Hex Slotted Nut (Castellated) – Locking Cotter Pin, M3–M42
Usage scenarios (3 sentences):
They are used where safety and positive locking are critical, for example on wheel hubs, axle nuts, and steering or suspension joints in vehicles. They also secure gears, pulleys, clevis pins, and shaft-mounted parts in industrial machinery that faces vibration or shock. Common in agricultural, construction, and marine equipment, castellated nuts with cotter pins are chosen where a simple, visible mechanical lock and corrosion-resistant options are needed.
Product advantages
The Hex slotted (castellated) nut paired with a locking cotter pin, available in sizes M3–M42, is precision-cast and heat-treated to ensure consistent thread engagement and reliable mechanical performance for industrial, automotive, and machinery assemblies. Its castellated profile accepts a cotter pin through the nut and shaft to provide a positive mechanical lock that resists vibration-induced loosening while enabling quick visual inspection and straightforward maintenance. Key advantages include wide size coverage, high tensile and shear capacity, corrosion-resistant finish options, standardized thread compatibility, and simple, low-cost installation for secure retention in critical joints.
Team strength
Our team combines precision engineering and quality-driven manufacturing to deliver hex slotted (castellated) nuts with locking cotter pins across M3–M42. Core strengths include material expertise (steel, stainless, brass), tight tolerances, and controlled finishes for consistent fit and corrosion resistance. Cross-functional collaboration—R&D, production, QA, and logistics—ensures scalable volumes, fast lead times, and full traceability. Value comes from reliable locking performance, enhanced safety, and reduced rework in assembly. Technical support and bespoke sizing or surface treatments are available to match application requirements. The result: a dependable supply partner that prioritizes product integrity, on-time delivery, and long-term performance, with cost-effective solutions and innovation.
Enterprise core strength
Our experienced engineering and production team ensures every Hex Slotted (Castellated) Nut and matching locking cotter pin, available in M3–M42, meets strict quality and performance standards. Cross-functional expertise in materials, machining, and assembly enables precise tolerances, consistent slot geometry, and secure locking performance. Dedicated quality control, testing protocols, and traceability guarantee safety and long-term reliability in critical fastening applications. Responsive technical support and customizable supply options speed product selection and deployment for OEMs and maintenance teams. Combined manufacturing capacity and supply-chain coordination deliver consistent volume, on-time delivery, and competitive value for clients across industries, backed by continuous improvement and innovation.
Slotted nuts, also known as slotted hex nuts, have opposing slots cut into the end of the opposite side of the bearing surface. Slots are used for the insertion of a safety wire or cotter pin, creating a secure hold that prevents loosening or unscrewing
1.Standard: ASME/ANSI B18.2.2; DIN935
2. Size: 1/4''–1-1/2’’; M3 – M42
3. Material: Carbon Steel, Alloy Steel, Stainless Steel, Brass
4. Grade: SAE J995 Gr.2, 5,8; CL4, 5, 6, 8, 10, 12
5. Thread: M, UNC, UNF
6. Finish: Plain,ZincPlated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G.
7. Packing: bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand
8. Application: Structural Steel; Metal Buliding; Oil&Gas; Tower&Pole; Wind Energy; Mechanical Machine; Automobile: Home Decorating
9. Test Equipments: Caliper,Go&No-go gauge,Tensile test machine,Hardness tester,Salt spraying tester, H.D.G. thickness tester, 3D detector,Projector,Magnetic flaw detecter
10. Supply Ability: 1000 tons per month
11. MinimumOrde: 100kgs for each specification
12. Trade Term: FOB/CIF/CFR/CNF/EXW/DDU/DDP
13. Payment Term: T/T, L/C , D/A , D/P, etc
14. Market: South&north Amrica/Europe/East&South east Asia/ Australia and ect.
xarella.huang@jm-fastener.comSince our establishment in 2006, JM has been adhering to the mission of creating maximum value for customers by providing differentiated services, and making a positive contribution to the society.