Products

DIN EN ISO 7089 (DIN 125 A):

Flat washers –
Normal series, product category A

DIN EN ISO 7090 (DIN 125 B):

Flat washers with chamfer –
Normal series, product category A

DIN EN ISO 7091 (DIN 126):

Flat washers –
Normal series, product category A

DIN EN ISO 7092 (DIN 433-1):

Flat washers –
small series, product category A

DIN 436:

Washers, square, primarily use for wood constructions

DIN 1440:
Washers, medium, for bolts

DIN 1441:

Washers, coarse, for bolts

DIN 6319:
Spherical washers – conical seats

DIN 6340:

Washers for clamping devices

EN 14399-6 (DIN 6916):

Flat washers with chamfer

DIN 7349:
Washers for bolts with heavy clamping sleeves

DIN 7989-1:

Washers for steel constructions –
Part 1: Product category C

DIN 7989-2:

Washers for steel constructions –
Part 2: Product category A

DIN EN ISO 7093-1 (DIN 9021):

Flat washers – large series – Part 1: Product category A

DIN EN ISO 7093-2 (DIN 9021):

Flat washers – large series – Part 2: Product category C

The geometric shape of washers is a cylindrical shape. The radius of the outer diametre is significantly larger than the thickness of the washer. Washers having a wall thickness which is many times thinner than the center hole are in general referred to as a ring. However, there is no clear definition in view of the different terms such as cylinder, washer, plate, ring or similar descriptions and is mostly depending on the context.

Various types of washers are available:

• plain washers without hole
• Washers with holes: concentrical (center) holes or coaxial (offset) holes
• Washers are mainly used in fastening technology

Production methods:
Washers can be manufactured in different ways:

• Machining
• Stamping
• Laser cutting
• Water jet cutting

DIN EN 22340 (ISO 2340) (DIN 1443):
Bolts without head

DIN EN 22341 (ISO 2341) (DIN 1444):
Bolts with head

DIN 1445:
Bolts with head and threading pin

DIN EN ISO 2338 (DIN 7)
(DIN EN 22338):
Cylindrical pins made of unhardened steel
and austenitic corrosion resistant steel

DIN EN ISO 8733 (DIN 7979)
(DIN EN 28733):
Cylindrical pins with inner thread made of
unhardened steel and austenitic corrosion resistant steel

DIN EN ISO 8734 (DIN 6325)
(DIN EN ISO 8734):
Cylindrical pins made of hardened steel and
martensitic corrosion resistant steel

DIN EN ISO 8735 (DIN 7979)
(DIN EN 28735):
Cylindrical pins with inner thread made of hardened steel and martensitic corrosion resistant steel

As a machine element a bolt is a short cylindrical fastener.
Unlike a pin a bolt can be dismantled easily, i.e. used with clearance fit. It is mainly applied for cases with transverse loadings (shear). It’s additional shape elements such as head, transverse hole (for splints), short thread (for nuts) or crosswise slot (for axle support) help avoiding a loss through form closure between the bolt and the parts to be connected with.

Bolts are often used instead of screws for connections which need to be unfastened quickly and frequently for example in the transportation sector for the fixing of containers, for the closing of loading platforms of trucks or similar.

Bolt connections are basically rotatable and can therefore be part of a swivel joint, f.ex. Bolts are standardised according to EN 22340 (without head) and EN 22341 (with head) and additionally in Germany acc. to DIN 1445 (with head and threaded end).

Production methods:
Bolts can be manufactured in different ways:

• Machining
• Forming technology

Bushings and sleeves are often used in the fastening technology.

A distance bushing, a distance sleeve or a distance tube is always used when it is necessary to create a distance (space) between two components or in order to fill a certain space. It will be referred to a distance sleeve, distance tube or small tube for parts with tubular shape.

Production methods:
Bushings, sleeves can be manufactured in different ways:

• Machining
• Forming technology