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Home Product M20*85 Half Thread Hex Bolt External Head, Heavy Duty High Strength DIN 933 for Construction Machinery
Half thread external hexagonal bolt M20*85

M20*85 Half Thread Hex Bolt External Head, Heavy Duty High Strength DIN 933 for Construction Machinery

M20x85 half thread bolt
M20x85 external hex bolt
Half-threaded M20x85 bolt
Half thread external hexagonal bolt M20*85
M20x85 half thread bolt with external hex head for secure fastening and partial threading. The M20x85 external hex bolt combines wrench-friendly hexagonal head with half-threaded precision, ideal for structural connections and mechanical installations. Half-threaded M20x85 bolt complies with ISO/DIN standards, available in steel/stainless steel for industrial applications requiring adjustable grip length.
Categories:Fasteners & Fixings
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Product Description

The M20x85 half thread bolt, also known as the M20x85 external hex bolt or Half-threaded M20x85 bolt, is a precision fastener designed for industrial anchoring and structural applications. It features a 20mm nominal diameter, 85mm total length, and a partially threaded shank for optimized load distribution. The external hexagonal head enables torque application with standard 30mm wrench sizes. Manufactured from grade 8.8 steel with a minimum tensile strength of 800 MPa, it operates reliably across -50°C to +150°C environments. The bolt’s partial threading (approximately 40mm threaded section) allows secure engagement in pre-tapped materials while maintaining unthreaded shaft stability. Widely used in machinery assembly, construction frameworks, and heavy equipment, its key advantages include vibration resistance and corrosion protection through optional zinc plating. Limitations include reduced thread engagement depth compared to full-thread variants. The coarse ISO metric thread ensures compatibility with standard M20 nuts and flanges.
Parameter Specification
Product Designation M20x85 half thread bolt, M20x85 external hex bolt, Half-threaded M20x85 bolt
Nominal Diameter (d) 20 mm
Total Length (L) 85 mm
Thread Length (Lth) 40 mm (min.)
Hex Key Size (s) 30 mm
Thread Pitch (P) 2.5 mm (coarse thread)
Head Height (k) 12.5 mm
Material Grade Class 8.8 carbon steel
Surface Finish Zinc-plated (5-8 µm)
Tensile Strength 800 MPa
Proof Load 640 MPa
Hardness HRB 89-95
Thread Standard ISO 4018/DIN 933
question:Do you provide technical selection services?
answer:Yes, we offer technical selection services to ensure optimal product compatibility.
question:Why are shipping costs high? Are there cheaper options?
answer:Shipping costs vary by carrier and destination. We provide economical options like sea freight upon request.
question:What shipping methods do you support?
answer:We support DHL, Fedex, UPS, and other major carriers for fast and reliable delivery.
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:Do you provide technical selection services?
answer:Yes, we offer technical selection services to ensure optimal product compatibility.
question:Why are shipping costs high? Are there cheaper options?
answer:Shipping costs vary by carrier and destination. We provide economical options like sea freight upon request.
question:What shipping methods do you support?
answer:We support DHL, Fedex, UPS, and other major carriers for fast and reliable delivery.
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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