Product Summary

Longze High-Strength Bucket Elevator Bolts (DIN 15237 / Norway Style) are heavy-duty fasteners specifically designed to secure elevator buckets to conveyor belts in extreme-

wear environments. Manufactured in Yongnian, China, our elevator bolts feature an oversized thin-profile head with dual locking lugs (fangs) that bite into the belt, preventing the

bolt from spinning during high-torque tightening. Whether for grain elevators, cement plants, or heavy mining conveyors, Longze elevator bolts provide the flush-fit aerodynamics and superior clamping force required for high-speed vertical transport.

• ✔ Oversized Concave Head: The broad, thin head distributes the clamping load over a wide area of the belt, preventing "pull-through" failures even under the weight of heavy bulk materials.

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• ✔ Dual Locking Fangs: Precision-forged lugs under the head provide a positive mechanical lock into the belt carcass, allowing for one-sided installation and maintenance.

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• ✔ Flush Fit Profile: The low-profile head sits flush with the belt surface, minimizing friction with the pulley and reducing heat buildup during continuous operation.

• Standards: DIN 15237, ISO Equivalent, Norway Style (Large Head).

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• Diameter Range: M6 to M12 | 1/4" to 1/2".

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• Length Range: 20 mm to 60 mm.

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• Property Class: Class 8.8, 10.9 | Stainless Steel 304 (A2) & 316 (A4).

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• Matching Components: Supplied with Domed (Large) Washers et Nyloc / Hex Nuts.

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• Surface Finish: Zinc Plated, Hot Dip Galvanized (HDG), Black Oxide, Plain.

Mechanical Properties & Material Standards

• Matching the steel grade to the structural requirements of the transmission line.

• Property Class	Matériel	Tensile Strength (min)	Yield Strength (min)	Hardness Range
  Class 8.8	Medium Carbon Steel	800 MPa	640 MPa	22 - 32 HRC
  Class 10.9	Alloy Steel (SCM435)	1040 MPa	940 MPa	32 - 39 HRC
  SS304 (A2)	Acier inoxydable	700 MPa	450 MPa	200 - 280 HV
  SS316 (A4)	Acier inoxydable	800 MPa	600 MPa	240 - 320 HV

Standard Cross Arm Dimensions

• Common configurations for standard vertical belt conveyor systems.

• Thread Size (D)	Head Dia (dk)	Fang Width (s)	Head Height (k)	Weight (kg/1000pcs)
  M8	28 mm	12 mm	3.5 mm	21.50 kg
  M10	35 mm	15 mm	4.5 mm	42.80 kg
  M12	42 mm	18 mm	5.5 mm	75.20 kg

Galvanizing & Corrosion Resistance

• Ensuring 30+ years of service life in corrosive environments.

• Surface Treatment	Coating Thickness	Salt Spray Test	Best Application	Friction Support
  Zinc Plated	8 - 12 μm	72 - 144 Hours	Grain / Dry Silos	Standard
  Hot Dip Galv.	≥ 45 μm	500 - 800 Hours	Outdoor Fertilizer	High
  SS316 Polished	N/A	1000+ Hours	Chemical / Food	Extreme
  Dacromet	8 - 12 μm	500 - 1000 Hours	Mining / Wet Slurry	Optimized

Avoid Pitfalls:

• Head Deformation: Poorly forged heads can cupping under tension, leading to pulley wear. Longze uses Reinforced Cold-Heading to ensure the head maintains its concave profile under full torque.

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• Fang Shear: If the lugs are too brittle, they snap off during installation. We implement a specific tempering cycle for Class 8.8/10.9 bolts to ensure the fangs have the "bite" without being brittle.

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• Nut Back-off: Vibration is the #1 killer of elevator bolts. We strictly recommend using Longze DIN 985 Nyloc Nuts or our specialized Large Domed Washers to maintain constant tension on the belt.

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Perfect Fit Assembly:

• Matched Washers: Always use the Large Convex Washers (DIN 15237 Standard) provided in our kits. They are shaped to nest perfectly within the bucket's mounting holes.

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• Torque Consistency: For rubber belts, avoid over-torquing which can crush the belt carcass. Our 8.8 grade bolts provide the perfect balance of stretch and clamping force.

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Quality Control & Logistics:

• ISO 9001 Certified: 5-step QC including head-to-shank tensile testing, lug hardness verification, and thread gauge inspection.

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• Sea-Worthy Packaging: Bolts, washers, and nuts are pre-sorted and packed in heavy-duty 25kg cartons, plastic-lined for moisture protection, and palletized for export from our Yongnian hub.

• Q: What is the difference between DIN 15237 and Norway Style? A: DIN 15237 is the metric standard with specific head and fang dimensions. "Norway Style" often refers to the large-head variants (e.g., 35mm head for M10) favored in European and Brazilian heavy-duty mining. We supply both.

• Q: Can you provide these in Imperial (UNC) threads? A: Yes, we manufacture 1/4", 5/16", and 3/8" elevator bolts for North American and Middle Eastern maintenance projects.