Fastening Bolts/Clamps: Torque Range 20-200 Nm

Component Specifications

Definition

Precision-engineered fastening components designed to securely attach manhole covers and access panels to machinery frames, ensuring proper alignment, load distribution, and safety compliance in industrial environments. These components prevent unauthorized access, contain fluids or gases, and maintain structural integrity under operational stresses.

Working Principle

Fastening bolts utilize threaded engagement to create clamping force between the manhole cover and machine frame, while clamps employ mechanical leverage or compression to secure covers without permanent attachment. Both systems distribute loads evenly to prevent deformation and ensure reliable sealing.

Materials

High-strength steel (ASTM A307, ASTM A325), stainless steel (AISI 304/316), or corrosion-resistant alloys; may include zinc plating, hot-dip galvanizing, or polymer coatings for environmental protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Size	M8 to M24
Torque Range	20-200 Nm
Clamping Force	5-50 kN
Tensile Strength	400-800 MPa
Temperature Range	-40°C to 200°C
Corrosion Resistance	Salt spray test >500 hours

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4014, ISO 4017, DIN 931, DIN 933, ASME B18.2.1

Parent Products

This component is used in the following industrial products

Manhole/Cover

A removable cover providing access to the interior of cleaning solution tanks for inspection, maintenance, and cleaning operations.

View Product Details

Engineering Analysis

Risks & Mitigation

Over-torquing causing bolt failure
Corrosion leading to seizure
Improper alignment causing seal leakage
Vibration-induced loosening

FMEA Triads

Trigger: Incorrect torque application
Failure: Bolt stripping or breakage
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications; implement regular torque audits.

Trigger: Environmental corrosion
Failure: Reduced clamping force or seizure
Mitigation: Select appropriate corrosion-resistant materials; apply protective coatings; conduct periodic inspections and maintenance.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance: 6g for bolts, 6H for nuts per ISO 965-1; dimensional tolerance ±0.1mm per ISO 2768-m

Test Method

Tensile testing per ISO 898-1; torque-tension testing per ISO 16047; corrosion resistance per ASTM B117

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Fastening Bolts/Clamps

Manufacturer profiles associated with Fastening Bolts/Clamps.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What are the key differences between bolts and clamps for manhole covers?

Bolts provide permanent, high-strength threaded fastening with precise torque control, ideal for heavy-duty applications. Clamps offer quick-release functionality for frequent access, using mechanical compression without threads, suitable for maintenance-heavy environments.

How do I select the right material for corrosive environments?

For mild corrosion, use zinc-plated steel. For moderate corrosion, choose hot-dip galvanized steel. In highly corrosive or chemical-exposed areas, specify stainless steel (AISI 316) or polymer-coated alloys to ensure longevity and safety.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Fastening Bolts/Clamps