Our Products
ตัวแทนจำหน่ายผลิตภัณฑ์
Facebook Fanpage
Tags Cloud
Our customers list
Visitors Counter
กำลังใช้งานขณะนี้
มี 26 ผู้มาเยือน และ ไม่มีสมาชิกออนไลน์ ออนไลน์
Sem Screws
|
|
| Sem Screws |
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*
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
 |
 |
Figure 1. Assembly with screw threaded Figure 2. Assembly with screw
approximately up to the head. 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 Figure 2. Assembly with screw
approximately up to the head. 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. |
||||||
