Product Name : SEMS SCREW
Product Introduction
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW
katsuhanan-SEMS(TAPPING)_SCREW

SEMS(TAPPING) SCREW :

SEMS combines two normally seperate parts-typically a screw and a washer- into one permanently pre-assembled cost saving component. Washers are hel in place under the screw head by the rolled threads; they will not fall off and are free to rotate.

ADVANTAGES :

  • SPEEDS: PRODUCTION BY ELIMINATING HARND ASSEMBLY AT THE WORK STATION
  • PERMANENT : CAPTURING OF WASHER INSURES THAT IT WILL NEVER COME OFF OR BE LEFT OFF YOUR ASSEMBLY
  • ADAPTS EASILY TO AUTOMATED FEEDING DEVICES AND DRIVING TOOLS
  • AVAILABE IN ANY COMBINATION OF SCREW TYPE, HEAD STYLE, WASHER AND THREAD CONFIGURATION
  • PRODUCTION RANGE : M2.5 ( #2) ~ M 12 ~ (1/2" . LENGTH : 4mm (5/32" ) ~ 160mm (6")
  • ISO 9001 CERTIFICATED MANUFACTURER & EXPORTER*
katsuhanan-set-4
katsuhanan-set-4

Screw and washer assemblies-SEMS, DIN6900

  • Included in these specifications are SEMS comprised of the following types of screws and washers :
  • (a) Helical Spring Lock Washers.
  • (b) Tooth Lock Washers
  • (c) Conical Spring Washers
  • (d) Plain Washers
  • (e) By the purchaser’s drawing or standard

Screw and washer assemblies

  • Coarse threaded Screws with captive plain washer
  • DIN6900
  • Examples of screw and washer assemblies
katsuhanan-6900-1

Figure 1. Assembly with screw threaded approximately up to the head.

katsuhanan-6900-1-1

Figure 2. Assembly with screw unthreaded portion of shank.

Screw and washer assemblies

  • Coarse threaded Screws with captive curved spring lock washer
  • DIN6900
  • Examples of screw and washer assemblies
  • Table 1. DIMENSIONS
katsuhanan-SEMS(TAPPING)_SCREW

Figure 1. Assembly with screw threaded approximately up to the head.

katsuhanan-SEMS(TAPPING)_SCREW

Figure 2. Assembly with screw unthreaded portion of shank.

Thread size
(d)
a / 2" Washer dimensions
DIN 6907 washer
Type C
(7)
h d2
max min »  
M2.5 0.9 4 1.2 5.5
M3 1 4 1.2 6
(M3.5) 1.2 6 1.5 7
M4 1.4 6 1.5 8
M5 1.6 6 1.8 9
M6 2 8 2.1 11
M8 2.5 10 2.4 14
M10 3 12 2.7 18
Use of the size give in brackets should be avoided where possible. 1) / 2min is the smallest effective screw length manufacturable.
See relevant product standards for specifications for /.

Screw and washer assemblies

  • Coarse threaded Screws with captive curved spring lock washer
  • DIN6900
  • Examples of screw and washer assemblies
  • Table 1. DIMENSIONS
katsuhanan-SEMS(TAPPING)_SCREW

Figure 1. Assembly with screw threaded approximately up to the head.

katsuhanan-SEMS(TAPPING)_SCREW

Figure 2. Assembly with screw unthreaded portion of shank.

Thread size

(d)

a / 2" Washer dimensions
DIN 6907 washer
Type C
(9)
h d2
max min max  
M2.5 0.9 4 0.72 6
M3 1 4 0.85 7
(M3.5) 1.2 6 1.06 8
M4 1.4 6 1.3 9
M5 1.6 6 1.55 11
M6 2 8 2 14
M8 2.5 10 2.6 18
M10 3 12 3.2 23
M12 3.5 14 3.95 29
Use of the size give in brackets should be avoided where possible. 1) / 2min is the smallest effective screw length manufacturable .
See relevant product standards for specifications for /.

Tapping screw and washer assemblies

  • DIN6901
  • Type C (with cone point)
  • Type F (with blunt end)
  • Table 1. Dimensions
katsuhanan-SEMS(TAPPING)_SCREW

Figure 1. Assembly with screw threaded approximately up to the head.

katsuhanan-SEMS(TAPPING)_SCREW

Figure 2. Assembly with screw unthreaded portion of shank.

Thread size / 1 " a Washer dimensions
DIN 6903 curved spring lock washer
Type A(1) Type B(2)
min max h d2 h d2
ST2.9 5.5 1.1 1 7 1 9
ST3.5 8.5 1.3 1 8 1 11
(ST3.9) 8.5 1.3 1 9 1 12
ST4.2 8.5 1.4 1 9 1 12
ST4.8 11.4 1.6 1 10 1.6 15
ST5.5 11.4 1.8 1.6 12 1.6 15
ST6.3 11.4 1.8 1.6 14 1.6 18
(ST8) 14 2.1 1.6 16 2 24
1) / 2min is the smallest effective screw length manufacturable. Use of the size give in brackets should be avoided where possible.