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Paulin® Papco® 078-597 Partial Threaded Hex Head Cap Screw, 1/2 in, 5-1/2 in L Under Head, 8 Grade, Medium Carbon Steel, Bare Metal

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Description

Paulin® Papco® Hex Head Cap Screw, Partial Threaded, Series: 078, Measurement System: Imperial, 1/2 in Thread, 5-1/2 in Length Under Head, 8 Grade, Medium Carbon Steel, Bare Metal, UNF Thread, 3/4 in W x 5/16 in H Head, Hex Head, 150000 psi Tensile Strength, Material Specification: ASME B18.2.1-1996, SAE J429, 1-1/4 in Minimum Thread Length, C33 to C39 Rockwell Hardness

Hex Head Cap Screws are used to secure an object within or against another object. They are recognized with specific features like tighter tolerances and a chamfered end with a washer face under the head. The bare metal finish (non-plated) is ideal for indoor use or where corrosion is not a concern. Grade 8 screws, recognized by six radial bars, are made from quenched and double heat-treated medium carbon alloy steel for maximum strength in demanding applications like heavy-duty machinery.

Specifications

Diameter - Thread Size 1/2 in
Finish Bare Metal
Grade 8
Hardness C33 to C39 Rockwell
Head Size 3/4 in W x 5/16 in H
Head Type Hex
Length Under Head 5-1/2 in
Material Medium Carbon Steel
Material Specification ASME B18.2.1-1996, SAE J429
Measurement System Imperial
Minimum Thread Length 1-1/4 in
Series 078
Tensile Strength 150000 psi
Thread Type UNF
Type Partial Threaded

Features

  • Papco® grade 8 cap screws, identified by the six radial bar head marking, are made of medium carbon alloy steel, quenched and tempered for stronger, safer, more reliable mechanical joints
  • Six radial bars
  • Double heat treated
  • Use with grade 8 nuts to develop the full strength of the cap screw
  • Medium carbon steel quenched and tempered C: 0.25 to 0.55, P: 0.025 maximum, S: 0.025 maximum
  • For studs only, sulfur content may be 0.13% maximum
  • There shall be a sufficient hardenability to ensure a microstructure consisting of approximately 90% martensite in the core of threaded sections of the fasteners after hardening and quenching and before tempering

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