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China factory - Dongguan Situo Hardware Products Technology Co., Ltd

Dongguan Situo Hardware Products Technology Co., Ltd

  • China,Dongguan ,Guangdong
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  3. Stainless steel square nut through-hole precision parts are used in the
China Stainless steel square nut through-hole precision parts are used in the
China Stainless steel square nut through-hole precision parts are used in the

  1. China Stainless steel square nut through-hole precision parts are used in the
  2. China Stainless steel square nut through-hole precision parts are used in the
  3. China Stainless steel square nut through-hole precision parts are used in the
  4. China Stainless steel square nut through-hole precision parts are used in the
  5. China Stainless steel square nut through-hole precision parts are used in the

Stainless steel square nut through-hole precision parts are used in the

  1. MOQ： 1PCS
  2. Price： 5-10 USD per item
  3. Get Latest Price
durability High
Sizerange Various sizes available
origin china
Corrosionresistance High
Material stainless steel
Precision Min0.001
Application Marine and Shipbuilding
Processing technology CNC turning
Weight lightweight
Surface treatment Passivation
Sample period 10 to 15 days
Category Square nut
Productname Ships Hardware
size 1.0-60.0mm
head shape Square
usage ship
Payment Terms T/T
Supply Ability 10000PCS per day
Delivery Time Communication
Packaging Details Communication
Brand Name SITUO
Model Number ST-120005
Certification ISO9001 & TS16949
Place of Origin GuangDong Dongguan

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  1. Product Details
  2. Company Details

Product Specification

durability High Sizerange Various sizes available
origin china Corrosionresistance High
Material stainless steel Precision Min0.001
Application Marine and Shipbuilding Processing technology CNC turning
Weight lightweight Surface treatment Passivation
Sample period 10 to 15 days Category Square nut
Productname Ships Hardware size 1.0-60.0mm
head shape Square usage ship
Payment Terms T/T Supply Ability 10000PCS per day
Delivery Time Communication Packaging Details Communication
Brand Name SITUO Model Number ST-120005
Certification ISO9001 & TS16949 Place of Origin GuangDong Dongguan
High Light square ships hardware ，square connection screws ，stainless steel ships hardware
Stainless Steel Square Nut Through-Hole Precision Parts for Shipbuilding Industry
Stainless steel square nut through-hole precision parts are specifically designed for demanding applications in the shipbuilding industry, offering superior performance in high-vibration, corrosive marine environments.
Application Scenarios in Shipbuilding
Square nuts are essential components in shipbuilding due to their ability to withstand high vibration, strong corrosion, heavy loads, and limited space constraints.
  • Deck & Hull Structure Connection: Fastening for hatch covers, railings, walkway gratings, and mooring equipment bases, designed to resist wave impact and hull deformation.
  • Piping & Valve Fixing: Connection of flanges and supports for seawater, fuel, hydraulic, and steam pipelines using A4-80 stainless steel to resist chloride ion corrosion.
  • Equipment & Base Installation: Fixed installation for main engines, auxiliary engines, pumps, and generators where the square structure prevents rotation and resists high-frequency vibration.
  • Special Areas: Applications in ballast tanks, sewage tanks, and open decks using 316L/A4-80 stainless steel meeting NORSOK M-001 HIC resistance requirements.
Core Characteristics
Structural & Mechanical Advantages
  • Anti-loosening & anti-vibration: Square shape restricts rotation, more stable than hex nuts under vibration
  • High torque efficiency: Four flat surfaces bear force evenly, not easy to slip
  • Easy assembly: Operated with a single wrench, suitable for blind assembly and narrow spaces
  • Large contact area: Reduces local stress and avoids crushing connected parts
Material & Corrosion Resistance
Common materials include carbon steel (Grade 8/10), stainless steel (A2-70, A4-80), copper alloy, and duplex steel with surface treatments including passivation, hot-dip galvanizing, and PTFE coating.
Standards & Certifications
Compliant with GB/T 39, DIN 557, ISO 7040, DIN 928 (welded type) standards and certified by DNV-GL, ABS, LR, BV classification societies.
Processing Difficulties of Non-Standard Square Nuts
Non-standard square nuts refer to customized parts with specialized dimensions, structures, materials, and strict tolerances, representing technical challenges in precision shipbuilding.
Design & Process Challenges
  • No unified standards requiring 3D modeling, special tooling, and process debugging
  • Complex structures: flange, step, positioning hole, welding boss requiring multi-process machining
  • Difficult-to-machine materials: A4-80, duplex steel, titanium alloy, high-temperature alloy
  • Small-batch customized production with frequent model changes, low efficiency, and high cost
Precision Control Challenges
  • Dimensional tolerance: width across flats ±0.02 mm, thickness ±0.01 mm, thread accuracy 6H/6G
  • Geometric tolerance: flatness ≤0.005 mm, perpendicularity ≤0.01 mm, symmetry ≤0.01 mm
  • Thread precision: profile half-angle ±15′, pitch diameter ±0.008 mm with 100% inspection
  • Surface roughness: Ra ≤0.8 μm, burr-free and scratch-free requirements
Machining Process Challenges
  • Clamping deformation: thin-walled and special-shaped parts require special fixtures
  • Tool wear: high-strength materials shorten tool life and cause dimensional drift
  • Thermal deformation: requires constant temperature processing and micro-lubrication
  • Residual stress: stress relief and aging treatment to avoid deformation
Standard vs Non-Standard Square Nuts Comparison
Item Standard Square Nut Marine Non-Standard Square Nut Processing Difficulty
Dimensional tolerance ±0.05~0.1 mm ±0.01~0.02 mm Micron-level control
Geometric tolerance IT8~IT10 IT5~IT6 Symmetry, perpendicularity ≤0.01 mm
Thread accuracy 7H 6H Full-profile inspection
Surface roughness Ra 3.2~1.6 μm Ra 0.4~0.8 μm Mirror-finish required
Material Carbon steel / 304 A4-80 / duplex steel / titanium High tool wear
Structure Simple square Flange / step / hole / boss Complex tooling
Certification None DNV / ABS / BV Third-party witness
Key Points for Precision Control
  • Process route: rough machining → stress relief → semi-finishing → finishing → threading → surface treatment → inspection
  • Customized elastic/positioning fixtures to reduce clamping deformation
  • High-rigidity CNC, precision thread grinding and jig grinding machines
  • Carbide coated tools, optimized parameters and micro-lubrication
  • Full inspection by CMM, thread profilometer and classification society witness
  • Constant-temperature workshop, online compensation and full-process data traceability
We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs. Our maximum processing outer diameter is 60mm, and the minimum control tolerance is 0.001mm.
Our equipment portfolio includes Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, enabling us to provide optimal technical solutions.
Our company employs 300 personnel, including 20 technicians, 10 engineers, and 15 quality control specialists, operating over 300 pieces of equipment. We implement 8S management and maintain ISO9001 and TS16949 automotive certifications.
Notable customers include bo-sch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.
Our Manufacturing Capacity
Main Products: Stainless steel screws, carbon steel screws, pins, rivets, nuts, eccentric nails, embedded parts, and other fasteners.
Business Type: Factory / Manufacturer
Services: CNC Machining, Turning and Milling, CNC Turning, Cold heading, Stamping, Assembly Service
Materials:
  • Aluminum: AL 6061-T6, 6063, 7075-T etc
  • Stainless steel: 303, 304, 304L, 316L, 316F, 630, 410, 420, 430, etc
  • Steel: 4140, Q235, Q345B, 20#, 45#, 1215, 12L14, 1144, 1006, 1008, 1010, 1015, 1018, 10B21, 1035, 1065 etc
  • Alloy steel: 5140, 4135, 4140, 3435, 5120, 415, 435, 440 etc
  • Titanium: TA1, TA2/GR2, TA4/GR5, TC4, TC18 etc
  • Brass: C36000 (HPb62), C37700 (HPb59), C26800 (H68), C22000(H90), C27000, C51900, C11000, C3604, H62, H65 etc
  • Copper, bronze, Magnesium alloy, Delrin, POM, Acrylic, PC, etc
Finishing: Sandblasting, Anodize color, Blackening, Zinc/Nickel Plating, Polish, Power coating, Passivation PVD, Titanium Plating, Electrogalvanizing, electroplating chromium, electrophoresis, QPQ, Electro Polishing, Chrome Plating, Knurl, Laser etch Logo, etc.
Drawing Formats: STEP, STP, GIS, CAD, PDF, DWG, DXF etc or samples
Tolerance: +/-0.01mm ~ +/-0.05mm
Surface Roughness: Ra 0.1~3.2
Inspection: Complete inspection lab with Micrometer, Optical Comparator, Caliper Vernier, CMM, Depth Caliper Vernier, Universal Protractor, Clock Gauge, Internal Centigrade Gauge
Precision stainless steel square nut for shipbuilding applications Marine-grade square nut through-hole precision part Custom non-standard square nut with specialized dimensions High-precision square nut manufacturing process Stainless steel square nut quality inspection Shipbuilding industry square nut applications Precision machined square nut components Custom square nut with complex structural features Marine corrosion-resistant square nut High-torque efficiency square nut design Specialized square nut for equipment installation Quality controlled square nut manufacturing

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer,Seller

  • Year Established:

    2019

  • Total Annual:

    2800000-3500000

  • Employee Number:

    50~100

  • Ecer Certification：

    Verified Supplier

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  • Dongguan Situo Hardware Products Technology Co., Ltd
  • No. 9, Shi bi One Alley, Zhangmutou Town, Dongguan City, Guangdong Province
  • https://www.cnc-hardwareparts.com/

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