S-3638N131 M12 x 25 mm DIN 561B Set Screws

Set Screws

0663FA00019 Set Screws
0663FA00019 Set Screws

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

Part No.
Part No. 0663FA00019
Equivalent to mcmaster :
3638N131

Basic Information

System of Measurement Metric

Head Parameters

Head Type Hex
Head Width 16 mm
Head Height 9 mm

Dimensions

Length 25 mm

Thread Parameters

Thread Type Metric
Thread Size M12
Thread Pitch 1.75 mm
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 6g

Tip & Drive Parameters

Tip Type Extended
Tip Length 6 mm
Tip Length Tolerance 0 to 0.3mm
Tip Diameter 8.5 mm
Tip Diameter Tolerance -0.22mm to 0
Drive Style External Hex

Material & Strength

Material Steel
Hardness Rockwell C20
Fastener Strength Grade/Class Class 8.8

Temperature & Environment

REACH Compliant
RoHS Compliant
Specifications Met DIN 561B
Technical Drawings No drawings available at the moment, will be launched soon
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Key Features & Benefits at a Glance

  • Superior torque transmission with external hex drive design for reliable installation in high-torque applications
  • Exceptional mechanical strength with Class 8.8 steel construction, ensuring reliable performance under heavy loads
  • Precision extended tip design provides secure positioning and prevents component slippage during operation
  • Optimized coarse threading (M12 x 1.75mm) enables faster installation and superior holding power in various materials
  • Industry-standard compliance with DIN 561B specifications guarantees consistent quality and interchangeability
  • Enhanced durability with Rockwell C20 hardness rating, resisting wear and deformation in demanding environments
  • Environmental compliance assurance with RoHS 3 and REACH certification for safe use in regulated industries

Professional Applications & Engineering Value

This high-strength Class 8.8 steel hex set screw delivers exceptional engineering value in industrial applications where secure fastening and vibration resistance are critical. The M12 coarse thread with 1.75mm pitch provides excellent grip in both metallic and non-metallic materials, while the extended tip design ensures positive location and prevents rotational slippage in pulley systems, gear assemblies, and coupling applications. The external hex drive configuration allows for high torque application using standard tools, making it ideal for maintenance operations and production line assembly. Manufactured to DIN 561B standards with precise Class 6g thread fit, this fastener maintains dimensional accuracy across batch productions, reducing installation time and improving assembly reliability in automotive, machinery, and equipment manufacturing sectors.

Specification Summary & Compliance

This metric set screw features M12 x 1.75mm coarse threading with Class 6g thread fit tolerance ensuring precise engagement. The 25mm length with extended tip (6mm tip length, 8.5mm diameter) provides secure component positioning. Manufactured from Class 8.8 steel with Rockwell C20 hardness for consistent mechanical properties. Full compliance with DIN 561B specifications, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) regulations for hazardous substance restrictions.

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