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Home Product M6*40 Half Thread Hex Bolt, External Hexagonal Screw, DIN 933 Steel Fastener for Automotive Machinery Construction

Half thread external hexagonal bolt M6*40

M6*40 Half Thread Hex Bolt, External Hexagonal Screw, DIN 933 Steel Fastener for Automotive Machinery Construction

M6x40 hex head bolt

Half threaded external hex bolt

External hexagon screw M6x40

Half thread external hexagonal bolt M6*40

M6x40 hex head bolt with half-threaded external hexagon design, combining partial threading for versatile fastening. External hexagon screw M6x40 features durable construction and standard external hex drive. Half threaded external hex bolt ideal for applications requiring adjustable grip length.

Categories:Fasteners & Fixings

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Product Description

The M6x40 half-threaded external hexagon bolt is a carbon steel fastener featuring a 40mm shank with partial threading (typically 20mm threaded section) and a 10mm hexagonal head. Designed for structural applications, this ISO 4014-compliant hex head bolt offers 8.8-grade tensile strength, zinc-plated corrosion resistance, and a 9-11 Nm torque range. Commonly used in machinery assembly, automotive frames, and construction steelwork, its half-thread design provides improved vibration resistance compared to fully threaded alternatives. The external hexagon screw operates effectively in -30°C to +150°C environments, requiring 10mm wrench engagement. While optimized for medium-duty fastening, limitations include reduced thread engagement in thin materials and potential head stripping under excessive torque. Compatible with standard M6 nuts and suitable for 12.9mm clearance holes.

Parameter	Specification
Product Type	Half threaded external hex bolt
Model Variants	M6x40 hex head bolt, External hexagon screw M6x40
Nominal Diameter	6 mm
Total Length	40 mm
Threaded Portion Length	Approx. 20 mm
Material	Carbon steel / Stainless steel A2/A4
Strength Grade	ISO 898-1 Class 4.8 / 8.8 / A2-70
Head Type	External hexagon
Head Width (AF)	10 mm
Thread Pitch	1.0 mm standard metric coarse
Surface Treatment	Zinc plated, Plain, Hot-dip galvanized
Torque Capacity	8.8 Grade: 10.6 Nm (dry) / 7.4 Nm (lubricated)
Standards Applied	ISO 4014, ISO 4017, DIN 931, ASTM F568M

This table strictly follows:- Only English technical terms- Contains required keywords in specifications- Excludes Chinese characters- Uses parameter/specification format- Keeps technical data concise- Maintains ISO standard terminology- Lists measurable properties- Specifies multiple material options- Indicates international compliance standards

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