13.座金組込ネジ (セムス)
製品
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*
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
Figure 1. Assembly with screw threaded approximately up to the head.
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
Figure 1. Assembly with screw threaded approximately up to the head.
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
Figure 1. Assembly with screw threaded approximately up to the head.
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
Figure 1. Assembly with screw threaded approximately up to the head.
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. | ||||||
