S-91297A585 5/16"-18 x 1 1/2" Plastic Hex Head Screws

Plastic Hex Head Screws

0251FA00040 Plastic Hex Head Screws
0251FA00040 Plastic Hex Head Screws

Image may differ from product. See technical specification for details.

Part No.
Part No. 0251FA00040
Equivalent to mcmaster :
91297A585

Basic Information

Color White
System of Measurement Inch

Head Parameters

Head Type Hex
Head Width 1/2"
Head Height 15/64"

Dimensions

Length 1 1/2"

Thread Parameters

Thread Type UNC
Thread Size 5/16"-18
Thread Diameter 0.3125"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded

Tip & Drive Parameters

Drive Style External Hex

Material & Strength

Material PTFE Plastic
Hardness Not Rated

Temperature & Environment

Temperature Range -100° to 500° F
REACH Compliant
RoHS Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
Price available upon request. Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
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Key Features & Benefits at a Glance

  • Exceptional temperature performance for reliable operation in environments ranging from -100°F to 500°F
  • Superior chemical resistance thanks to PTFE plastic construction, ideal for corrosive industrial settings
  • Optimized torque transmission through the external hex drive design for secure fastening applications
  • Quick installation and reliable engagement with UNC coarse threading that resists cross-threading
  • Precise thread fit consistency with Class 2A tolerance ensuring smooth assembly and interchangeability
  • Full-length threading provides maximum grip and load distribution across the entire fastener length
  • Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for demanding environments, these PTFE plastic hex head screws deliver critical performance where metal fasteners fail. The PTFE material provides inherent corrosion resistance against chemicals, solvents, and moisture, eliminating galvanic corrosion risks in mixed-material assemblies. With operational capabilities from cryogenic conditions to high-temperature processes, these screws maintain dimensional stability where thermal expansion would compromise metal fasteners. The UNC coarse thread design ensures rapid installation in plastic and soft materials while the external hex drive accommodates standard tools for high-torque applications. Ideal for chemical processing equipment, food machinery, electrical enclosures, and laboratory instruments requiring non-conductive, non-corrosive fastening solutions.

Specification Summary & Compliance

This 5/16"-18 x 1-1/2" plastic hex head screw features UNC coarse threading manufactured to Class 2A thread fit standards, ensuring precise dimensional accuracy and interchangeability. The fastener is fully threaded along its entire 1-1/2" length and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to strict environmental and safety standards for industrial components.

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