Asia Bolts & Nuts (MFG) Sdn.Bhd.
 We are proud to have associated with:
KLIA - Kuala Lumpur International Air Port
 
 

Terminology on topics related to;
nuts and bolts, threaded fasteners and tightening techniques

SEMS
A screw and washer assembly. A screw or bolt which has a captive washer. The washer is frequently loose on the plain shank of the fastener, the shank diameter being equal to the effective diameter of the thread; the thread being rolled from this diameter. The origin of the word is a frequent question. In the 1930's E. C.

Crowther was a representative for a company that sold both shakeproof washers and screws. He came up with the idea of placing the washer on the screw before it was thread rolled. The major diameter of the screw being larger than the washer hole prevents it from coming off. The Illinois Tool Works made machines that produced these patented pre-asSEMbled washers and screws.
 
 
The s at the end of SEMs is thought to have been subsequently picked up because they are not usually purchased individually. In spite of the original patents and trademarks the word SEMS is generally recognised as a generic term applicable to screw and washer assemblies.

SYMMETRICAL THREAD - Symmetrical thread has both flanks of the thread profile inclined at the same angle.


TENSION WASHERS
A general name given to spring washers, curved washers, Belleville washers and disc springs.

This type of washer provides a relatively low stiffness (compared to the joint stiffness) and can be used to act as a spring take-up with a bolt to prevent movement between parts.

THREAD CREST
The top part of the thread. For external threads, the crest is the region of the thread which is on it's outer surface, for internal threads it is the region which forms the inner diameter.


TAYLOR-FORGE METHOD - A method developed by four engineers of the Taylor-Forge Company in Chicago in the 1930's that subsequently formed the basis of the ASME code for flanged joint design. The assumptions made by the method are now generally regarded as too simplistic. This method gives rise to the m and y gasket factors.

THREAD FLANK - The thread flanks join the thread roots to the crest.


Can't find what you need?
Try Google....

Google

Home   About Us   Site Contents   Export Product Info   Experience   Manufacturing

Production Capacity Our monthly production capacity is presently up to 200 Metric Tons. Our proposed new plant will be operating by the year of 2001 at Nilai Industrial Park with a total area of three acres. Studs & Anchor bolts Stainless Steel, High Tensile steel and Mild Steel Hex. bolts Special bolts and parts made to customer's drawing or samples Plow bolts, Carriage bolts, Square bolts and Rivets as well as many other Product Range

Material Stainless Steel Grade 316/304 Grade 4.6 / 5.6 / 6.8 / 8.8 / 10.9 / 12.9 Standard BS / Din / JIS / AS or any standard Various Type of Customized Requirement

Our factory manufactures standard and customized products in terms of types of fastener, usage, market available materials, quantity and quality requirement. Our equipment and capacity will be your best choice for bigger diameter products used in projects.  Products Range: Anchor Bolts-Type Hexagon Head Cap Screws Socket Head Cap Screws
Threaded Rods/Studs Sag Rods or Tie Rods Flat Head Socket Cap Screws Super-Bolts, T-Bolts U-Anchor /U-Bolts Couplers, Cast-in Anchorage