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Better Fastener Industry Co., Ltd. is a Hexagon Slotted Nuts manufacturer in China producing castellated nuts with radial slots machined into the top face. A cotter pin passes through the slot and a cross-drilled bolt shank, creating a positive mechanical lock that holds the joint even under continuous vibration or load cycling.
Our nut range covers metric and imperial threads in carbon steel and stainless steel, supplied alongside Hexagon Head Bolts and matching washers so that a safety-critical connection arrives as one coordinated fastener set.
Where Hexagon Slotted Nuts Are Specified
Slotted nuts are chosen where rotational loosening is unacceptable and the joint must be visibly secured. Because the pin is a mechanical stop rather than a friction device, the lock does not depend on preload retention alone, and a technician can confirm correct assembly by sight.
- Steering and suspension joints — track rod ends, ball joints and linkage pins on vehicles and trailers.
- Construction and mining machinery — pivot pins, bucket linkages and articulation points on excavators and loaders.
- Agricultural equipment — implement hitches, plough and harrow linkages exposed to shock loading.
- Rail and heavy transport — brake rigging, coupler and bogie connections requiring periodic inspection.
- Marine and outdoor structures — stainless grades for clevis pins, rigging and deck hardware.
Our Hexagon Slotted Nut Range
We produce the standard slotted and castellated forms in coarse and fine metric pitches, plus thin variants for jam-nut and lock-nut positions where axial height is limited. Each item is made to a named standard so that thread form, across-flats and slot geometry are defined before production starts.
| Product | Standard | Typical Use |
|---|---|---|
| Metric hexagon slotted nut, coarse and fine thread | DIN 935-1:2013 | General machinery, vehicle linkage, pinned joints |
| Inch hexagon slotted nut | ASME/ANSI B18.2.2 (T5):2010 | North American equipment, replacement and OEM parts |
| Hexagon slotted thin nut | DIN 979:2013 | Jam-nut and lock-nut positions with limited height |
Materials are selected against the working environment: carbon steel for strength-driven joints, stainless steel where corrosion resistance or wash-down exposure governs. Zinc plating covers standard outdoor and mechanical conditions, and we confirm the coating system against the intended service life before quoting.
Slot, Pin and Bolt Shank Compatibility
A slotted nut only performs as intended when the slot, the pin and the bolt hole align. We treat these as one assembly problem rather than three separate parts.
- Slot width and depth must accept the specified cotter pin diameter without binding or excessive clearance.
- Bolt shank hole position determines how much of the slot is exposed once the nut is torqued; the hole is normally cross-drilled through the shank.
- Nut height and thread length must leave enough engaged thread for the pin to sit fully inside the slot.
- Pin material — stainless pins for stainless nuts to avoid galvanic mismatch in wet or marine service.
When a customer supplies the mating bolt drawing, we check slot-to-hole alignment and flag any conflict between the specified nut height and the drilled hole position before manufacturing.
Materials, Threads and Surface Treatment
Carbon Steel
Standard strength grades for machinery, transport and structural joints. Available with zinc plating for general corrosion protection.
Stainless Steel
For outdoor, marine and wash-down applications where the nut must resist corrosion without a coating.
Thread Systems
Coarse and fine metric pitches plus inch series, matched to the mating bolt thread class.
Post-treatment options include zinc plating and blackening, and we handle components of different shapes, sizes and materials within the same order. Where a drawing specifies a property class or a corrosion test, we confirm the achievable route before committing to production.
Quality Control and Acceptance
Our laboratory is equipped with a spectrometer, coordinate measuring machine and X-ray flaw detector, covering chemical composition, mechanical properties, non-destructive testing and geometric dimensions. Inspection is carried out after each production process, and finished products undergo final inspection against customer requirements and international standards.
- Thread gauging for pitch diameter and functional fit
- Across-flats and nut height measurement
- Slot width, depth and symmetry checks
- Hardness and, where required, proof load testing
- Coating thickness verification on plated parts
Inspection records and material certificates are prepared with the shipment so that incoming inspection at your plant can be matched against the production data.
Custom and Drawing-Based Production
Customized production is our core business. We develop and manufacture hexagon slotted nuts from drawings or physical samples, including non-standard across-flats, extended heights, special slot configurations and specific material grades. Our engineering team reviews the drawing for thread, slot and pin compatibility before tooling is set.
Standard parts remain available alongside custom work, so a project can combine catalogue slotted nuts with bespoke items in a single supply program. Related fasteners such as Hexagon Nuts and Washers can be consolidated into the same order to reduce separate handling.
Information We Use to Configure Your Solution
To prepare an accurate configuration and quotation for Hexagon Slotted Nuts, we work from the following project inputs. Where a detail is not yet fixed, we propose a workable option and confirm it with you.
| Input | What We Need | Why It Matters |
|---|---|---|
| Thread and standard | DIN 935-1, DIN 979, ASME/ANSI B18.2.2 or drawing | Fixes thread form, across-flats and slot geometry |
| Size and pitch | Nominal diameter, coarse or fine pitch | Determines tooling and mating bolt match |
| Material and grade | Carbon steel or stainless, property class | Sets strength and corrosion performance |
| Surface finish | Plain, zinc plated, blackened or stainless | Matches the service environment |
| Mating bolt | Shank hole position and pin diameter | Confirms slot-to-pin alignment |
| Quantity and packaging | Annual volume, batch size, carton or kit format | Drives production planning and packing |
Packaging, Delivery and Serviceability
We consolidate fasteners into retail kits, blister packs, custom boxes and export cartons, and we ship from a location within a short drive of Shanghai and Ningbo ports. Sea freight is the standard mode, with air freight arranged for urgent requirements.
For maintenance planning, slotted nuts are removed and refitted with a new cotter pin; the nut itself is normally reusable if the threads and slot are undamaged. We keep production records for repeat orders so that replacement batches match the original specification, and spare parts can be scheduled alongside new project volumes.
Frequently Asked Questions
Do you manufacture hexagon slotted nuts to both metric and inch standards?
Yes. We produce metric hexagon slotted nuts to DIN 935-1:2013 in coarse and fine thread, thin slotted nuts to DIN 979:2013, and inch series nuts to ASME/ANSI B18.2.2 (T5):2010. The standard is confirmed at quotation stage so that thread form and slot dimensions are fixed before production.
Which materials and coatings are available?
Carbon steel and stainless steel are our standard materials, with zinc plating and blackening among the post-treatment options. Stainless grades are used where the joint is exposed to moisture, marine conditions or frequent wash-down, and we confirm the finish against the intended service environment.
Can you produce slotted nuts from our drawing or sample?
Customized production is our core business. We develop and manufacture from drawings or physical samples, including non-standard across-flats, extended heights and specific slot configurations. Our engineering team reviews the drawing for thread, slot and cotter pin compatibility before tooling is prepared.
How is quality verified before shipment?
Inspection is performed after each production process, and finished products undergo final inspection against customer requirements and international standards. Our laboratory uses a spectrometer, coordinate measuring machine and X-ray flaw detector to monitor chemical composition, mechanical properties, non-destructive testing and geometric dimensions.
Can slotted nuts be supplied together with the mating bolts and washers?
Yes. We consolidate bolts, nuts and washers into one specification-led supply program. Slotted nuts are commonly paired with Hexagon Head Bolts and plain washers, and we check slot-to-shank-hole alignment when the mating bolt drawing is provided.
What packaging and shipping options do you offer?
We supply retail kits, blister packs, custom boxes and export cartons, and we are located close to Shanghai and Ningbo ports for efficient sea freight. Air freight can be arranged through Ningbo or Shanghai airports when delivery timing requires it.
