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Written by G.L. Huyett Marketing Department on 04/12/2021 with 0 comments

Euro Grease Fittings Design Standards

The DIN standards are the most commonly accepted standards governing metric grease fittings. DIN stands for Deutsches Institut für Normung (German Institute for Standardization) and, much like SAE, their standards cover a wide variety of products including fasteners, keystock, pins, and more. DIN standards are often misunderstood in the United States due to unfamiliarity and the language barrier. Additionally, American practice is often integrated with DIN standards resulting in an informal, hybrid standard of DIN and SAE. For example: Metric threaded grease fittings might have DIN threads with SAE compliant nipple profiles, plating, and/or heat treatment. The purpose of this section is to familiarize the user with the basic aspects of the DIN standard, and to outline the most common domestic deviations.

Fitting Design

Fitting Design

Nipple Variations

DIN Standard head profiles are similar to SAE Standard profiles, except that DIN heads are machined from a sphere. However, standard couplers will lubricate both fitting styles.

Nipple Variations

Coupler Alignment

Nipples or heads are hardened to provide additional strength and to minimize wear from repeated contact with the jaws of a grease gun coupler during use.

Coupler Alignment

Contour of tip must allow coupler to seal within 50 degrees misalignment with axis of fitting.

Body Types

Body forms are specified by DIN 71412. Square and hex body forms are allowable on angled fittings, and these unique body forms may help users identify metric fittings. Standard, round body forms most common in the U.S. are often substituted with no impact on functionality.

Body Types

While cosmetically different, DIN body types perform the same as SAE fittings.

Thread Specification

  1. Metric Tapered Threads: ISO metric threads are the most widely used threads in the world. They share the 60° thread profile of NPT, but the shanks are metric sized. Metric threads are tapered unless otherwise noted.
  2. Whitworth Threads: The less common Whitworth form British thread is often considered to be metric. This is likely due to their non‑domestic origin.
Thread Specification

Tapered fittings are designed to mate in parallel threaded holes. Thread sealant is required for a leak‑free seal.

Euro Grease Fittings Manufacturing

Metric fittings that comply with DIN standard specifications are manufactured to the same high standard you expect of G.L. Huyett products. Metric fittings exceed inspection requirements of the DIN Standard.

Production

  1. Turned & Formed: Fittings are turned, threads are formed.
  2. Heat Treated: The nipple is hardened. Please note: Threads are also hardened on thread forming fittings.
  3. Plated: Zinc yellow plating is typically specified because of its added corrosion resistance as compared to zinc clear plating.
  4. Assembled: Ball check and spring along with any other critical pieces are inserted and the lip is rolled to secure internal parts.
  5. Optical Inspection: Inspection ensures that no part leaves the facility without a ball check.
Production

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