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HRS/ST/PS/HST/LSTA/LSTI/MST/MSTA/MSTC/MSTI
Strap Ties

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Straps are designed to transfer tension loads in a wide variety of applications.

HRS - A 12 gauge strap with a nailing pattern designed for installation on the edge of 2x members.

LSTA and MSTA - Designed for use on the edge of 2x members, with a nailing pattern that reduces the potential for splitting.

LSTI - Light straps that are suitable where pneumatic-nailing is necessary through diaphragm decking and wood chord open web trusses.

MST - Splitting may be a problem with installations on lumber smaller than 3 1/2"; either fill every nail hole with 10dx1 1/2" nails or fill every-other hole with 16d common nails. Reduce the allowable load based upon the size and quantity of fasteners used.

MSTC - High Capacity strap which utilizes a staggered nail pattern to help minimize wood splitting. Nail slots have been countersunk to provide a lower nail head profile.

Finish: PS - HDG; HST3 and HST6 - gray paint; all others - galvanized. Some products are available in stainless steel or ZMAX®; see Corrosion Information.

Installation: Use all specified fasteners. See General Notes.

Options: Special sizes can be made to order. Contact Simpson.

Codes: MSTC and RPS meet code requirements for reinforcing cut members (16 gauge) at top plate and RPS at sill plate.
International Residential Code®- 2000/2006 R602.6.1
International Building Code®- 2000/2006 2308.9.8

See RPS.


top Gallery:
MSTI        

  MST          

  LSTI        

  LSTA and MSTA       
(Pilot holes not shown)         

  ST        

  ST9, ST12, ST18, ST22        

         
 
  roll over images below to see larger image
 
ST2115 MSTC28 HST HRS
 
Typical MSTI Installation (MIT hanger shown)
LSTI similar
Typical LSTI Installation Typical HRS Installation  
 
  roll over images below to see larger image
 
Typical LSTA Installation (hanger not shown)
Bend strap one time only


 
PS   Typical PS720 Installation

See PSPC Strap Ties for loads
associated with PS straps.

 
  roll over images below to see larger image
 
Typical Detail with Strap Installed Over Sheathing
When nailing the strap over OSB/plywood, use a 2 1/2" long nail minimum
  Floor-to-Floor
Tie Installation showing a Clear Span

top Floor-to-Floor Clear Span Table
Table
  1. Loads include a 33% or 60% load duration increase on the fasteners for earthquake or wind loading, but DO NOT include a
    33% stress increase on the steel capacity. Refer to Steel Stress Increase for further explanation.
  2. 10dx1 1/2" nails may be substituted where 16d sinkers or 10d are specified at 100% of the table
    loads.
  3. 10d commons may be substituted where 16d sinkers are specified at 100% of table loads.
  4. 16d sinkers (0.148" dia x 3 1/4" long ) or 10d commons may be substituted where 16d commons are specified at 0.85 of the table loads.
  5. Use half of the nails in each member being connected to achieve the listed loads.
  6. PS strap design loads must be determined by the Designer for each installation. Bolts are installed both perpendicular
    and parallel-to-grain. Hole diameter in the part may be oversized to accommodate the HDG. Designer must determine if the
    oversize creates an unacceptable installation.
  7. For overlap splice details, see technical bulletin T-CMST.
  8. Straps with 10d (0.148 dia. x 3) nails specified may be substituted with 10dx1 1/2 (0.148 dia. x 1 1/2) with no reduction in load.
  9. Tension loads apply for uplift when installed vertically.
  10. NAILS: 16d = 0.162" dia. x 3 1/2" long, 16d Sinker = 0.148" dia. x 3 1/4" long, 10d = 0.148" dia. x 3" long,
    10dx1 1/2 = 0.148" dia. x 1 1/2" long. See other nail sizes and information.

top Load Table: See code report listings below

Table
  1. Loads include a 33% or 60% load duration increase on the fasteners for earthquake or wind loading, but DO NOT include a
    33% stress increase on the steel capacity. Refer to Steel Stress Increase for further explanation.
  2. 10d commons may be substituted where 16d sinkers are specified at 100% of the table loads.
  3. 16d sinkers (0.148" dia. x 3 1/4" long) or 10d commons may be substituted where 16d commons are specified at 0.85 of the table loads. 
  4. Allowable bolt loads are based on parallel-to-grain loading and these minimum member thicknesses: MST-2 1/2"; HST2 and
    HST5-4"; HST3 and HST6-4 1/2".
  5. Use half of the required nails in each member being connected to achieve the listed loads.
  6. For overlap splice details, refer to T-CMST.
  7. Straps not installed over sheathing with 10d (0.148 dia. x 3) nails specified may be substituted with 10dx1 1/2 (0.148 dia. x 1 1/2) with no reduction in load.
  8. Tension loads apply for uplift as well when installed vertically.
  9. NAILS: 16d = 0.162" dia. x 3 1/2" long, 16d Sinker = 0.148" dia. x 3 1/4" long, 10dx1 1/2 = 0.148" dia. x 1 1/2" long.
    See other nail sizes and information.

top Code Reports (PDFs):
Legacy Reports
  IAPMO ES ICC-ES ESR CITY OF LOS ANGELES STATE OF FLORIDA ICC-ES NER ICC-ES ER ICC-ES ES
HRSSee specific model numbers for code listings.
HRS12      FL1901 / FL9601      
HRS6      FL1901 / FL9601      
HRS8      FL1901 / FL9601      
HSTSee specific model numbers for code listings.
HSTSee specific model numbers for code listings.
HST2  ESR-2105 / ESR-2523 RR25119 / RR25713 FL474 NER-413 ER-5672  
HST3  ESR-2105 / ESR-2523 RR25119 / RR25713 FL474 NER-413 ER-5672  
HST5  ESR-2105 / ESR-2523 RR25119 / RR25713 FL474 NER-413 ER-5672  
HST5-4 No code listing. Please contact us for test data.
HST6  ESR-2105 / ESR-2523 RR25119 / RR25713 FL474 NER-413 ER-5672  
HST6-41/2 No code listing. Please contact us for test data.
LSTASee specific model numbers for code listings.
LSTA12  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA15  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA18  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA21  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA24  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA30  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA36  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTA9  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
LSTISee specific model numbers for code listings.
LSTI49  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499    
LSTI73  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499    
MSTSee specific model numbers for code listings.
MSTSee specific model numbers for code listings.
MST21/2 No code listing. Please contact us for test data.
MST27  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 NER-413 ER-5672  
MST37  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 NER-413 ER-5672  
MST48  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 NER-413 ER-5672  
MST60  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 NER-413 ER-5672  
MST72  ESR-2105 / ESR-2523 RR25713 FL1901 NER-413    
MSTASee specific model numbers for code listings.
MSTA12  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA12SS  ESR-2105 / ESR-2523 RR25713 FL1901      
MSTA12Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA15  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA15Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA18  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA18SS  ESR-2105 / ESR-2523 RR25713 FL1901      
MSTA18Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA21  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA21Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA24  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA24SS No code listing. Please contact us for test data.
MSTA24Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA30  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA30Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA36  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTA36SS No code listing. Please contact us for test data.
MSTA36Z  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 NER-443   ES-9603C
MSTA49 No code listing. Please contact us for test data.
MSTA9  ESR-2105 / ESR-2523 RR25149 / RR25713 FL1901 / FL9601 NER-443   ES-9603C
MSTAM24Z      FL1901      
MSTAM36ZNo code listing: Please contact us for test data.
MSTCSee specific model numbers for code listings.
MSTCSee specific model numbers for code listings.
MSTC28  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC28  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC40  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC40  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC52  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC52  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC66  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC66  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC78  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTC78  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-499 ER-4935  
MSTISee specific model numbers for code listings.
MSTISee specific model numbers for code listings.
MSTI26  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI36  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI36  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI48  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI48  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI60  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI60  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI72  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-413 ER-5672  
MSTI72  ESR-2105 / ESR-2523 RR25713 FL1901 / FL9601 NER-413 ER-5672  
PSSee specific model numbers for code listings.
PS218No load capacity: Products not submitted because they are not load rated and code approval is not required.
PS418No load capacity: Products not submitted because they are not load rated and code approval is not required.
PS720No load capacity: Products not submitted because they are not load rated and code approval is not required.
STSee specific model numbers for code listings.
ST12  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
ST18  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
ST2115  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 / FL9601 NER-413 ER-5275 / ER-5672  
ST2122  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 / FL9601 NER-413 ER-5275 / ER-5672  
ST22  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  
ST2215  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 / FL9601 NER-413 ER-5275 / ER-5672  
ST292  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 / FL9601 NER-413 ER-5275 / ER-5672  
ST6215  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 / FL9601 NER-413 ER-5275 / ER-5672  
ST6224  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 / FL9601 NER-413 ER-5275 / ER-5672  
ST6236  ESR-2105 / ESR-2523 RR25119 / RR25489 / RR25713 FL1901 NER-413 ER-5275 / ER-5672  
ST9  ESR-2105 / ESR-2523 RR25119 / RR25713 FL1901 / FL9601 NER-413 ER-5672  

   
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