Black Oxide 3/8-16 Nylon Insert Hex Lock Nut Stainless Locknuts

• Customization: Available
• Material: Carbon Steel, Stainless Steel, Alloy Steel
• Type: Hexagon Head
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, ANSI, GB, JIS, BSW
• Grade: 4/8/10/12
• Delivery: 5-10 Days in Stock, 10-30 Days Not in Stock
• Head Mark: Customized
• Thread Length: Lnternal Threads
• Size: M3-M100
• Transport Package: Plastic Bags+Cartons+Pallets
• Specification: as Request
• Trademark: LS or Customized
• Origin: Hebei, China
• HS Code: 731816
• Production Capacity: 50 Million Tons/Month
• Package Size: 24.40cm * 12.00cm * 12.00cm
• Package Gross Weight: 25.000kg

Product Description

PRODUCT PARAMETER

Nylon Lock Nuts

Nylon lock nuts (or nyloc nuts) are anti-loosening fasteners featuring a nylon insert molded into their threaded bore. When tightened onto a bolt, the nylon deforms to create sustained frictional resistance against the threads, preventing loosening from vibration, shock, or thermal expansion—eliminating the need for extra washers or adhesives.

Constructed with a metal body (zinc-plated carbon steel for cost-effectiveness, 304/316 stainless steel for corrosion resistance) and a heat-resistant nylon insert (typically PA66), they comply with standards like DIN 985 and ISO 10439, with sizes ranging from M4 to M24.

Key Applications:

Automotive: Secure engine components, chassis parts, and wheel hubs (resists road vibration).
Industrial Machinery: Fasten motor housings, gearboxes, and conveyor systems (endures cyclic loads).
Electronics: Attach server racks, instrument panels, and battery enclosures (supports miniaturized setups).
Furniture/DIY: Assemble heavy-duty shelves or outdoor fixtures (maintains tightness long-term).

Their reusable design and reliable anti-loosening performance make them a staple in vibration-prone and safety-critical installations.

Thread Spec		M3	M4	M5	M6	M8	M10	M12	(M14)
d
P	thread pitch	0.5	0.7	0.8	1	1.25	1.5	1.75	2
da	Max	3.45	4.6	5.75	6.75	8.75	10.8	13	15.1
	Min	3	4	5	6	8	10	12	14
dw	Min	4.57	5.88	6.88	8.88	11.63	14.63	16.63	19.64
e	Min	6.01	7.66	8.79	11.05	14.38	17.77	20.03	23.36
h	Max	4.5	6	6.8	8	9.5	11.9	14.9	17
	Min	4.02	5.52	6.22	7.42	8.92	11.2	14.2	15.9
m	Min	2.15	2.9	4.4	4.9	6.44	8.04	10.37	12.1
mw	Min	1.72	2.32	3.52	3.92	5.15	6.43	8.3	9.68
s	Max	5.5	7	8	10	13	16	18	21
	Min	5.32	6.78	7.78	9.78	12.73	15.73	17.73	20.67

Material	Corrosion Resistance	Temperature Resistance	Magnetic	Applications
Carbon Steel	Low	-20°C to 300°C (-4°F to 572°F)	Yes	General purpose, construction, indoor machinery, automotive.
Alloy Steel	Low to Medium	-50°C to 450°C (-58°F to 842°F)	Yes	High-strength & high-load applications: engines, heavy machinery, structural bolts.
SS304 Stainless Steel	Good	-196°C to 800°C (-321°F to 1472°F)	No	Food processing, kitchen equipment, chemical equipment, architectural fixtures.
SS316 Stainless Steel	Excellent	-196°C to 800°C (-321°F to 1472°F)	No	Marine environments, chemical processing, medical implants, coastal structures.
Brass	Good	-20°C to 200°C (-4°F to 392°F)	No	Electrical applications, plumbing and pipe fittings, decorative purposes.
Aluminum Alloy	Good	-200°C to 150°C (-328°F to 302°F)	No	Lightweight applications: aerospace, racing, drones, bicycles.
Titanium Alloy	Excellent	-200°C to 600°C (-328°F to 1112°F)	No	High-end aerospace, medical implants, performance racing, chemical industry.
Nylon (Plastic)	Excellent	-40°C to 85°C (-40°F to 185°F)	No	Electrical insulation, lightweight fastening, chemical resistance, electronics.

ABOUT US

LONGSHI FASTENERS MANUFACTURING CO.,LTD.,

Longshi Fastener Manufacturing Co., Ltd., founded in 2008, is located in Shahe City, Hebei Province, close to the country's largestLarge fastener industrial cluster - Yongnian standard parts Industrial Park. The company headquarters covers an area of 21 thousand square meters, the annual output value of 200 million yuan, with more than 200 employees, with domestic More than 100 sets of advanced production equipment. It is a "manufacturing + service" type enterprise integrating fastener production, intelligent warehousing and e-commerce sales. The company's construction of the sea screw e-commerce park is located in Yongnian District, Handan City, Hebei Province, covers an area of 45 acres, the park planning and construction of office area, production area, packaging area, storage area, etc., to provide fastener production, packaging, warehousing, e-commerce sales and other services. Longshi mainly produces high quality and high strength fasteners, and "Longshi" screws have become a well-known brand in the industry. Longshi always adhere to quality first, reputation first. From raw material procurement, design and development, production and processing to products strict quality control is implemented in every link of quality testing and sales to win the recognition of our customers. The company has established standardized product testing laboratories and quality testing processes and standards to ensure that products strictly comply with national standards.

FAQ

Q1: What is your minimum order quantity (MOQ)? Do you charge extra for small orders?
100 pieces MOQ (most peers require 1,000+), no price premium for small orders. First-time customers for cross-border e-commerce/trade get free samples.
Q2:Do you support custom orders? How long does the customization process take?
Longshi Advantage: 8-dimensional customization (material, specification, surface treatment, etc.), with 3D design drawings + process plans.
Q3: What if an item is out of stock?
Stockout rate <0.1% (peers: 10+%), with real-time inventory monitoring. For extreme stockouts, free upgraded alternatives are provided (peers often leave clients waiting indefinitely).
Q4: Do you provide technical support, such as installation guidance or drawing optimization?
Dedicated 1v1 engineer team offering free technical support.
Q5:Can I visit your factory or arrange a factory audit?
Support online factory tours (real-time video of production lines/laboratories) and offline visits (pick-up service available).