SO-8 PennEngineering • www.pemnet.com

SELF-CLINCHING STANDOFFS

Threads (1)

Fastener Materials

Standard Finishes

Optional Finish

For Use In Sheet Hardness: (4)

Internal, ASME

Non-heat

300

Hardened

Zinc Plated

Passivated

Electroless Nickel

B1.1, 2B

Hardened

Treated

Series

400 Series

per ASTM B633,

and/or Tested

over Copper over

HRB 88 /

HRB 80 /

HRB 70 /

HRB 60 /

HRB 50 /

Type

ASME

Carbon

Carbon

Aluminum

Stainless

Stainless Steel SC1 (5µm), Type III

Per ASTM

No

Nickel Strike

HB 183

HB 150

HB 125

HB 107

HB 89

B1.13M, 6H

Steel

Steel

Steel

(5)

Colorless (2)

A380

Finish

Per ASTM B733 (2) (3)

or Less

or Less

or Less

or Less

or Less

SO

•

•

•

•

SOA

•

•

•

•

SOS

•

•

•

•

SO4

•

•

•

•

•

BSO

•

•

•

•

BSOA

•

•

•

•

BSOS

•

•

•

•

BSO4

•

•

•

•

•

TSO

•

•

•

•

TSOS

•

•

•

•

TSOA

•

•

•

•

TSO4

•

•

•

•

•

DSO

•

•

•

•

DSOS

•

•

•

•

SOAG

•

•

•

•

SOSG

•

•

•

•

Part Number Codes For Finishes

ZI

None

None

NC

SO™/SOS™/SOA™/SO4™/BSO™/BSOS™/BSOA™/BSO4™ STANDOFFS

1. Prepare properly sized mounting hole in sheet. Do not perform any

secondary operation such as deburring.

2. Insert standoff through mounting hole (preferably the punch side) of

sheet and into anvil as shown in drawing.

3. With installation punch and anvil surfaces parallel, apply only enough

squeezing force to embed the standoff’s head flush in the sheet.

Drawing at right shows suggested tooling for applying these forces.

C*

L* Min.

PUNCH

+.004” to +.007” /

+0.1 mm to +0.18 mm

ANVIL

INSTALLATION

(1) Where applicable.

(2) See PEM Technical Support section of our website for related plating standards and specifications.

(3) Not stocked, available on special order. Minimum quantities apply. Contact your local PEM® distributor for details.

(4) HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.

(5) In order for self-clinching fasteners to work properly, the fastener must be harder than the sheet into which it is being installed (For more

information, see our tech sheet for installing fasteners into stainless steel sheets). In the case of stainless steel panels, fasteners made from 300

Series Stainless Steel do not meet this hardness criteria.  It is for this reason that SO4™, BSO4™ and TSO4™ 400 series fasteners are offered. 

However, while these 400 Series fasteners install and perform well in 300 Series stainless sheets they should not be used if the end product will

be exposed to any appreciable corrosive environment (unless finished with optional nickel plating), requires non-magnetic fasteners or will be

exposed to any temperatures above 300˚F (149˚C). If any of the these are issues, please contact techsupport@pemnet.com for other options.

MATERIAL AND FINISH SPECIFICATIONS

Thread

Anvil Part

Punch Part

Code

Number

Number

440/M2/M2.5/M3

970200487300

632/6440/3.5M3/M3.5

970200012300

832/8632/M4

970200013300

975200048

032/M5

970200013300

0420/M6

970200393300

PEMSERTER® Installation Tooling

*See pages 3 & 4

for “C” and “L”.