S-91273A726 1"-8 Shoulder Screws

Shoulder Screws

0544FA00444 Shoulder Screws
0544FA00444 Shoulder Screws

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

Part No.
Part No. 0544FA00444
Equivalent to mcmaster :
91273A726

Basic Information

System of Measurement Inch

Head Parameters

Head Type Socket
Head Diameter 1 5/16"
Head Height 5/8"
Head Texture Knurled
Socket Head Profile Standard

Dimensions

Shoulder Diameter 1"
Shoulder Diameter Tolerance -0.004" to -0.002"
Shoulder Fit Standard
Shoulder Length 1"
Shoulder Length Tolerance -0.005" to 0.005"

Thread Parameters

Thread Type UNC
Thread Size 1"-8
Thread Diameter 1"
Thread Spacing Coarse
Thread Length 1"
Thread Direction Right Hand
Thread Fit Class 2A

Tip & Drive Parameters

Drive Style Hex
Drive Size 1/2"

Material & Strength

Material 18-8 Stainless Steel
Finish Black Oxide
Hardness Rockwell B55
Tensile Strength 70000 psi
Minimum Shear Strength 35000 psi

Temperature & Environment

REACH Compliant
RoHS Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Superior corrosion resistance with 18-8 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
  • Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
  • Precise alignment and smooth rotation ensured by the standard shoulder with controlled diameter and length tolerances.
  • Easy installation and removal with a 1/2" Hex Drive and knurled head for enhanced grip and torque application.
  • Wide compatibility with 1"-8 UNC coarse threads and Class 2A fit, facilitating quick assembly in various applications.
  • Enhanced durability from Rockwell B55 hardness, resisting wear and deformation over extended use.
  • Compliance with environmental standards, being RoHS 3 and REACH compliant for safe, sustainable use in global markets.

Professional Applications & Engineering Value

This 1"-8 UNC Shoulder Screw is engineered to address critical challenges in precision machinery and heavy-duty assemblies. Made from 18-8 Stainless Steel with a Black Oxide finish, it provides excellent corrosion resistance, reducing maintenance in moist or chemical-exposed settings. The coarse UNC threads and Class 2A fit ensure secure fastening with minimal risk of cross-threading, while the knurled head and 1/2" hex drive allow for efficient torque application in confined spaces. Ideal for applications like conveyor systems, automotive jigs, and robotic arms, this shoulder screw offers a robust shoulder for precise component positioning, preventing misalignment and extending equipment life in demanding industrial environments.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A fit for consistent dimensional accuracy, including shoulder diameter and length tolerances (e.g., diameter: -0.004" to -0.002"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances. Manufactured to meet high-performance criteria with a tensile strength of 70,000 psi and shear strength of 35,000 psi, it is suitable for rigorous industrial applications requiring reliability and safety.

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