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Русский ISO 7040 prevailing torque nuts factory
XZ Fastener manufactures ISO 7040 prevailing torque nuts for buyers who need loosening-resistant fastening performance, controlled assembly behavior, and practical factory support for machinery, vehicles, equipment frames, and maintenance programs. These metric lock nuts use a non-metallic insert to create prevailing torque on the mating bolt thread, helping reduce loosening under vibration when correctly selected and installed. Carbon steel, alloy steel, and stainless steel options can be supplied with property class, thread pitch, finish, packing, and inspection requirements according to order requirement. Send size lists, mating bolt details, finish requirements, and quantity plans for quotation review.
Quick Specs
What Buyers Should Know Before Sourcing ISO 7040 Prevailing Torque Nuts
ISO 7040 prevailing torque nuts are hexagon lock nuts with a non-metallic insert that creates resistance on the mating bolt thread. They are used where vibration, movement, or service handling may loosen a standard hex nut. The insert material, temperature range, mating bolt grade, and thread condition should be checked before final selection.
These nuts are usually sourced as part of broader standard fasteners programs. Buyers should avoid mixing ISO 7040 descriptions with all-metal lock nuts because nylon insert behavior, reuse expectations, and temperature limits are different.
Factory Sourcing Notes
- Confirm metric diameter, pitch, property class, insert color, and finish.
- State mating bolt grade and whether assembly torque guidance is required.
- Check nylon insert temperature suitability for the application environment.
- Define carton quantity, label format, and inspection documents before production.
Common Purchasing Descriptions
Buyers may describe this product as ISO 7040 prevailing torque nuts, ISO 7040 nylon insert lock nuts, metric prevailing torque hex nuts, non-metallic insert lock nuts, nylon locking nuts, or metric self-locking nuts. For accurate quotation, provide size, pitch, property class, finish, quantity, insert requirement, and packing method.
Many factory purchasing lists include matching bolts and nuts in the same order. Along with ISO 7040 nuts, buyers may also request DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts. Related industrial bolts can be quoted together when mating parts are needed.
Detailed Specifications Table
| عنصر | Typical Requirement | Procurement Notes |
|---|---|---|
| قياسي | ISO 7040 | Prevailing torque type hexagon nuts with non-metallic insert; confirm current drawing or standard requirement. |
| Thread | Metric coarse thread, selected fine thread options | State pitch clearly, especially for fine thread or drawing-based orders. |
| نطاق الحجم | Common metric nut sizes such as M3 to M24 | Other sizes can be reviewed according to order requirement. |
| Property Class | Common classes 5, 8, 10; stainless options | Nut class should be matched with mating bolt strength and assembly requirement. |
| Locking Element | Non-metallic insert | Insert color and material details can be discussed according to buyer requirement. |
| مادة | Carbon steel, alloy steel, stainless steel | Material selection depends on strength, corrosion exposure, and cost target. |
| Finish | Zinc plated, black oxide, plain, nickel plated, passivated stainless | Coating should be compatible with insert installation and storage requirements. |
| Packing | Small boxes, bulk cartons, export cartons, pallet packing | Barcode labels, buyer item labels, and carton marks are available upon request. |
For special insert color, non-standard thread, customized packing, or drawing-based lock nuts, XZ Fastener can review custom fasteners according to drawings and order requirement.
Material and Grade Explanation
Carbon Steel and Alloy Steel
Carbon steel and alloy steel ISO 7040 prevailing torque nuts are used where strength, cost control, and stable assembly performance are important. Property classes such as 5, 8, and 10 can be discussed according to mating bolt grade and application requirement. Heat treatment, thread accuracy, and insert retention should be checked during production control.
Stainless Steel Options
Stainless steel lock nuts are suitable for moisture-exposed equipment, light outdoor use, and applications requiring improved corrosion resistance. A2 and A4 options can be reviewed upon request. Buyers should confirm insert material, expected temperature range, and whether passivation or special packing is required.
When selecting ISO 7040 nuts with other fastener products, buyers should compare bolt grade, thread engagement, locking performance, and the service environment of the final assembly.
Surface Finish Selection Guide
| Finish | Typical Use | Buyer Consideration |
|---|---|---|
| Zinc Plated | General machinery, equipment frames, and distributor stock | Common for carbon steel lock nuts; coating color and corrosion target can be discussed. |
| Black Oxide | Indoor machinery, tools, fixtures, and dark appearance assemblies | Usually requires oil protection; storage and packing conditions should be confirmed. |
| Nickel Plated | Visible components and controlled appearance applications | Useful when a brighter surface is needed; confirm environment before selection. |
| Plain Steel | Controlled indoor use or secondary finishing | Corrosion protection is limited; packing and storage conditions are important. |
| Plain or Passivated Stainless | Moisture-exposed assemblies and stainless fastener sets | Passivation can be requested for improved surface cleanliness and consistency. |
For orders that combine lock nuts with plated bolts, washers, or other hardware, XZ Fastener can also supply coated fasteners according to project requirement.
Manufacturing and Quality Control
Factory control for ISO 7040 prevailing torque nuts should cover raw material selection, nut forming, tapping, heat treatment when applicable, surface finishing, insert assembly, thread inspection, prevailing torque checks, sorting, and final packing. Important inspection points include across-flats dimension, nut height, thread fit, insert position, insert retention, hardness, coating appearance, and packing accuracy.
Because ISO 7040 nuts rely on insert-based locking performance, buyers should define whether prevailing torque testing, thread gauge inspection, hardness records, coating inspection, or packing verification is required. The DIN and ISO fastener standards guide can help purchasing teams confirm standard references before placing factory orders.
تطبيقات
- Machinery frames, guards, covers, and service panels
- Automotive, trailer, and general vehicle assemblies
- Conveyor systems, agricultural equipment, and vibration-prone structures
- Electrical cabinets, equipment brackets, and maintenance kits
- Distributor stock programs and factory assembly replenishment
ISO 7040 prevailing torque nuts are commonly paired with metric bolts and washers in vibration-prone assemblies. When matching parts are needed, XZ Fastener can also quote related flat washers and other industrial nuts for complete purchasing lists.
How to Get a Faster Quotation
To receive a faster quotation, send diameter, pitch, property class, material, finish, quantity per size, insert color or insert requirement, mating bolt grade, packing method, carton quantity, label format, and inspection document requirements. If the nuts are used in vibration-sensitive assemblies, include application notes and any torque testing requirement.
For non-standard thread, special insert request, buyer-specific packing, or combined bolt and nut sets, XZ Fastener’s customized service can review the inquiry according to drawing and order requirement. Buyers can contact XZ Fastener with a size list and quantity plan for factory quotation support.
أسئلة متكررة
What is an ISO 7040 prevailing torque nut?
It is a metric hexagon lock nut with a non-metallic insert that creates prevailing torque on the mating bolt thread. This helps resist loosening when the nut is correctly selected and installed.
Can ISO 7040 prevailing torque nuts be supplied in carbon steel?
Yes. Carbon steel options can be supplied in property classes such as 5, 8, and 10 according to size, finish, and order requirement.
Are stainless steel ISO 7040 nuts available?
Stainless steel options such as A2 and A4 can be reviewed upon request. Buyers should confirm corrosion requirements, insert material expectations, and packing details.
Can these nuts be reused?
Prevailing torque nuts may lose locking performance after repeated installation. Reuse should be evaluated according to the application, thread condition, and buyer inspection requirement.
Which finish is common for ISO 7040 lock nuts?
Zinc plated finish is common for carbon steel nuts. Black oxide, nickel plated, plain, and stainless passivated options can also be discussed according to application and order requirement.
What information should be sent for factory quotation?
Please send size, pitch, property class, material, finish, quantity, insert requirement, packing method, label requirement, mating bolt details, and inspection requirements.
Send Your ISO 7040 Prevailing Torque Nuts Inquiry
For a faster quotation, send your size list, finish, quantity, packaging, and inspection requirements. Please include material grade, property class, thread pitch, insert requirement, mating bolt details, carton quantity, label format, and any torque or inspection documents needed for factory review.
contact XZ Fastener