Product
A.P. LOCK
(Keyless Bushing)

A.P. Lock (Keyless Bushing) is a power transmission component that
enables to clamp shaft and hubs (i.e. pulley, gear etc.) simultaneously
through its surface pressure. S.I.M provides diverse options in regards
to size, body material and surface treatment.

  • INDEX (A.P.LOCK)
  • Selection and Design Guide
  • HOW TO INSTALL
    (SAPL-A, B,C, D1, D2, D3, D4, T Series)
  • HOW TO INSTALL (SAPL-R)
  • HOW TO INSTALL (SAPC, SAPA)

HOW TO INSTALL (SAPL-R)

Design of Pressure Flange

In general, SAPL-R series is supposed to be used along with pressure flanges whose design varies according to user’s shaft/hub design. Please refer to the below design variables.

Location of screws (locking bolts) on the pressure flange (F)
  1. Case1: Pressure flange mounted on Hub
    F = D + 12 + db (screw size)
  2. Case2: Pressure flange mounted on Shaft
    F = D – 12 - db (screw size)
Thickness of pressure flange (P)
  1. Case1: Fastened with Grade 8.8 class screw
    P = 1.3 x db (screw size)
  2. Case2: Fastened with Grade 12.9 class screw
    P = 1.8 x db (screw size)
If more than 2pcs of SAPL-R are mounted simultaneously

- Distance(W) between pressure flange and hub/shaft has to be adjusted. Please refer to “Dimensions / Performance” pages for (W) values.

Transmissible Torque Calculation (Formula)
TC=Ptotal-Ppre-load0.54×0.12×d2000
Screw Size
(db)
Pressure on each screw (Pb [N])
Grade 8.8 class Grade 10.9 class Grade 12.9 class
M4 3900 5450 6550
M5 6350 8950 10700
M6 9000 12600 15100
M8 16500 23200 27900
M10 26200 36900 44300
M12 38300 54000 64500
If more than 2pcs of SAPL-R are mounted simultaneously, the clamping force on shaft (permissible torque) becomes higher.
  • SAPL-R/ 1pc mounted: Tc (Max. Permissible Torque)
  • SAPL-R/ 2pcs mounted: Tc (Max. Permissible Torque) x 1.55
  • SAPL-R/ 3pcs mounted: Tc (Max. Permissible Torque) x 1.85
  • SAPL-R/ 4pcs mounted: Tc (Max. Permissible Torque) x 2.02