SSZS Screw Studded Inserts

General

Insert Thread	Insert Thread Code	L Insert Length	Insert Length Code	Boss Hole Dia. B		A Head Thickness	C Head Diameter	D Insert Diameter Max.
				Thermo– plastics +.004 -.000	Thermo– setting +.004 -.000
2-56	256	.236	236	.157-.161	.161-.169	.023	.236	.177
4-40	440	.236	236	.157-.161	.161-.169	.023	.236	.177
6-32	632	.315	315	.209-.213	.217-.224	.029	.295	.236
8-32	832	.315	315	.228-.232	.236-.244	.035	.312	.256
10-24	1024	.394	394	.280-.283	.287-.299	.042	.374	.315
10-32	1032	.394	394	.280-.283	.287-.299	.042	.374	.315
1/4-20	2520	.551	551	.339-.346	.354-.370	.052	.472	.394
1/4-28	2528	.551	551	.339-.346	.354-.370	.052	.472	.394
5/16-18	3118	.591	591	.417-.425	.433-.449	.052	.551	.472
5/16-24	3124	.591	591	.417-.425	.433-.449	.052	.551	.472
3/8-16	3716	.709	709	.496-.504	.512-.528	.062	.630	.551
3/8-24	3724	.709	709	.496-.504	.512-.528	.062	.630	.551
1/2-13	5013	.866	866	.575-.583	.591-.606	.062	.709	.630
1/2-20	5020	.866	866	.575-.583	.591-.606	.062	.709	.630

Stud Length

Stud Thread	Stud Thread Code	D Insert Diameter Max.	S-Stud Length
			.187	.250	.312	.375	.437	.500	.625	.750	.875	1.000
			Stud Length Code
2-56	256	.177	187	250	312	—	—	—	—	—	—	—
4-40	440	.177	187	250	312	375	437	—	—	—	—	—
6-32	632	.236	187	250	312	375	437	500	—	—	—	—
8-32	832	.256	187	250	312	375	437	500	625	—	—	—
10-24	1024	.315	187	250	312	375	437	500	625	750	—	—
10-32	1032	.315	187	250	312	375	437	500	625	750	—	—
1/4-20	2520	.394	—	250	312	375	437	500	625	750	875	1000
1/4-28	2528	.394	—	250	312	375	437	500	625	750	875	1000
5/16-18	3118	.472	—	—	312	375	437	500	625	750	875	1000
5/16-24	3124	.472	—	—	312	375	437	500	625	750	875	1000
3/8-16	3716	.551	—	—	—	375	437	500	625	750	875	1000
3/8-24	3724	.551	—	—	—	375	437	500	625	750	875	1000
1/2-13	5013	.630	—	—	—	—	—	500	625	750	875	1000
1/2-20	5020	.630	—	—	—	—	—	500	625	750	875	1000

Boss Design Recommendation

The SSZ Screw Zert is designed to be installed into a straight hole with a 1°inclusive taper. The recommended hole size applies at the point reached by the bottom of the insert. Molded holes should be used wherever possible as drilled holes may result in diminished performance. PENCOM recommends a 60°countersink, with a depth equal to the external thread pitch of the insert being used, at the top of the hole to prevent chipping of the surrounding boss hole surface. Hole diameters are dependant on the type of plastic being used with harder plastics requiring larger holes than softer plastics, for example. Diameter ranges shown in the tables are those recommended for thermoplastics and thermosetting plastics with the exact hole size determined through testing in the application.

Installation

The slot in the insert acts as a thread cutting edge. Inserts are installed following standard tapping procedures using hand tools or conventional tapping equipment.