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Pinnskruv DIN 939 i rostfritt A4-stål med metrisk gänga i båda ändar för säker mekanisk infästning.
Pinnskruv DIN 939 i rostfritt A4-stål med metrisk gänga i båda ändar för säker mekanisk infästning.
Pinnskruv DIN 939 i rostfritt A4-stål med metrisk gänga i båda ändar för säker mekanisk infästning.
Teknisk måttritning och dimensionstabell för pinnskruv DIN 939 i syrafast A4 rostfritt stål, storlek M6–M30.
Pinnskruv DIN 939 i rostfritt A4-stål med metrisk gänga i båda ändar för säker mekanisk infästning.
Pinnskruv DIN 939 i rostfritt A4-stål med metrisk gänga i båda ändar för säker mekanisk infästning.
Pinnskruv DIN 939 i rostfritt A4-stål med metrisk gänga i båda ändar för säker mekanisk infästning.
Teknisk måttritning och dimensionstabell för pinnskruv DIN 939 i syrafast A4 rostfritt stål, storlek M6–M30.

Stud bolt | A4 | DIN 939

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Description

Stud bolt A4 DIN 939, also referred to as a threaded stud or double-ended stud, in acid-proof stainless steel A4-70 (AISI 316), is intended for use in outdoor, industrial, and marine environments where a detachable threaded connection with fixed anchoring in a tapped hole is required. The product complies with DIN 939 with an insertion end of 1.25 x d and is used where a removable connection to housings, flanges, and machine parts is needed. It is suitable for professional installations where long service life and consistent performance are critical.

AREA OF APPLICATION

The stud bolt is used in mechanical engineering, flange joints, pumps, valve housings, the chemical industry, and marine installations. It is intended for applications where a threaded stud is screwed into a tapped hole, for example in cast iron or steel, and where the material selection provides the necessary protection against corrosion and mechanical stress. The acid-proof stud bolt is available in dimensions M6, M8, M10, M12, M16, M20, M24, and M30.

Watch video: Tightening torque for stainless steel screws

TECHNICAL SPECIFICATIONS

  • Product type: Screw
  • Product family: Stud bolt (threaded stud, double-ended stud)
  • Material class: A4 (AISI 316, acid-proof)
  • Strength class: A4-70
  • Standard: DIN 939
  • Thread dimension: M6–M30, metric thread
  • Design: Insertion end 1.25 x d, threaded at both ends
  • Environment: Marine / Outdoor
  • Delivery unit: Piece

FREQUENTLY ASKED QUESTIONS (FAQ)

What is a stud bolt and what does DIN 939 mean?

A stud bolt is a headless screw threaded at both ends. One end is screwed into a tapped hole, and the other end receives a nut. DIN 939 specifies stud bolts with an insertion end of approximately 1.25 times the thread diameter (1.25 x d), intended for materials such as cast iron.

What is the difference between DIN 938, DIN 939, and DIN 835?

The difference lies in the length of the insertion end. DIN 938 has 1.0 x d and is mainly used in steel, DIN 939 has 1.25 x d and is used in cast iron among other things, and DIN 835 has 2.0 x d and is used in softer materials like aluminum. Select the standard based on the material of the tapped hole.

How do I choose the correct length for the stud bolt?

The length (l) refers to the length of the stud bolt excluding the insertion end. Choose the length based on the material thickness of the parts being clamped together, as well as the height of the washer and nut, ensuring at least a couple of thread turns protrude above the nut.

Is A4 suitable for marine environments?

A4 (AISI 316) contains molybdenum and has better resistance to chlorides than A2, making the material suitable for coastal and marine environments. In constant contact with seawater or in stagnant, low-oxygen conditions, even A4 can be subject to crevice corrosion and should therefore be checked against the specific application.

What is the difference between A2 and A4?

A4 (AISI 316) contains molybdenum and tolerates chlorides better than A2 (AISI 304). Choose A4 for marine environments or chemical exposure, and A2 for general indoor and outdoor use. The A2 variant is available as Stud bolt A2 DIN 939.