Direct Bolt & Supply Fastener Technical Information

Nord-Lock Product Info

The Junker vibration test, according to DIN 65151, is considered the most severe vibration test for bolted connections. In this video we compare the performance of Nord-Lock washers with other locking methods. Nord-Lock wedge lock washers prevents bolts loosening by securing bolted joints with tension instead of friction.

In recent years, the market of bolt securing has changed. Copies of Nord-Lock washers are now produced in every part of the world. Most are of poor quality, whereas some may look very similar to the naked eye. When original safety products are replaced with copies it can have catastrophic consequences.

Fastener Technical Info

NOTE CONCERNING B7M Grade Fasteners

The final heat treatment shall be done after ALL MACHINING and FORMING OPERATIONS, THREADING OR CUTTING of the fastener.

A General Guide to the Room Temperature Tensile Strength of Common Fastener Alloys*

Carbon steels

100,000 psi to 175,000 psi

Often used for nuts

Alloy steels

100,000 psi to 180,000 psi

Used for bolts and screws

Tool steel (H-11)

Up to 260,000 psi

High strength fasteners

Austenitic stainless steels (300 series)

75,000 psi (carbide solution treated)

100,000 psi to 125,000 psi (strain hard)

Corrosion resistant fasteners

Martensitic stainless steels

(400 series)

90,000 psi to 140,000 psi

Less corrosion resistance than 300 series

Precipitation hardenable (PH) stainless steels

(17-4PH, A286)

80,000 psi to 180,000 psi

Corrosion resistance similar to 300 series stainless

PH Nickel based alloys

(Inconel 718, Inconel X750, Waspaloy)

140,000 psi to 180,000 psi
225,000 psi (hardened)

Superior corrosion resistance, elevated temperature strength

Non-HT Nickel based alloys

(Alloy 20, Inconel 600, Inconel 625, Inconel 686)

80,000 psi to 120,000 psi (annealed)

Up to 180,000 psi (strain hardened)

Corrosion resistance in severe environments

Nickel-Copper alloy

(Monel 400)

80,000 psi

Corrosion resistance in a variety of environments including seawater

Nickel-Copper-Aluminum alloy

(K-500)

160,000 psi

Corrosion resistance in a variety of environments including seawater

Cobalt based alloys

(MP35N, MP159)

Up to 260,000 psi

Superior corrosion resistance

Titanium alloys

(commercially pure;

alpha-beta alloys)

35,000 psi to 80,000 psi (annealed)

140,000 psi to 190,000 psi (hardened)

Light weight, excellent corrosion resistance

Copper based alloys

30,000 psi to 70,000 psi

Electrical conductivity, heat transfer, corrosion resistance