Core Features of DIN931 Hex Bolt Half Thread

1.Half-thread design: Smooth shank reduces installation resistance, avoids thread damage during assembly
2.Strong holding force: Threaded section ensures tight engagement with nuts, stable load-bearing
3.Hex head: Enables efficient torque transmission with standard wrenches, easy operation
4.Suitable for thick workpieces: Smooth shank adapts to deep holes, reducing stress concentration
5.High compatibility: Matches standard nuts/washers, wide application in general and heavy-duty scenarios

Product Parameter (Specification)

Standard	DIN,ASTM/ANSI, JIS, EN, ISO,AS	Material	Carbon steel, Stainless Steel, Aluminum0,Brass
Surface Treatment	Zinc Plated, Hop Dip Galvanized(HDG) phosphorization, Black Oxide,Geomet,Dacroment,Nickel plated,Zinc-Nickel plated	Shank	Half thread
Grade	4.8, 5.6, 6.8, 8.8, 10.9, 12.9, B7, B7M, B8, B8M	Size	M3-M64
Unite	Piece,KGS,TON	Packing	Bulk cartons with pallet, small boxes in cartons with pallet

Product Application

DIN931 Hex Bolt Half Thread is widely used in heavy Industry, mining, water treatment, healthcare, retail industry, general industry, Oil & Gas, automotive industry etc.

DIN 931 Part-Threaded Hex Bolt Application Scenario Table

Application Field	Specific Application Scenario	Recommended Standards & Grades	Key Considerations
General Machinery Manufacturing	Fixing of bearing housings, gearbox casings, and motor end caps in industrial pumps, compressors, and conveyors.	– DIN 931 (primary standard) – Performance Grades: 4.6, 5.6, 8.8 – Materials: Carbon steel (C10-C15), alloy steel (40Cr for Grade 8.8)	– Part-threaded advantage: Use the unthreaded shank (smooth part) for transition fit with holes to improve positioning accuracy. – Surface treatment: Black oxide (indoor dry environment) or phosphating (oil-mist areas). – Match with DIN 934 hex nuts; ensure the nut fully engages the threaded section.
Construction & Installation	Connection of steel scaffolding, fixed supports for ventilation ducts, and base fixing of small steel structures.	– DIN 931 Grade 5.6/8.8 – Surface treatment: Hot-Dip Galvanizing (HDG, outdoor) or electro-galvanizing (indoor)	– Load capacity: Grade 8.8 for scaffolding with ≥500kg/m load; Grade 5.6 for light supports. – Corrosion resistance: HDG coating thickness ≥ 85μm for outdoor scaffolding.
Automotive & Transportation	Fixing of truck axle brackets, trailer frame connections, and non-critical engine accessories.	– DIN 931 Grade 8.8 (high-load parts), Grade 5.6 (light accessories)	– Shank shear resistance: The unthreaded shank withstands lateral shear forces from vehicle vibration. – Material traceability: Provide MTR for Grade 8.8 bolts used in axle brackets.
Agricultural Machinery	Fixing of tractor plow frames, harvester cutting system supports, and grain dryer chassis connections.	– DIN 931 Grade 8.8 – Surface treatment: Phosphating + anti-rust oil (dust-prone) or HDG (outdoor wet fields)	– Vibration resistance: Pair with DIN 127 spring washers to prevent loosening from machinery oscillation. – Wear resistance: The smooth shank reduces friction with mating holes during machinery operation.
Equipment Maintenance & Repair	Replacement of damaged bolts in printing machines, textile equipment, and small industrial fans.	– DIN 931 Grade 4.6/5.6, Grade 8.8	– Dimensional matching: Confirm bolt diameter, length, and thread pitch – Cost-effectiveness: Grade 4.6 for non-critical repairs to reduce maintenance costs.

Hex bolt with partial threading for mechanical fastening.

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DIN931 Hex Bolt Half Thread

1.Complies with DIN 931, ISO 898-1, ASTM A325, categorized as half-thread hexagonal bolts

2.Material: Carbon steel (45#), alloy steel (42CrMo) or stainless steel (304/316); strength grades 4.8–12.9

3.Structure: One-piece hex head + half-thread shank (threaded section at bolt end, smooth shank in middle)

4.Surface treatments: Zinc plating, black oxide, hot-dip galvanizing; size range M3–M364, length 20mm–150mm

Category: Hex Bolt

Description

Standard	DIN,ASTM/ANSI, JIS, EN, ISO,AS	Material	Carbon steel, Stainless Steel, Aluminum0,Brass
Surface Treatment	Zinc Plated, Hop Dip Galvanized(HDG) phosphorization, Black Oxide,Geomet,Dacroment,Nickel plated,Zinc-Nickel plated	Shank	Half thread
Grade	4.8, 5.6, 6.8, 8.8, 10.9, 12.9, B7, B7M, B8, B8M	Size	M3-M64
Unite	Piece,KGS,TON	Packing	Bulk cartons with pallet, small boxes in cartons with pallet

Application Field	Specific Application Scenario	Recommended Standards & Grades	Key Considerations
General Machinery Manufacturing	Fixing of bearing housings, gearbox casings, and motor end caps in industrial pumps, compressors, and conveyors.	– DIN 931 (primary standard) – Performance Grades: 4.6, 5.6, 8.8 – Materials: Carbon steel (C10-C15), alloy steel (40Cr for Grade 8.8)	– Part-threaded advantage: Use the unthreaded shank (smooth part) for transition fit with holes to improve positioning accuracy. – Surface treatment: Black oxide (indoor dry environment) or phosphating (oil-mist areas). – Match with DIN 934 hex nuts; ensure the nut fully engages the threaded section.
Construction & Installation	Connection of steel scaffolding, fixed supports for ventilation ducts, and base fixing of small steel structures.	– DIN 931 Grade 5.6/8.8 – Surface treatment: Hot-Dip Galvanizing (HDG, outdoor) or electro-galvanizing (indoor)	– Load capacity: Grade 8.8 for scaffolding with ≥500kg/m load; Grade 5.6 for light supports. – Corrosion resistance: HDG coating thickness ≥ 85μm for outdoor scaffolding.
Automotive & Transportation	Fixing of truck axle brackets, trailer frame connections, and non-critical engine accessories.	– DIN 931 Grade 8.8 (high-load parts), Grade 5.6 (light accessories)	– Shank shear resistance: The unthreaded shank withstands lateral shear forces from vehicle vibration. – Material traceability: Provide MTR for Grade 8.8 bolts used in axle brackets.
Agricultural Machinery	Fixing of tractor plow frames, harvester cutting system supports, and grain dryer chassis connections.	– DIN 931 Grade 8.8 – Surface treatment: Phosphating + anti-rust oil (dust-prone) or HDG (outdoor wet fields)	– Vibration resistance: Pair with DIN 127 spring washers to prevent loosening from machinery oscillation. – Wear resistance: The smooth shank reduces friction with mating holes during machinery operation.
Equipment Maintenance & Repair	Replacement of damaged bolts in printing machines, textile equipment, and small industrial fans.	– DIN 931 Grade 4.6/5.6, Grade 8.8	– Dimensional matching: Confirm bolt diameter, length, and thread pitch – Cost-effectiveness: Grade 4.6 for non-critical repairs to reduce maintenance costs.

DIN931 Hex Bolt Half Thread

DIN 931 Part-Threaded Hex Bolt Application Scenario Table

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