Hardness250-320 HV
Maximum Torque4.4 N·m (dry)
Temperature Range-50°C to +120°C
question:Why can other suppliers find discontinued models you can't offer?
answer:Suppliers may source from residual stock or refurbished items, which we avoid to ensure quality and authenticity.
question:Can you provide shipping photos or purchase dates for similar products?
answer:We can share generic product images, but specific shipment details or purchase dates are confidential and not disclosed.
question:Does the company offer technical selection support?
answer:Yes, we provide technical guidance to help clients choose suitable products based on their specifications and requirements.
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:Why can other suppliers find discontinued models you can't offer?
answer:Suppliers may source from residual stock or refurbished items, which we avoid to ensure quality and authenticity.
question:Can you provide shipping photos or purchase dates for similar products?
answer:We can share generic product images, but specific shipment details or purchase dates are confidential and not disclosed.
question:Does the company offer technical selection support?
answer:Yes, we provide technical guidance to help clients choose suitable products based on their specifications and requirements.
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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