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IPC Subgroup
F16B 39/28

by special members on, or shape of, the nut or bolt

Introduced: September 1968

Last revised: January 2006

Full Title

Locking of screws, bolts, or nuts > in which the locking takes place during screwing down or tightening > by special members on, or shape of, the nut or bolt

Classification Context

Section:
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
Subclass:
DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING

Filing statistics

IPC F16B 39/28 belongs to the parent subclass F16B, which recorded 208,840 patent applications worldwide between 2013 and 2023. Annual filings grew from 13,033 in 2013 to 19,672 in 2023 (+51%), peaking at 25,970 applications in 2020. The most active applicants in class F16 are SCHAEFFLER TECHNOLOGIES & COMPANY (21,545 applications), ZAHNRADFABRIK FRIEDRICHSHAFEN (9,446 applications) and TOYOTA MOTOR CORPORATION (7,215 applications).

Source: EPO PATSTAT, worldwide filings

7 direct subcodes

Child Classifications

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  • F16B 39/282 Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
  • F16B 39/3 Locking exclusively by special shape of the screw-thread
  • F16B 39/32 Locking by means of a pawl or pawl-like tongue
  • F16B 39/34 Locking by deformable inserts or like parts
  • F16B 39/36 with conical locking parts, which may be split, including use of separate rings co-operating therewith
  • F16B 39/38 with a second part of the screw-thread which may be resiliently mounted

Top Applicants

Top 10 applicants by patent filingsfor class F16, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SCHAEFFLER TECHNOLOGIES & COMPANY DE 21,545
  2. ZAHNRADFABRIK FRIEDRICHSHAFEN DE 9,446
  3. TOYOTA MOTOR CORPORATION 7,215
  4. HYUNDAI MOTOR COMPANY KR 6,846
  5. ROBERT BOSCH DE 6,106
  6. NTN CORPORATION 5,305
  7. SKF SE 4,219
  8. KIA MOTORS CORPORATION KR 3,852
  9. NSK 3,850
  10. HONDA MOTOR COMPANY 3,639