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Paulin® Papco® B078-902 Partial Threaded Hex Head Cap Screw, 1-1/4 in, 9 in L Under Head, 8 Grade, Medium Carbon Steel, Bare Metal



Paulin® Papco® Hex Head Cap Screw, Partial Threaded, Series: B078, Measurement System: Imperial, 1-1/4 in Thread, 9 in Length Under Head, 8 Grade, Medium Carbon Steel, Bare Metal, UNF Thread, 1-7/8 in W x 15/32 in H Head, Hex Head, 150000 psi Tensile Strength, Material Specification: ASME B18.2.1-1996, SAE J429, 3 in Minimum Thread Length, C33 to C39 Rockwell Hardness


Diameter - Thread Size 1-1/4 in
Finish Bare Metal
Grade 8
Hardness C33 to C39 Rockwell
Head Size 1-7/8 in W x 15/32 in H
Head Type Hex
Length Under Head 9 in
Material Medium Carbon Steel
Material Specification ASME B18.2.1-1996, SAE J429
Measurement System Imperial
Minimum Thread Length 3 in
Series B078
Tensile Strength 150000 psi
Thread Type UNF
Type Partial Threaded


  • 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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