Our Products

Home Our Products RSS™ LTF Timber Frame Fastener

RSS™ LTF Timber Frame Fastener

-- patented --

Star drive #30 applies approximately 650 lbf torque energy

Patented washer type head
Produces extreme pressure pulling the log down, eliminating the need to add a washer as required for common lag screws. Head can be countersunk 1"-3" without pre-drilling a countersink hole.

reinforced shoulder

Case hardened steel
Climatek™ coating, ACQ Approved.
Lifetime limited warranty.

"CEE" thread
Exclusive "CEE" thread slightly enlarges hole for screw shank and allows log to settle without restriction.
Eliminates pre-drilling as required for the common lag screw.
Complete and effective installation in one operation

4" thread
Very sharp deep rolled threads, provide extreme pulling and withdrawal power.

patented W-Cut™
Slices groove for next thread, reducing tension and pressure on fastener, providing ease of installation

ZipTip™
For quick and easy starting.

RSS™ Technical Data

GRK Fasteners utilizes strict quality control procedures. Every batch of screws produced is independently random sampled and quality controlled to the highest standards.

Accreditations for independent test laboratories include:
ICC, CNLA, TÜV, Ü, ISO, DAR.

TABLE 1 – RSS™ FASTENER SPECIFICATIONS
Fas. Desig.	Over-all Len.1 (in.)	Len. of Thread2 (in.)	Minor Thread Diam.3 (in.)	Shank Diam.3 (in.)	Out-side Thread Diam.3 (in.)	Steel Strength
						Bending Yield Str.4 Fyb(psi)	Tensile (lbf) [psi]	Shear (lbf) [psi]
RSS™
1/4 x 2"1/2	2 3/8	1 1/2	0.150	0.169	0.239	170,427	3,336 [188,301]	2,264 [127,792]
1/4 x 2"3/4	2 3/4	1 3/4
1/4 x 3"1/8	3 1/8	2
1/4 x 3"1/2	3 1/2	2 3/8
5/16 x 2"1/2	2 3/8	1 1/2	0.174	0.199	0.280	190,920	4,247 [178,051]	2,948 [123,592]
5/16 x 2"3/4	2 3/4	1 3/4
5/16 x 3"1/8	3 1/8	2 1/8
5/16 x 3"1/2	3 1/2	2 1/2
5/16 x 4"	3 7/8	2 3/4
5/16 x 5"1/8	5	3 1/2
5/16 x 6"	5 7/8	3 7/8
3/8 x 3"1/8	3 1/8	2 1/8	0.191	0.223	0.310	178,080	5,824 [203,809]	3,695 [129,305]
3/8 x 4"	3 7/8	2 3/4
3/8 x 5"1/8	5 1/8	3 1/2
3/8 x 6"	5 7/8	4
3/8 x 7"1/4	7	4 1/2
3/8 x 8"	7 7/8	4 3/8
3/8 x 10"	9 3/4	5
3/8 x 12"	11 7/8	5 7/8
3/8 x 14"1/8	14 1/8	5 7/8
3/8 x 16"	15 5/8	5 3/4
RSS™ LPS
1/4 x 6"	5 7/8	2 7/8	0.152	0.172	0.238	172,620	3,155 [172,950]	2,000 [109,635]
1/4 x 8"	7 7/8	2 7/8
1/4 x 9"	9	2 7/8
1/4 x 10"	9 7/8	2 7/8
1/4 x 11"	10 7/8	2 7/8
1/4 x 12"	11 3/4	2 7/8
1/4 x 14"	13 7/8	2 7/8
RSS™ LTF
3/8 x 8"	7 7/8	3 7/8	0.191	0.220	0.310	167,580	5,144 [179,350]	3,284 [114,525]
3/8 x 10"	9 7/8	3 7/8
3/8 x 12"	11 3/4	3 7/8
3/8 x 15"	14 3/4	3 7/8
3/8 x 18"	18	3 7/8
3/8 x 20"	19 5/8	3 7/8
PHEinox RSS™
1/4 x 2"1/2	2 3/8	1 1/2	0.152	0.170	0.237	111,460	1,886 [103,799]	1,640 [90,260]
1/4 x 3"1/8	3 1/8	2
5/16 x 2"1/2	2 3/8	1 5/8	0.171	0.195	0.276	118,360	2,419 [104,767]	2,006 [86,880]
5/16 x 3"1/8	3 1/8	2 1/8
5/16 x 4"	3 7/8	2 1/2
5/16 x 5"1/8	5 1/8	3 3/8
5/16 x 6"	5 7/8	3 7/8
RSS™ JTS
1/4 x 3"3/8	3 3/8	1 3/8	0.153	0.173	0.240	226,373	3,312 [180,999]	2,308 [126,131]
1/4 x 5"	5	1 5/8
1/4 x 6"3/4	6 3/4	1 1/2
for S1: 1 inch = 25.4 mm; 1 psi = 6.9 kPa. ULTIMATE LOAD VALUES Tensile and Shear 1 Overall length of fastener is measured from the underside of the head to bottom of the tip. See Figure 1. 2 Length of thread includes tip. See detailed illustration, Figure 1. 3 Minor thread, shank and outside thread diameters are shown in table without manufacturing tolerances. 4 Bending yield strength determined in accordance with ASTM D 1575 using the minor thread diameter.

FIGURE 1 – RSS™ FASTENER DIMENSIONS

TABLE 2 – RSS™ FASTENER WITHDRAWAL AND PULL-THROUGH
		RSS™ ULTIMATE WITHDRAWAL VALUES(W) [Withdrawal Values(W) are in Pounds per Inch of Thread Penetration into Side Grain of Main Member]	RSS™ ULTIMATE PULL-THROUGH VALUES(P) [Pull-Through Values(P) are in Pounds per Inch of Side Member Thickness]
Fastener Designation and Diameter Ø		Withdrawal, W (lbs./in.) For Specific Gravities Of: 0.55	Pull-Through, P (lbs./in.) For Specific Gravities Of: 0.55
RSS™	Ø 1/4	932	1840
	Ø 5/16	1136	2697
	Ø 3/8	1293	2332
RSS™ LPS	Ø 1/4	1006	2643
RSS™ LTF	Ø 3/8	1082	2493
PHE RSS™	Ø 1/4	936	2085
	Ø 5/16	1012	1702
RSS™ JTS	Ø 1/4	954	2443
		For S1: 1 inch = 25.4 mm; 1lbf/in = 175.127 N/m. 1Fastener withdrawal was tested in accordance with ASTM D 1761. 2Withdrawal values (W) shall be multiplied by the length of thread penetration in the main member (including tip).	For S1: 1 inch = 25.4 mm; 1lbf/in = 175.127 N/m. 1Fastener pull-through testing was performed in accordance with ASTM D 1037 with 3/4" thick side members.
		These figures are only offered as a guide and are not reduced by any safety factor. For safety factor requirements in your area, contact your local building official, architect or engineer.

TABLE 3 – RSS™ ULTIMATE LATERAL VALUES(Z) FOR SINGLE SHEAR (TWO-MEMBER) CONNECTIONS [For Sawn Lumber or SCL with both Members of Identical Specific Gravity]
Fastener Designation		Side Member Thickness ts (inches):	Fastener Penetration p (inches):	Ultimate Lateral Value, Z (pounds) For Specific Gravities Of:
				0.55
				Parallel To Grain, Z‖	Perpendicular to Grain, Z⊥
RSS™	1/4 x 2"1/2	3/4	1 5/8	876	875
	1/4 x 2"3/4	3/4	2
	1/4 x 3"1/8	3/4	2 3/8
	1/4 x 3"1/2	3/4	2 3/4
	5/16 x 2"1/2	3/4	1 5/8	1068	916
	5/16 x 2"3/4	3/4	2	1088	890
	5/16 x 3"1/8	3/4	2 3/8
	5/16 x 3"1/2	3/4	2 3/4
	5/16 x 4"	1 1/2	2 3/8	1667	1417
	5/16 x 5"1/8	1 1/2	3 1/2	1857	1286
	5/16 x 6"	2	3 7/8	2360	1446
	3/8 x 3"1/8	3/4	2 3/8	1253	1098
	3/8 x 4"	1 1/2	2 3/8	1443	1454
	3/8 x 5"1/8	1 1/2	3 5/8	1369	1321
	3/8 x 6"	2	3 7/8	1625	1440
	3/8 x 7"1/4	2 3/4	4 1/4	2964	1518
	3/8 x 8"	3 1/2	4 3/8
	3/8 x 10"	3 1/2	6 1/4
	3/8 x 12"	3 1/2	8 3/8
	3/8 x 14"1/8	3 1/2	10 5/8
	3/8 x 16"	3 1/2	12 1/8
RSS™ LPS	1/4 x 6"	3	2 7/8	1789	1093
	1/4 x 8"	5	2 7/8
	1/4 x 9"	6	3
	1/4 x 10"	7	2 7/8
	1/4 x 11"	8	2 7/8
	1/4 x 12"	9	2 3/4
	1/4 x 14"	11	2 7/8
RSS™ LTF	3/8 x 8"	4	3 7/8	2779	2008
	3/8 x 10"	6	3 7/8
	3/8 x 12"	8	3 3/4
	3/8 x 15"	11	3 3/4
	3/8 x 18"	14	4
	3/8 x 20"	16	3 5/8
PHEINOX RSS™	1/4 x 2"1/2	3/4	1 5/8	1077	925
	1/4 x 3"1/8	3/4	2 3/8
	5/16 x 2"1/2	3/4	1 5/8	906	873
	5/16 x 3"1/8	3/4	2 3/8
	5/16 x 4"	1 1/2	2 3/8	1884	1361
	5/16 x 5"1/8	1 1/2	3 5/8
	5/16 x 6"	2	3 7/8	2246	1791
JTS	1/4 x 3"3/8	1 3/4	1 5/8	830	983
	1/4 x 5"	1 3/4	3 1/4	1203	1184
	1/4 x 6"3/4	1 3/4	5
for S1: 1 inch = 25.4 mm 1 Lateral load testing was performed in accordance with ASTM D 1761. These figures are only offered as a guide and are not reduced by any safety factor. For safety factor requirements in your area, contact your local building official, architect or engineer.

View Price List
View Selection Guide
Download This Catalog Page